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77 lines
1.5 KiB
ArmAsm
77 lines
1.5 KiB
ArmAsm
;
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; Groepaz/Hitmen, 12.10.2015
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;
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; lowlevel kclrscr for soft80 implementation
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;
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.export soft80_kclrscr
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.import soft80_kplot
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.import soft80_internal_bgcolor, soft80_internal_cellcolor
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.importzp ptr1
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.include "c64.inc"
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.include "soft80.inc"
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soft80_kclrscr:
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lda #<soft80_bitmap
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sta ptr1
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lda #>soft80_bitmap
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sta ptr1+1
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lda #$ff
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ldx #$1f
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@lp2:
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ldy #0
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@lp1:
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sta (ptr1),y
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iny
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bne @lp1
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inc ptr1+1
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dex
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bne @lp2
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;ldx #$00
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@lp3:
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sta soft80_bitmap+$1e40,x
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inx
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bne @lp3
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.if SOFT80COLORVOODOO = 1
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lda soft80_internal_bgcolor
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jsr clear ; clear color ram
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.endif
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sei
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ldy $01
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lda #$34 ; enable RAM under I/O
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sta $01
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lda soft80_internal_cellcolor
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and #$f0
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ora soft80_internal_bgcolor
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jsr clear ; clear vram
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sty $01
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cli
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ldx #0
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ldy #0
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clc
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jmp soft80_kplot
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; clear loop for colram and vram
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clear:
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;ldx #$00
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@lp1:
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sta soft80_colram,x
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sta soft80_colram+$100,x
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sta soft80_colram+$200,x
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sta soft80_colram+$2e8,x
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inx
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bne @lp1
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rts
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