> On 16/06/2017 19:02, william degnan via cctech wrote: >> I checked and they are no GE 4000 system boards. >> >> On Fri, Jun 16, 2017 at 12:57 PM, Jon Elson via cctech < >> [email protected]> wrote: >> >>> On 06/16/2017 09:31 AM, David Gesswein via cctech wrote: >>> >>>> Can anyone identify these boards? Person I got them from can't >>>> remember >>>> anything about them. >>>> http://www.pdp8online.com/ftp/misc/unknown_boards/ >>>> >>>> Date codes of 1964. Size 4.5"x3.25". Looks like used card edge for >>>> keying but has separate 23 pin connector for electrical connection. >>>> No useful markings I can see. Has card ## on the back. >>>> >>>> Search by picture didn't find anything. >>>> >>>> Thanks >>>> >>>> They remind me of RCA bizmac boards, which are likely to be related to >>> GE, as that computer division changed hands a number of times. >>> >>> The connectors are Elco Varilok. >>> >>> Jon
On 2017-Jun-16, at 9:31 PM, dwight via cctalk wrote: > The board in the bottom center is 6 buffers or inverters. > > The upper right is 4 flipflops. The upper right is some type > > of decoder( maybe an address or something ). > > The bottom right is a clock generator and the one on the > > lower left looks to be a massive gate, nor or nands depending on the logic > used. > > Function is not the issue, what machine used it is the question. > > Dwight The boards look similar in construction to those in a digital counter from 1961 I have, built by Transistor Specialties Inc.: fiberglass substrate, similar componentry, layout technique, and the Elco edge connectors (those were really nice connectors). Although, other than the edge connectors, a lot of that was similar in that era. I don't have my website up to link to a pic. At first glance I thought that was a crystal for a timebase too on the bottom right board, but it's actually a relay. As Chuck suggests, it strikes me as more or equally likely being from digital test equipment, hard-wired logic controller or such, than being from a computer. Those were the days of building dedicated logic controllers rather than using a computer, for many tasks.
