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115 lines
2.7 KiB
ArmAsm
115 lines
2.7 KiB
ArmAsm
;
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; Groepaz/Hitmen, 11.10.2015
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;
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; Low level init code for soft80 screen output/console input
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;
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.constructor soft80_init
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.destructor soft80_shutdown
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.import soft80_kclrscr, soft80_charset
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.export soft80_internal_textcolor, soft80_internal_bgcolor
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.export soft80_internal_cursorxlsb
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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
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; FIXME: move charset and this constructor into init segment
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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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; the "color voodoo" in other parts of the code relies on the vram and
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; colorram being set up as expected, which is why we cant use the
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; _bgcolor and _textcolor functions here.
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lda 646 ; use current textcolor
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and #$0f
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sta soft80_internal_textcolor
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lda VIC_BG_COLOR0 ; use current bgcolor
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and #$0f
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sta soft80_internal_bgcolor
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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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ora soft80_internal_textcolor
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sta CHARCOLOR
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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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;-------------------------------------------------------------------------------
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; FIXME: when the code is fixed to use the "init" segment, these variables must
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; be moved into a section other than .bss so they survive after the init
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; code has been run.
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.bss
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soft80_internal_textcolor:
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.res 1
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soft80_internal_bgcolor:
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.res 1
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soft80_internal_cursorxlsb:
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.res 1
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