12 Mar
2005
12 Mar
'05
2:12 p.m.
The card is recognized by the software and it can
somewhat read data from
the tapes, but it doesn't seem to be processing the data properly, or
something. I got it to work (kind of) once but the directory I pulled
from the tape had numerous errors in it and was basically corrupted. No,
it wasn't the tape, because I have a second exact card (same part number
on the big Motorola chip) and it works fine.
There's a bunch of chips on this board (27) including a Z80, 2764, a bunch
of 74-series stuff, and a few customs AM stuff (PALs, masked ROM, etc.)
Hi,
Missed one, There is one toshiba memory IC (narrow one) next to this
EPROM. I'd change this SRAM first.
Did you do the finger check for thermals? I once fixed a ATI Wonder
800 this way, was a 74xxxx. One was just warmer than others.
By the way, this type of PAL ICs tend to fail often and run hot.
(MMI)
Cheers,
Wizard