TRS-80 Model III

From: Chandra Bajpai <>
Date: Wed Aug 7 06:16:00 2002

What happens if you press the <Break> key down while powering
should take you into ROM Basic with a "cass?" prompt.

I grew up with a Model III and it's been a while, but I don't remember
there being an error message if it doesn't find disk in the drive.
Matter of fact I don't remember any text error messages from the boot

If you can get into ROM Basic, it probably means you have a bad boot


-----Original Message-----
From: []
On Behalf Of Sellam Ismail
Sent: Tuesday, August 06, 2002 3:32 PM
To: Classic Computers Mailing List
Subject: TRS-80 Model III

I am trying to get a TRS-80 Model III working. When I turn it on the
drive spins for a while looking for a disk I presume. All I get on the
screen are wispish diagonal lines as if the horizontal hold is all

I managed to unstick one of the video adjustment knobs on the left
underside but all it does is affect the brightness level. The other one
requires a screwdriver to move at all (shimmying it up and down) and
not seem to affect the display. I haven't opened it yet to see what
adjustments are inside. I'd rather not, but there don't seem to be any
adjustment pots accessible from outside the case.

What's weird is that I have access to a bunch of TRS-80 Model 3's here
the ACCRC and pretty much all of the ones I have played with so far are
basically "dead" in this manner. The one I'm working on just came in
today and is in the same state. Also, the video knobs on the left
underside are all stuck on everyone I've tried to get working. What is
the deal with that? Do they get rusted over time or something? Very

The fact that the disk drive spins up when I turn it on is a good sign I

Any help on this would be appreciated. I know next to zero about the
TRS-80 series.

Sellam Ismail Vintage Computer
International Man of Intrigue and Danger

 * Old computing resources for business and academia at *
Received on Wed Aug 07 2002 - 06:16:00 BST

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