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 (defn d2 []

   468   (->

   469    (write-mem-dyl)

   470    (view-memory 0xD31F)

   471    step step step step step

   472    (view-memory 0xD31F)))

   473 

   474 (defn dylan []

   475   (->

   476    (write-mem-dyl)

   477    (tick)

   478    (tick)

   479    (tick)

   480    (tick)

   481    (tick)

   482    (tick)

   483    (tick)

   484    (tick)

   485    (tick)

   486    (tick)

   487    (tick)

   488    (tick)

   489 

   490    (tick)

   491    (tick)

   492    (tick)

   493    (tick)

   494    (tick)

   495 

   496    (d-tick)

   497    (view-register "A" A)

   498    (view-register "B" B)

   499    (view-register "C" C)

   500    

   501    ))

   502 

   503 

   504     

   505 

   506 (defn write-memory-assembly* []

   507   [

   508    0x18 ;; D31D

   509    0x02

   510    0x00 ;; frame-count D31F

   511    0x00 ;; v-blank-prev D320

   512 

   513    0xFA ;; load modes into A

   514    0x41

   515    0xFF

   516    

   517    0x47

   518    

   519    0xCB

   520    0x2F

   521    0x2F

   522 

   523    0xA0

   524    0xE6

   525    0x01

   526    0x47 ;; now B contains (VB==1)

   527 

   528    0xFA ;; load v-blank-prev

   529    0x20

   530    0xD3

   531 

   532    0x2F

   533    

   534    0xA0

   535    0x4F ;; now C contains increment?

   536 

   537    0xFA ;; load frame count

   538    0x1F

   539    0xD3

   540 

   541    0x81 ;; add A+C->A

   542    0xEA ;; spit A --> fc

   543    0x1F

   544    0xD3

   545 

   546    0x78 ;; B->A

   547    

   548    0xEA ;; spit A --> vbprev

   549    0x20

   550    0xD3

   551 

   552    0xC3   ;D40F                    ; go back to beginning

   553    0x1D   ;D410

   554    0xD3   ;D411

   555    ]

   556   )

   557 

   558 (defn write-mem-dyl []

   559   (-> (tick (mid-game))

   560       (IE! 0)

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

   562             

   563 

   564 

   565 (defn write-memory-assembly []

   566    [

   567    ;; Main Timing Loop

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

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

   570    

   571    0x18   ; D31D                  ; Variable declaration

   572    0x02   ; D31E                   

   573    0x00   ; D31F                  ; frame-count

   574    0x00   ; D320                  ; v-blank-prev 

   575 

   576    0xFA   ; D321                  ; load v-blank mode flags into A

   577    0x41   ; D322                  

   578    0xFF   ; D323                  

   579 

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

   581    ;; bits in A are "01"

   582    0xCB   ; D324                  

   583    0x4F   ; D325                  

   584 

   585    0xC2   ; D326                  ; if bit-1 is not 0, then

   586    0x3E   ; D327                  ; GOTO non-v-blank.

   587    0xD3   ; D328                  

   588 

   589    0xCB   ; D329                  

   590    0x47   ; D32A                  

   591 

   592    0xCA   ; D32B                  ; if bit-0 is not 1, then

   593    0x3E   ; D32C                  ; GOTO non-v-blank.

