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64 lines
1.3 KiB
ArmAsm
64 lines
1.3 KiB
ArmAsm
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;
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; Groepaz/Hitmen, 12.10.2015
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;
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; lowlevel kplot function for the soft80 implementation
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;
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.export soft80_kplot
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.import soft80_internal_cursorxlsb
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.include "c64.inc"
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.include "soft80.inc"
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soft80_kplot:
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bcs @getpos
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stx CURS_Y
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sty CURS_X
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sei
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lda $01
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pha
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lda #$34 ; enable RAM under I/O
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sta $01
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; calc pointer to bitmap
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lda soft80_bitmapylo,x
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clc
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adc soft80_bitmapxlo,y
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sta SCREEN_PTR
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lda soft80_bitmapyhi,x
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adc soft80_bitmapxhi,y
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sta SCREEN_PTR+1
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tya
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and #1
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sta soft80_internal_cursorxlsb
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; calc pointer to vram
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tya
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lsr a
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clc
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adc soft80_vramlo,x
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sta CRAM_PTR
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lda #0
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adc soft80_vramhi,x
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sta CRAM_PTR+1
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pla
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sta $01
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cli
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@getpos:
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ldx CURS_Y
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ldy CURS_X
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rts
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;-------------------------------------------------------------------------------
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; force the init constructor to be imported
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.import soft80_init
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conio_init = soft80_init
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