Digital Equipment http://dl.gi.de/handle/20.500.12116/39610 Thu, 23 Jul 2026 07:06:33 GMT 2026-07-23T07:06:33Z digital processor handbook pdp11 / 20, / 15, / r20 http://dl.gi.de/handle/20.500.12116/39613 digital processor handbook pdp11 / 20, / 15, / r20 Fri, 01 Jan 1971 00:00:00 GMT http://dl.gi.de/handle/20.500.12116/39613 1971-01-01T00:00:00Z