Port of Digital Research MAC assembler

[Mark Ogden]

All

I have just posted a port of the old Digital Research MAC assembler to my c-ports GitHub repository

https://github.com/ogdenpm/c-ports

it is a port from the assembler code, largely from the old disassembly done by the late Werner Cirsovius, with a bit of additional analysis by myself using IDA Pro.

A consequence of this is that I have done a number of hacks to work around the unstructured code elements. At some point I may clean up more of the code, as I have already done in places, e.g. I/O and opcode symbol look up.

Although I have done some testing of the port and it appears to work on the samples I have used, if you would like to try it on your own source code, I would be grateful if you could let me know any anomalies or errors that you encounter.

I already know that the file name in the listing against MACLIB is not converted to upper case, which is deliberate as Unix files are case sensitive. Also I trim trailing white space.

The c-ports.pdf documentation under the doc directory documents the command line interface differences from the CP/M original, mainly due modifications on the controls which specified disks; now file names/paths are supported instead.

If you clone the repository, there are visual studio solution files and under the Linux directory there are makefiles to build under Linux.

Mark

[William Beech]

Mark,

I have updated my directory.  I had 12 build errors with your gull project,  but luckily,  MAC built correctly.  I have been using it rebuilding the CPM80 sources and it has behaved as MAC did under CPM80.  Another useful tool added to our repertoire. 

Thanks!

Bill

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[mark.p...@btinternet.com]

Bill

Thanks for highlighting the build errors.

They were not from the MAC, but when I added safeStrdup to my utility library, I had overlooked that there was already one in the shared os.h/os.c files, hence the duplicate error for some applications. As the other applications hadn't changed I hadn't rebuilt them, which would have highlighted the issue earlier.

I have posted the updated shared/os.h and shared/os.c files to Github, the version numbers of the applications hasn't changed.

Mark

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From: intel-...@googlegroups.com <intel-...@googlegroups.com> on behalf of William Beech <nj...@nj7p.org>
Sent: 15 October 2025 00:09
To: intel-...@googlegroups.com <intel-...@googlegroups.com>
Subject: Re: intel-devsys Port of Digital Research MAC assembler

 

To view this discussion visit https://groups.google.com/d/msgid/intel-devsys/9690927d-1091-407f-b32f-40932f1ff0ad%40nj7p.org.