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Syzygy Magazine 3
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Syzygy_Magazine_3_19xx___pl_Side_A.atr
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lekcja2.arc
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INTOP.ASM
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Assembly Source File
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1988-09-01
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2KB
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1 lines
* Integer operations¢* by Charlie/AR/AwS¢¢ints equ $f9¢inta equ $fa (2)¢intb equ $fc (2)¢intc equ $fe (2)¢¢*--------------*¢¢* c:=a+b¢¢iadd clc¢ lda inta¢ adc intb¢ sta intc¢ lda inta+1¢ adc intb+1¢ sta intc+1¢ rts¢¢* c:=a-b¢¢isub sec¢ lda inta¢ sbc intb¢ sta intc¢ lda inta+1¢ sbc intb+1¢ sta intc+1¢ rts¢¢* c:=a*b¢¢imul jsr isig¢ ldx #0¢ ldy #0¢_ml1 lsr intb+1¢ ror intb¢ bcc _ml2¢ txa¢ clc¢ adc inta¢ tax¢ tya¢ adc inta+1¢ tay¢_ml2 lda intb¢ ora intb+1¢ beq _ml3¢ asl inta¢ rol inta+1¢ jmp _ml1¢_ml3 stx intc¢ sty intc+1¢ lda ints¢ bmi ineg¢ rts¢¢* c:=a div b¢¢idiv jsr isig¢ ldx inta¢ ldy inta+1¢_dv1 sec¢ txa¢ sbc intb¢ tax¢ tya¢ sbc intb+1¢ tay¢ bcc _dv2¢ inc intc¢ bne _dv1¢ inc intc+1¢ bne _dv1 (jmp)¢_dv2 stx inta¢ sty inta+1¢ lda ints¢ bmi ineg¢ rts¢¢* c:=a mod b¢¢imod lda inta+1¢ php¢ jsr idiv¢ jsr iadd¢ plp¢ bmi ineg¢ rts¢¢* c:=-c¢¢ineg sec¢ lda #0¢ sbc intc¢ sta intc¢ lda #0¢ sbc intc+1¢ sta intc+1¢ rts¢¢*--------------*¢¢isig lda #0¢ sta intc¢ sta intc+1¢ lda inta¢ ora inta+1¢ bne _sg0¢ sta intb¢ sta intb+1¢_sg1 pla¢ pla¢ rts¢_sg0 lda intb¢ ora intb+1¢ beq _sg1¢ lda inta+1¢ eor intb+1¢ sta ints¢ lda inta+1¢ bpl _sg2¢ sec¢ lda #0¢ sbc inta¢ sta inta¢ lda #0¢ sbc inta+1¢ sta inta+1¢_sg2 lda intb+1¢ bpl _sg3¢ sec¢ lda #0¢ sbc intb¢ sta intb¢ lda #0¢ sbc intb+1¢ sta intb+1¢_sg3 rts¢¢