29890RE: [midatlanticretro] How do I make boot floopy? IMSAI + Northstar + CP/M?
- Mar 26, 2013I just looked. MDC-A4 is the floppy controller.
Looks like a video card, and there is a serial card but I haven't
identified it. The cards are in there... very tough to pull out.
4 ram cards as well.
I'm going to look to replace the 4 huge electrolytic caps on the psu.
On Tue, 26 Mar 2013, Bill Sudbrink wrote:
> Systems Glitch wrote:
>> Depending on the card you're using, you can set it up to appear
>> enough like the North Star serial interface to get things up and
> That's a pretty major "depending". There seem to have been dozens
> of different serial cards, each using different I/O addresses,
> different bits in the byte to indicate status. That's why Processor
> Tech went to such lengths on the 3P+S. You could strap everything
> on that card.
>> Or you can patch the I/O routines into the OS once it loads from disk
> Or you could patch the diskette image before you transfer it from the
> PC to the IMSAI.
>> You may also run into an issue with which North Star controller you
>> have -- there are two, a single-density version (old, original one) and
>> the double-density version (used in the Horizon).
> I'll bet you a beer at the next VCF East that, if he has a N* controller,
> it's an mds-ad3. I have one single density controller -vs- a whole
> stack of ad3s. Totally by accident, found at random as I've added to
> my collection.
>> There are more pre-built OS disks available for the double-density
>> version. I've yet to find a prebuilt CP/M image for the single-density
>> controller (does anyone know of one? I'm almost certain they had to
>> have existed at one point).
> I think I have the tools to generate a single density CP/M boot disk.
> Remind me when the next VCF gets closer and I'll try to make you one.
> Bill S.
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