Editing PDP-8 Documentation (section)

== PDP-8 Maintenance Manual (F-87) ==
DEC's ''PDP-8 Maintenance Manual'', publication F-87, dated February 1966 and printed in March 1966. The scan has 350 pages and no text layer.<ref name="f87" />

Contents, as printed:<ref name="f87" />
# Introduction and description: organisation, functional description, physical description (p. 1-11) and specifications (pp. 1-13 to 1-14).
# Logical functions: power and panel lock switches, power clearing, manual and programmed operation, interrupt and data break.
# Processor: timing, major states, registers, KR01 automatic restart (p. 3-37), Type 182 extended arithmetic element, Type 681 data line interface.
# Core memory: organisation, selectors, inhibit drivers, sense amplifiers, memory control, the current source and Type 708 power supply (pp. 4-12 to 4-13), Type 183 memory extension control, Type 184 memory module and Type 188 parity.
# Input/output: Teletype 33 ASR and its control, Type 189 analogue-to-digital converter, W103 and R123 modules.
# Interface: loading and driving rules, programmed transfer and data break interfaces.
# Installation: site preparation and power requirements.
# Operation: controls and indicators, operating procedures, the RIM loader and PAL.
# Maintenance: equipment (Table 9-1), controls (Table 9-2), preventive maintenance (mechanical, power supply, marginal, memory current and sense amplifier checks, pp. 9-4 to 9-13), corrective maintenance (pp. 9-22 to 9-29) and spare parts (Tables 9-9 to 9-11).
# Engineering drawings: drawing conventions, semiconductor substitution, and schematics of special modules and of the Type 708 power supply (RS-C-708, p. 10-8), G808 control and G809 relay driver.
Appendices: signal origins and the DEC program library.

=== What it does not contain ===
The full logic prints of the processor and memory are not in this manual; DEC supplied them with each machine, and bitsavers holds June 1970 copies as separate files.<ref name="f87" /><ref name="bits" /> The power supply schematic gives values for the large capacitors but prints no voltage rating for the 35,000 µF banks. Table 9-3 prints the −15 V output's current rating as 15 mA, while a working machine draws 9.7 to 9.9 A from it.<ref name="f87" /><ref name="djgps" />

=== Pages that cite it ===
* [[PDP-8]]: specifications and construction
* [[PDP-8 Power Supply Restoration]]: Type 708 description, outputs, capacitor list and checks
* [[PDP-8 General Maintenance]]: preventive maintenance, marginal checks, memory adjustments
* [[PDP-8 Troubleshooting]]: corrective maintenance and memory troubleshooting

<pdf width="800" height="500">File:PDP-8 Maintenance Manual (F-87, 1966).pdf</pdf>

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