-- vintage 3C RP-31 power supply -- powered the S-Bloc card rack for the world's first Microcomputer Systems developed by 3C: the Computer Control Company - the DDP series: DDP-24/114/224 -- unit measures 15 in. deep with a 5 by 19 in. face plate -- circa 1964 -- likely very rare --
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-- nice overall condition with a few scuffs and stains -- not able to test so sold as is ---- ***** --from the VCFed site:
"Rp-31 8 amp power supply for the S-Bloc3C (Computer Control Company) Card rack, vintage 1964. This card rack is called an S-Bloc, because it uses S-Pac modules. I was told it was from a DDP-24, although I'm not sure of the subtle differences between the DDP-24, DDP-114 and the DDP-224.
These were also sold individually, so you could build your own frankenstein monster.
This was a historic machine for the development of computers in music and art. the computer on which Max Mathews wrote GROOVE and other music software.
3C was bought by Honeywell in 1966" [As the Computer Controls division of Honeywell, it produced digital data processor (DDP) computers until 1970, when Honeywell purchased General Electric’s computer division and discontinued development of the DDP line.]from the adrianwise /co / uk site
"3C digital computers3C began building programmable digital machines in 1963 when the DDP-116, the worlds first 16-bit minicomputer, was designed. At around the same time a 24-bit range of machines was also introduced with the DDP-24 and DDP-224. The 16-bit and 24-bit machines quite clearly exhibit a family resemblance to one another, especially in the design of the instruction set. Both were able to address 215 words. The 24-bit machines providing a simple 15-bit field in the instruction for this purpose. The 16-bit machines in contrast using a 9-bit field and a tenth bit to denote whether the 9-bit address is in the base sector, or in the current sector - that is the sector in which the instruction is located. The 24-bit machines therefore used five additional bits for addressing. One of the other additional bits was used as an additional indexing indicator allowing up to three index registers to be used (the 16-bit machines supporting only a single index register) and the remaining two additional bits were used to extend the operation code from four bits (on the 16-bit machines) to six bits.The 24-bit machines were widely used in flight simulators for planes and space vehicles.The 16-bit machines, in contrast, found application in process control applications. (Although I'm told that my own DDP-516 was taken from a flight simulator, so the boundaries between their application domains weren't set in concrete.) These were some of the first ever uses of computer control in industrial control applications, and they were used in paper, steel and chemical plants."

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