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 (defn write-memory-assembly* []

   471   [

   472    0x18 ;; D31D

   473    0x02

   474    0x00 ;; frame-count D31F

   475    0x00 ;; v-blank-prev D320

   476 

   477    0xFA ;; load modes into A

   478    0x41

   479    0xFF

   480    

   481    0x47

   482    

   483    0xCB

   484    0x2F

   485    0x2F

   486 

   487    0xA0

   488    0xE6

   489    0x01

   490    0x47 ;; now B contains (VB==1)

   491 

   492    0xFA ;; load v-blank-prev

   493    0x20

   494    0xD3

   495 

   496    0x2F

   497    

   498    0xA0

   499    0x4F ;; now C contains increment?

   500 

   501    0xFA ;; load frame count

   502    0x1F

   503    0xD3

   504 

   505    0x81 ;; add A+C->A

   506    0xEA ;; spit A --> fc

   507    0x1F

   508    0xD3

   509 

   510    0x78 ;; B->A

   511    

   512    0xEA ;; spit A --> vbprev

   513    0x20

   514    0xD3

   515 

   516    0xC3   ;D40F                    ; go back to beginning

   517    0x1D   ;D410

   518    0xD3   ;D411

   519    ]

   520   )

   521 

   522 (defn write-mem-dyl []

   523   (-> (tick (mid-game))

   524       (IE! 0)

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

   526 

   527 

   528 (defn d2 []

   529   (->

   530    (write-mem-dyl)

   531    (view-memory 0xD31F)

   532    step step step step step

   533    (view-memory 0xD31F)))

   534 

   535 (defn dylan []

   536   (->

   537    (write-mem-dyl)

   538    (tick)

   539    (tick)

   540    (tick)

   541    (tick)

   542    (tick)

   543    (tick)

   544    (tick)

   545    (tick)

   546    (tick)

   547    (tick)

   548    (tick)

   549    (tick)

   550 

   551    (tick)

   552    (tick)

   553    (tick)

   554    (tick)

   555    (tick)

   556 

   557    (d-tick)

   558    (view-register "A" A)

   559    (view-register "B" B)

   560    (view-register "C" C)

   561    

   562    ))

   563 

   564 

   565 

   566 

   567 (defn write-memory-assembly []

   568   [

   569    ;; Main Timing Loop

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

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

   572     

   573    0x18   ; D31D                  ; Variable declaration

   574    0x02   ; D31E                   

   575    0x00   ; D31F                  ; frame-count

   576    0x00   ; D320                  ; v-blank-prev 

   577    

   578    0xF0   ; D321                  ; load v-blank mode flags into A

   579    0x41

   580    0x00

   581 

   582 

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

   584    ;; bits in A are "01"

   585    0xCB   ; D324                  

   586    0x4F   ; D325                  

   587 

   588    0xC2   ; D326                  ; if bit-1 is not 0, then

   589    0x3E   ; D327                  ; GOTO non-v-blank.

   590    0xD3   ; D328                  

   591 

   592    0xCB   ; D329                  

   593    0x47   ; D32A                  

   594 

   595    0xCA   ; D32B                  ; if bit-0 is not 1, then

   596    0x3E   ; D32C                  ; GOTO non-v-blank.

