NEW PREFIX AUTO 4,1 .LIST OFF *-------------------------------------- * Uses: (pData) * M32.ACC .BS 4 * M32.ARG .BS 4 * M32.TMP .BS 4 *-------------------------------------- * TODO : Make it SIGNED 32 bits * TODO : Implement mul, div, mod ... * http://6502.org/source/integers/32muldiv.htm *-------------------------------------- M32.Add ldy #M32.ARG+4 ARG+ACC->ACC .1 dey lda (pData),y pha cpy #M32.ARG bne .1 ldy #M32.ACC ldx #4 clc .2 pla adc (pData),y sta (pData),y iny dex bne .2 rts if CS, Overflow *--------------------------------------- M32.Sub ldy #M32.ARG+4 ARG-ACC->ACC .1 dey lda (pData),y pha cpy #M32.ARG bne .1 ldy #M32.ACC ldx #4 sec .2 pla sbc (pData),y sta (pData),y iny dex bne .2 bcs .8 if CC, Overflow sec rts .8 clc rts *-------------------------------------- M32.Mul *-------------------------------------- M32.Div sec rts *-------------------------------------- M32.Mod clc rts *-------------------------------------- M32.ACC2ARG ldy #M32.ACC+4 ACC->ARG .1 dey lda (pData),y pha cpy #M32.ACC bne .1 ldy #M32.ARG .2 pla sta (pData),y iny cpy #M32.ARG+4 bne .2 rts *-------------------------------------- M32.Cmp ldx #4 ldy #M32.ARG+3 .1 lda (pData),y pha dey dex bne .1 ldx #4 ldy #M32.ACC sec .2 pla sbc (pData),y sta (pData),y iny dex bne .2 bcc .5 CC if ACC < ARG ldy #M32.ACC lda (pData),y iny ora (pData),y iny ora (pData),y iny ora (pData),y Z if ACC = ARG bne .4 lda #%010 010 ACC = ARG rts .4 lda #%100 100 ACC > ARG rts .5 lda #%001 001 ACC < ARG rts *-------------------------------------- MAN SAVE USR/SRC/X.M32.S LOAD USR/SRC/BIN/SHELL.S ASM