Hello alltogether,
i am restoring a PDP8A at the moment. The machine got a problem in the
Powersupply. I think one of the emergency ciruits trigger a shutdown of
PSU. In tracing this isue i hab two questions.
My 8A`s manufacturing year is 1977. It`s model is 8A620. On Bitsavers i
found a matching shematic for the BA8C Power distribution Board from
1976 (File: EK-8A002-MM-002_PDP-8A_Miniprocessor_Users_Manual_Dec76.pdf
page 597). The Board Number is 5412000-0-1.
My first question is if somone has the Board Layout with it's component
locations?
My second question is about the DEC4011 Chips. As i inspected the Board
i found the DEC4011 Chips. First i think they are the standard CMOS 4011
quad two-input NAND`s. In the shematic it look more like a four
Transistor array. Did anyone know somthing aput these Chips? Are there
any equivalent parts? Have anyone a Datasheet of it?
Marco
