vba-clojure: clojure/com/aurellem/dylans-code annotate

Checkpoint: about to include the state machine in the assembly* code.

author	Dylan Holmes <ocsenave@gmail.com>
date	Sun, 18 Mar 2012 20:49:40 -0500
parents	bcb5c41626b4
children

rev	line source
rlm@117	1
rlm@117	2 (defn count-frames* []
rlm@117	3 (-> (tick (mid-game))
rlm@117	4 (IE! 0) ; disable interrupts
rlm@117	5 (inject-item-assembly
rlm@117	6 ;; write 00010000 to 0xFF00 to select joypad
rlm@117	7 [0x18 ;D31D ; jump over
rlm@117	8 0x02 ;D31E ; the next 2 bytes
rlm@117	9 0x00 ;D31F ; frame-count
rlm@117	10 0x00 ;D320 ; v-blank-prev
rlm@117	11
rlm@117	12
rlm@117	13 0xFA ;D321
rlm@117	14 0x41 ;D322 ; load (FF41) into A
rlm@117	15 0xFF ;D323 ; this contains mode flags
rlm@117	16
rlm@117	17 0x47 ;; copy A -> B
rlm@117	18
rlm@117	19 0xCB
rlm@117	20 0x3F ;; shift A right
rlm@117	21 0x2F ;; complement A
rlm@117	22
rlm@117	23 0xA0 ;; A & B -> A.
rlm@117	24 0x47 ;; copy A -> B. Now the first bit of B is (VB == 1)
rlm@117	25
rlm@117	26 0xFA
rlm@117	27 0x20
rlm@117	28 0xD3 ;; load v-blank-prev into A
rlm@117	29
rlm@117	30 0xA0 ;; A & B -> A.
rlm@117	31 0x4F ;; copy A to C. Now C contains increment-counter?
rlm@117	32
rlm@117	33 0xFA
rlm@117	34 0x1F
rlm@117	35 0xD3 ;; load frame-count into A
rlm@117	36
rlm@117	37 0x81 ;; add increment-counter? to frame-count
rlm@117	38 0xEA ;; store A into frame-count
rlm@117	39 0x1F
rlm@117	40 0xD3
rlm@117	41
rlm@117	42 0x3E ;; load 1 into A
rlm@117	43 0x01
rlm@117	44 0xA0 ;; A & B -> A. Now A is (VB==1)
rlm@117	45 0xEA ;; store A into v-blank-prev
rlm@117	46 0x20
rlm@117	47 0xD3
rlm@117	48
rlm@117	49 0xC3 ;D348 ; return to beginning
rlm@117	50 0x1D ;D349
rlm@117	51 0xD3 ;D34A
rlm@117	52
rlm@117	53
rlm@117	54 ])))

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