Path: utzoo!attcan!brian
From: brian@attcan.UUCP (Brian Musker)
Newsgroups: comp.os.cpm
Subject: 1793 Disk Contr. Info?
Message-ID: <11104@attcan.UUCP>
Date: 5 Feb 90 15:26:32 GMT
Reply-To: brian@attcan.UUCP (Brian Musker)
Organization: AT&T Canada Inc., Toronto
Lines: 24


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.

Can anyone confirm the significance of these ports?

    RS1    RS0      PORT
    ========================================
     0      0       READ=STATUS, WRITE=CONTROL
     0      1       READ/WRITE= TRACK
     1      0       READ/WRITE= SECTOR
     1      1       READ/WRITE= DATA

Also, does anyone know what the STATUS/CONTROL flag values might be?

As far as I can tell, STATUS Bit 0 Is Controller Ready for read/write,
and Bit 1 is some sort of Error State.

HELP!

Brian Musker