H89 CP/M hard-secored boot diskette

From: Patrick Rigney <patrick_at_evocative.com>
Date: Tue Apr 1 17:25:00 2003

> Hi
> You do know that there is a hardware modification needed to run
> CP/M? As far as I know, this makes it so that it doesn't run
> HDOS. I could be wrong though, it has been a while since I looked
> at this issue.
> You should also try to get a copy of the listing for the hard
> sectored controller as well. I may have a copy of this someplace
> ( it was published by HeathKit ). I think the soft sectored
> code was also published.

Dwight, yes, I had heard that before, and forgotten, so thanks for bringing
it up. IIRC that change was to move the start of RAM to $0000 (CP/M
friendly). Do you recall if there are other changes (other than the impact
this may have on any (EP)ROM that's in the way)?

Thanks for the pointers on the floppy drive... I'll be cracking the case

Received on Tue Apr 01 2003 - 17:25:00 BST

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