TRS-80 Model 4 help requested

From: Patrick Finnegan <>
Date: Tue Feb 25 21:37:01 2003

I recently picked up a TRS-80 model 4, that seems to have problems with
its floppy drives.

The machine is a base Model 4 with 64KB of ram (I think - haven't yet
taken the EMF shield off the mainboard), and no peripherals attached.
When I powered it up the first time, with or without a disk in the
(bottom) drive, it displayed "Cass?" on the screen, and then I could press
enter to that and the "Memory size?" prompt, and get a basic prompt.

I tried swapping the floppy drives, and that time I got a "Diskette?"
prompt if there was no disk in the drive, and pressing any keys didn't
cause anything to happen. If I put a disk in the drive, the machine never
displays anything, and then after 10-20 seconds, the drive light goes out.

I tried connecting only one drive at a time, with the same results. If I
connected a 1.2MB floppy that I had laying around (a Teac FD-55GFR-149-U),
it did the same thing as if the drives were swapped. Yes, I realize that
the drive probaly wasn't going to work, I just wanted to see if it did

Also, the disk I used was supposed to be a TRS-DOS (bootable) disk, but
it's possible that they've gone bad after so many years. Are the disks on
the Model 4 recorded so that I can read them on a PC (IE 48/96tpi MFM,
compatible with the NEC D765)? I'd like to know if I can make backup
images and/or see if the disks work on another machine.


Purdue Universtiy ITAP/RCS
Information Technology at Purdue
Research Computing and Storage
Received on Tue Feb 25 2003 - 21:37:01 GMT

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