Mercurial > vba-clojure

     1 (ns com.aurellem.gb.assembly

     2   (:use (com.aurellem.gb gb-driver vbm util items))

     3   (:import [com.aurellem.gb.gb_driver SaveState]))

     4 

     5 (defn inject-assembly

     6   ([^SaveState state

     7    program-counter registers

     8    assembly-code]

     9   (let [scratch-memory (memory state)]

    10     ;; inject assembly code

    11     (dorun (map (fn [index val]

    12                   (aset scratch-memory index val))

    13                 (range program-counter

    14                        (+ program-counter (count assembly-code)))

    15                 assembly-code))

    16     (-> state

    17         (write-memory! scratch-memory)

    18         (write-registers! registers)

    19         (PC! program-counter)))))

    20 

    21 (defn inject-item-assembly

    22   ([^SaveState state assembly-code]

    23      (inject-assembly state (inc item-list-start)

    24                       (registers state)

    25                       assembly-code))

    26   ([assembly-code]

    27      (inject-item-assembly @current-state assembly-code)))

    28 

    29 (defn run-assembly

    30   ([info-fn assembly n]

    31      (let [final-state

    32            (reduce (fn [state _]

    33                      (tick (info-fn state)))

    34                    (inject-item-assembly

    35                      (mid-game) assembly)

    36                    (range n))]

    37        final-state))

    38   ([assembly n]

    39      (run-assembly d-tick assembly n)))

    40 

    41 (def buttons-port 0xFF00)

    42 

    43 (defn trace [state]

    44   (loop [program-counters [(first (registers @current-state)) ]

    45          opcodes [(aget (memory @current-state) (PC @current-state))]]

    46     (let [frame-boundary?

    47           (com.aurellem.gb.Gb/tick)]

    48       (if frame-boundary?

    49         [program-counters opcodes]

    50         (recur

    51          (conj program-counters

    52                (first (registers @current-state)))

    53          (conj opcodes

    54                (aget (memory @current-state)

    55                      (PC @current-state))))))))

    56 

    57 (defn print-trace [state n]

    58   (let [[program-counters opcodes] (trace state)]

    59     (dorun (map (fn [pc op] (println (format "%04X: 0x%02X" pc op)))

    60                 (take n program-counters)

    61                 (take n opcodes)))))

    62 

    63 (defn good-trace []

    64   (-> (mid-game) (tick) (IE! 0)

    65       (set-inv-mem [0x00 0x00 0X00 0x00])

    66       (PC! item-list-start)(print-interrupt)

    67       (d-tick) (tick) (d-tick) (tick) (d-tick)))

    68 

    69 (defn read-down-button []

    70   (-> (tick (mid-game))

    71       (IE! 0) ; disable interrupts

    72       (inject-item-assembly

    73        ;; write 00010000 to 0xFF00 to select joypad

    74        [0x18   ;D31D                    ; jump over          

    75         0x01   ;D31E                    ; the next 8 bits

    76                                         ;D31F

    77         (Integer/parseInt "00100000" 2) ; data section 

    78         

    79         0xFA   ;D320                    ; load (D31F) into A

    80         0x1F   ;D321      -->       

    81         0xD3   ;D322      -->  D31F     

    82 

    83         0xEA   ;D323                    ; load (A), which is 

    84         0x00   ;D324      -->           ; 00010000, into FF00

    85         0xFF   ;D325      -->  FF00     

    86         

    87         0x18   ;D326                    ; this is the place where

    88         0x01   ;D327                    ; we will store whether

    89         0x00   ;D328                    ; "down" is pressed.

    90 

    91         0xFA   ;D329                    ; (FF00) -> A

    92         0x00   ;D32A                   

    93         0xFF   ;D32B

    94 

    95         0xCB   ;D32C                    ; Test whether "down"

    96         0x5F   ;D32D                    ; is pressed.

    97 

    98         0x28   ;D32E                    ; if down is pressed,

    99         0x03   ;D32F                    ; skip the next section 

   100                                         ; of code.

   101         ;; down-is-not-pressed

   102         0xC3   ;D330

   103         0x1D   ;D331                    ; return to beginning

   104         0xD3   ;D332

   105         

   106         ;; down-is-pressed 

   107         0xEA   ;D334                    ; write A to D328 if 

   108         0x28   ;D335                    ; "down" was pressed

   109         0xD3   ;D336

   110 

   111         0xC3   ;D330

   112         0x1D   ;D331                    ; return to beginning

   113         0xD3   ;D332

   114         ])))

   115 

   116 (defn test-read-down []

   117  (= (view-memory (step (step (read-down-button) [:d])) 0xD328)

   118     (view-memory (step (step (read-down-button))) 0xD328)))

   119 

   120 (defn count-frames []

   121   (-> (tick (mid-game))

   122       (IE! 0) ; disable interrupts

   123       (inject-item-assembly

   124        [0x18   ;D31D                    ; jump over          

   125         0x02   ;D31E                    ; the next 2 bytes

   126         0x00   ;D31F                    ; frame-count

   127         0x00   ;D320                    ; v-blank-prev

   128         

   129         0xFA   ;D321

   130         0x41   ;D322                    ; load (FF41) into A

   131         0xFF   ;D323                    ; this contains mode flags

   132         

   133         ;; if we're in v-blank, the bit-1 is 0

   134         ;; and bit-2 is 1  Otherwise, it is not v-blank.

