Path: utzoo!attcan!uunet!seismo!esosun!ucsdhub!jack!elgar!ford
From: ford@elgar.UUCP (Mike "Ford" Ditto)
Newsgroups: comp.sys.att
Subject: Re: 3 1/2" on the 7300
Summary: manual floppy-select switch is easy
Keywords: unixpc
Message-ID: <180@elgar.UUCP>
Date: 11 Jun 88 06:15:30 GMT
References: <213@toylnd.UUCP>
Reply-To: ford@kenobi.UUCP (Mike "Ford" Ditto)
Organization: Omnicron Data Systems,  Bonita, CA
Lines: 25

In article <213@toylnd.UUCP> dca@toylnd.UUCP (David C. Albrecht) writes:
>					Tried formatting a disk with 10
>sectors/cyl ala. some of the 5 1/4" distribution disks, uh uh, no good, hangs
>in formatting.

Bummer.  And strange, too, since the 3.5" drives are actually spec'ed
at 800K, while the 5.25's are only rated at 360.

>					Now I'm going to have to figure
>out how to hook it up so I can switch between the 5 1/4 and the 3 1/2
>(visions of 36 pin centronics switch boxes dancing in my head).

Only the drive-select signal would have to be switched (that's what
it's there for), the other 33 pins can be daisy-chained to all floppy
drives.  The floppy driver chips should be able to handle two drives
with no problem at all, maybe even four drives.  But you'll always
have to manually flip the switch, so only one can be in use (open) at
a time.

					-=] Ford [=-

"Once there were parking lots,		(In Real Life:  Mike Ditto)
now it's a peaceful oasis.		ford%kenobi@crash.CTS.COM
This was a Pizza Hut,			...!sdcsvax!crash!kenobi!ford
now it's all covered with daisies." -- Talking Heads