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  • Re: Any CP/M-Like Work Done for the eZ80?

    From rescueteam@gmail.com@21:1/5 to David Griffith on Wed Mar 9 11:30:07 2022
    On Thursday, November 15, 2012 at 5:32:33 AM UTC+2, David Griffith wrote:
    Paul Bartlett <bart...@panix.com> wrote:
    Just a curiosity question (well, two questions), as I am no longer
    doing anything with Z80/8080 or CP/M. However, my first computer was a Kaypro IV running CP/M 2.2. It is still boxed up in a closet, although
    I don't know if any of the 5 1/4" system diskettes are still bootable.

    As we all know, Zilog came out with the eZ80 CPU, a Z80 workalike (but much faster and more efficient) with an Address and Data Long mode
    capable of linearly addressing 16MB of memory rather than the Z80's
    64KB. (I can remember when some room-filling IBM mainframes had only
    16MB of memory.) Has anyone ever tried to port or adapt any flavor of
    CP/M to the eZ80 while making use of the large memory address space?
    Does anyone know if a manufacturer has ever made a more or less general purpose computer (or advanced programmable calculator) based on the
    eZ80? Thanks.
    Someone created what's called the EZ80SBC, which is precisely what you
    seem to be after. Google tells me that the page for this is http://www.ez80sbc.com/ but nothing is answering. Google will still
    show you useful stuff like pictures, software, and schematics.

    --
    David Griffith
    davidmy...@acm.org <--- Put my last name where it belongs


    Hi David.

    Hoping you are still subscribed to this group, so you can read my message (and maybe reply on it..)
    Recently, I posted this message (below) in the 'Z80-MBC2' Facebook group:

    =====================================
    Hi there.
    I'm actually a relic from the CP/M days (I'm from 1956) and had several SBC's and also CP/M machines, check it out here:(https://tinyurl.com/yckv7tun)
    Clockspeed of my fastest machine (Kaypro 4) was only 2.5 Mhz.
    The Z80-MBC2 runs at 8 Mhz, which is quite impressive.
    Then I asked myself: what is the fastest Z80 available??
    I have seen 12 Mhz Z80's, but then I checked the internet, and I came across a project (July 2007 !!!) of a DIY Z80 based SBC that ran a whopping 50 (!!!) Mhz clockspeed.
    It's an industrial type of Z80: the eZ80.
    Around 2007 or so, some guy (Howard Harte) in Arizona started developing a SBC computer using this lightning fast 50 Mhz eZ80 CPU, and named it: the ez80SBC system.

    There was a website ([http://www.ez80sbc.com but that domain is gone, and so the site disappeared. Luckily we have a great internet 'history book' called 'The WayBack Machine' and thanks to that, we can still see the the ez80SBC project website via this
    URL:
    https://web.archive.org/web/20100604065529/http://www.ez80sbc.com/

    I wonder if we can find some people in our group that would be interesting in building such a lightning 50 Mhz Z80 based system like this.
    Anyone interested??
    Waiting for your comments.....
    Rgds
    Robbert, the dutch guy living in Istanbul... =====================================

    Would be great if you could comment on this.

    Rgds

    Robbert / TA2IX (aka PA3BK)

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Chris B@21:1/5 to rescu...@gmail.com on Sat Mar 12 16:03:17 2022
    On Wednesday, March 9, 2022 at 11:30:09 AM UTC-8, rescu...@gmail.com wrote:
    On Thursday, November 15, 2012 at 5:32:33 AM UTC+2, David Griffith wrote:
    Paul Bartlett <bart...@panix.com> wrote:
    Just a curiosity question (well, two questions), as I am no longer
    doing anything with Z80/8080 or CP/M. However, my first computer was a Kaypro IV running CP/M 2.2. It is still boxed up in a closet, although
    I don't know if any of the 5 1/4" system diskettes are still bootable.

    As we all know, Zilog came out with the eZ80 CPU, a Z80 workalike (but much faster and more efficient) with an Address and Data Long mode capable of linearly addressing 16MB of memory rather than the Z80's 64KB. (I can remember when some room-filling IBM mainframes had only 16MB of memory.) Has anyone ever tried to port or adapt any flavor of CP/M to the eZ80 while making use of the large memory address space? Does anyone know if a manufacturer has ever made a more or less general purpose computer (or advanced programmable calculator) based on the eZ80? Thanks.
    Someone created what's called the EZ80SBC, which is precisely what you seem to be after. Google tells me that the page for this is http://www.ez80sbc.com/ but nothing is answering. Google will still
    show you useful stuff like pictures, software, and schematics.

    --
    David Griffith
    davidmy...@acm.org <--- Put my last name where it belongs


    Hi David.

    Hoping you are still subscribed to this group, so you can read my message (and maybe reply on it..)
    Recently, I posted this message (below) in the 'Z80-MBC2' Facebook group:

    =====================================
    Hi there.
    I'm actually a relic from the CP/M days (I'm from 1956) and had several SBC's and also CP/M machines, check it out here:(https://tinyurl.com/yckv7tun)
    Clockspeed of my fastest machine (Kaypro 4) was only 2.5 Mhz.
    The Z80-MBC2 runs at 8 Mhz, which is quite impressive.
    Then I asked myself: what is the fastest Z80 available??
    I have seen 12 Mhz Z80's, but then I checked the internet, and I came across a project (July 2007 !!!) of a DIY Z80 based SBC that ran a whopping 50 (!!!) Mhz clockspeed.
    It's an industrial type of Z80: the eZ80.
    Around 2007 or so, some guy (Howard Harte) in Arizona started developing a SBC computer using this lightning fast 50 Mhz eZ80 CPU, and named it: the ez80SBC system.

    There was a website ([http://www.ez80sbc.com but that domain is gone, and so the site disappeared. Luckily we have a great internet 'history book' called 'The WayBack Machine' and thanks to that, we can still see the the ez80SBC project website via
    this URL:
    https://web.archive.org/web/20100604065529/http://www.ez80sbc.com/

    I wonder if we can find some people in our group that would be interesting in building such a lightning 50 Mhz Z80 based system like this.
    Anyone interested??
    Waiting for your comments.....
    Rgds
    Robbert, the dutch guy living in Istanbul... =====================================

    Would be great if you could comment on this.

    Rgds

    Robbert / TA2IX (aka PA3BK)

    I designed and built a daughter card for the eZ80 development kit that adds two Compact Flash sockets and 4 additional serial ports. I have a highly modified version of MP/M that provides 6 users and runs in mixed mode. User processes can run as ordinary
    Z80 code or can be ADL mode or even mixed mode processes. Most of the OS code runs in ADL mode. I intend to retire in about a year; continuing efforts is one of the things I intend to spend a lot time doing in my retirement.

    Chris

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)