On 01/03/2013 09:19 PM, William Donzelli wrote:
>> Oh?? Well I'm very much a DEChead; I thought DEC designed those
>> originally. I would love to know more about this if you find out more.
> Honestly, I really do not have the time to search my documentation,
> but if I come across something, I will try to remember
> to note it.
Cool, no worries, I was just curious. I've been looking at (fondling,
lusting over) those boards all my life; to hear that those little
handles maybe weren't originally a DEC thing was something I'd never
>> Do you concur with Bill's interpretation of the date codes on the
>> Philco chips?
> Yes, 1968, and the transistors (Fairchild) are also from the same time
> (and I think I saw a datecode on a capacitor, too). It appears that
> the DR may be for "driver", as that seems to be what the circuit is
> laid out to be. The PD993659 is better known as the plain old DTL 936
> hex inverter.
>> Is it possible that these are boards from a clones, like maybe one of
>> the Eastern Bloc machines?
> They do not look Eastern Bloc. Circuit boards from that region have a
> look, just as Japanese boards do.
Oh ok. I've never seen one of those machines (or their guts) in person.
> I suspect these are from some embedded system doing something we may
> never know, from the era when people still liked to use little boards
> all over the place.
Dave McGuire, AK4HZ
New Kensington, PA