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40 lines
836 B
ArmAsm
40 lines
836 B
ArmAsm
;
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; Clear (erase) the screen.
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;
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; Support the full 128- x 64-tile background.
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;
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.export _clrscr
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.import plot
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.include "pce.inc"
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.include "extzp.inc"
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_clrscr:
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VREG VDC_MAWR, $0000
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st0 #VDC_VWR
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ldy #$40
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rowloop:
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ldx #$80
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colloop:
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st1 #' ' ; low byte of char. index
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st2 #$02 ; background color, high nybble of char. index
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dex
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bne colloop
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dey
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bne rowloop
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; Go to the home position.
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stz CURS_X
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stz CURS_Y
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jmp plot
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;-------------------------------------------------------------------------------
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; force the init constructor to be imported
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.import initconio
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conio_init = initconio
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