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91 lines
1.3 KiB
ArmAsm
91 lines
1.3 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 13.09.2001
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;
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; PLOT routine for the 510.
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;
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.export k_plot
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.importzp crtc
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.include "zeropage.inc"
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.include "io.inc"
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; ------------------------------------------------------------------------
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;
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.proc k_plot
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bcc set
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ldx CURS_Y
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ldy CURS_X
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rts
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set: stx CURS_Y
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sty CURS_X
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lda LineLSBTab,x
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sta CharPtr
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lda LineMSBTab,x
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sta CharPtr+1
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.if 0
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lda IndReg
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pha
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lda #$0F
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sta IndReg
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ldy #$00
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clc
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sei
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sta (crtc),y
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lda CharPtr
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adc CURS_X
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iny
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sta (crtc),y
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dey
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lda #$0E
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sta (crtc),y
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iny
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lda (crtc),y
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and #$F8
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sta sedt1
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lda CharPtr+1
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adc #$00
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and #$07
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ora sedt1
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sta (crtc),y
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cli
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pla
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sta IndReg
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.endif
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rts
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.endproc
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; -------------------------------------------------------------------------
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; Low bytes of the start address of the screen lines
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.rodata
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.macro LineLoTab
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.repeat 25, I
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.byte <(VIDEO_RAM + I * 40)
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.endrep
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.endmacro
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LineLSBTab: LineLoTab
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; -------------------------------------------------------------------------
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; High bytes of the start address of the screen lines
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.macro LineHiTab
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.repeat 25, I
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.byte >(VIDEO_RAM + I * 40)
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.endrep
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.endmacro
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LineMSBTab: LineHiTab
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