15 Jul
2006
15 Jul
'06
2:51 a.m.
On Jul 15 2006, 13:35, Ethan Dicks wrote:
much
good.
issue of
the
On 7/15/06, Jules Richardson <julesrichardsonuk at
yahoo.co.uk> wrote:
> Just going through the motions of reseating chips (again - tried
once, but
doesn't
hurt to do it a second time!)
Doesn't hurt, but if the sockets themselves are a problem, won't do
> Does anyone have a photo, PCB layout, or access to a real board so
that they
can check ROM
chip locations for me?
Alas, no... there's a lot of stuff on zimmers.net (what was formerly
on funet.fi), but I no longer have a static PET... sold it years ago.
> Date codes are all in 1978, so presumably I'm looking at a first > ROMs?
I would say so. BASIC 2 for the newer PETs came out
around
1978/1979,
ISTR; with the upgrade following on its heels. The
only way to be
sure is the part numbers, though (which, I think, have already been
correctly identified by another list member).
Yes, Jules' machine has the first issue. It sounds like he has almost
exactly the same version of machine as I do; mine has the same MPS6540
ROMs and MPS6550 RAMs. Except for the dead ones that I've replaced,
that is: many of those old MOS Technology chips are dying of old age,
and I've replaced three RAM chips in my PET in the last two years.
--
Pete Peter Turnbull
Network Manager
University of York