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Thread: 8008 and Z80 ICEs

  1. #1

    Default 8008 and Z80 ICEs

    Hi all

    I've just completed re-engineering Bob Grieb's Tauntek 8080-ICE as he doesn't make them any more:

    IMG_1172.jpg

    ICE ICE baby.jpg

    I've got permission to offer these, so is there any interest in this board or the Z80-ICE (which I plan to do next)?

    Cheers
    JonB

  2. #2
    Join Date
    Jan 2014
    Location
    Western North Carolina, USA
    Posts
    1,084

    Default

    Yes on the Z80 board. Nice work, by the way.
    --
    Bughlt: Sckmud
    Shut her down Scotty, she's sucking mud again!

  3. #3
    Join Date
    Jul 2014
    Location
    New Hampshire, USA
    Posts
    139

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    Jon -

    Nice work! I arranged a run of the original boards a while back. Unfortunately sourcing the original CPLD was difficult.

    https://www.retrobrewcomputers.org/d...kaufman:z80ice

    I've had occasional requests from folks about availability, so I'm sure there will be interest.

    - Gary

  4. #4

    Default

    Are not the XC9536's hard to get now they have been OOP for quite a few years? Do you plan on redesigning it to remove the obsolete parts?

  5. #5

    Default

    It was redesigned to take the 3.3v variant - 9536XL. There's a jumper onboard to set the CPLD voltage. The one pictured uses the PC44 package (socketed). It works with the 5v and 3.3v part. This means you can use whatever is available. The only fly in the ointment is that there are glitches with the MD and MT commands. I'm looking into it. Otherwise, it works fine.

    To redesign for a newer CPLD would take a lot longer, because I'd have to learn more about CPLDs. But that doesn't seem necessary because I can still order the 3.3v CPLD in an SMT package from Farnell. So a board that can use these chips is do-able, at least for the time being.
    Last edited by JonB; November 9th, 2018 at 11:56 AM.

  6. #6

    Default

    JonB,
    I'm interested in the Z80ICE (one or possibly 2).

    Larry

  7. #7
    Join Date
    Jan 2010
    Location
    Central VA
    Posts
    4,128

    Default

    I'd be interested in one of each. Thanks for reviving this project!

    I was over-excited to see "8008" in the title -- perhaps a moderator can correct that?

  8. #8

    Default

    I've often thought about creating a CPU substitute for these older machine. For the most part, we rarely do development of Z80 and 8080 machines, we are mostly diagnosing and repairing these machines. For diagnosing, we rarely need to run the original code on the machine. In fact, the original code is a poor diagnostic tool. It rarely repeats a sequence but once on reset that we need to analyse. Any need for an ICE to develop a machine can usually be done with a ROM ICE ( a much simpler setup ). We have cheap controllers that run at 72Mhz or greater that can run I/O fast enough to run diagnostics on a 8080 or Z80 bus. The interface would be mostly buffers. No additional programmable devices are needed.
    Dwight

  9. #9
    Join Date
    Sep 2006
    Location
    Silicon Valley
    Posts
    1,616

    Default

    Quote Originally Posted by Dwight Elvey View Post
    We have cheap controllers that run at 72Mhz or greater that can run I/O fast enough to run diagnostics on a 8080 or Z80 bus. The interface would be mostly buffers. No additional programmable devices are needed.
    Dwight
    That's nice.
    Why re-invent the wheel?
    This is a solved problem.

  10. #10

    Default

    Im curious how well the 3.3v CPLD drives 5v TTL CPU lines and downstream TTL logic.

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