Mercurial > vba-clojure

     1 (ns com.aurellem.assembly

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

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

     4 

     5 (defn mid-game []

     6   (read-state "mid-game"))

     7 

     8 (defn inject-assembly

     9   ([^SaveState state

    10    program-counter registers

    11    assembly-code]

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

    13     ;; inject assembly code

    14     (dorun (map (fn [index val]

    15                   (aset scratch-memory index val))

    16                 (range program-counter

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

    18                 assembly-code))

    19     (-> state

    20         (write-memory! scratch-memory)

    21         (write-registers! registers)

    22         (PC! program-counter)))))

    23 

    24 (defn inject-item-assembly

    25   ([^SaveState state assembly-code]

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

    27                       (registers state)

    28                       assembly-code))

    29   ([assembly-code]

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

    31 

    32 (defn info

    33   ([^SaveState state]

    34      (println (format "PC: 0x%04X" (PC state)))

    35      (println "Instruction:"

    36               (format "0x%02X" (aget (memory state) (PC state))))

    37      state))    

    38 

    39 (defn print-interrupt

    40   [^SaveState state]

    41   (println (format "IE: %d" (IE state)))

    42   state)

    43 

    44 (defn print-listing [state begin end]

    45   (dorun (map 

    46           (fn [opcode line]

    47             (println (format "0x%04X:  0x%02X" line opcode)))

    48           (subvec  (vec (memory state)) begin end)

    49           (range begin end)))

    50   state)

    51 

    52 (defn run-assembly

    53   ([info-fn assembly n]

    54      (let [final-state

    55            (reduce (fn [state _]

    56                      (tick (info-fn state)))

    57                    (inject-item-assembly

    58                      (mid-game) assembly)

    59                    (range n))]

    60        final-state))

    61   ([assembly n]

    62      (run-assembly info assembly n)))

    63 

    64 (def buttons-port 0xFF00)

    65 

    66 (defn A [state]

    67   (bit-shift-right (bit-and 0x0000FF00 (AF state)) 8))

    68 

    69 (defn B [state]

    70   (bit-shift-right (bit-and 0x0000FF00 (BC state)) 8))

    71 

    72 (defn C [state]

    73   (bit-and 0xFF (BC state)))

    74 

    75 (defn binary-str [num]

    76   (format "%08d"

    77           (Integer/parseInt

    78            (Integer/toBinaryString num) 10)))

    79 

    80 (defn view-register [state name reg-fn]

    81   (println (format "%s: %s" name

    82                    (binary-str (reg-fn state))))

    83   state)

    84 

    85 (defn view-memory [state mem]

    86   (println (format "mem 0x%04X = %s" mem

    87                    (binary-str (aget (memory state) mem))))

    88   state)

    89 

    90 (defn trace [state]

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

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

    93     (let [frame-boundary?

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

    95       (if frame-boundary?

    96         [program-counters opcodes]

    97         (recur

    98          (conj program-counters

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

   100          (conj opcodes

   101                (aget (memory @current-state)

   102                      (PC @current-state))))))))

   103 

   104 (defn print-trace [state n]

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

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

   107                 (take n program-counters)

   108                 (take n opcodes)))))

   109 

   110 (defn good-trace []

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

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

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

   114       (info) (tick) (info) (tick) (info)))

   115 

   116 (defn read-down-button []

   117   (-> (tick (mid-game))

   118       (IE! 0) ; disable interrupts

   119       (inject-item-assembly

   120        ;; write 00010000 to 0xFF00 to select joypad

   121        [0x18   ;D31D                    ; jump over          

   122         0x01   ;D31E                    ; the next 8 bits

   123                                         ;D31F

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

   125         

   126         0xFA   ;D320                    ; load (D31F) into A

   127         0x1F   ;D321      -->       

   128         0xD3   ;D322      -->  D31F     

   129 

   130         0xEA   ;D323                    ; load (A), which is 

   131         0x00   ;D324      -->           ; 00010000, into FF00

   132         0xFF   ;D325      -->  FF00     

   133         

   134         0x18   ;D326                    ; this is the place where

   135         0x01   ;D327                    ; we will store whether

   136         0x00   ;D328                    ; "down" is pressed.

   137 

   138         0xFA   ;D329                    ; (FF00) -> A

   139         0x00   ;D32A                   

   140         0xFF   ;D32B

   141 

   142         0xCB   ;D32C                    ; Test whether "down"

   143         0x5F   ;D32D                    ; is pressed.

   144 

   145         0x28   ;D32E                    ; if down is pressed,

   146         0x03   ;D32F                    ; skip the next section 

   147                                         ; of code.

