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From: bdale@winfree.UUCP (Bdale Garbee)
Newsgroups: comp.sys.misc
Subject: Re: Cheap external floppy for Toshiba T1100+ (and T3100?)
Message-ID: <66@winfree.UUCP>
Date: Mon, 13-Jul-87 02:58:16 EDT
Article-I.D.: winfree.66
Posted: Mon Jul 13 02:58:16 1987
Date-Received: Tue, 14-Jul-87 06:29:08 EDT
References: <8707030732.a029212@Louie.UDEL.EDU> <425@psu-cs.UUCP> <17392@amdcad.AMD.COM>
Sender: bdale@winfree.UUCP
Reply-To: bdale@winfree.UUCP (Bdale Garbee)
Distribution: world
Organization: Bdale's Berkeley Box, Colorado Springs
Lines: 49

In article <17392@amdcad.AMD.COM> rpw3@amdcad.UUCP (Rob Warnock) writes:
>Unfortunately, Toshiba doesn't document the pinouts on the 25-pin connector
>on the back, the one that's shared between the external floppy (can be either
>disk "A" or "B") and the parallel printer. So I engaged in a little electrical
>sleuthing, and figured it out the hard way 

Wrong.  It just isn't in the manuals that come with the box.  Would you give
a software jock connector pinouts?  That's *DANGEROUS*!  Toshiba does run a
customer support BBS at 1-714-837-4408, 1200 baud only.  I got the number by
calling the 800 voice number and asking a techie-type question.  There is a
file on the board called 3100-ibm.txt, which docs the cable in question, along
with files that doc all the other connectors.  Sorry you went to so much
trouble before you asked!

Here's the file, I haven't bothered to check your work Rob:

 1100+ or 3100 to IBM Floppy Disk

	Male DB-25 to 34 pin Card Edge connector

		1	33 & 34
		2	8
		3	26
		4	28
		5	30
	   6 to 9 nc
		10	12
		11	16
		12	22
		13	24
		14 nc
		15	32
		16	18
		17	20
	  18 to 25	All odd pins


>You need a convenient way to scramble-wire the 25-pin DB-25 on the back
>of the T1100+ to the 34-pin PC edge-connector on the floppy. 

I just crimped ribbon cable into an edge connector, flared the other end, and
soldered the individual wires to the tabs of a solder-cup style DB25.  Works
great with a shell around the DB25 for strain relief.  Has been in use for
months... (how did you think I got Minix on the Toshiba in the first place!!)
-- 

Bdale Garbee, N3EUA		phone: 303/593-9828 h, 303/590-2868 w
uucp: {bellcore,crash,hp-lsd,hpcsma,ncc,pitt,usafa,vixie}!winfree!bdale
fido: sysop of 128/19		packet: n3eua @ k0hoa, Colorado Springs