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   [

   497    ;; --------- FRAME METRONOME

   498    

   499    0x18 ;; D31D

   500    0x01

   501    0x00 ;; v-blank-prev D31F

   502 

   503    0xFA ;; load modes into A

   504    0x41

   505    0xFF

   506 

   507    0x47 ;; A -> B

   508    0xCB ;; rotate A

   509    0x2F

   510    0x2F ;; invert A

   511 

   512    0xA0

   513    0x47 ;; now B_0 contains (VB==1)

   514 

   515    0xFA ;; load v-blank-prev

   516    0x1F

   517    0xD3

   518 

   519    0x2F ;; complement v-blank-prev

   520    

   521    0xA0 ;; A & B --> A

   522    0x4F ;; now C_0 contains increment?

   523 

   524 

   525    0x78 ;; B->A

   526    

   527    0xEA ;; spit A --> vbprev

   528    0x1F

   529    0xD3

   530 

   531    0x41   ;test C_0

   532    0x20   ; nonzero jump

   533    0x04

   534    

   535    0xC3   ;                    ; go back to beginning

   536    0x1D   ;

   537    0xD3   ;

   538    

   539    ;; -------- GET BUTTON INPUT

   540    0x00 ;; var: which-input D339

   541         ;; prepare to select bits

   542 

   543    0x01 ;; load 0x0000 into BC

   544    0x00 

   545    0x00

   546    

   547    0x3E ;; load 0x20 into A

   548    0x20

   549 

   550    

   551    0xEA ;; load A into [FF00] ;; D33F (not D33C)

   552    0x00

   553    0xFF

   554 

   555    0xFA ;; load A from [FF00]

   556    0x00

   557    0xFF

   558 

   559    0xE6 ;; bitmask 00001111

   560    0x0F

   561    

   562    0xB0 ;; A or B --> A

   563 

   564    0xCB

   565    0x41 ;; test bit 0 of C

   566    0x20 ;; jump forward if 1

   567    0x08

   568 

   569    0x47 ;; A -> B

   570    0xCB ;; swap B nybbles

   571    0x30 

   572    0x0C ;; increment C

   573    0x3E ;; load 0x10 into A

   574    0x10

   575    0x18 ;; JUMP back to "load A into [FF00]" [20 steps?]

   576    0xEB

   577 

   578    ;; now A contains the pressed keys

   579    0xEA ;; copy keys to input-number [D339]

   580    0x39 

   581    0xD3

   582    0x18 ;;

   583    0xEB

   584    

   585    

   586    ]

   587   )

   588 

   589 (defn write-mem-dyl []

   590   (-> (tick (mid-game))

   591       (IE! 0)

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

   593 

   594 

   595 (defn dylan []

   596   (->

   597    (write-mem-dyl)

   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)

   611    (tick)

   612    (tick)

   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)

   626 

   627    

   628    (d-tick)

   629 

   630    

   631    (view-register "A" A)

   632    (view-register "B" B)

   633    (view-register "C" C)

   634    

   635    ))

   636 

   637 

   638 

   639 

   640 (defn d2 []

   641   (->

   642    (write-mem-dyl)

   643    (view-memory 0xD31F)

   644    step step step step step

   645    (view-memory 0xD31F)))

   646 

   647 

   648 

   649 

   650 

   651 

   652 

   653 

   654 

   655 

   656 

   657 

   658 

   659 

   660 

   661 

   662 

   663 

   664 

   665 

   666 (defn write-memory-assembly []

   667   [

   668    ;; Main Timing Loop

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

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

   671     

   672    0x18   ; D31D                  ; Variable declaration

   673    0x02   ; D31E                   

   674    0x00   ; D31F                  ; frame-count

   675    0x00   ; D320                  ; v-blank-prev 

   676    

   677    0xF0   ; D321                  ; load v-blank mode flags into A

   678    0x41

   679    0x00

   680 

   681 

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

   683    ;; bits in A are "01"

   684    0xCB   ; D324                  

   685    0x4F   ; D325                  

   686 

   687    0xC2   ; D326                  ; if bit-1 is not 0, then

   688    0x3E   ; D327                  ; GOTO non-v-blank.

