8085 Microprocessor :: Arithmetic Instructions

i) ADD
Syntax: ADD R/M

• e.g. ADD B    ;A<=A+B

ii) ADC
Syntax: ADC R/M

• e.g. ADC B    ;A<=A+B+CY

iii) ADI
Syntax: ADI 8-bit data

• e.g. ADI 45    ;A<=A+45

iv) ACI
Syntax: ACI 8-bit data

• e.g. ACI 45    ;A<=A+45+CY

v) SUB
Syntax: SUB R/M

• e.g. SUB B    ;A<=A-B

vi) SBB
Syntax: SBB R/M

• e.g. SBB B    ;A<=A-B-CY

vii) SUI
Syntax: SUI 8-bit data

• e.g. SUI 45 ; A<=A-45

viii) SBI
Syntax: SBI 8-bit data

• e.g. SBI 45    ;A<=A-45-CY

ix) DAD
Syntax: DAD register pair 

• ;contents of register pair is added to HL and the sum is saved in HL pair.
• e.g. DAD B    ;HL<=HL+BC

x) INR
Syntax: INR R/M

• e.g. INR B    ;B<=B-1

xi) DCR
Syntax: DCR R/M

• e.g. DCR C    ;C<=C-1

xii) INX
Syntax: INX register pair

• e.g. INX H    ;HL<=HL+1

xiii) DCX
Syntax: DCX register pair

• e.g. DCX B    ;BC<=BC-1