CP/M Source Code

http://www.cpm.z80.de/source.html

by kristopolous • 5 years ago

106 32 5 years ago

cpm.z80.de

This isn't just CP/M by far. I suggest the title be changed to "Digital Research Source Code", since that's what's inside the <title> tags.

throwaway815234• 5 years ago

It is also pretty ancient, going back to 2002 or earlier for everything except the Basic/E program. Post title should reflect this.

The source code I'd really like to see is Turbo Pascal 1.x or its CP/M predecessor, but I don't think that was ever released.

pjmlp5• 5 years ago

Here you go, http://pascal.hansotten.com/delphi/turbo-pascal-on-cpm-msx-d...

ngcc_hk• 5 years ago

Surprise by comments; 2002 is very new to me. Use it around 1970s/80s latest. And turbo pascal (I am still playing their turbo bridge) is of 1980s.

hedgewitch• 5 years ago

They just mean that it wasn't posted very recently and want it reflected in the title that this is not a new discovery.

kristopolous• 5 years ago

The original maintainer died in 2001. Maybe they mean new as in a section that was added by someone else. If that's the case here, it's totally acceptable to always have it be called new

cable2600• 5 years ago

It would be good to port this to Game consoles that use the Z80 CPU and hack together a keyboard and SDCard drive. Make them useful. MOst of the CP/M stuff is on the Internet and some is public domain by now.

marcodiego• 5 years ago

MOst of the CP/M stuff is on the Internet and some is public domain by now.

Sure? AFAIK something can only be considered public domain in one of the following conditions:

  - author explicitly uses public domain as a license,

  - 120 after publication,

  - 120 after registration,

  - 95 years after publication if it is corporate work or

  - 75 years after the death of the author; whatever comes first.

rtpg• 5 years ago

Is copyright law dating uniform at this point? I wouldn't be surprised if it is...

one thing I remember reading On The Internet a while back was a theory (from a lawyer I believe?) that stated that you can't just say you put something in the public domain, and have it then be in the public domain.

Like, you can choose to explicitly grant rights of usage, but simply writing "I am putting this work in the public domain" doesn't actually do anything, and is functionally very close to being the same as "all rights reserved".

I don't know if it's true though. I suppose we're fortunate that "nobody around to care" helps in practice for these kinds of conservation efforts that are victimless crimes at best.

laumars2• 5 years ago

Retro games consoles are already useful, as games consoles. People collect and play them still. If anything, modding them into an ultra low powered z80 PC would have less usefulness.

As it happens, there already are a number of z80 micro computers out there. Most of which will already have a CP/M port.

opminion• 5 years ago

Indeed, Amstrad CPC 6128, a home computer which booted to Basic, just like C64 and ZX Spectrum, came with CP/M too.

CodeWriter23• 5 years ago

CP/M has a BIOS interface for such customization. I’ve written more than several. Knock yourself out. NOTE: Digital Research used the term BIOS to describe its device driver interface long before IBM appropriated it for the IBM PC. It’s definitely not the same thing.

pjmlp5• 5 years ago

Look a systems programming language for 8 bit CPUs with safe strings and arrays. /s

ratboy666• 5 years ago

Um... PL/M is not safe, and does not have "safe strings and arrays". It doesn't have strings... It has bytes and addresses.

I hope /s means "sarcastic".

kierenj• 5 years ago

That is indeed what /s means

pjmlp5• 5 years ago

I was being sarcastic, but not in relation to PL/M.

It has subscripted variables with LENGTH() to check its size (aka arrays), and an array of bytes is a string.

You can even create structures of subscripted variables.

PL/M manuals have a couple of examples with string utility functions by the way.

timbit42• 5 years ago

What else would /s mean?

rbanffy2• 5 years ago

Digital Research was the Microsoft we needed.

pjmlp5• 5 years ago

Blame it on how the whole deal with IBM ended up.

rbanffy2• 5 years ago

Wasn’t that because Bill’s mom had a friend on the IBM board?

mistrial9• 5 years ago

I programmed in CP/M as a teen, and it was a different world then.. Byte Magazine was the way to find out about products and development; machines were connected to each other with a serial cable; a modem was used to send bits over a phone line.

Its annoying to see the comment about 'string safety' .. how about you do what you want with your own computer, which is not logged, watched, billed or updated without your consent. This code relates to a machine that you, as an individual, own. An individual person can do what they want with it, without a spy-OS within the CPU itself, for example.

Its clear (to me) that there has to be a serious fork in CPU development, which will need OS software, maybe back to Z80'ish 8 bits even.. This setup wont display JPG at multiple images per second rate from some centralized media servers, but you know, maybe that is a feature.

"free" as in "freedom"

hungryforcodes• 5 years ago

Actually the most recent comment is dated 02/07/2020 -- which I think is pretty good for an operating system that is 40 years old about.

CP/M Source Code

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