   594    0xD3   ; D32D                  

   595 

   596    ;; V-Blank

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

   598 

   599    0xFA   ; D32E                  ; load v-bank-prev into A

   600    0x20   ; D32F                  

   601    0xD3   ; D330                  

   602 

   603    0xFE   ; D331                  ; compare A to 0. >--------\ 

   604    0x00   ; D332                                              \

   605                                   ;                           |

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

   607    0x3E   ; D333                  ; load 1 into A.            |

   608    0x01   ; D334                                              | 

   609                                   ;                           |

   610    0xEA   ; D335                  ; load A into v-blank-prev  |

   611    0x20   ; D336                                              |

   612    0xD3   ; D337                                              |

   613                                   ;                           /

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

   615    0xCA   ; D338                  ; if v-blank-prev 

   616    0x46   ; D339                  ;   was 0, 

   617    0xD3   ; D33A                  ; GOTO state-machine

   618 

   619    0xC3   ; D33B                  

   620    0x1D   ; D33C                  

   621    0xD3   ; D33D                  ; GOTO beginning

   622    ;; END V-blank

   623 

   624    ;; Non-V-Blank

   625    ;;   Set v-blank-prev to 0

   626    0x3E   ; D33E                  ; load 0 into A

   627    0x00   ; D33F                  

   628 

   629    0xEA   ; D340                  ; load A into v-blank-prev

   630    0x20   ; D341                  

   631    0xD3   ; D342

   632    

   633    0xC3   ; D343                  

   634    0x1D   ; D344                  

   635    0xD3   ; D345                  ; GOTO beginning

   636    ;; END Not-V-Blank

   637 

   638    

   639    ;; Main State Machine -- Input Section

   640    ;;   This is called once every frame.

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

   642    ;;   state transitions.

   643 

   644    ;; Increment frame-count

   645    0xFA   ; D346                  ; load frame-count into A

   646    0x1F   ; D347                  

   647    0xD3   ; D348

   648    

   649    0x3C   ; D349                  ; inc A

   650 

   651    0xEA   ; D34A                  

   652    0x1F   ; D34B                  ; load A into frame-count

   653    0xD3   ; D34C

   654 

   655    0x00   ; D34D                  ; glue :)

   656    

   657    0x18   ;D34E                    ;  skip next 3 bytes

   658    0x03   ;D34F

   659           ;D350

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

   661           ;D351

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

   663    0x00   ;D352                    ;  input-number

   664 

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

   666    

   667    0xFA   ;D353                    ; load (D350) into A

   668    0x50   ;D354      -->       

   669    0xD3   ;D355      -->  D350     

   670    

   671    0xEA   ;D356                    ; load (A), which is 

   672    0x00   ;D357      -->           ; 00010000, into FF00

   673    0xFF   ;D358      -->  FF00     

   674 

   675    0x06   ;D359

   676           ;D35A

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

   678    0xFA   ;D35B                    ; (FF00) -> A

   679    0x00   ;D35C                   

   680    0xFF   ;D35D

   681 

   682    0xCB   ;D35E                    ; swap nybbles on A

   683    0x37   ;D35F

   684    0xA0   ;D360                    ; (AND A B) -> A

   685    0x47   ;D361                    ; A -> B

   686 

   687    ;; select buttons; store bottom bits in C

   688    

   689    0xFA   ;D362                    ; load (D351) into A

   690    0x51   ;D363      -->       

   691    0xD3   ;D364      -->  D351     

   692    

   693    0xEA   ;D365                    ; load (A), which is 

   694    0x00   ;D366      -->           ; 00001000, into FF00

   695    0xFF   ;D367      -->  FF00     

   696 

   697    0x0E   ;D368

   698           ;D369

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

   700 

   701    0xFA   ;D36A                    ; (FF00) -> A

   702    0x00   ;D36B                   

   703    0xFF   ;D36C

   704    

   705    0xA1   ;D36D                    ; (AND A C) -> A

   706    0x4F   ;D36E                    ; A -> C

   707 

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

   709    0x79   ;D36F                    ; C -> A

   710    0xB0   ;D370                    ; (OR A B) -> A

   711    0x2F   ;D371                    ; negate A

   712 

   713    0xEA   ;D372                    ; store A into input-number

   714    0x52   ;D373

   715    0xD3   ;D374

   716 

   717    0x00   ;D375                  

   718    0x00   ;D376

   719    0x00   ;D377

   720    0x00   ;D378

   721    0x00   ;D379

   722    0x00   ;D37A

   723    0x00   ;D37B                   ; these are here because 

   724    0x00   ;D37C                   ; I messed up :(

   725    0x00   ;D37D

   726    0x00   ;D37E

   727    0x00   ;D37F

   728    

   729    ;; beginning of main state machine   

   730    0x18   ;D380                    ; Declaration of variables

   731    0x05   ;D381                    ;  5 variables:

   732    0x00   ;D382                    ;    current-mode

   733    0x00   ;D383                    ;    bytes-to-write

   734    0x00   ;D384                    ;    bytes-written

   735    0x00   ;D385                    ;    start-point-high

   736    0x00   ;D386                    ;    start-point-low

   737 

   738 

   739    ;; banch on current mode

   740    0xFA   ;D387                    ; load current-mode (0xD382)

