Date   : Mon, 19 Feb 1990 02:11:53 GMT
From   : dino!bischoff@uunet.uu.net (Kurt Bischoff)
Subject: 1793 Disk Contr. Info?

brian@attcan.UUCP (Brian Musker) writes:

>I have almost completed disassembling the ROM from my OSBORNE-I,
>(I will be porting CP/M 3.0 to it), and I can't quite make sense
>out of some of the data being sent to or received from the 1793
>floppy controller.

>HELP!

Back in '85, before I had CP/M, I wrote a disk-formatting program (in Z-80 
machine language) for my Xerox 820.  The 820 uses a WD1771, which I didn't 
attempt to understand in the absence of documents.  So I called a Western 
Digital office and they sent me a copy of their "Storage Management Products 
Handbook", which also has 40 pages of specifications and applications notes 
on the 1793.  I'll send you a copy of the 1793 stuff for $2.  

I guess this is sort of like revealing the end of a mystery story, so it might 
ruin your fun.  8-)   

                               Kurt