   597    0xD3   ; D32D                  

   598 

   599    ;; V-Blank

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

   601 

   602    0xFA   ; D32E                  ; load v-bank-prev into A

   603    0x20   ; D32F                  

   604    0xD3   ; D330                  

   605 

   606    0xFE   ; D331                  ; compare A to 0. >--------\ 

   607    0x00   ; D332                                              \

   608                                   ;                           |

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

   610    0x3E   ; D333                  ; load 1 into A.            |

   611    0x01   ; D334                                              | 

   612                                   ;                           |

   613    0xEA   ; D335                  ; load A into v-blank-prev  |

   614    0x20   ; D336                                              |

   615    0xD3   ; D337                                              |

   616                                   ;                           /

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

   618    0xCA   ; D338                  ; if v-blank-prev 

   619    0x46   ; D339                  ;   was 0, 

   620    0xD3   ; D33A                  ; GOTO state-machine

   621 

   622    0xC3   ; D33B                  

   623    0x1D   ; D33C                  

   624    0xD3   ; D33D                  ; GOTO beginning

   625    ;; END V-blank

   626 

   627    ;; Non-V-Blank

   628    ;;   Set v-blank-prev to 0

   629    0x3E   ; D33E                  ; load 0 into A

   630    0x00   ; D33F                  

   631 

   632    0xEA   ; D340                  ; load A into v-blank-prev

   633    0x20   ; D341                  

   634    0xD3   ; D342

   635    

   636    0xC3   ; D343                  

   637    0x1D   ; D344                  

   638    0xD3   ; D345                  ; GOTO beginning

   639    ;; END Not-V-Blank

   640 

   641    

   642    ;; Main State Machine -- Input Section

   643    ;;   This is called once every frame.

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

   645    ;;   state transitions.

   646 

   647    ;; Increment frame-count

   648    0xFA   ; D346                  ; load frame-count into A

   649    0x1F   ; D347                  

   650    0xD3   ; D348

   651    

   652    0x3C   ; D349                  ; inc A

   653 

   654    0xEA   ; D34A                  

   655    0x1F   ; D34B                  ; load A into frame-count

   656    0xD3   ; D34C

   657 

   658    0x00   ; D34D                  ; glue :)

   659    

   660    0x18   ;D34E                    ;  skip next 3 bytes

   661    0x03   ;D34F

   662           ;D350

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

   664           ;D351

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

   666    0x00   ;D352                    ;  input-number

   667 

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

   669    

   670    0xFA   ;D353                    ; load (D350) into A

   671    0x50   ;D354      -->       

   672    0xD3   ;D355      -->  D350     

   673    

   674    0xE0   ;D356                    ; load (A), which is 

   675    0x00   ;D357      -->           ; 00010000, into FF00

   676    0x00   ;D358      -->  FF00     ;; NO-OP

   677 

   678    0x06   ;D359

   679           ;D35A

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

   681    0xF0   ;D35B                    ; (FF00) -> A

   682    0x00   ;D35C                   

   683    0x00   ;D35D                    ;; NO-OP

   684 

   685    0xCB   ;D35E                    ; swap nybbles on A

   686    0x37   ;D35F

   687    0xA0   ;D360                    ; (AND A B) -> A

   688    0x47   ;D361                    ; A -> B

   689 

   690    ;; select buttons; store bottom bits in C

   691    

   692    0xFA   ;D362                    ; load (D351) into A

   693    0x51   ;D363      -->       

   694    0xD3   ;D364      -->  D351     

   695    

   696    0xE0   ;D365                    ; load (A), which is 

   697    0x00   ;D366      -->           ; 00001000, into FF00

   698    0x00   ;D367      -->  FF00     ;; NO-OP

   699 

   700    0x0E   ;D368

   701           ;D369

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

   703 

   704    0xF0   ;D36A                    ; (FF00) -> A

   705    0x00   ;D36B                   

   706    0x00   ;D36C

   707    

   708    0xA1   ;D36D                    ; (AND A C) -> A

   709    0x4F   ;D36E                    ; A -> C

   710 

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

   712    0x79   ;D36F                    ; C -> A

   713    0xB0   ;D370                    ; (OR A B) -> A

   714    0x2F   ;D371                    ; negate A

   715 

   716    0xEA   ;D372                    ; store A into input-number

   717    0x52   ;D373

   718    0xD3   ;D374

   719 

   720    0x00   ;D375                  

   721    0x00   ;D376

   722    0x00   ;D377

   723    0x00   ;D378

   724    0x00   ;D379

   725    0x00   ;D37A

   726    0x00   ;D37B                   ; these are here because 

   727    0x00   ;D37C                   ; I messed up :(

   728    0x00   ;D37D

   729    0x00   ;D37E

   730    0x00   ;D37F

   731    

   732    ;; beginning of main state machine   

   733    0x18   ;D380                    ; Declaration of variables

   734    0x05   ;D381                    ;  5 variables:

   735    0x00   ;D382                    ;    current-mode

   736    0x00   ;D383                    ;    bytes-to-write

   737    0x00   ;D384                    ;    bytes-written

   738    0x00   ;D385                    ;    start-point-high

   739    0x00   ;D386                    ;    start-point-low

   740 

   741 

   742    ;; banch on current mode

   743    0xFA   ;D387                    ; load current-mode (0xD382)

