Path: utzoo!utgpu!water!watmath!clyde!burl!codas!ufcsv!gatech!mcnc!ecsvax!unbent
From: unbent@ecsvax.UUCP (Jay F. Rosenberg)
Newsgroups: comp.sys.tandy
Subject: Help wanted with ancient TRS80 Model I
Keywords: TRS80 Model I Single Density Disk Drive Help Needed
Message-ID: <4480@ecsvax.UUCP>
Date: 24 Jan 88 18:20:50 GMT
Distribution: na
Organization: UNC Chapel Hill
Lines: 38


Greetings:
     I have just come into possession of a very used TRS80 Model I.  16K 
Level II ROMS, an Expansion Interface with an additional 32K, and a 
26-1160 *single density* minidisk drive.  I'm having some problems with 
the disk drive, and I was hoping someone out there could help.  One 
problem is that I don't have any software.  Specifically, I don't have a 
DOS.  But that's a minor problem.  The major problem is that I can't 
figure out how to hook it up to the Expansion Interface using the cable 
that came with the system.  Details:
     The cable is the standard multi-connector ribbon cable that Tandy 
provides for such things.  There's no problem at the Expansion Interface 
end, but the connector at the *drive* end has no guide pin to guarantee 
correct fit with the edge-card connector in the drive.  Consequently 
there are two ways it can be mated with the drive.  I've tried them 
both.  On the prima facie more plausible way, both the drive motor and 
LED go on and stay on.  So I inverted the connector.  Now the drive 
motor runs for about a second when the computer is powered up (as if it 
were looking for a DOS, all right, and giving up when it didn't find one),
but the LED doesn't come on.  What would settle the question of how to 
mate cable and drive would be the pinout for the drive edge card.  (I 
have the pinout for the Expansion Box edge card.)  Does anyone know what 
it is, top to bottom?  Assuming that the plausible way of mating turns 
out to be the correct way, does anyone know why the motor and LED come 
on and stay on, and what I should do about it?  ANY advice will be 
appreciated.
     Everything else, by the way, is OK -- that is, I can get into 48K 
Level II Basic (for all the good it does me).
     Thanks in advance for any and all help!

JAY ROSENBERG     Dept. of Philosophy     UNC     Chapel Hill, NC   27514
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JAY ROSENBERG     Dept. of Philosophy     UNC     Chapel Hill, NC   27514
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