9 Dec
2003
9 Dec
'03
12:51 p.m.
I'm working on a ROM emulator for the HP-85 - i.e. a replica of the original (and hard
to find) Programmable ROM Module. From photos (thanks to Vassilis Prevelakis), I've
drawn a schematic of most of the original module. But I've hit a snag where some of
the traces disappear under the ICs. I've been able to deduce most of these but some
are too ambiguous to "pin" down. Is there someone who owns this elusive module
that would be willing to ring some paths for me (probably 10 to 20) ? Some connections may
be obvious simply with a closer visual inspection of the actual module.
Thanks,
Bill