Z-80 and 8080 assembly language programming


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If you count the original processor, its clones and descendants, the Z80 was, and probably still is, the best-selling microprocessor in history. The year marks 40 years that the family has been in production.

ISBN 13: 9780810451674

There is a third aspect which does not have an established name, which is about things like process node, cache size and other optional or configurable parts, Even relying on some invalid operation, happening as a side effect of some efficient way to do something intended, to fail can break someone's workflow if things unexpectedly succeed. If we consider just the instructions themselves there are a few incompatibilities: Overflow flag. On the bit 2 of the flags register only reports the parity of the accumulator after an ALU operation. On the Z it reports parity for logical operations and overflow for arithmetic operations.

Half carry.

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Other flag bits. The Z adds the N flag which records whether the last arithmetic operation was an add or subtract and is use by the DAA instruction. The always sets unused flag bits to 1.


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  5. Instruction timings. Incrementing or decrementing a register pair takes 6 cycles on the Z, 5 on the On the this only works after addition as it lacks the N flag to tell the difference. It may also differ when given unusual inputs. The processor extends the instruction set with entirely different single-byte opcodes.

    Rotates on any register but A. Use of overflow generally uncommon. George Phillips George Phillips 4, 19 19 silver badges 24 24 bronze badges. This has nothing to do with the difference between and Z80, but I'll note here that the actual implementation of IX and IY on the Z80 is that they parallel the HL register set. The oddity is that the gap opcodes do shift left, but insert a constant 1 bit not a copy of the sign bit.

    Aplikasi Z80 Simulator dan Fungsi Perintah Assembler

    A quick way to detect if code is running on an or a Z80 is to use the difference in the way the parity flag behaves: SUB A! The result i've been comparing were carry and resulting accumulator. Z80 rotate instructions clear the A C flag, but the does not. Also, timings are different per-instruction. Joe Joe 6 6 silver badges 12 12 bronze badges. Good reference. I added the half-carry difference to my long-winded answer and made the DAA change certain. Do you think you could include all of the relevant information from the document?

    There's a lot more than that in the source you cite. This does cover what instructions are on the and different on the Z80, not the other way round. Sign up or log in Sign up using Google. Sign up using Facebook. Search refinements Categories.

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    Z-80 and 8080 assembly language programming Z-80 and 8080 assembly language programming
    Z-80 and 8080 assembly language programming Z-80 and 8080 assembly language programming
    Z-80 and 8080 assembly language programming Z-80 and 8080 assembly language programming
    Z-80 and 8080 assembly language programming Z-80 and 8080 assembly language programming
    Z-80 and 8080 assembly language programming Z-80 and 8080 assembly language programming
    Z-80 and 8080 assembly language programming Z-80 and 8080 assembly language programming
    Z-80 and 8080 assembly language programming Z-80 and 8080 assembly language programming
    Z-80 and 8080 assembly language programming Z-80 and 8080 assembly language programming

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