Den fre 21 dec. 2018 kl 12:03 skrev Rod Smallwood via cctalk < cctalk@classiccmp.org>:
> It could be a prototype that never made it to production, internal > automated test gear or a bespoke job. > Do you know or just guessing? Why would it be some kind of test gear with a AR, MQ, and MB designation? I searched a bit more and the PDP-6 has exactly AR, MQ and MB registers. My guess it comes from a PDP-6 since it was not used in the PDP-1, PDP-4 and PDP-5 from looking in the maintenance manuals.. Then I found this manual: http://bitsavers.trailing-edge.com/pdf/dec/pdp6/F-67_circuitInstr_May66.pdf Which confirms that is from a PDP-6. Page 3-13. It also makes sense since one of the other boards from the same seller has a tag on it which indicate PDP-6. Case closed.. > > Rod > > > On 21/12/2018 10:49, Mattis Lind via cctalk wrote: > > There is an auction for some kind of early DEC module. It appears to be a > > bit slice of MB, AR and MQ. There is also a signature by Gordon Bell on > the > > board. > > > > But I cannot figure out which early machine it comes from. > > > > > https://www.ebay.com/itm/Vintage-DEC-6205-Arithmetic-Registers-Circuit-Board-for-Vintage-Mainframe/264093791320?hash=item3d7d377458:g:U2AAAOSwpTBcGULN > > > > The same seller has several other pre Flip-Chip modules like 4706 > Teletype > > Receiver. If I read correctly the transistors are dated 1963-1964. > > > > > https://www.ebay.com/itm/Vintage-DEC-4706C-8-Bit-Teletype-Receiver-Circuit-Board-for-Vintage-Mainframe/323607301613?hash=item4b587f8ded:g:AMcAAOSwXF5cGUH9 > > -- > > >
