Shortly after the introduction of the II Plus in 1979, Microsoft came out with the Z-80 SoftCard, an expansion card for the Apple II line that allowed the use of CP/M and contained its own Z80 CPU and logic to adapt the Z80 CPU to the Apple bus. The first-year Apple II Plus retained the original Apple II's jumper blocks to select the RAM size, but a drop in memory prices during 1980 resulted in all machines being shipped with 48K and the blocks being removed. 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 Language Card was also required to use LOGO, Apple Pascal, and FORTRAN 77. 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. 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. The Apple's 6502 microprocessor could support a maximum of 64 KB of address space, and a machine with 48 KB RAM reached this limit because of the additional 12 KB of read-only memory and 4 KB of I/O addresses. 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 II Plus (stylized as Apple ] Approximately 380,000 II Pluses were sold during its four years in production before being replaced by the IIe in 1983. Parallel port card (Apple and third party) KoalaPad graphics pad/ touchpad (third party) Apple DOS (originally optional later stock)ĭisk II (5.25", 140 KB, Apple, later stock)ġ-bit cassette input (built-in microphone jack)ġ-bit cassette output (built-in headphone jack)
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