Editing Apple III Owner's Guide (section)

== What is in it ==
* Size '''17.5 in (44.45 cm) wide, 18.2 in (46.23 cm) deep, 4.8 in (12.19 cm) tall'''; cast aluminium base with a moulded plastic cover; weight '''26 lb (11.8 kg)'''.
* Processor "based on the 6502B microprocessor, with extended addressing capability"; clock '''2 MHz peak, 1.4 MHz average'''.
* Main memory 128K of dynamic RAM. '''ROM memory: 4K, for initialisation and diagnostics''' - SOS and the languages load from disk.
* Power supply: high-voltage switching type, '''+5, &minus;5, +12, &minus;12 volts'''; 100 watts maximum, 107 to 132 volts, 60 Hz.
* '''Ambient temperature 15 to 35&nbsp;&deg;C''', "critical factor is deformation temperature of diskette cases".
* Three text modes (40&times;24 and 80&times;24 black-and-white, 40&times;24 in 16 colours) and four graphics modes (280&times;192 black-and-white, 280&times;192 in 16 colours, 140&times;192 full 16 colour, 560&times;192 black-and-white).
* Video: an RCA phono connector carrying '''black-and-white composite only''', and a DB-15 carrying black-and-white composite, colour composite, RGB, composite sync and the four supply rails. Colour signals appear as a 16-level grey scale on the black-and-white outputs.
* Audio: built-in 2-inch speaker and a miniature phone-tip jack, with '''three audio generators''' - a 64-level 6-bit DAC port, a one-bit square-wave generator and a fixed-frequency beep - producing tones from 31 to 5090 Hz.
* One RS-232-C DB-25 female serial connector; two DB-9 joystick connectors; one DB-9 shared with the first joystick for the Silentype printer; '''four 50-pin expansion slots''' inside the cabinet.
* Keyboard: 74 keys, 61 on the main keyboard and 13 on the numeric pad.
* Mass storage: one built-in 5.25-inch drive, 143,360 bytes per diskette, with up to three more on a daisy chain.

Download: [[:File:Apple III Owners Guide 1981.pdf|Apple III Owners Guide 1981.pdf]]