14 Jul
2006
14 Jul
'06
6:15 a.m.
Dave Dunfield wrote:
Physical failures are common in the PET - look for
corroded sockets,
video, power connectors etc.
I didn't see anything first time around (re-seating ICs and connectors was one
of the first things I did), but I'm just going through it again to be sure.
The most common chip failures I enountered were RAMs
(several)
and ROMs (two cases). If you check my site, you can see the interior
shot of one of my 2001s where I had to build a little daughter board
to adapt a 2716 EPROM to fit into the original ROM socket.
Hmm, that actually sounds like a wise move anyway if this machine is going to
be a runnable display system. It's not one of those things that should detract
from any kind of 'value' either, providing any
broken original ROMs are kept
with the machine...
I'll have a look at your images - hopefully there's one where I can make out
the correct ROM locations too :)
I believe the original ROM content is
available on funet - If everything else seems to be OK, you might
try reading the ROMs and checking the content.
Good plan - will do if needed. From the schematic it looks like they're at
least x8 devices, so I should be able to make them look like something that my
programmer can read...
cheers
Jules