   744    0x82   ;D388                    ; into A

   745    0xD3   ;D389

   746    0x00   ;D38A

   747 

   748 

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

   750    0xFE   ;D38B

   751    0x00   ;D38C                    ; compare A with 0x00

   752 

   753    0xCA   ;D38D                    ; goto Mode 0 if A == 0

   754    0xA8   ;D38E

   755    0xD3   ;D38F

   756 

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

   758    0xFE   ;D390

   759    0x01   ;D391                    ; compare A with 0x01

   760 

   761    0xCA   ;D392                  

   762    0xB1   ;D393 

   763    0xD3   ;D394                    ; goto Mode 1 if A == 1

   764 

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

   766    0xFE   ;D395                    

   767    0x02   ;D396                    ; compare A with 0x02

   768 

   769    0xCA   ;D397

   770    0xBF   ;D398

   771    0xD3   ;D399                    ; goto Mode 2 if A == 2

   772 

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

   774    0xFE   ;D39A

   775    0x03   ;D39B

   776 

   777    0xCA   ;D39C

   778    0xCD   ;D39D

   779    0xD3   ;D39E                    ; goto Mode 3 if A == 3

   780 

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

   782    0xFE   ;D39F

   783    0x04   ;D3A0

   784 

   785    0xCA   ;D3A1

   786    0xDB   ;D3A2

   787    0xD3   ;D3A3

   788 

   789    0x00   ;D3A4

   790    ;; End of Mode checking, goto beginning

   791    0xC3   ;D3A5

   792    0x1D   ;D3A6

   793    0xD3   ;D3A7

   794 

   795 

   796    ;; Mode 0 -- input-mode mode

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

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

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

   800 

   801    ;;   set current-mode to input-number

   802    0xFA   ;D3A8                    ; load input-number (0xD352) 

   803    0x52   ;D3A9                    ; into A

   804    0xD3   ;D3AA

   805 

   806    0xEA   ;D3AB                    ; load A into current-mode

   807    0x82   ;D3AC                    ; (0xD382)

   808    0xD3   ;D3AD

   809 

   810    0xC3   ;D3AE                    ; go back to beginning

   811    0x1D   ;D3AF

   812    0xD3   ;D3B0

   813    ;; End Mode 0

   814 

   815 

   816    ;; Mode 1 -- set-length mode

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

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

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

   820    ;;      completes.

   821 

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

   823    ;;      set current-mode to 0x02.

   824    0xFA   ;D3B1                   ; load input-number (0xD352)

   825    0x52   ;D3B2                   ; into A

   826    0xD3   ;D3B3

   827    

   828    0xEA   ;D3B4                   ; load A into bytes-left-to-write

   829    0x83   ;D3B5                   ; (0xD383)

   830    0xD3   ;D3B6

   831 

   832    0x3E   ;D3B7                   ; load 0x02 into A.

   833    0x02   ;D3B8

   834    

   835    0xEA   ;D3B9                   ; load A to current-mode

   836    0x82   ;D3BA                   ; advancing from Mode 1 to 

   837    0xD3   ;D3BB                   ; Mode 2

   838    

   839    0xC3   ;D3BC                   ; go back to beginning

   840    0x1D   ;D3BD

   841    0xD3   ;D3BE

   842    ;; End Mode 1

   843 

   844 

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

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

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

   848    ;;      data will be written.

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

   850 

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

   852    ;;      set current mode to 0x03.

   853    0xFA   ;D3BF                   ; load input-number (0xD352)

   854    0x52   ;D3C0                   ; into A

   855    0xD3   ;D3C1

   856 

   857    0xEA   ;D3C2                   ; load A into start-point-high

   858    0x85   ;D3C3                   ; (0xD385)

   859    0xD3   ;D3C4

   860 

   861    0x3E   ;D3C5                   ; load 0x03 into A.

   862    0x03   ;D3C6

   863 

   864    0xEA   ;D3C7                   ; load A to current-mode,

   865    0x82   ;D3C8                   ; advancing from Mode 2 to 

   866    0xD3   ;D3C9                   ; Mode 3.

