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Update: by now the Power Supply and its Sequencing has been fixed and is working. One or a few bits in the MAR seem stuck 'ON'. They cannot be Reset with Clear MAR. M seems to work fine, one can display and set the Registers. Core Memory sometimes seems to work, mostly not. Peculiar: Whether...

One more Picture. In the CHM texts it is mentioned that side panels are missing. Well, they are missing by design, the cabinets were usually placed in a row and bolted together, thus there are only two side panels in total...

I got quite some information down to the "User/Programmer" level that came with the system and from Bit-savers, but nothing deeper. The Connector Signal Assignments of the "RCA Spectra 70 Standard Bus" would be very helpful and should be the same for all the 70 series models, right? I know that...

I got: 4004/15C with 16kB RAM 4004/551 with Interface for CDC 2x CDC 4004/564 without Media 4004/216 Interface and Teletype 4004/243-10 Printer 4004/234-10 Card Punch missing the 4004/4235 Card Reader, still looking for it And missing ALL the external cables... Currently fixing the PS in the...

Well, you might see one working in the future. Currently fixing the Power Supply of a Siemens 4004/15 which is a rebranded Spectra 70/15 with 16k memory option. As such I am in dire search of any hardware documentation. No way to know yet what else might be broken...