   148         ;; down-is-not-pressed

   149         0xC3   ;D330

   150         0x1D   ;D331                    ; return to beginning

   151         0xD3   ;D332

   152         

   153         ;; down-is-pressed 

   154         0xEA   ;D334                    ; write A to D328 if 

   155         0x28   ;D335                    ; "down" was pressed

   156         0xD3   ;D336

   157 

   158         0xC3   ;D330

   159         0x1D   ;D331                    ; return to beginning

   160         0xD3   ;D332

   161         ])))

   162 

   163 (defn test-read-down []

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

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

   166 

   167 (defn count-frames []

   168   (-> (tick (mid-game))

   169       (IE! 0) ; disable interrupts

   170       (inject-item-assembly

   171        [0x18   ;D31D                    ; jump over          

   172         0x02   ;D31E                    ; the next 2 bytes

   173         0x00   ;D31F                    ; frame-count

   174         0x00   ;D320                    ; v-blank-prev

   175         

   176         0xFA   ;D321

   177         0x41   ;D322                    ; load (FF41) into A

   178         0xFF   ;D323                    ; this contains mode flags

   179         

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

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

   182         0xCB   ;D324                     ; test bit-1 of A

   183         0x4F   ;D325                         

   184 

   185         0xC2   ;D326                     ; if bit-1 is not 0

   186         0x44   ;D327                     ; GOTO not-v-blank

   187         0xD3   ;D328

   188         

   189         0xCB   ;D329                     ; test bit-0 of A 

   190         0x47   ;D32A

   191 

   192         0xCA   ;D32B                     ; if bit-0 is not 1

   193         0x44   ;D32C                     ; GOTO not-v-blank

   194         0xD3   ;D32D

   195         ;;; in v-blank mode

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

   197            ;; increment frame-count

   198 

   199         0xFA   ;D32E                    ; load v-blank-prev to A

   200         0x20   ;D32F

   201         0xD3   ;D330

   202         

   203         0xCB   ;D331

   204         0x47   ;D332                    ; test bit-0 of A 

   205 

   206         0x20   ;D333                    ; skip next section

   207         0x07   ;D334                    ; if v-blank-prev was not zero 

   208         

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

   210         0xFA   ;D335                    ; load frame-count into A

   211         0x1F   ;D336

   212         0xD3   ;D337                   

   213 

   214         0x3C   ;D338                    ; inc A

   215 

   216         0xEA   ;D339                    ; load A into frame-count

   217         0x1F   ;D33A

   218         0xD3   ;D33B

   219 

   220            ;; set v-blank-prev to 1

   221         0x3E   ;D33C                    ; load 1 into A

   222         0x01   ;D33D                    

   223 

   224         0xEA   ;D33E                    ; load A into v-blank-prev

   225         0x20   ;D33F

   226         0xD3   ;D340

   227 

   228         0xC3   ;D341                   ; return to beginning

   229         0x1D   ;D342

   230         0xD3   ;D343

   231 

   232         ;;; not in v-blank mode

   233            ;; set v-blank-prev to 0

   234         0x3E   ;D344                    ; load 0 into A        

   235         0x00   ;D345

   236 

   237         0xEA   ;D346                    ; load A into v-blank-prev

   238         0x20   ;D347

   239         0xD3   ;D348

   240 

   241         0xC3   ;D349                   ; return to beginning

   242         0x1D   ;D34A

   243         0xD3   ;D34B

   244         ])))

   245 

   246 (defn step-count-frames []

   247   (-> (read-down-button)

   248       (info)

   249       (tick)  ;; skip over data section

   250       (info)  

   251       (view-register "Register A" A)

   252       (tick)  ;; load-data into A

   253       (view-register "Register A" A)

   254       (info)

   255       (view-memory 0xFF00)

   256       (tick) ;; load A into 0xFF00

   257       (view-memory 0xFF00)

   258       (info)

   259       (tick)

   260       (info)

   261       (tick)

   262       (info)

   263       (tick)

   264       (info)

   265       (tick)

   266       (info)

   267       (tick)

   268       (info)

   269       (tick)

   270       (print-inventory)))

   271 

   272 (defn test-count-frames []

   273   (= 255 (aget (memory ((apply comp (repeat 255 step))

   274                         (count-frames)))

   275                0xD31F)))

   276 

   277 ;; specs for main bootstrap program

   278 ;; starts in "mode-select" mode

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

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

   281 ;;   which selects one of up to eight modes

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

   283 ;;   the next two button presses indicates the start

   284 ;;   memory location which to which the bootstrap

   285 ;;   program will write.

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

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

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

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

   290 

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

   292 ;;   written, starting at the start position.

   293 

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

   295 ;;   start address in sequence.