   135         0xCB   ;D324                     ; test bit-1 of A

   136         0x4F   ;D325                         

   137 

   138         0xC2   ;D326                     ; if bit-1 is not 0

   139         0x44   ;D327                     ; GOTO not-v-blank

   140         0xD3   ;D328

   141         

   142         0xCB   ;D329                     ; test bit-0 of A 

   143         0x47   ;D32A

   144 

   145         0xCA   ;D32B                     ; if bit-0 is not 1

   146         0x44   ;D32C                     ; GOTO not-v-blank

   147         0xD3   ;D32D

   148         ;;; in v-blank mode

   149            ;; if v-blank-prev was 0,

   150            ;; increment frame-count

   151 

   152         0xFA   ;D32E                    ; load v-blank-prev to A

   153         0x20   ;D32F

   154         0xD3   ;D330

   155         

   156         0xCB   ;D331

   157         0x47   ;D332                    ; test bit-0 of A 

   158 

   159         0x20   ;D333                    ; skip next section

   160         0x07   ;D334                    ; if v-blank-prev was not zero 

   161         

   162            ;; v-blank was 0, increment frame-count

   163         0xFA   ;D335                    ; load frame-count into A

   164         0x1F   ;D336

   165         0xD3   ;D337                   

   166 

   167         0x3C   ;D338                    ; inc A

   168 

   169         0xEA   ;D339                    ; load A into frame-count

   170         0x1F   ;D33A

   171         0xD3   ;D33B

   172 

   173            ;; set v-blank-prev to 1

   174         0x3E   ;D33C                    ; load 1 into A

   175         0x01   ;D33D                    

   176 

   177         0xEA   ;D33E                    ; load A into v-blank-prev

   178         0x20   ;D33F

   179         0xD3   ;D340

   180 

   181         0xC3   ;D341                   ; return to beginning

   182         0x1D   ;D342

   183         0xD3   ;D343

   184 

   185         ;;; not in v-blank mode

   186            ;; set v-blank-prev to 0

   187         0x3E   ;D344                    ; load 0 into A        

   188         0x00   ;D345

   189 

   190         0xEA   ;D346                    ; load A into v-blank-prev

   191         0x20   ;D347

   192         0xD3   ;D348

   193 

   194         0xC3   ;D349                   ; return to beginning

   195         0x1D   ;D34A

   196         0xD3   ;D34B

   197         ])))

   198 

   199 (defn step-count-frames []

   200   (-> (read-down-button)

   201       (d-tick)

   202       (tick)  ;; skip over data section

   203       (d-tick)  

   204       (view-register "Register A" A)

   205       (tick)  ;; load-data into A

   206       (view-register "Register A" A)

   207       (d-tick)

   208       (view-memory 0xFF00)

   209       (tick) ;; load A into 0xFF00

   210       (view-memory 0xFF00)

   211       (d-tick)

   212       (tick)

   213       (d-tick)

   214       (tick)

   215       (d-tick)

   216       (tick)

   217       (d-tick)

   218       (tick)

   219       (d-tick)

   220       (tick)

   221       (d-tick)

   222       (tick)

   223       (print-inventory)))

   224 

   225 (defn test-count-frames []

   226   (= 255 (aget (memory ((apply comp (repeat 255 step))

   227                         (count-frames)))

   228                0xD31F)))

   229 

   230 ;; specs for main bootstrap program

   231 ;; starts in "mode-select" mode

   232 ;;   Each button press takes place in a single frame.

   233 ;;   mode-select-mode takes one of the main buttons

   234 ;;   which selects one of up to eight modes

   235 ;;   mode 1 activated by the "A" button

   236 ;;   the next two button presses indicates the start

   237 ;;   memory location which to which the bootstrap

   238 ;;   program will write.

   239 ;;   This is done by using each of the eight buttons to

   240 ;;   spell out an 8 bit number.  The order of buttons is

   241 ;;   [:d :u :l :r :start :select :b :a]

   242 ;;   [:a :start :l]  -->  00101001

   243 

   244 ;;   the next button press determines how many bytes are to be

   245 ;;   written, starting at the start position.

   246 

   247 ;;   then, the actual bytes are entered and are written to the

   248 ;;   start address in sequence.

   249 

   250 (defn input-number-assembly []

   251   [0x18   ;D31D                    ; jump over          

   252    0x02   ;D31E                    ; the next 2 bytes

   253    0x00   ;D31F                    ; frame-count

   254    0x00   ;D320                    ; v-blank-prev

   255    

   256    0xFA   ;D321

   257    0x41   ;D322                    ; load (FF41) into A

   258    0xFF   ;D323                    ; this contains mode flags

   259    

   260    ;; if we're in v-blank, the bit-1 is 0

   261    ;; and bit-2 is 1  Otherwise, it is not v-blank.

