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  • Author Author: timswift
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6502 or Z80 Which Is Better?

I have seen lots of discussions on the 6502 and the Z80 microprocessors so I thought I would start this poll.

And be sure to comment on why you voted for the ------ processor!

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  • I've used many old MPUs ranging from COP1802, 2560 SCMP, Z80, 8080, 68xx, 6502 and derivatives (and the list goes on...)

     

    The Z80 and 6502 can't really be compared against each other because of their disparate features.

     

    Here are some aspects;

     

    You can't directly compare clock speeds against each other because the timing of the CPUs differ relative from their system clocks.

     

    The Z80 has many inbuilt registers allowing it to operate without any external RAM whereas the R6502 is dependent upon external RAM at page 0 (0000-00FF) but this RAM at page 0 has special instructions that make extremely versatile.

     

    The Z80 has I/O port addressing which does not consume precious memory space.

     

    The Z80 has inbuilt DRAM refresh circuitry but this is also can be a hinderance.

     

    The Z80 handles the DAA instruction different to the Intel 8080. - It basically corrected it.  This instruction is often used to sense whether an 8080 or Z80 is present.

     

    Z80 peripherals have a daisy chained interrupt priority scheme.

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  • I've used many old MPUs ranging from COP1802, 2560 SCMP, Z80, 8080, 68xx, 6502 and derivatives (and the list goes on...)

     

    The Z80 and 6502 can't really be compared against each other because of their disparate features.

     

    Here are some aspects;

     

    You can't directly compare clock speeds against each other because the timing of the CPUs differ relative from their system clocks.

     

    The Z80 has many inbuilt registers allowing it to operate without any external RAM whereas the R6502 is dependent upon external RAM at page 0 (0000-00FF) but this RAM at page 0 has special instructions that make extremely versatile.

     

    The Z80 has I/O port addressing which does not consume precious memory space.

     

    The Z80 has inbuilt DRAM refresh circuitry but this is also can be a hinderance.

     

    The Z80 handles the DAA instruction different to the Intel 8080. - It basically corrected it.  This instruction is often used to sense whether an 8080 or Z80 is present.

     

    Z80 peripherals have a daisy chained interrupt priority scheme.

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