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Re: The ideal standalone Z80-based retro computer

Newsgroups	comp.os.cpm
Date	2023-09-08 08:51 -0700
References	(1 earlier) <72829363-c906-4557-ac1c-50a925bc1639n@googlegroups.com> <uc25h5$2chfn$1@dont-email.me> <udbhal$3qm$1@reader2.panix.com> <udc4kl$2udp3$1@dont-email.me> <udcs8c$31t2h$1@dont-email.me>
Message-ID	<53812a97-960c-435a-928b-56c5cff20183n@googlegroups.com> (permalink)
Subject	Re: The ideal standalone Z80-based retro computer
From	Roger Hanscom <norwestrzh@gmail.com>

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On Thursday, September 7, 2023 at 9:03:26 AM UTC-7, pH wrote:
....<snip>......
> What about Steve Ciarcia's (sp?) SB180 single board computer as featured in 
> Byte Magazine (before it's demise). He had a column called "Circuit 
> Cellar", I think. 

Correct on all counts!  The Ciarcia SBC was based on the Hitachi Z180.  IMO, the Z180 is not a good example of a "z80 based" CPU.  It broke the I/O opcodes that used the content of the C register to address ports.  There was a good reason for that (too detailed to go into here), but unfortunately those opcodes were used in a lot of legacy Z80 applications.  It was a nifty way to address multiple I/O ports just by changing the content of C.  In order to run those old Z80 applications on a Z180, the parts of the code that used those opcodes had to be rewritten.

The claim was that the Z180 was 100% binary code compatible with the Z80 was obviously not true, and that might have been a factor in the lack of popularity of that CPU?  It certainly never achieved the same level of acceptance as the venerable Z80!  BTW, that same "glitch" might exist in the eZ80 as well.  I just don't know.

Roger

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The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-07-25 02:30 -0700
  Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-07-25 04:39 -0700
    Re: The ideal standalone Z80-based retro computer Phil G <philg@talk21.com> - 2023-07-25 06:18 -0700
    Re: The ideal standalone Z80-based retro computer Phil G <philg@talk21.com> - 2023-07-25 06:48 -0700
      Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-07-25 07:10 -0700
        Re: The ideal standalone Z80-based retro computer Douglas Miller <durgadas311@gmail.com> - 2023-07-25 07:20 -0700
          Re: The ideal standalone Z80-based retro computer Roger Hanscom <norwestrzh@gmail.com> - 2023-07-25 11:05 -0700
            Re: The ideal standalone Z80-based retro computer Bozo User <anthk@disroot.org> - 2023-07-30 18:53 +0000
              Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-07-31 00:11 -0700
                Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-08-11 05:26 -0700
                Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-08-12 00:16 -0700
                Re: The ideal standalone Z80-based retro computer Bozo User <anthk@disroot.org> - 2024-04-05 22:00 +0000
      Re: The ideal standalone Z80-based retro computer Douglas Miller <durgadas311@gmail.com> - 2023-07-25 07:11 -0700
  Re: The ideal standalone Z80-based retro computer Adam Sampson <ats@offog.org> - 2023-07-25 19:34 +0100
    Re: The ideal standalone Z80-based retro computer Udo Munk <udo.munk@freenet.de> - 2023-07-25 12:39 -0700
      Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-07-25 23:05 -0700
  Re: The ideal standalone Z80-based retro computer yeti <yeti@tilde.institute> - 2023-07-28 05:01 +0000
  Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-19 10:47 -0700
    Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-08-19 22:02 -0700
      Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-20 01:19 -0700
        Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-08-20 11:36 -0700
          Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-20 12:40 -0700
          Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-20 13:03 -0700
            Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-08-21 00:08 -0700
              Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-21 01:03 -0700
                Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-08-21 03:01 -0700
                Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-21 03:11 -0700
                Re: The ideal standalone Z80-based retro computer dxforth <dxforth@gmail.com> - 2023-08-21 20:31 +1000
                Re: The ideal standalone Z80-based retro computer ladislau szilagyi <ladislau_szilagyi@euroqst.ro> - 2023-08-21 05:09 -0700
                Re: The ideal standalone Z80-based retro computer Tadeusz Pycio <tapy@wp.pl> - 2023-08-22 02:34 -0700
                Re: The ideal standalone Z80-based retro computer dxforth <dxforth@gmail.com> - 2023-08-22 21:17 +1000
                Re: The ideal standalone Z80-based retro computer Tadeusz Pycio <tapy@wp.pl> - 2023-08-22 04:44 -0700
                Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-22 05:23 -0700
                Re: The ideal standalone Z80-based retro computer Tadeusz Pycio <tapy@wp.pl> - 2023-08-22 05:56 -0700
                Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-22 06:07 -0700
                Re: The ideal standalone Z80-based retro computer "rwd...@gmail.com" <rwdeane@gmail.com> - 2023-08-22 10:00 -0700
                Re: The ideal standalone Z80-based retro computer dxforth <dxforth@gmail.com> - 2023-08-23 03:36 +1000
                Re: The ideal standalone Z80-based retro computer Tadeusz Pycio <tapy@wp.pl> - 2023-08-22 11:41 -0700
                Re: The ideal standalone Z80-based retro computer dxforth <dxforth@gmail.com> - 2023-08-23 16:10 +1000
                Re: The ideal standalone Z80-based retro computer Chris Syntichakis <csynt8bit@gmail.com> - 2023-08-24 23:37 -0700
                Re: The ideal standalone Z80-based retro computer dxforth <dxforth@gmail.com> - 2023-08-25 20:39 +1000
                Re: The ideal standalone Z80-based retro computer Chris Syntichakis <csynt8bit@gmail.com> - 2023-08-26 00:29 -0700
                Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-27 08:48 -0700
                Re: The ideal standalone Z80-based retro computer dxforth <dxforth@gmail.com> - 2023-08-28 21:35 +1000
                Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-24 11:51 -0700
                Re: The ideal standalone Z80-based retro computer "fridtjof.ma...@gmail.com" <fridtjof.martin.weigel@gmail.com> - 2023-08-26 09:40 -0700
                Re: The ideal standalone Z80-based retro computer Roger Hanscom <norwestrzh@gmail.com> - 2023-08-26 14:39 -0700
                Re: The ideal standalone Z80-based retro computer Zbig <zbigniew2011@gmail.com> - 2023-08-26 16:03 -0700
                Re: The ideal standalone Z80-based retro computer dxforth <dxforth@gmail.com> - 2023-08-27 12:20 +1000
                Re: The ideal standalone Z80-based retro computer Greg Holdren <greg.holdren@gmail.com> - 2023-08-26 18:52 -0700
                Re: The ideal standalone Z80-based retro computer jeffj@panix.com (Jeff Jonas) - 2023-09-07 03:47 +0000
                Re: The ideal standalone Z80-based retro computer jeffj@panix.com (Jeff Jonas) - 2023-09-07 03:50 +0000
                Re: The ideal standalone Z80-based retro computer dxforth <dxforth@gmail.com> - 2023-09-07 19:20 +1000
                Re: The ideal standalone Z80-based retro computer pH <wNOSPAMp@gmail.org> - 2023-09-07 16:03 +0000
                Re: The ideal standalone Z80-based retro computer yeti <yeti@tilde.institute> - 2023-09-07 18:03 +0000
                Re: The ideal standalone Z80-based retro computer pH <wNOSPAMp@gmail.org> - 2023-09-08 21:29 +0000
                Re: The ideal standalone Z80-based retro computer Roger Hanscom <norwestrzh@gmail.com> - 2023-09-08 08:51 -0700
                Re: The ideal standalone Z80-based retro computer pH <wNOSPAMp@gmail.org> - 2023-09-08 21:31 +0000
                Re: The ideal standalone Z80-based retro computer Bill McMullen <mcmullenbill0@gmail.com> - 2023-09-08 16:47 -0700
                Re: The ideal standalone Z80-based retro computer "mrgcm...@gmail.com" <mrgcms2001@gmail.com> - 2023-09-19 08:35 -0700
                Re: The ideal standalone Z80-based retro computer pH <wNOSPAMp@gmail.org> - 2023-09-20 03:04 +0000
                Re: The ideal standalone Z80-based retro computer "pbi...@gmail.com" <pbirkel@gmail.com> - 2023-09-19 23:22 -0700
                Re: The ideal standalone Z80-based retro computer "mrgcm...@gmail.com" <mrgcms2001@gmail.com> - 2023-09-20 12:51 -0700
                Re: The ideal standalone Z80-based retro computer dxforth <dxforth@gmail.com> - 2023-09-09 10:34 +1000
  Re: The ideal standalone Z80-based retro computer andrei-n <andrei.nesterov@gmail.com> - 2023-08-29 09:08 -0700
    Re: The ideal standalone Z80-based retro computer yeti <yeti@tilde.institute> - 2023-08-29 16:29 +0000

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