hgr: wires: down to 91 bytes

This commit is contained in:
Vince Weaver 2021-10-07 15:31:14 -04:00
parent 7c680e4b56
commit 05953557ed
2 changed files with 135 additions and 42 deletions

View File

@ -0,0 +1,121 @@
; wires -- Apple II Hires
; D0+ used by HGR routines
HGR_COLOR = $E4
HGR_PAGE = $E6
GBASL = $26
GBASH = $27
COUNT = $FE
FRAME = $FF
; soft-switches
; ROM routines
HGR2 = $F3D8 ; set hires page2 and clear $4000-$5fff
HGR = $F3E2 ; set hires page1 and clear $2000-$3fff
HPLOT0 = $F457 ; plot at (Y,X), (A)
HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
COLORTBL = $F6F6
PLOT = $F800 ; PLOT AT Y,A (A colors output, Y preserved)
NEXTCOL = $F85F ; COLOR=COLOR+3
SETCOL = $F864 ; COLOR=A
SETGR = $FB40 ; set graphics and clear LO-RES screen
BELL2 = $FBE4
WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
wires:
jsr HGR2
; set to F0 for shorter weird intro
; ldx #$0
outer_loop:
; pulse loop horizontal
lda #$00
tay
sta GBASL
lda #$40
sta GBASH
horiz_loop:
lda even_lookup,X
sta (GBASL),Y
iny
lda odd_lookup,X
sta (GBASL),Y
iny
bne noflo2
inc GBASH
noflo2:
lda #$44
cmp GBASH
bne horiz_loop
lda #$44
sta smc+2
vert_loop:
txa
clc
adc #2
asl
asl
adc #$40
sbc smc+2
cmp #8
lda #$81
bcs noeor
ora #$02
noeor:
smc:
sta $4400
inc smc+1
inc smc+1
bne noflo
inc smc+2
noflo:
ldy #$60
cpy smc+2
bne vert_loop
inx ; wrap at 7
cpx #7
bne noreset
ldx #0
noreset:
; wait
tya ; wait $60
jsr WAIT
jmp outer_loop
even_lookup:
.byte $D7,$DD,$F5, $D5,$D5,$D5,$D5
odd_lookup:
.byte $AA,$AA,$AA, $AB,$AE,$BA,$EA

View File

@ -17,24 +17,13 @@ FRAME = $FF
; ROM routines
HGR2 = $F3D8 ; set hires page2 and clear $4000-$5fff
HGR = $F3E2 ; set hires page1 and clear $2000-$3fff
HPLOT0 = $F457 ; plot at (Y,X), (A)
HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
COLORTBL = $F6F6
PLOT = $F800 ; PLOT AT Y,A (A colors output, Y preserved)
NEXTCOL = $F85F ; COLOR=COLOR+3
SETCOL = $F864 ; COLOR=A
SETGR = $FB40 ; set graphics and clear LO-RES screen
BELL2 = $FBE4
WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
wires:
jsr HGR2
reset_x:
ldx #$0
outer_loop:
@ -57,8 +46,8 @@ horiz_loop:
lda odd_lookup,X
sta (GBASL),Y
iny
bne noflo2
inc GBASH
noflo2:
@ -68,10 +57,8 @@ noflo2:
bne horiz_loop
lda #$44
sta smc+2
; A should already be $44 here
; Y should be 0
vert_loop:
txa
@ -80,46 +67,31 @@ vert_loop:
asl
asl
adc #$40
sbc smc+2
sbc GBASH
cmp #8
lda #$81
bcs noeor
ora #$02
noeor:
smc:
sta $4400
sta (GBASL),Y
inc smc+1
inc smc+1
inc GBASL
inc GBASL
bne noflo
inc smc+2
inc GBASH
noflo:
ldy smc+2
cpy #$60
lda #$60
cmp GBASH
bne vert_loop
inx
inx ; wrap at 7
cpx #7
bne noreset
ldx #0
noreset:
; wait
lda #100
jsr WAIT
jmp outer_loop
beq reset_x
bne outer_loop
even_lookup:
;.byte $D7
.byte $D7,$DD,$F5, $D5,$D5,$D5,$D5
odd_lookup:
;.byte $AA
.byte $AA,$AA,$AA, $AB,$AE,$BA,$EA