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6d498d8187
to emulate these functions on platforms where one or more of these functions are not available (PET, CBM-II). git-svn-id: svn://svn.cc65.org/cc65/trunk@1544 b7a2c559-68d2-44c3-8de9-860c34a00d81
67 lines
1.1 KiB
ArmAsm
67 lines
1.1 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 PLOT
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.import __VIDRAM_START__
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.importzp crtc
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.include "cbm510.inc"
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.macpack generic
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; ------------------------------------------------------------------------
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;
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.proc 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 #>__VIDRAM_START__
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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 <(__VIDRAM_START__ + 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 >(__VIDRAM_START__ + I * 40)
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.endrep
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.endmacro
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LineMSBTab: LineHiTab
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