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Color RAM initialization was missing

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git-svn-id: svn://svn.cc65.org/cc65/trunk@959 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2001-09-21 12:55:27 +00:00
parent d694b9e88a
commit edcc015a48
1 changed files with 26 additions and 7 deletions
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33
libsrc/cbm510/clrscr.s
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@ -16,28 +16,47 @@
lda #0
sta CURS_X
sta CURS_Y
jsr plot ; Set cursor to top left corner
jsr plot ; Set cursor to top left corner
lda #$20 ; Screencode for blank
ldx #$00
ldy #$00
ldx #$00 ; Count
jsr clearpage
jsr clearpage
jsr clearpage
ldx #<(40*25)
jsr clearpage ; Clear remainder of last page
jmp plot ; Set screen pointer again
ldx #<(40*25) ; Count
jsr clearpage ; Clear remainder of last page
jmp plot ; Set screen pointer again
.endproc
.proc clearpage
txa
pha ; Save count
lda #$20 ; Screencode for blank
ldy #$00
@L1: sta (SCREEN_PTR),y
iny
dex
bne @L1
inc SCREEN_PTR+1
pla
tax ; Reload count
lda IndReg
pha
lda #$0F
sta IndReg ; Switch to the system bank
lda CHARCOLOR ; Load color
ldy #$00
@L2: sta (CRAM_PTR),y
iny
dex
bne @L2
inc CRAM_PTR+1
pla
sta IndReg ; Restore the old indirect bank
rts
.endproc