The TRS-80 Journey Continues

Mike Loewen mloewen at
Thu May 5 17:09:22 CDT 2022

On Thu, 5 May 2022, Bill Gunshannon via cctalk wrote:

> On 5/5/22 13:34, Mike Loewen via cctalk wrote:
>>  On Thu, 5 May 2022, Bill Gunshannon via cctalk wrote:
>>>  Next step...
>>>  Apparently mu original Tandon floppy has bought the farm.
>>>  Does anyone know what the jumper setting are for a
>>>  TEAC FD-55GFR-149 for the TRS-80 4P?
>>>  I tried the usual (like for a DEC RX-33) but that didn't
>>>  fly.  Every sector fails verify after a format.  I am sure
>>>  it's a jumper thing.
>>     The FD-55GFR is a 1.2MB drive, double-sided. The Model 4P used 360K
>>  drives (possibly Teac FD-55A), single-sided as installed at the factory.
>>  Are you sure that's the model number that was in your 4P?
> I know it wasn't.  The original was a Tandon 50.  But the TEAC
> FD-55GFR (in various flavors) was used in a lot of systems and
> at least one website said they were used in the 4P.  It is an
> extremely configurable drive that I have used for numerous DEC
> systems (even the infamous RX50!)  I have several of them and
> it should work just fine if I can find the magic jumper combination.
> bill

    This article talks about settings for the FD-55GFR on page 41:

Mike Loewen				mloewen at
Old Technology

More information about the cctalk mailing list