   689    0xD3   ; D328                  

   690 

   691    0xCB   ; D329                  

   692    0x47   ; D32A                  

   693 

   694    0xCA   ; D32B                  ; if bit-0 is not 1, then

   695    0x3E   ; D32C                  ; GOTO non-v-blank.

   696    0xD3   ; D32D                  

   697 

   698    ;; V-Blank

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

   700 

   701    0xFA   ; D32E                  ; load v-bank-prev into A

   702    0x20   ; D32F                  

   703    0xD3   ; D330                  

   704 

   705    0xFE   ; D331                  ; compare A to 0. >--------\ 

   706    0x00   ; D332                                              \

   707                                   ;                           |

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

   709    0x3E   ; D333                  ; load 1 into A.            |

   710    0x01   ; D334                                              | 

   711                                   ;                           |

   712    0xEA   ; D335                  ; load A into v-blank-prev  |

   713    0x20   ; D336                                              |

   714    0xD3   ; D337                                              |

   715                                   ;                           /

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

   717    0xCA   ; D338                  ; if v-blank-prev 

   718    0x46   ; D339                  ;   was 0, 

   719    0xD3   ; D33A                  ; GOTO state-machine

   720 

   721    0xC3   ; D33B                  

   722    0x1D   ; D33C                  

   723    0xD3   ; D33D                  ; GOTO beginning

   724    ;; END V-blank

   725 

   726    ;; Non-V-Blank

   727    ;;   Set v-blank-prev to 0

   728    0x3E   ; D33E                  ; load 0 into A

   729    0x00   ; D33F                  

   730 

   731    0xEA   ; D340                  ; load A into v-blank-prev

   732    0x20   ; D341                  

   733    0xD3   ; D342

   734    

   735    0xC3   ; D343                  

   736    0x1D   ; D344                  

   737    0xD3   ; D345                  ; GOTO beginning

   738    ;; END Not-V-Blank

   739 

   740    

   741    ;; Main State Machine -- Input Section

   742    ;;   This is called once every frame.

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

   744    ;;   state transitions.

   745 

   746    ;; Increment frame-count

   747    0xFA   ; D346                  ; load frame-count into A

   748    0x1F   ; D347                  

   749    0xD3   ; D348

   750    

   751    0x3C   ; D349                  ; inc A

   752 

   753    0xEA   ; D34A                  

   754    0x1F   ; D34B                  ; load A into frame-count

   755    0xD3   ; D34C

   756 

   757    0x00   ; D34D                  ; glue :)

