mirror of https://github.com/A2osX/A2osX.git
144 lines
2.2 KiB
Plaintext
144 lines
2.2 KiB
Plaintext
NEW
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PREFIX
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AUTO 4,1
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.LIST OFF
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*--------------------------------------
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* Uses: (pData)
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* M32.ACC .BS 4
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* M32.ARG .BS 4
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* M32.TMP .BS 4
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*--------------------------------------
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* TODO : Make it SIGNED 32 bits
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* TODO : Implement mul, div, mod ...
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* http://6502.org/source/integers/32muldiv.htm
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*--------------------------------------
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M32.Add ldy #M32.ARG+4 ARG+ACC->ACC
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.1 dey
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lda (pData),y
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pha
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cpy #M32.ARG
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bne .1
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ldy #M32.ACC
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ldx #4
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clc
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.2 pla
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adc (pData),y
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sta (pData),y
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iny
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dex
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bne .2
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rts if CS, Overflow
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*---------------------------------------
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M32.Sub ldy #M32.ARG+4 ARG-ACC->ACC
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.1 dey
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lda (pData),y
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pha
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cpy #M32.ARG
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bne .1
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ldy #M32.ACC
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ldx #4
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sec
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.2 pla
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sbc (pData),y
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sta (pData),y
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iny
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dex
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bne .2
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bcs .8 if CC, Overflow
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sec
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rts
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.8 clc
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rts
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*--------------------------------------
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M32.Mul
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*--------------------------------------
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M32.Div
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sec
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rts
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*--------------------------------------
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M32.Mod
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clc
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rts
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*--------------------------------------
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M32.ACC2ARG ldy #M32.ACC+4 ACC->ARG
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.1 dey
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lda (pData),y
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pha
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cpy #M32.ACC
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bne .1
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ldy #M32.ARG
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.2 pla
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sta (pData),y
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iny
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cpy #M32.ARG+4
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bne .2
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rts
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*--------------------------------------
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M32.Cmp ldx #4
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ldy #M32.ARG+3
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.1 lda (pData),y
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pha
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dey
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dex
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bne .1
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ldx #4
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ldy #M32.ACC
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sec
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.2 pla
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sbc (pData),y
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sta (pData),y
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iny
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dex
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bne .2
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bcc .5 CC if ACC < ARG
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ldy #M32.ACC
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lda (pData),y
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iny
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ora (pData),y
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iny
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ora (pData),y
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iny
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ora (pData),y Z if ACC = ARG
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bne .4
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lda #%010 010 ACC = ARG
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rts
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.4 lda #%100 100 ACC > ARG
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rts
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.5 lda #%001 001 ACC < ARG
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rts
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*--------------------------------------
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MAN
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SAVE USR/SRC/X.M32.S
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LOAD USR/SRC/BIN/SHELL.S
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ASM
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