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Recommend me some homebuilt S-100 project resources that will run CP/M?

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    Recommend me some homebuilt S-100 project resources that will run CP/M?

    Hey folks. I've been kinda thinking about wire-wrapping a fairly simple z80 S-100 computer, just for fun, and I'd like it to be able to run CP/M. But I am kind of hoping to base it heavily on (or straight up copy, haha) a design for which there is already a CP/M BIOS available, as I'd kind of like to avoid having to write my own.

    Can you guys recommend any projects that I ought to look at? There are so many out there that I am not sure where to start, heh. I am figuring, CPU/ROM/RAM, serial console for now, probably easiest to use some kind of S-100 CF card solution for storage for now, and maybe try to add a real 8" floppy later on.

    Would it be better if I moved this to the CP/M subforum?

    Thanks!! I apologize for my ignorance in this field.
    -- Lee

    If you get super-bored, try muh crappy Odysee channel: Old Computer Fun!

    Looking For: Type 4 HDC for Tandy II/12/16/6000, Mac IIci hard drive sled, PC-era Tandy stuff, Weird Old Unix Stuff, Aesthetic Old Serial Terminals (HP and DG in particular)

    #2
    What exactly is your objective? Just wire-wrapping S-100 bus cards, or a full CP/M v2.2 system? I've bought a NorthStar Horizon S-100 system in need of restoration, but the logistical problems of getting it and the accompanying 70lb 18" 18MB HD unit across the Pond, plus the Covid-19 restrictions currently in place are causing me serious doubts about the project. System unit is with a friend in Beloit, WI and the HD unit still with the seller in Canada (will be able, eventually, to deliver to London, Ontario for a handover, by arrangement).

    I've not given up on the project, but serious doubts have been introduced by the current world situation.

    Comment


      #3
      There's quite a few Z80 single board computer designs floating around the web as kits etc. A few have schematics posted for the public domain boards. BIOS is available if you copied one of them.
      Crazy old guy with a basement full of Pentium 1 laptops and parts

      Comment


        #4
        Yeah, I'd like to eventually end up with a full CP/M system. I figured maybe I'd make a plexiglass enclosure so the mess of wires could be admired without being exposed for the cat to play with, make an s-100 backplane to go in the bottom, and then make separate CPU/ROM, RAM, serial, etc cards.
        -- Lee

        If you get super-bored, try muh crappy Odysee channel: Old Computer Fun!

        Looking For: Type 4 HDC for Tandy II/12/16/6000, Mac IIci hard drive sled, PC-era Tandy stuff, Weird Old Unix Stuff, Aesthetic Old Serial Terminals (HP and DG in particular)

        Comment


          #5
          Hi,

          I've got a few 8080/z80 based systems. Altair, imsai, and a bench s100 development system. I pick up random boards off ebay and have bought some of the modern retro computer boards.

          Take a look at s100computers.com. Lots of new stuff available.

          I'va also built one of Josh's boards. Will run cpm, get a backplane and a power supply and yor are good to go.

          https://www.ebay.com/itm/Bare-S100-C...wAAOSwBRZcY4~H

          If you take your time you can put together a really nice functional system.

          Good luck!

          Len
          Spread the joy of Vintage Addiction

          -->www.chronworks.com/<--->www.i8008.net/<--

          Comment


            #6
            Another good resource

            https://www.retrobrewcomputers.org/forum/index.php

            Folllow links to the board inventories.
            Spread the joy of Vintage Addiction

            -->www.chronworks.com/<--->www.i8008.net/<--

            Comment


              #7
              Since you are thinking about using CF, Z80 can interface to most CF disks directly, so S-100 format may be an overkill. A simple Z80 CP/M SBC consists of Z80, SIO, RAM, EPROM, oscillator, a couple TTL logic and CF adapter is easy to wirewrap and fit in a 4"x4" board.
              Bill

              Comment


                #8
                Thanks, guys!
                -- Lee

                If you get super-bored, try muh crappy Odysee channel: Old Computer Fun!

                Looking For: Type 4 HDC for Tandy II/12/16/6000, Mac IIci hard drive sled, PC-era Tandy stuff, Weird Old Unix Stuff, Aesthetic Old Serial Terminals (HP and DG in particular)

                Comment


                  #9
                  If you'd like a machine you can literally build on a breadboard Grant Searle's 9-Chip CPM might be a good place to start. It includes a serial port for console, CF interface, and a working version of CP/M 2.2 and bootrom with Microsoft BASIC.
                  My Retro-computing YouTube Channel (updates... eventually?): Paleozoic PCs Also: Blogspot

                  Comment


                    #10
                    Very cool.

                    Although it's not and S-100 card, I've also been looking at the N8VEM board, with the ROMWBW BIOS.
                    -- Lee

                    If you get super-bored, try muh crappy Odysee channel: Old Computer Fun!

                    Looking For: Type 4 HDC for Tandy II/12/16/6000, Mac IIci hard drive sled, PC-era Tandy stuff, Weird Old Unix Stuff, Aesthetic Old Serial Terminals (HP and DG in particular)

                    Comment


                      #11
                      ROMWBW is really the best you can get these days, and it's regularly updated. ZETA SBC may be a better option than the older N8VEM design.

                      Have you looked at the RC2014 boards available? If you're looking to put together a simple CPM system that you can do a bit more customization on than the N8VEM, there's a ton of available boards and designs out there for that. If you don't want a floppy drive, you could check out the Easy Z80 board, which provides ROMWBW, two serial ports, 512k battery backed RAM and an RC2014 interface for a CF storage card.

                      Comment

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