Editing Apple III Plus Owner's Guide

<pdf> File:Apple III Plus Owners Guide.pdf </pdf>

The '''Apple /// Plus Owner's Guide''' (Apple Computer, Inc.) is Apple's own guide for the [[Apple III Plus]]. Read alongside the [[Apple III Owner's Guide]] it is the clearest statement of what actually changed between the two machines.

== What is in it ==
* '''The clock/calendar battery.''' The III Plus clock/calendar "runs on three size AA battery cells", in a clip "located between the power supply and the speaker on the exterior front wall of the computer well, inside the Apple III's cover". Apple's own warning: "Some types of battery cells are more prone to leak than others. Periodically check your batteries for leakage. When installing or replacing batteries, be sure you do not use carbon-zinc cells."
* Appendix D, System Specifications - the same case and weight as the Apple III (17.5 &times; 18.2 &times; 4.8 in, 26 lb), 6502B at 2 MHz peak / 1.4 MHz average, minimum 128K of RAM, '''4K of ROM for initialisation and diagnostics''', a high-voltage switching supply at +5/&minus;5/+12/&minus;12 V 1 A, UL/CSA approved, 100 W maximum, and '''an ambient temperature range of 0 to 45&nbsp;&deg;C''' where the Apple III's guide gives 15 to 35&nbsp;&deg;C.
* '''75 keys (62 on the main keyboard, 13 on the numeric pad)''' and five special keys - TAB, ESCAPE, RETURN, ENTER and '''DELETE''' - where the Apple III has 74 keys and four.
* The '''text interlace''' mode, 560 &times; 384 dots, which requires a green-phosphor monitor.
* Appendix B, port specifications: the RS-232-C DB-25 pinout, the separate DB-25 disk port carrying up to three daisy-chained Disk III drives, and the 15-pin colour video connector that "supplies seven different video signals and four power supply voltages".
* The security mount - an 0.25 inch unthreaded hole in the baseplate to the left of the internal speaker.

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

== See also ==
* [[Apple III Plus]]
* [[Apple III]]
* [[Apple III Owner's Guide]]

[[Category:Apple Documentation]]
[[Category:Documentation]]
[[Category:Apple Vintage Computers]]