   741    0x82   ;D388                    ; into A

   742    0xD3   ;D389

   743    0x00   ;D38A

   744 

   745 

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

   747    0xFE   ;D38B

   748    0x00   ;D38C                    ; compare A with 0x00

   749 

   750    0xCA   ;D38D                    ; goto Mode 0 if A == 0

   751    0xA8   ;D38E

   752    0xD3   ;D38F

   753 

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

   755    0xFE   ;D390

   756    0x01   ;D391                    ; compare A with 0x01

   757 

   758    0xCA   ;D392                  

   759    0xB1   ;D393 

   760    0xD3   ;D394                    ; goto Mode 1 if A == 1

   761 

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

   763    0xFE   ;D395                    

   764    0x02   ;D396                    ; compare A with 0x02

   765 

   766    0xCA   ;D397

   767    0xBF   ;D398

   768    0xD3   ;D399                    ; goto Mode 2 if A == 2

   769 

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

   771    0xFE   ;D39A

   772    0x03   ;D39B

   773 

   774    0xCA   ;D39C

   775    0xCD   ;D39D

   776    0xD3   ;D39E                    ; goto Mode 3 if A == 3

   777 

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

   779    0xFE   ;D39F

   780    0x04   ;D3A0

   781 

   782    0xCA   ;D3A1

   783    0xDB   ;D3A2

   784    0xD3   ;D3A3

   785 

   786    0x00   ;D3A4

   787    ;; End of Mode checking, goto beginning

   788    0xC3   ;D3A5

   789    0x1D   ;D3A6

   790    0xD3   ;D3A7

   791 

   792 

   793    ;; Mode 0 -- input-mode mode

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

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

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

   797 

   798    ;;   set current-mode to input-number

   799    0xFA   ;D3A8                    ; load input-number (0xD352) 

   800    0x52   ;D3A9                    ; into A

   801    0xD3   ;D3AA

   802 

   803    0xEA   ;D3AB                    ; load A into current-mode

   804    0x82   ;D3AC                    ; (0xD382)

   805    0xD3   ;D3AD

   806 

   807    0xC3   ;D3AE                    ; go back to beginning

   808    0x1D   ;D3AF

   809    0xD3   ;D3B0

   810    ;; End Mode 0

   811 

   812 

   813    ;; Mode 1 -- set-length mode

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

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

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

   817    ;;      completes.

   818 

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

   820    ;;      set current-mode to 0x02.

   821    0xFA   ;D3B1                   ; load input-number (0xD352)

   822    0x52   ;D3B2                   ; into A

   823    0xD3   ;D3B3

   824    

   825    0xEA   ;D3B4                   ; load A into bytes-left-to-write

   826    0x83   ;D3B5                   ; (0xD383)

   827    0xD3   ;D3B6

   828 

   829    0x3E   ;D3B7                   ; load 0x02 into A.

   830    0x02   ;D3B8

   831    

   832    0xEA   ;D3B9                   ; load A to current-mode

   833    0x82   ;D3BA                   ; advancing from Mode 1 to 

   834    0xD3   ;D3BB                   ; Mode 2

   835    

   836    0xC3   ;D3BC                   ; go back to beginning

   837    0x1D   ;D3BD

   838    0xD3   ;D3BE

   839    ;; End Mode 1

   840 

   841 

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

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

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

   845    ;;      data will be written.

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

   847 

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

   849    ;;      set current mode to 0x03.

   850    0xFA   ;D3BF                   ; load input-number (0xD352)

   851    0x52   ;D3C0                   ; into A

   852    0xD3   ;D3C1

   853 

   854    0xEA   ;D3C2                   ; load A into start-point-high

   855    0x85   ;D3C3                   ; (0xD385)

   856    0xD3   ;D3C4

   857 

   858    0x3E   ;D3C5                   ; load 0x03 into A.

   859    0x03   ;D3C6

   860 

   861    0xEA   ;D3C7                   ; load A to current-mode,

   862    0x82   ;D3C8                   ; advancing from Mode 2 to 

   863    0xD3   ;D3C9                   ; Mode 3.