   296 

   297 (defn input-number-assembly []

   298   [0x18   ;D31D                    ; jump over          

   299    0x02   ;D31E                    ; the next 2 bytes

   300    0x00   ;D31F                    ; frame-count

   301    0x00   ;D320                    ; v-blank-prev

   302    

   303    0xFA   ;D321

   304    0x41   ;D322                    ; load (FF41) into A

   305    0xFF   ;D323                    ; this contains mode flags

   306    

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

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

   309    0xCB   ;D324                     ; test bit-1 of A

   310    0x4F   ;D325                         

   311 

   312    0xC2   ;D326                     ; if bit-1 is not 0

   313    0x44   ;D327                     ; GOTO not-v-blank

   314    0xD3   ;D328

   315    

   316    0xCB   ;D329                     ; test bit-0 of A 

   317    0x47   ;D32A

   318 

   319    0xCA   ;D32B                     ; if bit-0 is not 1

   320    0x44   ;D32C                     ; GOTO not-v-blank

   321    0xD3   ;D32D

   322    

   323         ;;; in v-blank mode

   324 

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

   326    ;; increment frame-count

   327 

   328    0xFA   ;D32E                    ; load v-blank-prev to A

   329    0x20   ;D32F

   330    0xD3   ;D330

   331    

   332    0xCB   ;D331

   333    0x47   ;D332                    ; test bit-0 of A 

   334 

   335    0x20   ;D333                    ; skip next section

   336    0x07   ;D334                    ; if v-blank-prev was not zero 

   337    

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

   339    0xFA   ;D335                    ; load frame-count into A

   340    0x1F   ;D336

   341    0xD3   ;D337                   

   342 

   343    0x3C   ;D338                    ; inc A

   344 

   345    0xEA   ;D339                    ; load A into frame-count

   346    0x1F   ;D33A

   347    0xD3   ;D33B

   348 

   349    ;; set v-blank-prev to 1

   350    0x3E   ;D33C                    ; load 1 into A

   351    0x01   ;D33D                    

   352 

   353    0xEA   ;D33E                    ; load A into v-blank-prev

   354    0x20   ;D33F

   355    0xD3   ;D340

   356 

   357    0xC3   ;D341                   ; GOTO input handling code

   358    0x4E   ;D342

   359    0xD3   ;D343

   360 

   361         ;;; not in v-blank mode

   362    ;; set v-blank-prev to 0

   363    0x3E   ;D344                    ; load 0 into A        

   364    0x00   ;D345

   365 

   366    0xEA   ;D346                    ; load A into v-blank-prev

   367    0x20   ;D347

   368    0xD3   ;D348

   369 

   370    0xC3   ;D349                   ; return to beginning

   371    0x1D   ;D34A

   372    0xD3   ;D34B

   373 

   374    0x00   ;D34C                   ; these are here 

   375    0x00   ;D34D                   ; for glue

   376    

   377    

   378         ;;; calculate input number based on button presses

   379    0x18   ;D34E                    ;  skip next 3 bytes

   380    0x03   ;D34F

   381                                         ;D350

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

   383                                         ;D351

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

   385    0x00   ;D352                    ;  input-number

   386 

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

   388    

   389    0xFA   ;D353                    ; load (D350) into A

   390    0x50   ;D354      -->       

   391    0xD3   ;D355      -->  D31F     

   392    

   393    0xEA   ;D356                    ; load A, which is 

   394    0x00   ;D357      -->           ; 00010000, into FF00

   395    0xFF   ;D358      -->  FF00     

   396 

   397    0x06   ;D359

   398                                         ;D35A

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

   400    0xFA   ;D35B                    ; (FF00) -> A

   401    0x00   ;D35C                   

   402    0xFF   ;D35D

   403 

   404    0xCB   ;D35E                    ; swap nybbles on A

   405    0x37   ;D35F

   406    0xA0   ;D360                    ; (AND A B) -> A

   407    0x47   ;D361                    ; A -> B

   408 

   409    ;; select buttons store bottom bits in C

   410    

   411    0xFA   ;                        ; load (D351) into A

   412    0x51   ;          -->       

   413    0xD3   ;          -->  D31F     

   414    

   415    0xEA   ;                        ; load (A), which is 

   416    0x00   ;          -->           ; 00001000, into FF00

   417    0xFF   ;          -->  FF00     

   418 

   419    0x0E   ;    

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

   421 

   422    0xFA   ;                        ; (FF00) -> A

   423    0x00   ;                       

   424    0xFF   ;    

   425    

   426    0xA1   ;                        ; (AND A C) -> A

   427    0x4F   ;                        ; A -> C

   428 

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

   430    0x79   ;                        ; C -> A

   431    0xB0   ;                        ; (OR A B) -> A

   432    0x2F   ;                        ; negate A

   433 

   434    0xEA   ;                        ; store A into input-number

   435    0x52   ;

   436    0xD3   ;

   437 

   438    0xC3   ;                        ; return to beginning

   439    0x1D   ;    

   440    0xD3   ;    

   441    ])

   442 

   443 

   444 (defn print-pc [state]

   445   (println (format "PC: 0x%04X" (PC state)))

   446   state)

   447 

   448 (defn print-op [state]

   449   (println (format "OP: 0x%02X" (aget (memory state) (PC state))))

   450   state)

   451 

   452 (defn d-tick

   453   ([state]

   454   (-> state print-pc print-op tick)))

   455 

   456 (defn input-number []

   457   (-> (tick (mid-game))

