30 Apr
2013
30 Apr
'13
3:50 p.m.
At 03:59 PM 4/30/2013, Tony Duell wrote:
I've opened up the drive. The external interface is to a "Data Path"
module that has a bunch of TTL and one large chip (40 -pin, probably an
8031) with a Phillips logo. I think this is confirmed to be an LMSI
rebrand.
That Data Path board has an AM26LS31PC line driver and an AM26LS32PC
EIA-422 receiver. I'm going to trace the connector pins to figure out
the likely TX/RX pairs.
Thanks for the info.
-Rick
I haven't
touched the drive. That's got to be the place to do any
effective testing.
If it's any help, the drive I have the docs on shows a TDA8808T for the
'photo didoe signal processor' and a TDA8809T for the 'Radial Error
Processor'.If I am reading it right, it looks like the Eye pattern is on
pin 3 of the TDA8808T