MARC (was Re: Thoughts on manual database design?)

Eric Christopherson echristopherson at
Sun Sep 27 19:30:07 CDT 2015

On Sun, Sep 27, 2015, Jay Jaeger wrote:
> On 9/27/2015 12:30 AM, Eric Christopherson wrote:
> > On Tue, Sep 22, 2015, Jay Jaeger wrote:
> >> (BTW, My memory of that acronym is "Machine Assisted Resource
> >> Coordinator", a small-sized Unix work-alike developed by Ed Ziemba (RIP)
> >> using Leor Zolman's BDS C compiler).
> > 
> > I'm having trouble finding much about this system; most of it is on your
> > web page and the Wikipedia page for BDS C, which appears to borrow quite
> > a bit from your page. Was MARC an OS itself, or a Unix-like layer on
> > CP/M? Is it available to download and play with?
> > 
> I'm not surprised, as it was never available as a product.  I originally
> inquired about it after an article about it in the BDS C User's Group
> newsletter, and talked with Ed Ziemba, and he agreed to send me a copy
> to play with / test.  I tested a few versions before Ed Ziemba's
> passing, and did some work on programs like icheck/ncheck/dcheck.
> It was an operating system, not a layer on top of CP/M, although it did
> use the CP/M BIOS calling conventions for the I/O layer.  And, until you
> got your own BIOS integrated into your copy of MARC, it could boot by
> starting up a CP/M program on top of your existing BIOS, which was
> termed a "parasitic boot".

Did it have multitasking?

        Eric Christopherson

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