   867    

   868    0xC3   ;D3CA                   ; go back to beginning

   869    0x1D   ;D3CB

   870    0xD3   ;D3CC

   871    ;;End Mode 2

   872 

   873 

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

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

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

   877 

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

   879    ;;      set current mode to 0x04

   880    0xFA   ;D3CD                   ; load input-number into A

   881    0x52   ;D3CE                   

   882    0xD3   ;D3CF                   

   883 

   884    0xEA   ;D3D0                   ; load A into start-point-low

   885    0x86   ;D3D1                   

   886    0xD3   ;D3D2                   

   887 

   888    0x3E   ;D3D3                   ; load 0x04 into A.

   889    0x04   ;D3D4                   

   890 

   891    0xEA   ;D3D5                   ; load A to current-mode,

   892    0x82   ;D3D6                   ; advancing from Mode 3 to 

   893    0xD3   ;D3D7                   ; Mode 4.

   894 

   895    0xC3   ;D3D8                   ; go back to beginning

   896    0x1D   ;D3D9                   

   897    0xD3   ;D3DA                   

   898    

   899    ;; Mode 4 -- write bytes mode

   900 

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

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

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

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

   905 

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

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

   908   

   909    0xFA   ;D3DB                   ; load bytes-to-write into A

   910    0x83   ;D3DC

   911    0xD3   ;D3DD

   912 

   913    0x47   ;D3DE                   ; load A into B

   914 

   915    0xFA   ;D3DF                   ; load bytes-written into A

   916    0x84   ;D3E0

   917    0xD3   ;D3E1

   918 

   919    0xB8   ;D3E2                   ; compare A with B

   920 

   921    0xCA   ;D3E3                   ; if they are equal, go to cleanup

   922    0x07   ;D3E4                   

   923    0xD4   ;D3E5                   

   924 

   925    ;;  Write Memory Section

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

   927    ;;    into the current target register, determined by

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

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

   930    

   931    0xFA   ;D3E6                   ; load start-point-high into A

   932    0x85   ;D3E7                   

   933    0xD3   ;D3E8                   

   934 

   935    0x67   ;D3E9                   ; load A into H

   936 

   937    0xFA   ;D3EA                   ; load start-point-low into A

   938    0x86   ;D3EB                   

   939    0xD3   ;D3EC

   940    

   941    0x6F   ;D3ED                   ; load A into L

   942    

   943    0xFA   ;D3EE                   ; load bytes-written into A

   944    0x84   ;D3EF                   

   945    0xD3   ;D3F0                   

   946    

   947    0x00   ;D3F1                   ; These are here because

   948    0x00   ;D3F2                   ; I screwed up again.

   949    0x00   ;D3F3                   

   950 

   951    0x85   ;D3F4                   ; add L to A; store A in L.

   952    0x6F   ;D3F5                   

   953 

   954    0x30   ;D3F6                   ; If the addition overflowed,

   955    0x01   ;D3F7                   

   956    0x24   ;D3F8                   ; increment H.

   957 

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

   959    

   960    0xFA   ;D3F9                   ; load input-number into A

   961    0x52   ;D3FA                   

   962    0xD3   ;D3FB                   

   963 

   964    0x77   ;D3FC                   ; load A into (HL)

   965 

   966    0xFA   ;D3FD                   ; load bytes-written into A

   967    0x84   ;D3FE                   

   968    0xD3   ;D3FF                   

   969 

   970    0x3C   ;D400                   ; increment A

   971 

   972    0xEA   ;D401                   ; load A into bytes-written

   973    0x84   ;D402                   

   974    0xD3   ;D403

   975 

   976    0xC3   ;D404                   ; go back to beginning.

   977    0x1D   ;D405

   978    0xD3   ;D406

   979    ;;  End Write Memory Section

   980 

   981    ;;  Mode 4 Cleanup Section

   982    ;;    reset bytes-written to 0

   983    ;;    set mode to 0

   984    0x3E   ;D407                   ; load 0 into A

   985    0x00   ;D408                  

   986 

   987    0xEA   ;D409                   ; load A into bytes-written

   988    0x84   ;D40A                   

   989    0xD3   ;D40B                   

   990 

   991    0xEA   ;D40C                   ; load A into current-mode

   992    0x82   ;D40D                   

   993    0xD3   ;D40E                   

   994 

   995    0xC3   ;D40F                    ; go back to beginning

   996    0x1D   ;D410

   997    0xD3   ;D411

   998 

   999    ;; End Mode 4

  1000    

  1001    ])

