Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!apple!metaphor!djh
From: djh@metaphor.metaphor.com (Dallas Hodgson)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Floppy drive cable for AT bridgeboard?
Keywords: A2286, cable
Message-ID: <1311@metaphor.Metaphor.COM>
Date: 13 Jul 90 18:05:25 GMT
References: <294@smosjc.UUCP>
Sender: news@metaphor.Metaphor.COM
Reply-To: djh@metaphor.metaphor.com (Dallas Hodgson)
Distribution: usa
Organization: Metaphor Computer Systems, Mountain View, CA
Lines: 18

In article <294@smosjc.UUCP> brett@smosjc.UUCP (Brett Coon) writes:
>I tried setting up my A2286 AT Bridgeboard last night, and realized that I
>somehow managed to lose the cable that connects the Bridgeboard with the 5.25"
>disk drive.  I managed to find a cable and the appropriate connectors, but
>when I connected it together, the Bridgeboard wouldn't boot.  According to 
>the manual, the AT cable is supposed to have a few of the wires twisted, which
>(hopefully) explains the problem.  Could someone please tell me which wires
>get twisted so I can fix my cable?

The twist on the cable is a convenience to allow both drive A: and B: to
be drive-select dumpered identically. If you use a flat cable, you can
move one of the drive select jumpers to get the desired effect.

This goes all the way back to TRS-80 days when the long 4-drive floppy cable
connecting the Expansion Interface to the drives had the select pinouts
modified at each connector. If the jumpers aren't right, nothing bad will
happen - either the drive won't select, or it will select simultaneously with
a different drive.