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fire_tiny: give up at 106 bytes

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This commit is contained in:
Vince Weaver 2019-01-01 00:39:33 -05:00
parent 0b01b62a46
commit bf2010398a
3 changed files with 26 additions and 19 deletions
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BIN
fire/fire.dsk
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42
fire/fire_tiny.s
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@ -30,11 +30,17 @@
; 113 bytes -- make get_row a subroutine
; 112 bytes -- regrettable change to the low-byte code
; 109 bytes -- replace BIT/OR in low calc with an ADC
; 107 bytes -- replace self-modifying load/store absolute with Y-indirect
; 106 bytes -- assume bit 8 is as random as bit 0
; Zero Page
SEEDL = $4E
TEMP = $00
TEMPY = $01
OUTL = $02
OUTH = $03
INL = $04
INH = $05
; 100 = $64
@ -73,26 +79,21 @@ fire_loop:
yloop:
stx TEMPY ; txa/pha not any better ; 2
; Self-modify the inner loop so it loads/stores from proper
; low-res address. Generate the proper row memory address
; setup the load/store addresses
; using Y-indirect is smaller than self-modifying code
jsr get_row ; 3
sty <smc_sta+1 ; 2
sta <smc_sta+2 ; 2
sty OUTL ; 2
sta OUTH ; 2
inx ; 1
jsr get_row ; 3
sty <smc_lda+1 ; 2
sta <smc_lda+2 ; 2
sty INL ; 2
sta INH ; 2
ldy #39 ; 2
xloop:
smc_lda:
lda $7d0,Y ; load value at row+1 ; 3
pha ; save on stack ; 1
and #$7 ; mask off ; 2
tax ; 1
;=============================
; random8
@ -112,18 +113,21 @@ noEor: sta SEEDL ; 2
; end inlined RNG
ror ; shift into carry ; 1
bmi no_change ; assume bit 8 is as random as bit 0 ; 2
pla ; 1
bcs no_change ; 2
lda (INL),Y ; load value at row+1 ; 2
and #$7 ; mask off ; 2
tax ; 1
lda <(color_progression),X ; 2
.byte $2c ; BIT trick, nops out next instruction ; 1
no_change:
lda <(color_progression),X ; 2
lda (INL),Y ; load value at row+1 ; 2
smc_sta:
sta $750,Y ; 3
sta (OUTL),Y ; 2
dey ; 1
bpl xloop ; 2
@ -136,10 +140,10 @@ smc_sta:
color_progression:
.byte $00 ; 8->0 ; 1000 0101
.byte $bb ; 9->11 ; 1001 0001
.byte $00 ; 8->0 ; 1000 0000
.byte $bb ; 9->11 ; 1001 1011
.byte $00 ; 10->0 ; 1010 0000
.byte $aa ; 11->10 ; 1011 0000
.byte $aa ; 11->10 ; 1011 1010
.byte $00 ; 12->0 ; 1100 0000
.byte $99 ; 13->9 ; 1101 1001
.byte $00 ; 14->0 ; 1110 0000

3
fire/monitor_command Normal file
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@ -0,0 +1,3 @@
70: 20 90 F3 2C 52 C0 A9 FF A0 27 99 D0 07 88 10 FA A2 16 86 01 20 C2 00 84 02 85 03 E8 20 C2 00 84 04 85 05 A0 27 A5 4E F0 05 0A F0 04 90 02 49 1D 85 4E 30 08 B1 04 29 07 AA B5 BA 2C B1 04 91 02
B0: 88 10 E2 A6 01 CA 10 CA 30 C6 00 BB 00 AA 00 99 00 DD 8A 29 19 4A 69 01 4A 4A A8 B9 D7 00 6A A8 8A 29 07 4A 09 04 60 00 50 A0
70G