26 Feb
2003
26 Feb
'03
5:39 a.m.
The stock disk controller in the TRS-80 model 3 and 4 will NOT support
the 500K bits per second data transfer rate needed for running 8" drives,
NOR 1.2M 5.25", NOR 1.4M 3.5".
It CAN do 720K 3.5" (250K data transfer rate)
If you "HAVE TO" do 1.2M, there was once a "special" drive from Weltec
that spun at 150RPM, so that it could do 1.2M with PC and XT FDC boards
that only had 250K data transfer rate.
OR, you could get an after-market disk controller that supports 8", etc.
On Wed, 26 Feb 2003, Jeffrey S. Worley wrote:
That 1.2mb drive might actually work. I've used
both 1.44 3.5" and
1.2mb 5.25" drives on my (Now Kurt's) ATR8000. Some of these drives can
be jumpered to emulate 77 track 8" floppy drives.
Regards,
Jeff
-----Original Message-----
From: cctalk-admin(a)classiccmp.org [mailto:cctalk-admin@classiccmp.org]
On Behalf Of Patrick Finnegan
Sent: Tuesday, February 25, 2003 10:38 PM
To: cctalk(a)classiccmp.org
Subject: TRS-80 Model 4 help requested
I recently picked up a TRS-80 model 4, that seems to have problems with
its floppy drives.