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PDP-8/S Frontpanel Bild: PDP-8/S Frontpanel

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Manufacturer: Digital Equipment Corp. Type: PDP-8/S Year: 1967 Serial no.: 862 Technology: discrete transistors (R-Modules) magnetic core memory 4096W * 13Bit Price: below $10000.-

The PDP8-Computer was the world's most common Microcomputer. It was designed with the goal in mind, to offer a computer for less then $10000. It is built with discrete transistors, the same technique as the classic PDP8, which also is a 2nd-generation computer. To keep the price down, the parts of the PDP8/S were designed bit serial. The ALU consists of a 1-bit adder, the datapaths between registers are also 1 bit wide. The memory with a word size of 12 bit + parity bit and the I/O-Bus, as well as the operation codes were implemented in parallel. Logic levels are 0V for logical 0 and -3V for logical 1. As usual with new aquisitions in the museum it doesn't quite work yet, so we are busy with repairs. Things are starting to look better: Except for minor glitches in the frontpanel the machine is up and running again and we are designing an interface for the Teletype.

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