   758    

   759    0x18   ;D34E                    ;  skip next 3 bytes

   760    0x03   ;D34F

   761           ;D350

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

   763           ;D351

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

   765    0x00   ;D352                    ;  input-number

   766 

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

   768    

   769    0xFA   ;D353                    ; load (D350) into A

   770    0x50   ;D354      -->       

   771    0xD3   ;D355      -->  D350     

   772    

   773    0xE0   ;D356                    ; load (A), which is 

   774    0x00   ;D357      -->           ; 00010000, into FF00

   775    0x00   ;D358      -->  FF00     ;; NO-OP

   776 

   777    0x06   ;D359

   778           ;D35A

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

   780    0xF0   ;D35B                    ; (FF00) -> A

   781    0x00   ;D35C                   

   782    0x00   ;D35D                    ;; NO-OP

   783 

   784    0xCB   ;D35E                    ; swap nybbles on A

   785    0x37   ;D35F

   786    0xA0   ;D360                    ; (AND A B) -> A

   787    0x47   ;D361                    ; A -> B

   788 

   789    ;; select buttons; store bottom bits in C

   790    

   791    0xFA   ;D362                    ; load (D351) into A

   792    0x51   ;D363      -->       

   793    0xD3   ;D364      -->  D351     

   794    

   795    0xE0   ;D365                    ; load (A), which is 

   796    0x00   ;D366      -->           ; 00001000, into FF00

   797    0x00   ;D367      -->  FF00     ;; NO-OP

   798 

   799    0x0E   ;D368

   800           ;D369

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

   802 

   803    0xF0   ;D36A                    ; (FF00) -> A

   804    0x00   ;D36B                   

   805    0x00   ;D36C

   806    

   807    0xA1   ;D36D                    ; (AND A C) -> A

   808    0x4F   ;D36E                    ; A -> C

   809 

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

   811    0x79   ;D36F                    ; C -> A

   812    0xB0   ;D370                    ; (OR A B) -> A

   813    0x2F   ;D371                    ; negate A

   814 

   815    0xEA   ;D372                    ; store A into input-number

   816    0x52   ;D373

   817    0xD3   ;D374

   818 

   819    0x00   ;D375                  

   820    0x00   ;D376

   821    0x00   ;D377

   822    0x00   ;D378

   823    0x00   ;D379

   824    0x00   ;D37A

   825    0x00   ;D37B                   ; these are here because 

   826    0x00   ;D37C                   ; I messed up :(

   827    0x00   ;D37D

   828    0x00   ;D37E

   829    0x00   ;D37F

   830    

   831    ;; beginning of main state machine   

   832    0x18   ;D380                    ; Declaration of variables

   833    0x05   ;D381                    ;  5 variables:

   834    0x00   ;D382                    ;    current-mode

   835    0x00   ;D383                    ;    bytes-to-write

   836    0x00   ;D384                    ;    bytes-written

   837    0x00   ;D385                    ;    start-point-high

   838    0x00   ;D386                    ;    start-point-low

   839 

   840 

   841    ;; banch on current mode

   842    0xFA   ;D387                    ; load current-mode (0xD382)

   843    0x82   ;D388                    ; into A

   844    0xD3   ;D389

   845    0x00   ;D38A

   846 

   847 

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

   849    0xFE   ;D38B

   850    0x00   ;D38C                    ; compare A with 0x00

   851 

   852    0xCA   ;D38D                    ; goto Mode 0 if A == 0

   853    0xA8   ;D38E

   854    0xD3   ;D38F

   855 

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

   857    0xFE   ;D390

   858    0x01   ;D391                    ; compare A with 0x01

   859 

   860    0xCA   ;D392                  

   861    0xB1   ;D393 

   862    0xD3   ;D394                    ; goto Mode 1 if A == 1

   863 

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

   865    0xFE   ;D395                    

   866    0x02   ;D396                    ; compare A with 0x02

   867 

   868    0xCA   ;D397

   869    0xBF   ;D398

   870    0xD3   ;D399                    ; goto Mode 2 if A == 2

   871 

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

   873    0xFE   ;D39A

   874    0x03   ;D39B

   875 

   876    0xCA   ;D39C

   877    0xCD   ;D39D

   878    0xD3   ;D39E                    ; goto Mode 3 if A == 3

   879 

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

   881    0xFE   ;D39F

   882    0x04   ;D3A0

   883 

   884    0xCA   ;D3A1

   885    0xDB   ;D3A2

   886    0xD3   ;D3A3

   887 

   888    0x00   ;D3A4

   889    ;; End of Mode checking, goto beginning

   890    0xC3   ;D3A5

   891    0x1D   ;D3A6

   892    0xD3   ;D3A7

   893 

   894 

   895    ;; Mode 0 -- input-mode mode

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

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

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

   899 

   900    ;;   set current-mode to input-number

   901    0xFA   ;D3A8                    ; load input-number (0xD352) 

   902    0x52   ;D3A9                    ; into A

   903    0xD3   ;D3AA

   904 

   905    0xEA   ;D3AB                    ; load A into current-mode

   906    0x82   ;D3AC                    ; (0xD382)

   907    0xD3   ;D3AD

   908 

   909    0xC3   ;D3AE                    ; go back to beginning

   910    0x1D   ;D3AF

   911    0xD3   ;D3B0

   912    ;; End Mode 0

   913 

   914 

   915    ;; Mode 1 -- set-length mode

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

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

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

   919    ;;      completes.

