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66 lines
1.0 KiB
ArmAsm
66 lines
1.0 KiB
ArmAsm
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; Ullrich von Bassewitz, 13.09.2001
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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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.macpack generic
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; ------------------------------------------------------------------------
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;
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.proc k_plot
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bcs get
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stx CURS_Y
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sty CURS_X
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lda LineLSBTab,x
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sta SCREEN_PTR
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sta CRAM_PTR
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lda LineMSBTab,x
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sta SCREEN_PTR+1
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sub #>VIDEO_RAM
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add #>COLOR_RAM
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sta CRAM_PTR+1
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get: ldx CURS_Y
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ldy CURS_X
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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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