   864    

   865    0xC3   ;D3CA                   ; go back to beginning

   866    0x1D   ;D3CB

   867    0xD3   ;D3CC

   868    ;;End Mode 2

   869 

   870 

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

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

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

   874 

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

   876    ;;      set current mode to 0x04

   877    0xFA   ;D3CD                   ; load input-number into A

   878    0x52   ;D3CE                   

   879    0xD3   ;D3CF                   

   880 

   881    0xEA   ;D3D0                   ; load A into start-point-low

   882    0x86   ;D3D1                   

   883    0xD3   ;D3D2                   

   884 

   885    0x3E   ;D3D3                   ; load 0x04 into A.

   886    0x04   ;D3D4                   

   887 

   888    0xEA   ;D3D5                   ; load A to current-mode,

   889    0x82   ;D3D6                   ; advancing from Mode 3 to 

   890    0xD3   ;D3D7                   ; Mode 4.

   891 

   892    0xC3   ;D3D8                   ; go back to beginning

   893    0x1D   ;D3D9                   

   894    0xD3   ;D3DA                   

   895    

   896    ;; Mode 4 -- write bytes mode

   897 

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

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

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

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

   902 

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

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

   905   

   906    0xFA   ;D3DB                   ; load bytes-to-write into A

   907    0x83   ;D3DC

   908    0xD3   ;D3DD

   909 

   910    0x47   ;D3DE                   ; load A into B

   911 

   912    0xFA   ;D3DF                   ; load bytes-written into A

   913    0x84   ;D3E0

   914    0xD3   ;D3E1

   915 

   916    0xB8   ;D3E2                   ; compare A with B

   917 

   918    0xCA   ;D3E3                   ; if they are equal, go to cleanup

   919    0x07   ;D3E4                   

   920    0xD4   ;D3E5                   

   921 

   922    ;;  Write Memory Section

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

   924    ;;    into the current target register, determined by

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

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

   927    

   928    0xFA   ;D3E6                   ; load start-point-high into A

   929    0x85   ;D3E7                   

   930    0xD3   ;D3E8                   

   931 

   932    0x67   ;D3E9                   ; load A into H

   933 

   934    0xFA   ;D3EA                   ; load start-point-low into A

   935    0x86   ;D3EB                   

   936    0xD3   ;D3EC

   937    

   938    0x6F   ;D3ED                   ; load A into L

   939    

   940    0xFA   ;D3EE                   ; load bytes-written into A

   941    0x84   ;D3EF                   

   942    0xD3   ;D3F0                   

   943    

   944    0x00   ;D3F1                   ; These are here because

   945    0x00   ;D3F2                   ; I screwed up again.

   946    0x00   ;D3F3                   

   947 

   948    0x85   ;D3F4                   ; add L to A; store A in L.

   949    0x6F   ;D3F5                   

   950 

   951    0x30   ;D3F6                   ; If the addition overflowed,

   952    0x01   ;D3F7                   

   953    0x24   ;D3F8                   ; increment H.

   954 

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

   956    

   957    0xFA   ;D3F9                   ; load input-number into A

   958    0x52   ;D3FA                   

   959    0xD3   ;D3FB                   

   960 

   961    0x77   ;D3FC                   ; load A into (HL)

   962 

   963    0xFA   ;D3FD                   ; load bytes-written into A

   964    0x84   ;D3FE                   

   965    0xD3   ;D3FF                   

   966 

   967    0x3C   ;D400                   ; increment A

   968 

   969    0xEA   ;D401                   ; load A into bytes-written

   970    0x84   ;D402                   

   971    0xD3   ;D403

   972 

   973    0xC3   ;D404                   ; go back to beginning.

   974    0x1D   ;D405

   975    0xD3   ;D406

   976    ;;  End Write Memory Section

   977 

   978    ;;  Mode 4 Cleanup Section

   979    ;;    reset bytes-written to 0

   980    ;;    set mode to 0

   981    0x3E   ;D407                   ; load 0 into A

   982    0x00   ;D408                  

   983 

   984    0xEA   ;D409                   ; load A into bytes-written

   985    0x84   ;D40A                   

   986    0xD3   ;D40B                   

   987 

   988    0xEA   ;D40C                   ; load A into current-mode

   989    0x82   ;D40D                   

   990    0xD3   ;D40E                   

   991 

   992    0xC3   ;D40F                    ; go back to beginning

   993    0x1D   ;D410

   994    0xD3   ;D411

   995 

   996    ;; End Mode 4

   997    

   998    ])

   999 

  1000 

  1001 

  1002 (def frame-count 0xD31F)