   920 

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

   922    ;;      set current-mode to 0x02.

   923    0xFA   ;D3B1                   ; load input-number (0xD352)

   924    0x52   ;D3B2                   ; into A

   925    0xD3   ;D3B3

   926    

   927    0xEA   ;D3B4                   ; load A into bytes-left-to-write

   928    0x83   ;D3B5                   ; (0xD383)

   929    0xD3   ;D3B6

   930 

   931    0x3E   ;D3B7                   ; load 0x02 into A.

   932    0x02   ;D3B8

   933    

   934    0xEA   ;D3B9                   ; load A to current-mode

   935    0x82   ;D3BA                   ; advancing from Mode 1 to 

   936    0xD3   ;D3BB                   ; Mode 2

   937    

   938    0xC3   ;D3BC                   ; go back to beginning

   939    0x1D   ;D3BD

   940    0xD3   ;D3BE

   941    ;; End Mode 1

   942 

   943 

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

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

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

   947    ;;      data will be written.

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

   949 

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

   951    ;;      set current mode to 0x03.

   952    0xFA   ;D3BF                   ; load input-number (0xD352)

   953    0x52   ;D3C0                   ; into A

   954    0xD3   ;D3C1

   955 

   956    0xEA   ;D3C2                   ; load A into start-point-high

   957    0x85   ;D3C3                   ; (0xD385)

   958    0xD3   ;D3C4

   959 

   960    0x3E   ;D3C5                   ; load 0x03 into A.

   961    0x03   ;D3C6

   962 

   963    0xEA   ;D3C7                   ; load A to current-mode,

   964    0x82   ;D3C8                   ; advancing from Mode 2 to 

   965    0xD3   ;D3C9                   ; Mode 3.

   966    

   967    0xC3   ;D3CA                   ; go back to beginning

   968    0x1D   ;D3CB

   969    0xD3   ;D3CC

   970    ;;End Mode 2

   971 

   972 

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

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

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

   976 

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

   978    ;;      set current mode to 0x04

   979    0xFA   ;D3CD                   ; load input-number into A

   980    0x52   ;D3CE                   

   981    0xD3   ;D3CF                   

   982 

   983    0xEA   ;D3D0                   ; load A into start-point-low

   984    0x86   ;D3D1                   

   985    0xD3   ;D3D2                   

   986 

   987    0x3E   ;D3D3                   ; load 0x04 into A.

   988    0x04   ;D3D4                   

   989 

   990    0xEA   ;D3D5                   ; load A to current-mode,

   991    0x82   ;D3D6                   ; advancing from Mode 3 to 

   992    0xD3   ;D3D7                   ; Mode 4.

   993 

   994    0xC3   ;D3D8                   ; go back to beginning

   995    0x1D   ;D3D9                   

   996    0xD3   ;D3DA                   

   997    

   998    ;; Mode 4 -- write bytes mode

   999 

  1000    ;;      This is where RAM manipulation happens.  User supplies

  1001    ;;      bytes every frame, which are written sequentially to

  1002    ;;      start-point until bytes-to-write have been written. Once

  1003    ;;      bytes-to-write have been written, the mode is reset to 0.

  1004 

  1005    ;;   compare bytes-written with bytes-to-write.

