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Arithmetic and logical instructions set or reset 4 testable flags. A fifth flag provides decimal arithmetic opera- tion. The 8080A has an external stack Illegal/undocumented instructions Stack, I/O and machine control on 8080 bit is always 1 in PSW); P: Parity flag; set if the number of bits in the Overview of 8080 hardware and instruction set. Description of 8D80/8085 differences. ASSEMBLY LANGUAGE CONCEPTS. General assembly language coding rules. 8080 had seven byte-registers: A, B, C, D, E, H, and L. A was the 8-bit accumulator for most arithmetical and logical instructions and the other six couldThe 8080 microprocessor instruction set includes five different categories of instructions: Data Moving Group: Data moving instruction transfers data between THE 8080 INSTRUCTION SET. 7. ORA Logical or Register or Memory With. ~. ASSEMBLY LANGUAGE. 7. Accumulator. 20. How Assembly Language is Used. 8080 instruction encoding: Conventions in instruction source: D = Destination register (8 bit) S = Source register (8 bit) RP = Register pair (16 bit) # = 8 Intel 8080 instruction set 16bit arithmetic/logical instructions All instructions marked by "*" are only alternative opcodes for existing The 8080 instruction set includes con- ditional branching, decimal as well as binary arithmetic, logical, register-to-register,stack control and memory