  1002 

  1003 

  1004 

  1005 (def frame-count 0xD31F)

  1006 (def input 0xD352)

  1007 (def current-mode      0xD382)

  1008 (def bytes-to-write    0xD383)

  1009 (def bytes-written     0xD384)

  1010 (def start-point-high  0xD385)

  1011 (def start-point-low   0xD386)

  1012 

  1013 

  1014 

  1015 (defn write-memory []

  1016   (-> (tick (mid-game))

  1017       (IE! 0) ; disable interrupts

  1018       (inject-item-assembly (write-memory-assembly))))

  1019 

  1020 (defn test-write-memory []

  1021   (set-state! (write-memory))

  1022   (dorun

  1023    (dotimes [_ 5000]

  1024      (view-memory (step @current-state) current-mode))))

  1025 

  1026 (def bytes-to-write 0xD383)

  1027 (def start-point 0xD384)

  1028 

  1029 (defn print-blank-assembly

  1030   [start end]

  1031   (dorun

  1032    (map

  1033     #(println (format "0x00   ;%04X                   " %))

  1034     (range start end))))

  1035 

  1036 (defn test-mode-2 []

  1037   (->

  1038    (write-memory)

  1039    (view-memory frame-count)

  1040    (step)

  1041    (step [:a])

  1042    (step [:b])

  1043    (step [:start])

  1044    (step [])

  1045    (view-memory frame-count)))

  1046 

  1047 (defn test-mode-4

  1048   ([] (test-mode-4 (write-memory)))

  1049   ([target-state]

  1050      (->

  1051       target-state

  1052       (#(do (println "memory from 0xC00F to 0xC01F:"

  1053                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %))

  1054       (view-memory current-mode)

  1055       (step [])

  1056       (step [])

  1057       (step [])

  1058       (#(do (println "after three steps") %))

  1059       (view-memory current-mode)

  1060 

  1061       ;; Activate memory writing mode

  1062       

  1063       (#(do (println "step with [:a]") %))

  1064       (step [:a])

  1065       (view-memory current-mode)

  1066       (view-memory bytes-to-write)

  1067       (view-memory start-point-high)

  1068       (view-memory start-point-low)

  1069 

  1070       ;; Specify four bytes to be written

  1071       

  1072       (#(do (println "step with [:select]")%))

  1073       (step [:select])

  1074       (view-memory current-mode)

  1075       (view-memory bytes-to-write)

  1076       (view-memory start-point-high)

  1077       (view-memory start-point-low)

  1078 

  1079       ;; Specify target memory address as 0xC00F

  1080       

  1081       (#(do (println "step with [:u :d]")%))

  1082       (step [:u :d])

  1083       (view-memory current-mode)

  1084       (view-memory bytes-to-write)

  1085       (view-memory start-point-high)

  1086       (view-memory start-point-low)

  1087 

  1088       (#(do (println "step with [:a :b :start :select]")%))

  1089       (step [:a :b :start :select])

  1090       (view-memory current-mode)

  1091       (view-memory bytes-to-write)

  1092       (view-memory start-point-high)

  1093       (view-memory start-point-low)

  1094 

  1095       ;; Start reprogramming memory

  1096 

  1097       (#(do (println "step with [:a]")%))

  1098       (step [:a])

  1099       (view-memory current-mode)

  1100       (view-memory bytes-written)

  1101 

  1102       (#(do (println "step with [:b]")%))

  1103       (step [:b])

  1104       (view-memory current-mode)

  1105       (view-memory bytes-written)

  1106 

  1107       (#(do (println "step with [:a :b]")%))

  1108       (step [:a :b])

  1109       (view-memory current-mode)

  1110       (view-memory bytes-written)

  1111 

  1112       (#(do (println "step with [:select]")%))

  1113       (step [:select])

  1114       (view-memory current-mode)

  1115       (view-memory bytes-written)

  1116 

  1117       ;; Reprogramming done, program ready for more commands.

  1118 

  1119       (#(do (println "step with []")%))

  1120       (step [])

  1121       (view-memory current-mode)

  1122       (view-memory bytes-written)

  1123       

  1124       (#(do (println "memory from 0xC00F to 0xC01F:"

  1125                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %)))))

  1126
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 17 Mar 2012 21:32:29 -0500
parents	7f7cc8858d2e
children	eb6ba88088d3