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50 lines
1.1 KiB
ArmAsm
50 lines
1.1 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 13.09.2001
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;
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; void pokebsys (unsigned Addr, unsigned char Val);
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; void pokewsys (unsigned Addr, unsigned Val);
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.export _pokebsys, _pokewsys
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.import popsreg
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.importzp sreg, tmp1
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.include "cbm510.inc"
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; ------------------------------------------------------------------------
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;
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.proc _pokebsys
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jsr popsreg ; Get the address
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ldx IndReg
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ldy #$0F
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sty IndReg ; Switch to the system bank
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ldy #$00
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sta (sreg),y
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stx IndReg
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rts
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.endproc
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; ------------------------------------------------------------------------
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;
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.proc _pokewsys
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stx tmp1 ; Save high byte
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jsr popsreg ; Get the address
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ldx IndReg
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ldy #$0F
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sty IndReg ; Switch to the system bank
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ldy #$00
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sta (sreg),y
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iny
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lda tmp1
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sta (sreg),y
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stx IndReg
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rts
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.endproc
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