Apple-2-SW/dos33fsprogs
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text: more sine

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This commit is contained in:
Vince Weaver 2021-04-26 00:48:03 -04:00
parent 6992ced9e5
commit f148cc2f46
1 changed files with 24 additions and 39 deletions
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63
textmode/textscroll/sine.s
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@ -1,5 +1,7 @@
; 134 bytes -- start
; 127 bytes -- merge ypos into one lookup
; 119 bytes -- use BASCALC
; 107 bytes -- use built-in string
CH = $24
CV = $25
@ -59,53 +61,34 @@ next_frame:
text_loop:
tya ; get YY to print at
clc
adc FRAME
; clc
; adc FRAME
and #$f
tax
lda cosine,X ; get cosine (need to rol*3 into BASL/BASH)
sta BASL
lda cosine,X ; get cosine value
jsr BASCALC ; convert to BASL/BASH
asl BASL
rol
asl BASL
rol
asl BASL
rol
; asl BASL
; rol
and #$0f
lda BASH ; add so is proper page
clc
adc DRAW_PAGE
sta BASH
; tay
; lda gr_offsetsh,Y
; clc
; adc DRAW_PAGE
; sta smc+2
; lda gr_offsetsl,Y
; sta smc+1
;
tya
tya ; lookup char to print
clc
adc FRAME
and #$f
taX
tax
; lda apple,X
lda $FB09,X ; 8 bytes of apple II
cpx #8
bcc blah2
; ora #$80
lda #$a0
blah2:
sta (BASL),Y ; print it
lda apple,X
ora #$80
;smc:
; sta $400,X
sta (BASL),Y
dey
dey ; loop
bpl text_loop
flip_pages:
@ -161,12 +144,14 @@ clear_screen_loop:
apple:
; .byte "][ ELPPA"
.byte " APPLE ][ 4EVER "
; .byte " APPLE ][ 4EVER "
cosine:
; .byte 3,3,3,2,2,1,0,0,0,0,0,1,1,2,3,3
.byte 23,23,23,22,22,21,20,20,20,20,20,21,21,22,23,23
; .byte $7d,$7d,$7d,$75,$75,$6d,$65,$65,$65,$65,$65,$6d,$6d,$75,$7d,$7d
.byte $fa,$fa,$fa,$ea,$ea,$da,$ca,$ca,$ca,$ca,$ca,$da,$da,$ea,$fa,$fa
; .byte $fa,$fa,$fa,$ea,$ea,$da,$ca,$ca,$ca,$ca,$ca,$da,$da,$ea,$fa,$fa
; 0111 1101 0111 0101 0110 0101 0110 1101
;gr_offsetsh: