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Re: The ideal standalone Z80-based retro computer

Newsgroups comp.os.cpm
Date 2023-07-25 11:05 -0700
References <0b23887c-d521-4424-8e62-8758cb92c763n@googlegroups.com> <d1697505-80d2-4046-a1fc-300842e68c8cn@googlegroups.com> <227e7d81-50fa-42e2-bf7a-ea8907ebe73an@googlegroups.com> <182c1c4f-e39a-459b-87a7-dc0c338122ecn@googlegroups.com> <d8bf334e-03b6-45a3-9fe1-def1bba83192n@googlegroups.com>
Message-ID <edf42535-d7e0-4cb8-b33e-1888a8e89534n@googlegroups.com> (permalink)
Subject Re: The ideal standalone Z80-based retro computer
From Roger Hanscom <norwestrzh@gmail.com>

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I've designed and built a couple of standalone Z80 based SBC's:

One is quite small (maybe 4.75" x 3.75").  It runs at 20 MHz with a full sixteen 8 MB "disks" on compact flash.  It has two serial ports running at 115k baud (one used as a console) via a Z84C4010PEC.  It uses a 128k x 8 SRAM.  The two 64k x 8 halves can be accessed, but I haven't experimented with bank switching at all.  It has a 32k x 8 ROM that contains a monitor, a CP/M 2.2 image, and some utilities.  The ROM can be switched out of the memory map for a (roughly) 55k TPA.  The most interesting part of this SBC is that it can be completely powered from the USB adapter that is the console.  The downside (for some) is the use of a half dozen surface mount 74LS chips.  I've collected a fair number of the old Z80 compilers and got them running (BASIC, C, PL/I, Pascal, and FORTRAN).  It is amazing that these compilers that were so painful to run at 4 MHz, are *very* usable at 20 MHz!

The second is quite a bit larger (maybe 5" x 7").  Same basic features of the Z80 described above, but this one uses a Z85C30 UART for two serial ports (one used as console).  It is fully through hole 74LS, and has a fully TTL compact flash interface.  It can be configured for 32k or 16k banks (using a 512k x 8 SRAM), but again I have not done much with that.  It has a DS1302 RTC (battery backed).  It also has a native USB port based on the DLP-USB245R that is amazingly fast!  Again, a monitor, CP/M 2.2 image, and a number of utilities are stored in a 32k ROM that can be switched out of the memory map.

I'd post photos of both of these Z80's, but I can't see a way to do that here.

As is usually the case, the price of function is complexity, so some of the "wish lists" posted here would possibly have to be constrained by that old adage!

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 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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