   458       (IE! 0) ; disable interrupts

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

   460   

   461 (defn test-input-number

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

   463   []

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

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

   466 

   467 

   468     

   469 

   470 

   471 

   472 

   473 

   474 

   475 

   476 

   477 

   478 

   479 

   480 

   481 

   482 

   483 

   484 

   485 

   486 

   487 

   488 

   489 

   490 

   491 

   492 

   493 

   494 

   495 (defn write-memory-assembly*

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

   497   []

   498   [

   499    ;; --------- FRAME METRONOME

   500    0x00 ;; v-blank-prev D31D

   501 

   502    0xFA ;; load modes into A

   503    0x41

   504    0xFF

   505 

   506    0x47 ;; A -> B

   507    0xCB ;; rotate A

   508    0x2F

   509    0x2F ;; invert A

   510 

   511    0xA0

   512    0x47 ;; now B_0 contains (VB==1)

   513 

   514    0xFA ;; load v-blank-prev

   515    0x1D

   516    0xD3

   517 

   518    0x2F ;; complement v-blank-prev

   519    

   520    0xA0 ;; A & B --> A

   521    0x4F ;; now C_0 contains increment?

   522 

   523 

   524    0x78 ;; B->A

   525    

   526    0xEA ;; spit A --> vbprev

   527    0x1D

   528    0xD3

   529 

   530    0xCB   ;test C_0

   531    0x41

   532    0x20   ; JUMP ahead to button input if nonzero

   533    0x03

   534    0x18   ; JUMP  back to beginning

   535    0xE7

   536    

   537    ;; -------- GET BUTTON INPUT

   538    0x00 ;; var: which-input D336

   539         ;; prepare to select bits

   540 

   541    0x01 ;; load 0x0000 into BC

   542    0x00 

   543    0x00

   544    

   545    0x3E ;; load 0x20 into A

   546    0x20

   547 

   548    

   549    0xEA ;; load A into [FF00] ;; D33D

   550    0x00

   551    0xFF

   552 

   553    0xFA ;; load A from [FF00]

   554    0x00

   555    0xFF

   556 

   557    0xE6 ;; bitmask 00001111

   558    0x0F

   559    

   560    0xB0 ;; A or B --> A

   561 

   562    0xCB

   563    0x41 ;; test bit 0 of C

   564    0x20 ;; JUMP forward if 1

   565    0x08

   566 

   567    0x47 ;; A -> B

   568    0xCB ;; swap B nybbles

   569    0x30 

   570    0x0C ;; increment C

   571    0x3E ;; load 0x10 into A

   572    0x10

   573    0x18 ;; JUMP back to "load A into [FF00]" [20 steps?]

   574    0xEB

   575 

   576    ;; now A contains the pressed keys

   577    0xEA ;; copy keys to input-number [D336]

   578    0x39 

   579    0xD3

   580    0x18 ;;JUMP back to "beginning" [D31E]

   581    0xC7

   582    

   583    

   584    ]

   585   )

   586 

   587 (defn write-mem-dyl []

   588   (-> (tick (mid-game))

   589       (IE! 0)

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

   591 

   592 

   593 (defn dylan []

   594   (->

   595    (write-mem-dyl)

   596    (tick)

   597    (tick)

   598    (tick)

   599    (tick)

   600    (tick)

   601    (tick)

   602    (tick)

   603    (tick)

   604    (tick)

   605    (tick)

   606    (tick)

   607    (tick)

   608    (tick)

   609    (tick)

   610    (tick) ;; first loop

   611 

   612 

   613    (tick)

   614    (tick)

   615    (tick)

   616    (tick)

   617    (tick)

   618    (tick)

   619    (tick)

   620    (tick)

   621    (tick)

   622    (tick)

   623    (tick)

   624    (tick)

   625    (tick) ;; dpad bits

   626 

   627    (tick)

   628    (tick)

   629    (tick)

   630    (tick)

   631    (tick)

   632    (tick)

   633    (tick)

   634    (tick)

   635    (d-tick)

   636    

   637 

   638    

   639    (view-register "A" A)

   640    (view-register "B" B)

   641    (view-register "C" C)

   642    

   643    ))

   644 

   645 

   646 

   647 

   648 (defn d2 []

   649   (->

   650    (write-mem-dyl)

   651    (view-memory 0xD31F)

   652    step step step step step

   653    (view-memory 0xD31F)))

   654 

   655 

   656 

   657 

   658 

   659 

   660 

   661 

   662 

   663 

   664 

   665 

   666 

   667 

   668 

   669 

   670 

   671 

   672 

   673 

   674 (defn write-memory-assembly []

   675   [

   676    ;; Main Timing Loop

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

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

   679     

   680    0x18   ; D31D                  ; Variable declaration

   681    0x02   ; D31E                   

   682    0x00   ; D31F                  ; frame-count

   683    0x00   ; D320                  ; v-blank-prev 

   684    

   685    0xF0   ; D321                  ; load v-blank mode flags into A

   686    0x41

   687    0x00

   688 

   689 

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

   691    ;; bits in A are "01"

   692    0xCB   ; D324                  

   693    0x4F   ; D325                  

   694 

   695    0xC2   ; D326                  ; if bit-1 is not 0, then

   696    0x3E   ; D327                  ; GOTO non-v-blank.

