cpmish VS z80-playground-cpm-fat

If you don't find the original and want to do your own, let me gently plug https://github.com/davidgiven/cpmish as a turnkey CP/M build system? Some of the commands are a bit janky but it should be easier than rolling your own. There's a choice of the original DR BDOS and CCP or ZCPR3 and ZSDOS.

I actually have a project where I'm trying to collect provably open source classic CP/M software and integrate it into a turnkey build system, at https://github.com/davidgiven/cpmish/tree/master/third_party. There's some tools there you might find useful, such as a Basic, about three text editors, a good debugger, a shitty Z80 assembler which I wrote (I have yet to find a classic one with a license attached), and a copy of Star Trek. It's aimed at producing bootable disks but as you already have a working system you won't want that, but you should be able to just pull the .COM files out (file a bug and I'll try and make that easier).

Huh. Lost my part-written comment somehow.

Anyway, hi, author/submitter here.

I have heard several versions of this story. Most seem to be unsubstantiated AFAICT.

The one that seems to add up is that Dr Kildall claimed that only he knew why some DOS APIs took the exact parameters they did.

Which ISTM is fair enough, if they were written using DR documentation. As I said, DR intended the API docs to be for app writers, but that didn't stop people using them to write compatible OSes, and lots of companies did.

That's how come David Given's amazing CPMish OS was possible:

https://github.com/davidgiven/cpmish

CPMish combines existing BDOS and BIOS replacements and other components. It puts together so many existing replacement parts for parts of CP/M-80 that nothing of the original was left. Theseus' ship, in software:

https://en.wikipedia.org/wiki/Ship_of_Theseus

There was a code investigation that looked for any DR code in the early MS-DOS binaries:

cpmish is actually mine. It's a proper open-source CP/M clone distribution I've been working on: https://cowlark.com/cpmish/ It's 'ish' because unfortunately Caldera's license for real CP/M has bugs in it and so I can't use any of it. This version's actually using ZCPR and ZSDOS.

I do have CP/M ported to a few of these machines. https://cowlark.com/cpmish/

I've done some reverse engineering on these, and have CP/M running on at least some of them! https://cowlark.com/cpmish/

OTOH the Z80 will run CP/M, or an open source CP/M clone (I made one! http://cowlark.com/cpmish), which will give you access to a huge variety of ancient software which will work out-of-the-box --- excellent if you want a Cobol compiler or to use WordStar. Also, CP/M is pretty easy to port due to its modular design.

http://cowlark.com/cpmish/ is a proper open-source CP/M clone which runs on the Z80. It's based on ZSDOS and ZCPR1, it's got a turnkey cross-compilation build system which builds everything (including utilities written in C which include an assembler, editor and interactive debugger, plus R.T.Russell's superb BBC Basic port) and spits out a disk image file. It contains no Digital Research code for licensing reasons. It's probably the easiest way to get a CP/M clone up and running on now hardware.

Something bespoke.

My code repository contains a link to a youtube channel where the board was discussed, and where I found it randomly. But sadly the upstream site of the provider and the (useful) forums it hosted are gone unless you use the wayback machine:

https://github.com/skx/z80-playground-cpm-fat

That's what I remember too.

I briefly documented how to run Turbo Pascal 3.00A on a CP/M system a while back:

https://github.com/skx/z80-playground-cpm-fat/blob/main/TURB...

I'm doing that on a single-board Z80-based system, and it has to be said that writing pascal is a pleasure on such a machine. 64k of memory, and yet code compiles to real executables "instantly".

This is a copy of CP/M running on a single-board computer. Source code I'm using is here.