  1006    ;;   if they are the same, then reset mode to 0

  1007   

  1008    0xFA   ;D3DB                   ; load bytes-to-write into A

  1009    0x83   ;D3DC

  1010    0xD3   ;D3DD

  1011 

  1012    0x47   ;D3DE                   ; load A into B

  1013 

  1014    0xFA   ;D3DF                   ; load bytes-written into A

  1015    0x84   ;D3E0

  1016    0xD3   ;D3E1

  1017 

  1018    0xB8   ;D3E2                   ; compare A with B

  1019 

  1020    0xCA   ;D3E3                   ; if they are equal, go to cleanup

  1021    0x07   ;D3E4                   

  1022    0xD4   ;D3E5                   

  1023 

  1024    ;;  Write Memory Section

  1025    ;;    Write the input-number, interpreted as an 8-bit number,

  1026    ;;    into the current target register, determined by

  1027    ;;    (+ start-point bytes-written).

  1028    ;;    Then, increment bytes-written by 1.

  1029    

  1030    0xFA   ;D3E6                   ; load start-point-high into A

  1031    0x85   ;D3E7                   

  1032    0xD3   ;D3E8                   

  1033 

  1034    0x67   ;D3E9                   ; load A into H

  1035 

  1036    0xFA   ;D3EA                   ; load start-point-low into A

  1037    0x86   ;D3EB                   

  1038    0xD3   ;D3EC

  1039    

  1040    0x6F   ;D3ED                   ; load A into L

  1041    

  1042    0xFA   ;D3EE                   ; load bytes-written into A

  1043    0x84   ;D3EF                   

  1044    0xD3   ;D3F0                   

  1045    

  1046    0x00   ;D3F1                   ; These are here because

  1047    0x00   ;D3F2                   ; I screwed up again.

  1048    0x00   ;D3F3                   

  1049 

  1050    0x85   ;D3F4                   ; add L to A; store A in L.

  1051    0x6F   ;D3F5                   

  1052 

  1053    0x30   ;D3F6                   ; If the addition overflowed,

  1054    0x01   ;D3F7                   

  1055    0x24   ;D3F8                   ; increment H.

  1056 

  1057    ;;   Now, HL points to the correct place in memory

  1058    

  1059    0xFA   ;D3F9                   ; load input-number into A

  1060    0x52   ;D3FA                   

  1061    0xD3   ;D3FB                   

  1062 

  1063    0x77   ;D3FC                   ; load A into (HL)

  1064 

  1065    0xFA   ;D3FD                   ; load bytes-written into A

  1066    0x84   ;D3FE                   

  1067    0xD3   ;D3FF                   

  1068 

  1069    0x3C   ;D400                   ; increment A

  1070 

  1071    0xEA   ;D401                   ; load A into bytes-written

  1072    0x84   ;D402                   

  1073    0xD3   ;D403

  1074 

  1075    0xC3   ;D404                   ; go back to beginning.

  1076    0x1D   ;D405

  1077    0xD3   ;D406

  1078    ;;  End Write Memory Section

  1079 

  1080    ;;  Mode 4 Cleanup Section

  1081    ;;    reset bytes-written to 0

  1082    ;;    set mode to 0

  1083    0x3E   ;D407                   ; load 0 into A

  1084    0x00   ;D408                  

  1085 

  1086    0xEA   ;D409                   ; load A into bytes-written

  1087    0x84   ;D40A                   

  1088    0xD3   ;D40B                   

  1089 

  1090    0xEA   ;D40C                   ; load A into current-mode

  1091    0x82   ;D40D                   

  1092    0xD3   ;D40E                   

  1093 

  1094    0xC3   ;D40F                    ; go back to beginning

  1095    0x1D   ;D410

  1096    0xD3   ;D411

  1097 

  1098    ;; End Mode 4

  1099    

  1100    ])

  1101 

  1102 

  1103 

  1104 (def frame-count 0xD31F)

  1105 (def input 0xD352)

  1106 (def current-mode      0xD382)

  1107 (def bytes-to-write    0xD383)

  1108 (def bytes-written     0xD384)

  1109 (def start-point-high  0xD385)

  1110 (def start-point-low   0xD386)

  1111 

  1112 

  1113 

  1114 (defn write-memory []

  1115   (-> (tick (mid-game))