   697    0xD3   ; D328                  

   698 

   699    0xCB   ; D329                  

   700    0x47   ; D32A                  

   701 

   702    0xCA   ; D32B                  ; if bit-0 is not 1, then

   703    0x3E   ; D32C                  ; GOTO non-v-blank.

   704    0xD3   ; D32D                  

   705 

   706    ;; V-Blank

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

   708 

   709    0xFA   ; D32E                  ; load v-bank-prev into A

   710    0x20   ; D32F                  

   711    0xD3   ; D330                  

   712 

   713    0xFE   ; D331                  ; compare A to 0. >--------\ 

   714    0x00   ; D332                                              \

   715                                   ;                           |

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

   717    0x3E   ; D333                  ; load 1 into A.            |

   718    0x01   ; D334                                              | 

   719                                   ;                           |

   720    0xEA   ; D335                  ; load A into v-blank-prev  |

   721    0x20   ; D336                                              |

   722    0xD3   ; D337                                              |

   723                                   ;                           /

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

   725    0xCA   ; D338                  ; if v-blank-prev 

   726    0x46   ; D339                  ;   was 0, 

   727    0xD3   ; D33A                  ; GOTO state-machine

   728 

   729    0xC3   ; D33B                  

   730    0x1D   ; D33C                  

   731    0xD3   ; D33D                  ; GOTO beginning

   732    ;; END V-blank

   733 

   734    ;; Non-V-Blank

   735    ;;   Set v-blank-prev to 0

   736    0x3E   ; D33E                  ; load 0 into A

   737    0x00   ; D33F                  

   738 

   739    0xEA   ; D340                  ; load A into v-blank-prev

   740    0x20   ; D341                  

   741    0xD3   ; D342

   742    

   743    0xC3   ; D343                  

   744    0x1D   ; D344                  

   745    0xD3   ; D345                  ; GOTO beginning

   746    ;; END Not-V-Blank

   747 

   748    

   749    ;; Main State Machine -- Input Section

   750    ;;   This is called once every frame.

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

   752    ;;   state transitions.

   753 

   754    ;; Increment frame-count

   755    0xFA   ; D346                  ; load frame-count into A

   756    0x1F   ; D347                  

   757    0xD3   ; D348

   758    

   759    0x3C   ; D349                  ; inc A

   760 

   761    0xEA   ; D34A                  

   762    0x1F   ; D34B                  ; load A into frame-count

   763    0xD3   ; D34C

   764 

   765    0x00   ; D34D                  ; glue :)

   766    

   767    0x18   ;D34E                    ;  skip next 3 bytes

   768    0x03   ;D34F

   769           ;D350

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

   771           ;D351

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

   773    0x00   ;D352                    ;  input-number

   774 

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

   776    

   777    0xFA   ;D353                    ; load (D350) into A

   778    0x50   ;D354      -->       

   779    0xD3   ;D355      -->  D350     

   780    

   781    0xE0   ;D356                    ; load (A), which is 

   782    0x00   ;D357      -->           ; 00010000, into FF00

   783    0x00   ;D358      -->  FF00     ;; NO-OP

   784 

   785    0x06   ;D359

   786           ;D35A

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

   788    0xF0   ;D35B                    ; (FF00) -> A

   789    0x00   ;D35C                   

   790    0x00   ;D35D                    ;; NO-OP

   791 

   792    0xCB   ;D35E                    ; swap nybbles on A

   793    0x37   ;D35F

   794    0xA0   ;D360                    ; (AND A B) -> A

   795    0x47   ;D361                    ; A -> B

   796 

   797    ;; select buttons; store bottom bits in C

   798    

   799    0xFA   ;D362                    ; load (D351) into A

   800    0x51   ;D363      -->       

   801    0xD3   ;D364      -->  D351     

   802    

   803    0xE0   ;D365                    ; load (A), which is 

   804    0x00   ;D366      -->           ; 00001000, into FF00

   805    0x00   ;D367      -->  FF00     ;; NO-OP

   806 

   807    0x0E   ;D368

   808           ;D369

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

   810 

   811    0xF0   ;D36A                    ; (FF00) -> A

   812    0x00   ;D36B                   

   813    0x00   ;D36C

   814    

   815    0xA1   ;D36D                    ; (AND A C) -> A

   816    0x4F   ;D36E                    ; A -> C

   817 

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

   819    0x79   ;D36F                    ; C -> A

   820    0xB0   ;D370                    ; (OR A B) -> A

   821    0x2F   ;D371                    ; negate A

   822 

   823    0xEA   ;D372                    ; store A into input-number

   824    0x52   ;D373

   825    0xD3   ;D374

   826 

   827    0x00   ;D375                  

   828    0x00   ;D376

   829    0x00   ;D377

   830    0x00   ;D378

   831    0x00   ;D379

   832    0x00   ;D37A

   833    0x00   ;D37B                   ; these are here because 

   834    0x00   ;D37C                   ; I messed up :(

   835    0x00   ;D37D

   836    0x00   ;D37E

   837    0x00   ;D37F

   838    

   839    ;; beginning of main state machine   

   840    0x18   ;D380                    ; Declaration of variables

   841    0x05   ;D381                    ;  5 variables:

   842    0x00   ;D382                    ;    current-mode

   843    0x00   ;D383                    ;    bytes-to-write

   844    0x00   ;D384                    ;    bytes-written

   845    0x00   ;D385                    ;    start-point-high

   846    0x00   ;D386                    ;    start-point-low

   847 

   848 

   849    ;; banch on current mode

   850    0xFA   ;D387                    ; load current-mode (0xD382)

   851    0x82   ;D388                    ; into A

   852    0xD3   ;D389

   853    0x00   ;D38A

   854 

   855 

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

   857    0xFE   ;D38B

   858    0x00   ;D38C                    ; compare A with 0x00

   859 

   860    0xCA   ;D38D                    ; goto Mode 0 if A == 0

   861    0xA8   ;D38E

   862    0xD3   ;D38F

   863 

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

   865    0xFE   ;D390

   866    0x01   ;D391                    ; compare A with 0x01

   867 

   868    0xCA   ;D392                  

   869    0xB1   ;D393 

   870    0xD3   ;D394                    ; goto Mode 1 if A == 1

   871 

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

   873    0xFE   ;D395                    

   874    0x02   ;D396                    ; compare A with 0x02

   875 

   876    0xCA   ;D397

   877    0xBF   ;D398

   878    0xD3   ;D399                    ; goto Mode 2 if A == 2

   879 

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

   881    0xFE   ;D39A

   882    0x03   ;D39B

   883 

   884    0xCA   ;D39C

   885    0xCD   ;D39D

   886    0xD3   ;D39E                    ; goto Mode 3 if A == 3

   887 

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

   889    0xFE   ;D39F

   890    0x04   ;D3A0

   891 

   892    0xCA   ;D3A1

   893    0xDB   ;D3A2

   894    0xD3   ;D3A3

   895 

   896    0x00   ;D3A4

   897    ;; End of Mode checking, goto beginning

   898    0xC3   ;D3A5

   899    0x1D   ;D3A6

   900    0xD3   ;D3A7

   901 

   902 

   903    ;; Mode 0 -- input-mode mode

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

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

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

   907 

   908    ;;   set current-mode to input-number

   909    0xFA   ;D3A8                    ; load input-number (0xD352) 

   910    0x52   ;D3A9                    ; into A

   911    0xD3   ;D3AA

   912 

   913    0xEA   ;D3AB                    ; load A into current-mode

   914    0x82   ;D3AC                    ; (0xD382)

   915    0xD3   ;D3AD

   916 

   917    0xC3   ;D3AE                    ; go back to beginning

   918    0x1D   ;D3AF

   919    0xD3   ;D3B0

   920    ;; End Mode 0

   921 

   922 

   923    ;; Mode 1 -- set-length mode

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

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

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

   927    ;;      completes.

   928 

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

   930    ;;      set current-mode to 0x02.

   931    0xFA   ;D3B1                   ; load input-number (0xD352)

   932    0x52   ;D3B2                   ; into A

   933    0xD3   ;D3B3

   934    

   935    0xEA   ;D3B4                   ; load A into bytes-left-to-write

   936    0x83   ;D3B5                   ; (0xD383)

   937    0xD3   ;D3B6

   938 

   939    0x3E   ;D3B7                   ; load 0x02 into A.

   940    0x02   ;D3B8

   941    

   942    0xEA   ;D3B9                   ; load A to current-mode

   943    0x82   ;D3BA                   ; advancing from Mode 1 to 

   944    0xD3   ;D3BB                   ; Mode 2

   945    

   946    0xC3   ;D3BC                   ; go back to beginning

   947    0x1D   ;D3BD

   948    0xD3   ;D3BE

   949    ;; End Mode 1

   950 

   951 

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

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

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

   955    ;;      data will be written.

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

   957 

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

   959    ;;      set current mode to 0x03.

   960    0xFA   ;D3BF                   ; load input-number (0xD352)

   961    0x52   ;D3C0                   ; into A

   962    0xD3   ;D3C1

   963 

   964    0xEA   ;D3C2                   ; load A into start-point-high

   965    0x85   ;D3C3                   ; (0xD385)

   966    0xD3   ;D3C4

   967 

   968    0x3E   ;D3C5                   ; load 0x03 into A.