   262    0xCB   ;D324                     ; test bit-1 of A

   263    0x4F   ;D325                         

   264 

   265    0xC2   ;D326                     ; if bit-1 is not 0

   266    0x44   ;D327                     ; GOTO not-v-blank

   267    0xD3   ;D328

   268    

   269    0xCB   ;D329                     ; test bit-0 of A 

   270    0x47   ;D32A

   271 

   272    0xCA   ;D32B                     ; if bit-0 is not 1

   273    0x44   ;D32C                     ; GOTO not-v-blank

   274    0xD3   ;D32D

   275    

   276         ;;; in v-blank mode

   277 

   278    ;; if v-blank-prev was 0,

   279    ;; increment frame-count

   280 

   281    0xFA   ;D32E                    ; load v-blank-prev to A

   282    0x20   ;D32F

   283    0xD3   ;D330

   284    

   285    0xCB   ;D331

   286    0x47   ;D332                    ; test bit-0 of A 

   287 

   288    0x20   ;D333                    ; skip next section

   289    0x07   ;D334                    ; if v-blank-prev was not zero 

   290    

   291    ;; v-blank was 0, increment frame-count

   292    0xFA   ;D335                    ; load frame-count into A

   293    0x1F   ;D336

   294    0xD3   ;D337                   

   295 

   296    0x3C   ;D338                    ; inc A

   297 

   298    0xEA   ;D339                    ; load A into frame-count

   299    0x1F   ;D33A

   300    0xD3   ;D33B

   301 

   302    ;; set v-blank-prev to 1

   303    0x3E   ;D33C                    ; load 1 into A

   304    0x01   ;D33D                    

   305 

   306    0xEA   ;D33E                    ; load A into v-blank-prev

   307    0x20   ;D33F

   308    0xD3   ;D340

   309 

   310    0xC3   ;D341                   ; GOTO input handling code

   311    0x4E   ;D342

   312    0xD3   ;D343

   313 

   314         ;;; not in v-blank mode

   315    ;; set v-blank-prev to 0

   316    0x3E   ;D344                    ; load 0 into A        

   317    0x00   ;D345

   318 

   319    0xEA   ;D346                    ; load A into v-blank-prev

   320    0x20   ;D347

   321    0xD3   ;D348

   322 

   323    0xC3   ;D349                   ; return to beginning

   324    0x1D   ;D34A

   325    0xD3   ;D34B

   326 

   327    0x00   ;D34C                   ; these are here 

   328    0x00   ;D34D                   ; for glue

   329    

   330    

   331         ;;; calculate input number based on button presses

   332    0x18   ;D34E                    ;  skip next 3 bytes

   333    0x03   ;D34F

   334                                         ;D350

   335    (Integer/parseInt "00100000" 2) ;  select directional pad

   336                                         ;D351

   337    (Integer/parseInt "00010000" 2) ;  select buttons

   338    0x00   ;D352                    ;  input-number

   339 

   340    ;; select directional pad, store low bits in B

   341    

   342    0xFA   ;D353                    ; load (D350) into A

   343    0x50   ;D354      -->       

   344    0xD3   ;D355      -->  D31F     

   345    

   346    0xEA   ;D356                    ; load A, which is 

   347    0x00   ;D357      -->           ; 00010000, into FF00

   348    0xFF   ;D358      -->  FF00     

   349 

   350    0x06   ;D359

   351                                         ;D35A

   352    (Integer/parseInt "11110000" 2) ; "11110000" -> B 

   353    0xFA   ;D35B                    ; (FF00) -> A

   354    0x00   ;D35C                   

   355    0xFF   ;D35D

   356 

   357    0xCB   ;D35E                    ; swap nybbles on A

   358    0x37   ;D35F

   359    0xA0   ;D360                    ; (AND A B) -> A

   360    0x47   ;D361                    ; A -> B

   361 

   362    ;; select buttons store bottom bits in C

   363    

   364    0xFA   ;                        ; load (D351) into A

   365    0x51   ;          -->       

   366    0xD3   ;          -->  D31F     

   367    

   368    0xEA   ;                        ; load (A), which is 

   369    0x00   ;          -->           ; 00001000, into FF00

   370    0xFF   ;          -->  FF00     

   371 

   372    0x0E   ;    

   373    (Integer/parseInt "00001111" 2) ; "00001111" -> C 

   374 

   375    0xFA   ;                        ; (FF00) -> A

   376    0x00   ;                       

   377    0xFF   ;    

   378    

   379    0xA1   ;                        ; (AND A C) -> A

   380    0x4F   ;                        ; A -> C

   381 

   382    ;; combine the B and C registers into the input number

   383    0x79   ;                        ; C -> A

   384    0xB0   ;                        ; (OR A B) -> A

   385    0x2F   ;                        ; negate A

   386 

   387    0xEA   ;                        ; store A into input-number

   388    0x52   ;

   389    0xD3   ;

   390 

   391    0xC3   ;                        ; return to beginning

   392    0x1D   ;    

   393    0xD3   ;    

   394    ])

   395 

   396 

   397 

   398 (defn input-number []

   399   (-> (tick (mid-game))

   400       (IE! 0) ; disable interrupts

   401       (inject-item-assembly (input-number-assembly))))

   402   

   403 (defn test-input-number

   404   "Input freestyle buttons and observe the effects at the repl."

   405   []

   406   (set-state! (input-number)) 

   407   (dotimes [_ 90000] (step (view-memory @current-state 0xD352))))

   408 

   409 

   410     

   411 

   412 

   413 

   414 

   415 

   416 

   417 

   418 

   419 

   420 

   421 

   422 

   423 

   424 

   425 

   426 

   427 

   428 

   429 

   430 

   431 

   432 

   433 

   434 

   435 

   436 

   437 (defn write-memory-assembly*

   438   "Currently, grabs input from the user each frame."

   439   []

   440   [

   441    ;; --------- FRAME METRONOME

   442    0x18 ;; jump ahead to cleanup. first time only.

   443    0x40 ;; v-blank-prev [D31E]

   444 

   445    0xFA ;; load modes into A [D31F]

   446    0x41

   447    0xFF

   448 

   449    0x47 ;; A -> B

   450    0xCB ;; rotate A

   451    0x2F

   452    0x2F ;; invert A

   453 

   454    0xA0

   455    0x47 ;; now B_0 contains (VB==1)

   456 

   457    0xFA ;; load v-blank-prev

   458    0x1E

   459    0xD3

   460 

   461    0x2F ;; complement v-blank-prev

   462    

   463    0xA0 ;; A & B --> A

   464    0x4F ;; now C_0 contains increment?

   465 

   466 

   467    0x78 ;; B->A

   468    0xEA ;; spit A --> vbprev

   469    0x1E

   470    0xD3

   471 

   472    0xCB   ;test C_0

   473    0x41

   474    0x20   ; JUMP ahead to button input if nonzero

   475    0x02

   476    0x18   ; JUMP  back to frame metronome (D31F)

   477    0xE7

   478    

   479    ;; -------- GET BUTTON INPUT

   480 

   481         ;; btw, C_0 is now 1

   482         ;; prepare to select bits

   483 

   484    0x06 ;; load 0x00 into B

   485    0x00 ;; to initialize for "OR" loop

   486  

   487    0x3E ;; load 0x20 into A, to measure dpad

   488    0x20

   489 

   490    

   491    0xE0 ;; load A into [FF00] ;; start of OR loop [D33C]

   492    0x00

   493    

   494    0xF0 ;; load A from [FF00]

   495    0x00

   496 

   497    0xE6 ;; bitmask 00001111

   498    0x0F

   499    

   500    0xB0 ;; A or B --> A

   501    0xCB

   502    0x41 ;; test bit 0 of C

   503    0x28 ;; JUMP forward if 0

   504    0x08

   505 

   506    0x47 ;; A -> B

   507    0xCB ;; swap B nybbles

   508    0x30 

   509    0x0C ;; increment C

   510    0x3E ;; load 0x10 into A, to measure btns

   511    0x10

   512    0x18 ;; JUMP back to "load A into [FF00]" [20 steps?]

