Apple II Plus
Apple II Plus with no connections
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| Manufacturer | Apple Computer, Inc. |
|---|---|
| Product family | Apple II series |
| Release date | June 1979 |
| Introductory price | $1195 ($3943 accounting for inflation) |
| Discontinued | December 1982 |
| Operating system |
Apple DOS (originally optional; later stock) Apple Pascal (optional) Apple ProDOS (optional) |
| CPU | MOS Technology 6502 |
| Memory | 16KB, 32KB, 48KB, or 64KB |
| Storage |
Disk II (5.25", 140KB, Apple, later stock) ProFile (5MB/10MB, Apple) UniDisk 3.5 (3.5", 800KB, Apple) |
| Display | NTSC video out (built-in RCA connector) |
| Graphics | Lo-res (40×48, 16-color) Hi-res (280×192, 6 color) |
| Sound | 1-bit speaker (built-in) 1-bit cassette input (built-in microphone jack) 1-bit cassette output (built-in headphone jack) |
| Input | Upper-case keyboard, 52 keys |
| Controller input |
Paddles (Apple and third party) Joystick (Apple and third party) Apple Mouse (Apple) KoalaPad graphics pad/touchpad (third party) |
| Touchpad | KoalaPad graphics pad/touchpad (third party) |
| Connectivity | Parallel port card (Apple and third party); Serial port card (Apple and third party) |
| Backward compatibility |
Apple II (if Language Card installed) |
| Predecessor | Apple II |
| Successor | Apple IIe and Apple III |
| Related articles | Applesoft BASIC |
The Apple II Plus (stylized as Apple ][+) is the second model of the Apple II series of personal computers produced by Apple Computer, Inc. It was sold from June 1979 to December 1982.
The Apple II Plus shipped with 16 KB, 32 KB or 48 KB of main RAM, expandable to 64 KB by means of the Language Card, an expansion card that could be installed in the computer's slot 0. The Apple's 6502 microprocessor could support a maximum of 64 KB of address space, and a machine with 48KB RAM reached this limit because of the additional 12 KB of read-only memory and 4 KB of I/O addresses. For this reason, the extra RAM in the language card was bank-switched over the machine's built-in ROM, allowing code loaded into the additional memory to be used as if it actually were ROM. Users could thus load Integer BASIC into the language card from disk and switch between the Integer and Applesoft dialects of BASIC with DOS 3.3's INT and FP commands just as if they had the BASIC ROM expansion card. The Language Card was also required to use LOGO, Apple Pascal, and FORTRAN 77. Apple Pascal and FORTRAN ran under a non-DOS operating system based on UCSD P-System, which had its own disk format and included a "virtual machine" that allowed it to run on many different types of hardware.
The Apple II Plus included the Applesoft BASIC programming language in ROM. This Microsoft-authored dialect of BASIC, which was previously available as an upgrade, supported floating-point arithmetic (though it ran at a noticeably slower speed than Steve Wozniak's Integer BASIC) and became the standard BASIC dialect on the Apple.
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