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kfest: have it scrolling page0 hello

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This commit is contained in:
Vince Weaver 2018-07-18 21:39:36 -04:00
parent afa8586bac
commit 0825593c8e
1 changed files with 49 additions and 6 deletions
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55
kfest2018/raster.s
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@ -2,6 +2,7 @@
; Zero Page
DRAW_PAGE = $EE
CURRENT_OFFSET = $EF
; Soft Switches
@ -14,7 +15,7 @@ LORES = $C056 ; Enable LORES graphics
TEXT = $FB36 ;; Set text mode
HOME = $FC58 ;; Clear the text screen
WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
;===================
@ -25,6 +26,7 @@ HOME = $FC58 ;; Clear the text screen
lda #0
sta DRAW_PAGE
sta CURRENT_OFFSET
; Clear Page0
lda #$00
@ -118,8 +120,33 @@ loopB:
display_loop:
loop_forever:
jmp loop_forever
ldy CURRENT_OFFSET
ldx #0
data_loop:
lda words,Y
sta $6d0,X
lda words2,Y
sta $750,X
lda words3,Y
sta $ad0,X
lda words4,Y
sta $b50,X
iny
inx
cpx #40
bne data_loop
inc CURRENT_OFFSET
lda #128
jsr WAIT
jmp display_loop
;==================================
@ -127,7 +154,7 @@ loop_forever:
;==================================
; Color in A
; X has which line
; Y has which line
hline:
pha ; 3
ldx gr_offsets,y ; 4+
@ -157,13 +184,29 @@ clear_page_loop:
bpl clear_page_loop
rts
.align $100
words:
; H E L L O
.byte $D1,$00,$D1,$00, $D1,$01,$00, $D1,$00,$00, $D1,$00,$00, $D0,$01,$D0,$00
.repeat 239
.byte $0
.endrep
words2:
.byte $24,$04,$24,$00, $24,$20,$00, $24,$20,$00, $24,$20,$00, $04,$20,$04,$00
.repeat 239
.byte $0
.endrep
words3:
.byte $C9,$C0,$C9,$00, $C9,$C0,$00, $C9,$00,$00, $C9,$00,$00, $C9,$00,$C0,$00
.repeat 239
.byte $0
.endrep
words4:
.byte $06,$00,$06,$00, $06,$00,$00, $06,$00,$00, $06,$00,$00, $06,$00,$06,$00
; move these to zero page for slight speed increase?
.repeat 239
.byte $0
.endrep
gr_offsets:
.word $400,$480,$500,$580,$600,$680,$700,$780