   969    0x03   ;D3C6

   970 

   971    0xEA   ;D3C7                   ; load A to current-mode,

   972    0x82   ;D3C8                   ; advancing from Mode 2 to 

   973    0xD3   ;D3C9                   ; Mode 3.

   974    

   975    0xC3   ;D3CA                   ; go back to beginning

   976    0x1D   ;D3CB

   977    0xD3   ;D3CC

   978    ;;End Mode 2

   979 

   980 

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

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

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

   984 

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

   986    ;;      set current mode to 0x04

   987    0xFA   ;D3CD                   ; load input-number into A

   988    0x52   ;D3CE                   

   989    0xD3   ;D3CF                   

   990 

   991    0xEA   ;D3D0                   ; load A into start-point-low

   992    0x86   ;D3D1                   

   993    0xD3   ;D3D2                   

   994 

   995    0x3E   ;D3D3                   ; load 0x04 into A.

   996    0x04   ;D3D4                   

   997 

   998    0xEA   ;D3D5                   ; load A to current-mode,

   999    0x82   ;D3D6                   ; advancing from Mode 3 to 

  1000    0xD3   ;D3D7                   ; Mode 4.

  1001 

  1002    0xC3   ;D3D8                   ; go back to beginning

  1003    0x1D   ;D3D9                   

  1004    0xD3   ;D3DA                   

  1005    

  1006    ;; Mode 4 -- write bytes mode

  1007 

  1008    ;;      This is where RAM manipulation happens.  User supplies

  1009    ;;      bytes every frame, which are written sequentially to

  1010    ;;      start-point until bytes-to-write have been written. Once

  1011    ;;      bytes-to-write have been written, the mode is reset to 0.

  1012 

  1013    ;;   compare bytes-written with bytes-to-write.

  1014    ;;   if they are the same, then reset mode to 0

  1015   

  1016    0xFA   ;D3DB                   ; load bytes-to-write into A

  1017    0x83   ;D3DC

  1018    0xD3   ;D3DD

  1019 

  1020    0x47   ;D3DE                   ; load A into B

  1021 

  1022    0xFA   ;D3DF                   ; load bytes-written into A

  1023    0x84   ;D3E0

  1024    0xD3   ;D3E1

  1025 

  1026    0xB8   ;D3E2                   ; compare A with B

  1027 

  1028    0xCA   ;D3E3                   ; if they are equal, go to cleanup

  1029    0x07   ;D3E4                   

  1030    0xD4   ;D3E5                   

  1031 

  1032    ;;  Write Memory Section

  1033    ;;    Write the input-number, interpreted as an 8-bit number,

  1034    ;;    into the current target register, determined by

  1035    ;;    (+ start-point bytes-written).

  1036    ;;    Then, increment bytes-written by 1.

  1037    

  1038    0xFA   ;D3E6                   ; load start-point-high into A

  1039    0x85   ;D3E7                   

  1040    0xD3   ;D3E8                   

  1041 

  1042    0x67   ;D3E9                   ; load A into H

  1043 

  1044    0xFA   ;D3EA                   ; load start-point-low into A

  1045    0x86   ;D3EB                   

  1046    0xD3   ;D3EC

  1047    

  1048    0x6F   ;D3ED                   ; load A into L

  1049    

  1050    0xFA   ;D3EE                   ; load bytes-written into A

  1051    0x84   ;D3EF                   

  1052    0xD3   ;D3F0                   

  1053    

  1054    0x00   ;D3F1                   ; These are here because

  1055    0x00   ;D3F2                   ; I screwed up again.

  1056    0x00   ;D3F3                   

  1057 

  1058    0x85   ;D3F4                   ; add L to A; store A in L.

  1059    0x6F   ;D3F5                   

  1060 

  1061    0x30   ;D3F6                   ; If the addition overflowed,

  1062    0x01   ;D3F7                   

  1063    0x24   ;D3F8                   ; increment H.

  1064 

  1065    ;;   Now, HL points to the correct place in memory

  1066    

  1067    0xFA   ;D3F9                   ; load input-number into A

  1068    0x52   ;D3FA                   

  1069    0xD3   ;D3FB                   

  1070 

  1071    0x77   ;D3FC                   ; load A into (HL)

  1072 

  1073    0xFA   ;D3FD                   ; load bytes-written into A

  1074    0x84   ;D3FE                   

  1075    0xD3   ;D3FF                   

  1076 

  1077    0x3C   ;D400                   ; increment A

  1078 

  1079    0xEA   ;D401                   ; load A into bytes-written

  1080    0x84   ;D402                   

  1081    0xD3   ;D403

  1082 

  1083    0xC3   ;D404                   ; go back to beginning.

