Teac fd problem, uPD77C25 data sheet/book & 30-pin SIMMs

From: Mark <mark_k_at_iname.com>
Date: Tue Nov 17 17:59:24 1998

Hi,

Several things in this message.


A 3.5" HD floppy drive in my old PC, Teac model FD-235HF, is showing a fault
which I hope is easily fixable. Here are the details:

- Normally when you insert a floppy disk, the drive motor spins until the
  spindle engages with the rectangular hole in the metal hub of the disk.

- This does not happen with the faulty drive. Well very occasionally it does,
  so I guess the problem may be intermittent. Since the spindle is not engaged,
  trying to read a file or get a dir listing fails -- the motor does not turn
  at all when I try to do this.

- If I manually turn the drive flywheel(?) slightly after inserting a disk, the
  motor does kick in and spins to engage the hub of the floppy disk. It's then
  possible to access the disk as normal.

- The fault is definitely with the drive and not the computer's floppy
  controller (verified by swapping with a different FD-235HF drive).

Any ideas?



The NEC uPD77C25 is some kind of DSP chip. I'm trying to find a data sheet or
data book for this. No luck on searching the NEC web site. Does anyone know
where I can get this?



If anyone (preferably in the UK) has some old 30-pin 1MB or 4MB SIMMs that they
no longer need, please contact me since I could do with at least 2MB worth.
I'm also looking for a 16MHz 387SX chip.


Bye,
-- Mark
Received on Tue Nov 17 1998 - 17:59:24 GMT