   513    0xED

   514 

   515 

   516    ;; ------ TAKE ACTION BASED ON USER INPUT

   517 

   518    ;; "input mode"

   519    ;; mode 0x00 : select mode

   520    ;; mode 0x08 : select bytes-to-write

   521    ;; mode 0x10 : select hi-bit

   522    ;; mode 0x18 : select lo-bit

   523 

   524    ;; "output mode"

   525    ;; mode 0x20 : write bytes

   526    ;; mode 0xFF : jump PC

   527 

   528 

   529    ;; registers

   530    ;; D : mode select

   531    ;; E : count of bytes to write

   532    ;; H : address-high

   533    ;; L : address-low

   534    

   535    ;; now A contains the pressed keys

   536    0x2F ; complement A, by request. [D34F]

   537    

   538    0x47 ; A->B ;; now B contains the pressed keys

   539    0x7B ; E->A ;; now A contains the count.

   540 

   541    0xCB ; test bit 5 of D (are we in o/p mode?)

   542    0x6A

   543    0x28 ; if test == 0, skip this o/p section

   544    0x13 ; JUMP

   545    

   546    0xCB ; else, test bit 0 of D (fragile; are we in pc mode?)

   547    0x42

   548    0x28 ; if test == 0, skip the following command

   549    0x01

   550 

   551    ;; output mode I: moving the program counter

   552    0xE9 ; ** move PC to (HL)

   553 

   554    ;; output mode II: writing bytes

   555    0xFE ; A compare 0. finished writing?

   556    0x00

   557    0x20 ; if we are not finished, skip cleanup

   558    0x04 ; JUMP

   559 

   560    ;; CLEANUP

   561    ;; btw, A is already zero.

   562    0xAF ; zero A  [D35F]

   563    0x57 ; A->D; makes D=0.

   564    0x18 ; end of frame

   565    0xBC

   566    

   567    ;; ---- end of cleanup

   568 

   569    

   570    ;; continue writing bytes

   571    0x1D ;; decrement E, the number of bytes to write [D363]

   572    0x78 ;; B->A; now A contains the pressed keys

   573    0x77 ;; copy A to (HL)

   574    0x23 ;; increment HL

   575    0x18 ;; end frame. [goto D31F]

   576    0xB6 ;; TODO: set skip length backwards

   577 

   578 

   579    ;; ---- end of o/p section

   580    

   581    ;; i/p mode

   582    ;; adhere to the mode discipline:

   583    ;; D must be one of 0x00 0x08 0x10 0x18.

   584 

   585    0x3E ;; load the constant 57 into A. [D369]

   586    0x57

   587    0x82 ;; add the mode to A

   588    0xEA ;; store A into "thing to execute"

   589    0x74

   590    0xD3

   591 

   592    0x3E ;; load the constant 8 into A

   593    0x08

   594    0x82 ;; add the mode to A

   595    

   596    0x57 ;; store the incremented mode into D

   597    0x78 ;; B->A; now A contains the pressed keys

   598    

   599    0x00 ;; var: thing to execute [D374]

   600 

   601    0x18 ;; end frame

   602    0xA8

   603    ]

   604   )

   605 

   606 (defn write-mem-dyl []

   607   (-> (tick (mid-game))

   608       (IE! 0)

   609       (inject-item-assembly (write-memory-assembly*))))

   610 

   611 

   612 (defn dylan* []

   613   (->

   614    (write-mem-dyl)

   615 

   616    (tick)

   617    (tick)

   618    (tick)

   619    (tick)

   620    (tick)

   621    (tick)

   622    (tick)

   623    (tick)

   624    (tick)

   625    (tick)

   626    (tick)

   627    (tick)

   628    (tick)

   629    (tick)

   630    (tick)

   631    (tick)

   632    (tick)

   633    (tick)

   634    (tick)

   635    (tick)

   636    (tick)

   637    (tick)

   638    (tick)

   639    (tick)

   640    (tick)

   641    (tick)

   642    (tick)

   643    (tick)

   644    (tick)

   645    (tick)

   646    (tick)

   647    (tick)

   648    (tick)

   649    (tick)

   650    (tick)

   651    (tick)

   652 

   653    ;;(view-memory 0xD374)

   654    (tick)

   655    (tick)

   656    (tick)

   657    (tick)

   658    (tick)

   659    (tick)

   660    (tick)

   661    (tick)

   662    (tick)

   663    (tick)

   664    (tick)

   665    (tick)

   666    (tick)

   667    (tick)

   668    (tick)

   669    ;;(view-memory 0xD374)

   670    (d-tick)

   671 

   672    (view-register "A" A)

   673    (view-register "B" B)

   674    (view-register "C" C))

   675 

   676 )

   677 

   678 

   679 (defn dylan []

   680   (->

   681    (write-mem-dyl)

   682    (tick)

   683    (tick)

   684    (tick)

   685    (tick)

   686    (tick)

   687    (tick)

   688    (tick)

   689    (tick)

   690    (tick)

   691    (tick)

   692    (tick)

   693    (tick)

   694    (tick)

   695    (tick)

   696    (tick) ;; first loop

   697 

   698 

   699    (tick)

   700    (tick)

   701    (tick)

   702    (tick)

   703    (tick)

   704    (tick)

   705    (tick)

   706    (tick)

   707    (tick)

   708    (tick)

   709    (tick)

   710    (tick)

   711    (tick) ;; dpad bits

   712 

   713    (tick)

   714    (tick)

   715    (tick)

   716    (tick)

   717    (tick)

   718    (tick)

   719    (tick)

   720    (tick)

   721    (d-tick)

   722    

   723 

   724    

   725    (view-register "A" A)

   726    (view-register "B" B)

   727    (view-register "C" C)

   728    

   729    ))

   730 

   731 

   732 

   733 

   734 (defn d2 []

   735   (->

   736    (write-mem-dyl)

   737    (view-memory 0xD31F)

   738    step step step step step

   739    (view-memory 0xD31F)))

   740 

   741 

   742 

   743 

   744 

   745 

   746 

   747 

   748 

   749 

   750 

   751 

   752 

   753 

   754 

   755 

   756 

   757 

   758 

   759 

   760 (defn write-memory-assembly []

   761   [

   762    ;; Main Timing Loop

   763    ;;   Constantly check for v-blank and Trigger main state machine on

   764    ;;   every transtion from v-blank to non-v-blank.