  1003 (def input 0xD352)

  1004 (def current-mode      0xD382)

  1005 (def bytes-to-write    0xD383)

  1006 (def bytes-written     0xD384)

  1007 (def start-point-high  0xD385)

  1008 (def start-point-low   0xD386)

  1009 

  1010 

  1011 

  1012 (defn write-memory []

  1013   (-> (tick (mid-game))

  1014       (IE! 0) ; disable interrupts

  1015       (inject-item-assembly (write-memory-assembly))))

  1016 

  1017 (defn test-write-memory []

  1018   (set-state! (write-memory))

  1019   (dorun

  1020    (dotimes [_ 5000]

  1021      (view-memory (step @current-state) current-mode))))

  1022 

  1023 (def bytes-to-write 0xD383)

  1024 (def start-point 0xD384)

  1025 

  1026 (defn print-blank-assembly

  1027   [start end]

  1028   (dorun

  1029    (map

  1030     #(println (format "0x00   ;%04X                   " %))

  1031     (range start end))))

  1032 

  1033 (defn test-mode-2 []

  1034   (->

  1035    (write-memory)

  1036    (view-memory frame-count)

  1037    (step)

  1038    (step [:a])

  1039    (step [:b])

  1040    (step [:start])

  1041    (step [])

  1042    (view-memory frame-count)))

  1043 

  1044 (defn test-mode-4

  1045   ([] (test-mode-4 (write-memory)))

  1046   ([target-state]

  1047      (->

  1048       target-state

  1049       (#(do (println "memory from 0xC00F to 0xC01F:"

  1050                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %))

  1051       (view-memory current-mode)

  1052       (step [])

  1053       (step [])

  1054       (step [])

  1055       (#(do (println "after three steps") %))

  1056       (view-memory current-mode)

  1057 

  1058       ;; Activate memory writing mode

  1059       

  1060       (#(do (println "step with [:a]") %))

  1061       (step [:a])

  1062       (view-memory current-mode)

  1063       (view-memory bytes-to-write)

  1064       (view-memory start-point-high)

  1065       (view-memory start-point-low)

  1066 

  1067       ;; Specify four bytes to be written

  1068       

  1069       (#(do (println "step with [:select]")%))

  1070       (step [:select])

  1071       (view-memory current-mode)

  1072       (view-memory bytes-to-write)

  1073       (view-memory start-point-high)

  1074       (view-memory start-point-low)

  1075 

  1076       ;; Specify target memory address as 0xC00F

  1077       

  1078       (#(do (println "step with [:u :d]")%))

  1079       (step [:u :d])

  1080       (view-memory current-mode)

  1081       (view-memory bytes-to-write)

  1082       (view-memory start-point-high)

  1083       (view-memory start-point-low)

  1084 

  1085       (#(do (println "step with [:a :b :start :select]")%))

  1086       (step [:a :b :start :select])

  1087       (view-memory current-mode)

  1088       (view-memory bytes-to-write)

  1089       (view-memory start-point-high)

  1090       (view-memory start-point-low)

  1091 

  1092       ;; Start reprogramming memory

  1093 

  1094       (#(do (println "step with [:a]")%))

  1095       (step [:a])

  1096       (view-memory current-mode)

  1097       (view-memory bytes-written)

  1098 

  1099       (#(do (println "step with [:b]")%))

  1100       (step [:b])

  1101       (view-memory current-mode)

  1102       (view-memory bytes-written)

  1103 

  1104       (#(do (println "step with [:a :b]")%))

  1105       (step [:a :b])

  1106       (view-memory current-mode)

  1107       (view-memory bytes-written)

  1108 

  1109       (#(do (println "step with [:select]")%))

  1110       (step [:select])

  1111       (view-memory current-mode)

  1112       (view-memory bytes-written)

  1113 

  1114       ;; Reprogramming done, program ready for more commands.

  1115 

  1116       (#(do (println "step with []")%))

  1117       (step [])

  1118       (view-memory current-mode)

  1119       (view-memory bytes-written)

  1120       

  1121       (#(do (println "memory from 0xC00F to 0xC01F:"

  1122                      (subvec (vec (memory %)) 0xC00F 0xC01F)) %)))))

  1123 

  1124
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 17 Mar 2012 19:18:01 -0500
parents	901ee6b648da
children	5e4feb77f2d8