  1116       (IE! 0) ; disable interrupts

  1117       (inject-item-assembly (write-memory-assembly))))

  1118 

  1119 (defn test-write-memory []

  1120   (set-state! (write-memory))

  1121   (dorun

  1122    (dotimes [_ 5000]

  1123      (view-memory (step @current-state) current-mode))))

  1124 

  1125 (def bytes-to-write 0xD383)

  1126 (def start-point 0xD384)

  1127 

  1128 (defn print-blank-assembly

  1129   [start end]

  1130   (dorun

  1131    (map

  1132     #(println (format "0x00   ;%04X                   " %))

  1133     (range start end))))

  1134 

  1135 (defn test-mode-2 []

  1136   (->

  1137    (write-memory)

  1138    (view-memory frame-count)

  1139    (step)

  1140    (step [:a])

  1141    (step [:b])

  1142    (step [:start])

  1143    (step [])

  1144    (view-memory frame-count)))

  1145 

  1146 (defn test-mode-4

  1147   ([] (test-mode-4 (write-memory)))

  1148   ([target-state]

  1149      (->

  1150       target-state

  1151       (#(do (println "memory from 0xC00F to 0xC01F:"

  1152                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %))

  1153       (view-memory current-mode)

  1154       (step [])

  1155       (step [])

  1156       (step [])

  1157       (#(do (println "after three steps") %))

  1158       (view-memory current-mode)

  1159 

  1160       ;; Activate memory writing mode

  1161       

  1162       (#(do (println "step with [:a]") %))

  1163       (step [:a])

  1164       (view-memory current-mode)

  1165       (view-memory bytes-to-write)

  1166       (view-memory start-point-high)

  1167       (view-memory start-point-low)

  1168 

  1169       ;; Specify four bytes to be written

  1170       

  1171       (#(do (println "step with [:select]")%))

  1172       (step [:select])

  1173       (view-memory current-mode)

  1174       (view-memory bytes-to-write)

  1175       (view-memory start-point-high)

  1176       (view-memory start-point-low)

  1177 

  1178       ;; Specify target memory address as 0xC00F

  1179       

  1180       (#(do (println "step with [:u :d]")%))

  1181       (step [:u :d])

  1182       (view-memory current-mode)

  1183       (view-memory bytes-to-write)

  1184       (view-memory start-point-high)

  1185       (view-memory start-point-low)

  1186 

  1187       (#(do (println "step with [:a :b :start :select]")%))

  1188       (step [:a :b :start :select])

  1189       (view-memory current-mode)

  1190       (view-memory bytes-to-write)

  1191       (view-memory start-point-high)

  1192       (view-memory start-point-low)

  1193 

  1194       ;; Start reprogramming memory

  1195 

  1196       (#(do (println "step with [:a]")%))

  1197       (step [:a])

  1198       (view-memory current-mode)

  1199       (view-memory bytes-written)

  1200 

  1201       (#(do (println "step with [:b]")%))

  1202       (step [:b])

  1203       (view-memory current-mode)

  1204       (view-memory bytes-written)

  1205 

  1206       (#(do (println "step with [:a :b]")%))

  1207       (step [:a :b])

  1208       (view-memory current-mode)

  1209       (view-memory bytes-written)

  1210 

  1211       (#(do (println "step with [:select]")%))

  1212       (step [:select])

  1213       (view-memory current-mode)

  1214       (view-memory bytes-written)

  1215 

  1216       ;; Reprogramming done, program ready for more commands.

  1217 

  1218       (#(do (println "step with []")%))

  1219       (step [])

  1220       (view-memory current-mode)

  1221       (view-memory bytes-written)

  1222       

  1223       (#(do (println "memory from 0xC00F to 0xC01F:"

  1224                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %)))))

  1225
author	Dylan Holmes <ocsenave@gmail.com>
date	Sun, 18 Mar 2012 05:13:19 -0500
parents	7f7cc8858d2e
children	ffeeabae7dcd