   765     

   766    0x18   ; D31D                  ; Variable declaration

   767    0x02   ; D31E                   

   768    0x00   ; D31F                  ; frame-count

   769    0x00   ; D320                  ; v-blank-prev 

   770    

   771    0xF0   ; D321                  ; load v-blank mode flags into A

   772    0x41

   773    0x00

   774 

   775 

   776    ;; Branch dependent on v-blank.  v-blank happens when the last two

   777    ;; bits in A are "01"

   778    0xCB   ; D324                  

   779    0x4F   ; D325                  

   780 

   781    0xC2   ; D326                  ; if bit-1 is not 0, then

   782    0x3E   ; D327                  ; GOTO non-v-blank.

   783    0xD3   ; D328                  

   784 

   785    0xCB   ; D329                  

   786    0x47   ; D32A                  

   787 

   788    0xCA   ; D32B                  ; if bit-0 is not 1, then

   789    0x3E   ; D32C                  ; GOTO non-v-blank.

   790    0xD3   ; D32D                  

   791 

   792    ;; V-Blank

   793    ;;   Activate state-machine if this is a transition event.

   794 

   795    0xFA   ; D32E                  ; load v-bank-prev into A

   796    0x20   ; D32F                  

   797    0xD3   ; D330                  

   798 

   799    0xFE   ; D331                  ; compare A to 0. >--------\ 

   800    0x00   ; D332                                              \

   801                                   ;                           |

   802    ;;   set v-blank-prev to 1.                                |

   803    0x3E   ; D333                  ; load 1 into A.            |

   804    0x01   ; D334                                              | 

   805                                   ;                           |

   806    0xEA   ; D335                  ; load A into v-blank-prev  |

   807    0x20   ; D336                                              |

   808    0xD3   ; D337                                              |

   809                                   ;                           /

   810    ;;   if v-blank-prev was 0, activate state-machine <------/

   811    0xCA   ; D338                  ; if v-blank-prev 

   812    0x46   ; D339                  ;   was 0, 

   813    0xD3   ; D33A                  ; GOTO state-machine

   814 

   815    0xC3   ; D33B                  

   816    0x1D   ; D33C                  

   817    0xD3   ; D33D                  ; GOTO beginning

   818    ;; END V-blank

   819 

   820    ;; Non-V-Blank

   821    ;;   Set v-blank-prev to 0

   822    0x3E   ; D33E                  ; load 0 into A

   823    0x00   ; D33F                  

   824 

   825    0xEA   ; D340                  ; load A into v-blank-prev

   826    0x20   ; D341                  

   827    0xD3   ; D342

   828    

   829    0xC3   ; D343                  

   830    0x1D   ; D344                  

   831    0xD3   ; D345                  ; GOTO beginning

   832    ;; END Not-V-Blank

   833 

   834    

   835    ;; Main State Machine -- Input Section

   836    ;;   This is called once every frame.

   837    ;;   It collects input and uses it to drive the

   838    ;;   state transitions.

   839 

   840    ;; Increment frame-count

   841    0xFA   ; D346                  ; load frame-count into A

   842    0x1F   ; D347                  

   843    0xD3   ; D348

   844    

   845    0x3C   ; D349                  ; inc A

   846 

   847    0xEA   ; D34A                  

   848    0x1F   ; D34B                  ; load A into frame-count

   849    0xD3   ; D34C

   850 

   851    0x00   ; D34D                  ; glue :)

   852    

   853    0x18   ;D34E                    ;  skip next 3 bytes

   854    0x03   ;D34F

   855           ;D350

   856    (Integer/parseInt "00100000" 2) ;  select directional pad

   857           ;D351

   858    (Integer/parseInt "00010000" 2) ;  select buttons

   859    0x00   ;D352                    ;  input-number

   860 

   861    ;; select directional pad; store low bits in B

   862    

   863    0xFA   ;D353                    ; load (D350) into A

   864    0x50   ;D354      -->       

   865    0xD3   ;D355      -->  D350     

   866    

   867    0xE0   ;D356                    ; load (A), which is 

   868    0x00   ;D357      -->           ; 00010000, into FF00

   869    0x00   ;D358      -->  FF00     ;; NO-OP

   870 

   871    0x06   ;D359

   872           ;D35A

   873    (Integer/parseInt "11110000" 2) ; "11110000" -> B 

   874    0xF0   ;D35B                    ; (FF00) -> A

   875    0x00   ;D35C                   

   876    0x00   ;D35D                    ;; NO-OP

   877 

   878    0xCB   ;D35E                    ; swap nybbles on A

   879    0x37   ;D35F

   880    0xA0   ;D360                    ; (AND A B) -> A

   881    0x47   ;D361                    ; A -> B

   882 

   883    ;; select buttons; store bottom bits in C

   884    

   885    0xFA   ;D362                    ; load (D351) into A

   886    0x51   ;D363      -->       

   887    0xD3   ;D364      -->  D351     

   888    

   889    0xE0   ;D365                    ; load (A), which is 

   890    0x00   ;D366      -->           ; 00001000, into FF00

   891    0x00   ;D367      -->  FF00     ;; NO-OP

   892 

   893    0x0E   ;D368

   894           ;D369

   895    (Integer/parseInt "00001111" 2) ; "00001111" -> C 

   896 

   897    0xF0   ;D36A                    ; (FF00) -> A

   898    0x00   ;D36B                   

   899    0x00   ;D36C

   900    

   901    0xA1   ;D36D                    ; (AND A C) -> A

   902    0x4F   ;D36E                    ; A -> C

   903 

   904    ;; combine the B and C registers into the input number

   905    0x79   ;D36F                    ; C -> A

   906    0xB0   ;D370                    ; (OR A B) -> A

   907    0x2F   ;D371                    ; negate A

   908 

   909    0xEA   ;D372                    ; store A into input-number

   910    0x52   ;D373

   911    0xD3   ;D374

   912 

   913    0x00   ;D375                  

   914    0x00   ;D376

   915    0x00   ;D377

   916    0x00   ;D378

   917    0x00   ;D379

   918    0x00   ;D37A

   919    0x00   ;D37B                   ; these are here because 

   920    0x00   ;D37C                   ; I messed up :(

   921    0x00   ;D37D

   922    0x00   ;D37E

   923    0x00   ;D37F

   924    

   925    ;; beginning of main state machine   

   926    0x18   ;D380                    ; Declaration of variables

   927    0x05   ;D381                    ;  5 variables:

   928    0x00   ;D382                    ;    current-mode

   929    0x00   ;D383                    ;    bytes-to-write

   930    0x00   ;D384                    ;    bytes-written

   931    0x00   ;D385                    ;    start-point-high

   932    0x00   ;D386                    ;    start-point-low

   933 

   934 

   935    ;; banch on current mode

   936    0xFA   ;D387                    ; load current-mode (0xD382)

   937    0x82   ;D388                    ; into A

   938    0xD3   ;D389

   939    0x00   ;D38A

   940 

   941 

   942    ;;  GOTO Mode 0 (input-mode) if current-mode is 0

   943    0xFE   ;D38B

   944    0x00   ;D38C                    ; compare A with 0x00

   945 

   946    0xCA   ;D38D                    ; goto Mode 0 if A == 0

   947    0xA8   ;D38E

   948    0xD3   ;D38F

   949 

   950    ;; GOTO Mode 1 (set-length) if current-mode is 1

   951    0xFE   ;D390

   952    0x01   ;D391                    ; compare A with 0x01

   953 

   954    0xCA   ;D392                  

   955    0xB1   ;D393 

   956    0xD3   ;D394                    ; goto Mode 1 if A == 1

   957 

   958    ;; GOTO Mode 2 (set-start-point-high) if current mode is 2

   959    0xFE   ;D395                    

   960    0x02   ;D396                    ; compare A with 0x02

   961 

   962    0xCA   ;D397

   963    0xBF   ;D398

   964    0xD3   ;D399                    ; goto Mode 2 if A == 2

   965 

   966    ;; GOTO Mode 3 (set-start-point-low) if current mode is 3

   967    0xFE   ;D39A

   968    0x03   ;D39B

   969 

   970    0xCA   ;D39C

   971    0xCD   ;D39D

   972    0xD3   ;D39E                    ; goto Mode 3 if A == 3

   973 

   974    ;; GOTO Mode 4 (write-memory) if current mode is 4

   975    0xFE   ;D39F

   976    0x04   ;D3A0

   977 

   978    0xCA   ;D3A1

   979    0xDB   ;D3A2

   980    0xD3   ;D3A3

   981 

   982    0x00   ;D3A4

   983    ;; End of Mode checking, goto beginning

   984    0xC3   ;D3A5

   985    0x1D   ;D3A6

   986    0xD3   ;D3A7

   987 

   988 

   989    ;; Mode 0 -- input-mode mode

   990    ;;     means that we are waiting for a mode, so set the mode to

   991    ;;     whatever is currently in input-number.  If nothing is

   992    ;;     entered, then the program stays in input-mode mode

   993 

   994    ;;   set current-mode to input-number

   995    0xFA   ;D3A8                    ; load input-number (0xD352) 

   996    0x52   ;D3A9                    ; into A

   997    0xD3   ;D3AA

   998 

   999    0xEA   ;D3AB                    ; load A into current-mode

  1000    0x82   ;D3AC                    ; (0xD382)

  1001    0xD3   ;D3AD

  1002 

  1003    0xC3   ;D3AE                    ; go back to beginning

  1004    0x1D   ;D3AF

  1005    0xD3   ;D3B0

  1006    ;; End Mode 0

  1007 

  1008 

  1009    ;; Mode 1 -- set-length mode

  1010    ;;      This is the header for writing things to memory.

  1011    ;;      User specifies the number of bytes to write.

  1012    ;;      Mode is auto advanced to Mode 2 after this mode

  1013    ;;      completes.

  1014 

  1015    ;;      Set bytes left to write to input-number;

  1016    ;;      set current-mode to 0x02.

  1017    0xFA   ;D3B1                   ; load input-number (0xD352)

  1018    0x52   ;D3B2                   ; into A

  1019    0xD3   ;D3B3

  1020    

  1021    0xEA   ;D3B4                   ; load A into bytes-left-to-write

  1022    0x83   ;D3B5                   ; (0xD383)

  1023    0xD3   ;D3B6

  1024 

  1025    0x3E   ;D3B7                   ; load 0x02 into A.

  1026    0x02   ;D3B8

  1027    

  1028    0xEA   ;D3B9                   ; load A to current-mode

  1029    0x82   ;D3BA                   ; advancing from Mode 1 to 

  1030    0xD3   ;D3BB                   ; Mode 2

  1031    

  1032    0xC3   ;D3BC                   ; go back to beginning

  1033    0x1D   ;D3BD

  1034    0xD3   ;D3BE

  1035    ;; End Mode 1

  1036 

  1037 

  1038    ;; Mode 2 -- set start-point-high mode

  1039    ;;      Middle part of the header for writing things to memory.

  1040    ;;      User specifies the start location in RAM to which 

  1041    ;;      data will be written.

  1042    ;;      Mode is auto advanced to Mode 3 after this mode completes.

  1043 

  1044    ;;      Set start-point-high to input-number;

  1045    ;;      set current mode to 0x03.

  1046    0xFA   ;D3BF                   ; load input-number (0xD352)

  1047    0x52   ;D3C0                   ; into A

  1048    0xD3   ;D3C1

  1049 

  1050    0xEA   ;D3C2                   ; load A into start-point-high

  1051    0x85   ;D3C3                   ; (0xD385)

  1052    0xD3   ;D3C4

  1053 

  1054    0x3E   ;D3C5                   ; load 0x03 into A.

  1055    0x03   ;D3C6

  1056 

  1057    0xEA   ;D3C7                   ; load A to current-mode,

  1058    0x82   ;D3C8                   ; advancing from Mode 2 to 

  1059    0xD3   ;D3C9                   ; Mode 3.

  1060    

  1061    0xC3   ;D3CA                   ; go back to beginning

  1062    0x1D   ;D3CB

  1063    0xD3   ;D3CC

  1064    ;;End Mode 2

  1065 

  1066 

  1067    ;; Mode 3 -- set-start-point-low mode

  1068    ;;      Final part of header for writing things to memory.

  1069    ;;      User specifies the low bytes of 16 bit start-point.

