Replacement Schematics PDP-9

This document is a comprehensive collection of circuit diagrams and component information for various modules and subsystems of the Digital Equipment Corporation (DEC) PDP-9 computer. It provides detailed electrical schematics for a wide array of digital and analog circuits, including:

• Data Conversion & Processing: Digital-to-Analog Converters (3-bit and 2-bit), Adders (B131, LINC Adder B132), 3 Bit Parity Circuit B130.
• Logic & Control: Inverters (B104, B105, S107), Diode Gates (B113, B133, R111, R141), Flip-Flops (JAM B213, Dual S202, Triple S203, Dual S205, Dual S206), Binary to Octal Decoder S151, Master Slice Control G008, Control Memory Driver G210, Memory Selector G219, IO Bus Driver W101, Solenoid Driver W040, Indicator Driver W050, Multiplexer Control W104, Comparator W520.
• Timing & Pulse Generation: One Shot Delay B301, Delay Line B310, Delay R302, Delay with Pulse Amplifier B360, Clock Accelerator G903, Clock R401, Crystal Clock R405, Variable Clock R450, 10 Mc Pulse Amplifier B602, Pulse Amplifier S602, Pulse Amplifier S603, Schmitt Trigger W501, Pulse Amplifier W612.
• Power Management: Precision Power Supply A704, Negative Regulator G805, Low Voltage Detector W505, Power Supply 728, Power Supply 728A, Power Supply 779, Power Supply 779A, Power Control 841A.
• Interconnect & Passive Components: Diode Cluster R002, Resistor Board G622, Cable Terminators (G795, W033, W037), Connectors (Digit Stack W015, Word Sink Stack W016, Word Drive Stack W017, Teletype W070, Power W071, I.O. W850), Clamped Loads W005.

Each schematic typically includes a transistor and diode conversion chart (listing DEC and EIA equivalents), a reference to a parts list, and a revision history. The document is stated to be proprietary, furnished for test and maintenance purposes.