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90 lines
1.8 KiB
ArmAsm
90 lines
1.8 KiB
ArmAsm
;
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; Low level stuff for screen output/console input
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;
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.constructor soft80_init, 24
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.destructor soft80_shutdown
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.import soft80_kclrscr
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.import soft80_textcolor, soft80_bgcolor
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.importzp ptr1, ptr2, ptr3
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.include "c64.inc"
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.include "soft80.inc"
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soft80_init:
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lda #$3b
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sta VIC_CTRL1
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lda #$00
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sta CIA2_PRA
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lda #$68
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sta VIC_VIDEO_ADR
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lda #$c8
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sta VIC_CTRL2
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; copy charset to RAM under I/O -> FIXME: generate at runtime
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sei
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lda $01
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pha
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lda #$34
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sta $01
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lda #>soft80_charset
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sta ptr1+1
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lda #<soft80_charset
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sta ptr1
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lda #>soft80_lo_charset
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sta ptr2+1
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lda #<soft80_lo_charset
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sta ptr2
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lda #>soft80_hi_charset
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sta ptr3+1
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lda #<soft80_hi_charset
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sta ptr3
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ldx #4
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@l2:
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ldy #0
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@l1:
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lda (ptr1),y
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sta (ptr2),y
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asl a
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asl a
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asl a
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asl a
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sta (ptr3),y
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iny
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bne @l1
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inc ptr1+1
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inc ptr2+1
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inc ptr3+1
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dex
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bne @l2
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pla
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sta $01
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cli
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lda 646 ; use current textcolor
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jsr soft80_textcolor
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lda VIC_BG_COLOR0 ; use current bgcolor
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and #$0f
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jsr soft80_bgcolor
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jmp soft80_kclrscr
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soft80_shutdown:
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lda #$1b
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sta VIC_CTRL1
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lda #$03
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sta CIA2_PRA
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lda #$15
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sta VIC_VIDEO_ADR
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rts
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soft80_charset:
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.include "soft80_charset.s"
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