  1070 

  1071    ;;      Set start-point-low to input-number;

  1072    ;;      set current mode to 0x04

  1073    0xFA   ;D3CD                   ; load input-number into A

  1074    0x52   ;D3CE                   

  1075    0xD3   ;D3CF                   

  1076 

  1077    0xEA   ;D3D0                   ; load A into start-point-low

  1078    0x86   ;D3D1                   

  1079    0xD3   ;D3D2                   

  1080 

  1081    0x3E   ;D3D3                   ; load 0x04 into A.

  1082    0x04   ;D3D4                   

  1083 

  1084    0xEA   ;D3D5                   ; load A to current-mode,

  1085    0x82   ;D3D6                   ; advancing from Mode 3 to 

  1086    0xD3   ;D3D7                   ; Mode 4.

  1087 

  1088    0xC3   ;D3D8                   ; go back to beginning

  1089    0x1D   ;D3D9                   

  1090    0xD3   ;D3DA                   

  1091    

  1092    ;; Mode 4 -- write bytes mode

  1093 

  1094    ;;      This is where RAM manipulation happens.  User supplies

  1095    ;;      bytes every frame, which are written sequentially to

  1096    ;;      start-point until bytes-to-write have been written. Once

  1097    ;;      bytes-to-write have been written, the mode is reset to 0.

  1098 

  1099    ;;   compare bytes-written with bytes-to-write.

  1100    ;;   if they are the same, then reset mode to 0

  1101   

  1102    0xFA   ;D3DB                   ; load bytes-to-write into A

  1103    0x83   ;D3DC

  1104    0xD3   ;D3DD

  1105 

  1106    0x47   ;D3DE                   ; load A into B

  1107 

  1108    0xFA   ;D3DF                   ; load bytes-written into A

  1109    0x84   ;D3E0

  1110    0xD3   ;D3E1

  1111 

  1112    0xB8   ;D3E2                   ; compare A with B

  1113 

  1114    0xCA   ;D3E3                   ; if they are equal, go to cleanup

  1115    0x07   ;D3E4                   

  1116    0xD4   ;D3E5                   

  1117 

  1118    ;;  Write Memory Section

  1119    ;;    Write the input-number, interpreted as an 8-bit number,

  1120    ;;    into the current target register, determined by

  1121    ;;    (+ start-point bytes-written).

  1122    ;;    Then, increment bytes-written by 1.

  1123    

  1124    0xFA   ;D3E6                   ; load start-point-high into A

  1125    0x85   ;D3E7                   

  1126    0xD3   ;D3E8                   

  1127 

  1128    0x67   ;D3E9                   ; load A into H

  1129 

  1130    0xFA   ;D3EA                   ; load start-point-low into A

  1131    0x86   ;D3EB                   

  1132    0xD3   ;D3EC

  1133    

  1134    0x6F   ;D3ED                   ; load A into L

  1135    

  1136    0xFA   ;D3EE                   ; load bytes-written into A

  1137    0x84   ;D3EF                   

  1138    0xD3   ;D3F0                   

  1139    

  1140    0x00   ;D3F1                   ; These are here because

  1141    0x00   ;D3F2                   ; I screwed up again.

  1142    0x00   ;D3F3                   

  1143 

  1144    0x85   ;D3F4                   ; add L to A; store A in L.

  1145    0x6F   ;D3F5                   

  1146 

  1147    0x30   ;D3F6                   ; If the addition overflowed,

  1148    0x01   ;D3F7                   

  1149    0x24   ;D3F8                   ; increment H.

  1150 

  1151    ;;   Now, HL points to the correct place in memory

  1152    

  1153    0xFA   ;D3F9                   ; load input-number into A

  1154    0x52   ;D3FA                   

  1155    0xD3   ;D3FB                   

  1156 

  1157    0x77   ;D3FC                   ; load A into (HL)

  1158 

  1159    0xFA   ;D3FD                   ; load bytes-written into A

  1160    0x84   ;D3FE                   

  1161    0xD3   ;D3FF                   

  1162 

  1163    0x3C   ;D400                   ; increment A

  1164 

  1165    0xEA   ;D401                   ; load A into bytes-written

  1166    0x84   ;D402                   

  1167    0xD3   ;D403

  1168 

  1169    0xC3   ;D404                   ; go back to beginning.

  1170    0x1D   ;D405

  1171    0xD3   ;D406

  1172    ;;  End Write Memory Section

  1173 

  1174    ;;  Mode 4 Cleanup Section

  1175    ;;    reset bytes-written to 0

  1176    ;;    set mode to 0

  1177    0x3E   ;D407                   ; load 0 into A

  1178    0x00   ;D408                  

  1179 

  1180    0xEA   ;D409                   ; load A into bytes-written

  1181    0x84   ;D40A                   

  1182    0xD3   ;D40B                   

  1183 

  1184    0xEA   ;D40C                   ; load A into current-mode

  1185    0x82   ;D40D                   

  1186    0xD3   ;D40E                   

  1187 

  1188    0xC3   ;D40F                    ; go back to beginning

  1189    0x1D   ;D410

  1190    0xD3   ;D411

  1191 

  1192    ;; End Mode 4

  1193    

  1194    ])

  1195 

  1196 

  1197 

  1198 (def frame-count 0xD31F)

  1199 (def input 0xD352)

  1200 (def current-mode      0xD382)

  1201 (def bytes-to-write    0xD383)

  1202 (def bytes-written     0xD384)

  1203 (def start-point-high  0xD385)

  1204 (def start-point-low   0xD386)

  1205 

  1206 

  1207 

  1208 (defn write-memory []

  1209   (-> (tick (mid-game))

  1210       (IE! 0) ; disable interrupts

  1211       (inject-item-assembly (write-memory-assembly))))

  1212 

  1213 (defn test-write-memory []

  1214   (set-state! (write-memory))

  1215   (dorun

  1216    (dotimes [_ 5000]

  1217      (view-memory (step @current-state) current-mode))))

  1218 

  1219 (def bytes-to-write 0xD383)

  1220 (def start-point 0xD384)

  1221 

  1222 (defn print-blank-assembly

  1223   [start end]

  1224   (dorun

  1225    (map

  1226     #(println (format "0x00   ;%04X                   " %))

