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Thread: CP/M-80 on TRS80 Model 100

  1. #1

    Default CP/M-80 on TRS80 Model 100

    Quick note to mention two things.

    First, a new RAM upgrade for M100 is available called REXCPM, and it enables CP/M-80 to operate on M100 with an internal 3.5 MB ramdisk. See

    http://bitchin100.com/wiki/index.php?title=REX

    There is a custom adaptation of CP/M to go with it.


    And then also,
    A NSC800 based dual CPU upgrade for M100 is also available.
    It enables M100 to operate in Z80 mode, allowing for Z80 based CP/M software apps also.

    Details will be posted shortly.

  2. #2

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    Quote Originally Posted by Twospruces View Post
    Quick note to mention two things.

    First, a new RAM upgrade for M100 is available called REXCPM, and it enables CP/M-80 to operate on M100 with an internal 3.5 MB ramdisk. See

    http://bitchin100.com/wiki/index.php?title=REX

    There is a custom adaptation of CP/M to go with it.


    And then also,
    A NSC800 based dual CPU upgrade for M100 is also available.
    It enables M100 to operate in Z80 mode, allowing for Z80 based CP/M software apps also.

    Details will be posted shortly.
    Both sound interesting. Is there any place other than eBay that has NSC800 CPUs in stock? I haven't found any.

  3. #3

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    Quote Originally Posted by Alphasite View Post
    Both sound interesting. Is there any place other than eBay that has NSC800 CPUs in stock? I haven't found any.
    UTSOURCE has stock, they sell via Ebay also. I think they claim some of their parts are "new" while others are used/reclaimed parts.

    Octopart seems to suggest there is stock out there.

    https://octopart.com/search?q=NSC800...cy=USD&specs=0

    https://www.questcomp.com/part/4/nsc800n-3i/283640442

  4. #4

    Default

    Thanks, I'll check for UTSOURCE on eBay. I was worried about getting fake parts from China.

  5. #5
    Join Date
    Oct 2016
    Location
    Illinois, USA
    Posts
    473

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    This is a fascinating development! I look forward to getting my Model 100 fitted.
    General Failure Reading Drive C -
    Abort, Retry, Ignore?

  6. #6
    Join Date
    Aug 2015
    Location
    Virginia, USA
    Posts
    107

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    Quote Originally Posted by Alphasite View Post
    Thanks, I'll check for UTSOURCE on eBay. I was worried about getting fake parts from China.
    The UTSOURCE website might actually be better, I've purchased from them and they are very pro-active with their customer service. The generic LS and HC chips I've purchased from the sellers there have validated on my IC tester (the projects aren't completed yet). The shipping is strange though, so it's worth cross-shopping.

  7. #7

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    Quote Originally Posted by bifo86 View Post
    The UTSOURCE website might actually be better, I've purchased from them and they are very pro-active with their customer service. The generic LS and HC chips I've purchased from the sellers there have validated on my IC tester (the projects aren't completed yet). The shipping is strange though, so it's worth cross-shopping.

    Can you elaborate on your last comment? What is strange, and what is cross shopping? Thanks.

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