  1084    0x1D   ;D405

  1085    0xD3   ;D406

  1086    ;;  End Write Memory Section

  1087 

  1088    ;;  Mode 4 Cleanup Section

  1089    ;;    reset bytes-written to 0

  1090    ;;    set mode to 0

  1091    0x3E   ;D407                   ; load 0 into A

  1092    0x00   ;D408                  

  1093 

  1094    0xEA   ;D409                   ; load A into bytes-written

  1095    0x84   ;D40A                   

  1096    0xD3   ;D40B                   

  1097 

  1098    0xEA   ;D40C                   ; load A into current-mode

  1099    0x82   ;D40D                   

  1100    0xD3   ;D40E                   

  1101 

  1102    0xC3   ;D40F                    ; go back to beginning

  1103    0x1D   ;D410

  1104    0xD3   ;D411

  1105 

  1106    ;; End Mode 4

  1107    

  1108    ])

  1109 

  1110 

  1111 

  1112 (def frame-count 0xD31F)

  1113 (def input 0xD352)

  1114 (def current-mode      0xD382)

  1115 (def bytes-to-write    0xD383)

  1116 (def bytes-written     0xD384)

  1117 (def start-point-high  0xD385)

  1118 (def start-point-low   0xD386)

  1119 

  1120 

  1121 

  1122 (defn write-memory []

  1123   (-> (tick (mid-game))

  1124       (IE! 0) ; disable interrupts

  1125       (inject-item-assembly (write-memory-assembly))))

  1126 

  1127 (defn test-write-memory []

  1128   (set-state! (write-memory))

  1129   (dorun

  1130    (dotimes [_ 5000]

  1131      (view-memory (step @current-state) current-mode))))

  1132 

  1133 (def bytes-to-write 0xD383)

  1134 (def start-point 0xD384)

  1135 

  1136 (defn print-blank-assembly

  1137   [start end]

  1138   (dorun

  1139    (map

  1140     #(println (format "0x00   ;%04X                   " %))

  1141     (range start end))))

  1142 

  1143 (defn test-mode-2 []

  1144   (->

  1145    (write-memory)

  1146    (view-memory frame-count)

  1147    (step)

  1148    (step [:a])

  1149    (step [:b])

  1150    (step [:start])

  1151    (step [])

  1152    (view-memory frame-count)))

  1153 

  1154 (defn test-mode-4

  1155   ([] (test-mode-4 (write-memory)))

  1156   ([target-state]

  1157      (->

  1158       target-state

  1159       (#(do (println "memory from 0xC00F to 0xC01F:"

  1160                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %))

  1161       (view-memory current-mode)

  1162       (step [])

  1163       (step [])

  1164       (step [])

  1165       (#(do (println "after three steps") %))

  1166       (view-memory current-mode)

  1167 

  1168       ;; Activate memory writing mode

  1169       

  1170       (#(do (println "step with [:a]") %))

  1171       (step [:a])

  1172       (view-memory current-mode)

  1173       (view-memory bytes-to-write)

  1174       (view-memory start-point-high)

  1175       (view-memory start-point-low)

  1176 

  1177       ;; Specify four bytes to be written

  1178       

  1179       (#(do (println "step with [:select]")%))

  1180       (step [:select])

  1181       (view-memory current-mode)

  1182       (view-memory bytes-to-write)

  1183       (view-memory start-point-high)

  1184       (view-memory start-point-low)

  1185 

  1186       ;; Specify target memory address as 0xC00F

  1187       

  1188       (#(do (println "step with [:u :d]")%))

  1189       (step [:u :d])

  1190       (view-memory current-mode)

  1191       (view-memory bytes-to-write)

  1192       (view-memory start-point-high)

  1193       (view-memory start-point-low)

  1194 

  1195       (#(do (println "step with [:a :b :start :select]")%))

  1196       (step [:a :b :start :select])

  1197       (view-memory current-mode)

  1198       (view-memory bytes-to-write)

  1199       (view-memory start-point-high)

  1200       (view-memory start-point-low)

  1201 

  1202       ;; Start reprogramming memory

  1203 

  1204       (#(do (println "step with [:a]")%))

  1205       (step [:a])

  1206       (view-memory current-mode)

  1207       (view-memory bytes-written)

  1208 

  1209       (#(do (println "step with [:b]")%))

  1210       (step [:b])

  1211       (view-memory current-mode)

  1212       (view-memory bytes-written)

  1213 

  1214       (#(do (println "step with [:a :b]")%))

  1215       (step [:a :b])

  1216       (view-memory current-mode)

  1217       (view-memory bytes-written)

  1218 

  1219       (#(do (println "step with [:select]")%))

  1220       (step [:select])

  1221       (view-memory current-mode)

  1222       (view-memory bytes-written)

  1223 

  1224       ;; Reprogramming done, program ready for more commands.

  1225 

  1226       (#(do (println "step with []")%))

  1227       (step [])

  1228       (view-memory current-mode)

  1229       (view-memory bytes-written)

  1230       

  1231       (#(do (println "memory from 0xC00F to 0xC01F:"

  1232                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %)))))

  1233
author	Dylan Holmes <ocsenave@gmail.com>
date	Sun, 18 Mar 2012 05:53:25 -0500
parents	eb6ba88088d3
children	1c58fa3cfc68