  1227     (range start end))))

  1228 

  1229 (defn test-mode-2 []

  1230   (->

  1231    (write-memory)

  1232    (view-memory frame-count)

  1233    (step)

  1234    (step [:a])

  1235    (step [:b])

  1236    (step [:start])

  1237    (step [])

  1238    (view-memory frame-count)))

  1239 

  1240 

  1241 

  1242 (defn dylan-test-mode

  1243   ([] (dylan-test-mode (write-mem-dyl)))

  1244   ([target-state]

  1245      (let [

  1246            v-blank-prev 54046

  1247            btn-register 65280

  1248            eggs 0xD374

  1249            ]

  1250        

  1251        (->

  1252         target-state

  1253         

  1254         (tick)

  1255         (tick)

  1256         (tick)

  1257         (tick);; jumps back to beginning

  1258         

  1259         (tick)

  1260         (tick)

  1261         (tick)

  1262         (tick)

  1263         (tick)

  1264         (tick)

  1265         (tick)

  1266         (tick)

  1267         (tick)

  1268         (tick)

  1269         (tick)

  1270         (tick)

  1271 

  1272                

  1273         (tick)

  1274         (tick)

  1275         (tick)

  1276         (tick)

  1277         (tick)

  1278         (tick)

  1279         (tick)

  1280         (tick)

  1281         (tick)

  1282         (tick)

  1283         (tick)

  1284         (tick)

  1285         (tick)

  1286         (tick)

  1287         (tick)

  1288         (tick)

  1289         (tick)

  1290         (tick)

  1291         (tick)

  1292         (tick)

  1293         (tick) ;; just complemented A

  1294 

  1295         (tick)

  1296         (DE! 0x1800)

  1297         (AF! 0x7700) ;; change inputs @ A

  1298         (tick)

  1299         (tick)

  1300         (tick)

  1301         (tick)

  1302         (tick)

  1303 

  1304         ;;(view-memory eggs)

  1305         (tick)

  1306         (tick)

  1307         ;;(view-memory eggs)

  1308         (tick)

  1309         (tick)

  1310         (tick)

  1311         (tick)

  1312         (tick)

  1313         (tick)

  1314         (d-tick)

  1315 

  1316         

  1317         ;;(view-memory btn-register) 

  1318         (view-register "A" A)

  1319         (view-register "B" B)

  1320         

  1321         ;;(view-register "C" C)

  1322         (view-register "D" D)

  1323         (view-register "E" E)

  1324         (view-register "H" H)

  1325         (view-register "L" L)

  1326         ))))

  1327   

  1328 

  1329 

  1330 (defn drive-dylan []

  1331   (-> (write-mem-dyl)

  1332       (#(do (println "memory from 0xC00F to 0xC01F:"

  1333                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %))

  1334       (step [])

  1335       (step [])

  1336       (step [])

  1337       (step [:start])

  1338       (step [:select])

  1339       (step [:u :d])

  1340       (step [:a :b :start :select])

  1341       (step [:a])

  1342       (step [:b])

  1343       (step [:a :b])

  1344       (step [:select])

  1345       (step [])

  1346       (step [])

  1347       (step [])

  1348       (#(do (println "memory from 0xC00F to 0xC01F:"

  1349                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %))

  1350       ))

  1351 

  1352 (defn test-mode-4

  1353   ([] (test-mode-4 (write-memory)))

  1354   ([target-state]

  1355      (->

  1356       target-state

  1357       (#(do (println "memory from 0xC00F to 0xC01F:"

  1358                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %))

  1359       (view-memory current-mode)

  1360       (step [])

  1361       (step [])

  1362       (step [])

  1363       (#(do (println "after three steps") %))

  1364       (view-memory current-mode)

  1365 

  1366       ;; Activate memory writing mode

  1367       

  1368       (#(do (println "step with [:a]") %))

  1369       (step [:a])

  1370       (view-memory current-mode)

  1371       (view-memory bytes-to-write)

  1372       (view-memory start-point-high)

  1373       (view-memory start-point-low)

  1374 

  1375       ;; Specify four bytes to be written

  1376       

  1377       (#(do (println "step with [:select]")%))

  1378       (step [:select])

  1379       (view-memory current-mode)

  1380       (view-memory bytes-to-write)

  1381       (view-memory start-point-high)

  1382       (view-memory start-point-low)

  1383 

  1384       ;; Specify target memory address as 0xC00F

  1385       

  1386       (#(do (println "step with [:u :d]")%))

  1387       (step [:u :d])

  1388       (view-memory current-mode)

  1389       (view-memory bytes-to-write)

  1390       (view-memory start-point-high)

  1391       (view-memory start-point-low)

  1392 

  1393       (#(do (println "step with [:a :b :start :select]")%))

  1394       (step [:a :b :start :select])

  1395       (view-memory current-mode)

  1396       (view-memory bytes-to-write)

  1397       (view-memory start-point-high)

  1398       (view-memory start-point-low)

  1399 

  1400       ;; Start reprogramming memory

  1401 

  1402       (#(do (println "step with [:a]")%))

  1403       (step [:a])

  1404       (view-memory current-mode)

  1405       (view-memory bytes-written)

  1406 

  1407       (#(do (println "step with [:b]")%))

  1408       (step [:b])

  1409       (view-memory current-mode)

  1410       (view-memory bytes-written)

  1411 

  1412       (#(do (println "step with [:a :b]")%))

  1413       (step [:a :b])

  1414       (view-memory current-mode)

  1415       (view-memory bytes-written)

  1416 

  1417       (#(do (println "step with [:select]")%))

  1418       (step [:select])

  1419       (view-memory current-mode)

  1420       (view-memory bytes-written)

  1421 

  1422       ;; Reprogramming done, program ready for more commands.

  1423 

  1424       (#(do (println "step with []")%))

  1425       (step [])

  1426       (view-memory current-mode)

  1427       (view-memory bytes-written)

  1428       

  1429       (#(do (println "memory from 0xC00F to 0xC01F:"

  1430                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %)))))

  1431
author	Robert McIntyre <rlm@mit.edu>
date	Tue, 20 Mar 2012 17:44:08 -0500
parents	412ca096a9ba
children	5d9a7a0ca09a