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Ancient printed circuit boards of the 1960's,70's or 80's

olddataman

Experienced Member
Joined
May 20, 2003
Messages
94
Location
Bloomingtom, IN
Ancient Printed Circuit Boards

Ancient Printed Circuit Boards

Hi

What kind of boards are you looking for? Have you an applicatioin in mind or are they just for viewing? I know where there are all kinds of boards just looking for a home. Some go back to the 1950's and early 60's. Some are Mil-Spec boards (lot of gold on them) Some are on phonelllic boards most are on fiberglass. Some have IC's and some have discreet components, some even have vacume tube sockets on them.
Are you willing to pay for them and if so, how do we negotiate a price. You will surely have to pay shipping cost from Indiana.
Let me know if you want me to approach the owner. He is a "friend" of mine, but I better play middle man because he is as eccentric as one can imagine. He has about four buildings full of "stuff" that he has bought over the last 10 or 15 years, plus tons of old magazines, tech manuals, trade journals and the like. I drool every time I go to his place.
Ray
 

Exluddite

Experienced Member
Joined
Oct 8, 2004
Messages
81
Location
Manahawkin, NJ
I'm interested in older pcb's myself. What I'm looking to do is use them to more fully understand older technology (like core memory boards) and/or actually use them for odd little projects. I'd put it under the heading of "robotics", but motion isn't really needed. I just want to try to use them interactively.
 

olddataman

Experienced Member
Joined
May 20, 2003
Messages
94
Location
Bloomingtom, IN
Old printed circuit boards

Old printed circuit boards

HI:
I see what you want to do. What you really need is some of what we used to call "logic modules". They were boards made with logic functions on them, the input and output from them brought ot to the pins on an edge connector that the boards were plugged into, Practically all computers, whether general purpose or special purpose, were made that way. (The concept of a single bus bakplane first appeared in the PDP-11 in aout 1970. ) I do not know about every computer but all those I ever worked on (about 25 different models from about 10 different manufacturers) were built that way, and I know that some military stuff was too, like the Appolo on-board computers and some so-called "Mil-Spec" computers that were logically the same as a non-Mil Spec. model from the same company. An example was the Univac 1218 and it's civilian companion the Univac 418. The IBM 1130 and the IBM 1800 were basically the same machine, one made to commercial specs and the other made to meet the more demanding requirements for the process control market. What I would do if I were you would be to write to all of the National Labratories and major research universities and explain what you wish to do and ask them if they have any surplus equipment around that was made using the Logc Modules from Digital Equipment Corp, Scientific Data Systems, Compter Control Corp. that you could get for your work. (Note that SDS became XDS and CCC beca,e Honeywell in the late 1960s)
There is one potential problem to consider. Each company (and I have named only three that we used often) used different voltages for the logical levels. Some used a positive voltage and Gnd to represent a 1 and 0, while another might use Gnd. and a negative voltage to represent a 0 and 1, and others might use the same voltages but with the convention on 1 and 0 inverted. So, you would have to find the appropriate modules to invert and/or convert these logiv levels.
I would suggest that you look through this Forum for someone offering some DEC "Logic Module Handbooks" which would show you what I am discussing far better than I. One thing more that I can think of off the top of my head is that every company that made them used a different Edge Connector.
I like your idea, and would love to do something like it if I had a place to work and wasn't 74 years old and plagued by every sleep disorder known to man. So good luck and I hope you can make sense of this and that it is of some help. If I can help you with a list of places to contact, or anything else, just give me an email via the forum.
Ray
 

Exluddite

Experienced Member
Joined
Oct 8, 2004
Messages
81
Location
Manahawkin, NJ
I hadn't really thought about it in the same way, but yes I suppose some of the older machines were set up to do just the sort of think I'm thinking about. You see the same sort of thing with robotic hobbyists as well. You can build basic controller set ups on a board and then plug it into other system configurations.
Thanks for the input, It's given me quite a bit more to think about.
 
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