Apple III Plus Owner's Guide

Preface, p. xiii
1 First Steps, p. 1: plugging in, the power cord, connecting the monitor, disks, starting up, care of the machine
2 The Machine, p. 13: the keyboard, the built-in drive, the text interlace switch (p. 16), the back panel and each port (pp. 17-21), removing the cover and fitting peripheral cards (pp. 22-27), the clock/calendar and the security mount (p. 28), memory (p. 29), radio and television interference (p. 30)
3 Using Your Apple III Plus, p. 33: startup, the video display and text interlace (p. 38), the keyboard, correcting errors, character set and keyboard layout
4 The Operating System, p. 55
5 System Utilities: Device Handling, p. 75
6 System Utilities: File Handling, p. 103
7 System Utilities: SCP, p. 135
A Error and Warning Messages, p. 151, including the power-up diagnostic messages (ACIA, A/D, RAM, ROM, VIA, ZP) on pp. 160-161
B Input/Output Port Specifications, p. 175: joystick ports A and B, RS-232-C serial port, colour and black-and-white video ports, audio port
C The Apple II Emulation Disk, p. 185
D System Specifications, p. 197: operating system (p. 198) and hardware (p. 204)
Glossary, p. 207; Index, p. 223

What it settles

The clock/calendar runs on three AA cells in a clip between the power supply and the speaker, inside the cover. Apple warns that some cells leak, tells owners to check them periodically and not to use carbon-zinc cells (p. 28).
Hardware specifications (pp. 204-205): 17.5 × 18.2 × 4.8 in, 26 lb; 6502B at 2 MHz peak and 1.4 MHz average; minimum 128K RAM; 4K ROM for initialisation and diagnostics; switching supply at +5/−5/+12/−12 V, 100 W maximum, UL/CSA approved; ambient temperature 0 to 45 °C, where the Apple III Owner's Guide gives 15 to 35 °C.
The keyboard has 75 keys (62 main, 13 numeric pad) and five special keys including DELETE, where the Apple III has 74 keys and four (p. 204).
Text interlace gives 560 × 384 dots in 80-column text. Apple says it works best with green-phosphor and other long-persistence displays and needs the vertical hold adjusted (pp. 38-39).
The colour video port "supplies seven different video signals and four power supply voltages" (p. 180).
The security mount is an unthreaded hole 0.25 in across and 0.15 in deep, left of the internal speaker (p. 28).

It is an owner's manual. There are no schematics, board layouts, component lists, take-apart procedures or part numbers. For those see the Apple III/III Plus Technical Procedures (File:Apple III and III Plus Technical Procedures.pdf) and, for the power supply of the original Apple III, Apple's Astec service package (File:Apple Astec Power Supplies Service Package 1982.pdf).

Apple III Plus: specifications, clock/calendar battery, ports, interlace, security mount
Apple III: III Plus temperature range