History
The Apple II Plus, introduced in June 1979, 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, and became the standard BASIC dialect on the Apple II series. It 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. Like the Apple II, the Apple II Plus had no lowercase functionality. All letters from the keyboard were upper-case, there was no caps lock key, and there were no lowercase letters in the text-mode font stored in the computer's ROM.
Generral
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OVERVIEW |
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| Introduced |
June 1979 |
| Discontinued |
December 1982 |
| Order Number |
A2S1016 (16 KB memory) A2S1032 (32 KB memory) A2S1048 (48 KB memory) |
| Initial Price |
$1195 (16 KB memory) $1295 (32 KB memory) $1395 (48 KB memory) |
| Support Status |
Obsolete |
| Colors |
Beige |
| Weight and Dimensions |
11.5 lbs., 4.25" H x 15.25" W x 18" D |
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PROCESSOR |
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| Processor |
MOS Technology 6502 |
| Processor Speed |
1 MHz |
| Architecture |
8-bit |
| Number of Cores |
1 |
| System Bus |
1 MHz |
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STORAGE AND MEDIA |
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| Storage |
None |
| Media |
Optional Cassette Interface or Disk II floppy drive |
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KEYBOARD |
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| Keyboard |
Built-in 52-key uppercase keyboard |
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Software
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SOFTWARE |
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| Original OS |
Apple DOS 3.2 (initially optional; later included) |
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FIRMWARE |
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| Languages in Memory |
Applesoft BASIC |
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Memory and Graphics
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MEMORY |
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| Built-in Memory |
None |
| Maximum Memory |
48 KB or 64 KB with Language Card |
| Memory Slots |
24 sockets in 3 rows for 16-pin 4 KB (4096, 2104 type) or 16 KB (4116, 2116 type) modules |
| Minimum Speed |
350 ns |
| Language Memory (ROM) |
12 KB |
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GRAPHICS |
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| Display Connection |
1 - RCA for composite video output |
| External Resolution |
280 x 192 (6 colors) or 40 x 48 (16 colors) |
| Text Display |
40 characters per row, 24 rows |
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Connections and Expansion
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CONNECTIONS |
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| Cassette |
1 - in, 1 - out at 1500 bps |
| Game |
1 - internal 16-pin GAME I/O |
| Display |
1 - RCA for composite video output |
| Audio Out |
1 - Built-in 8 ohm speaker |
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EXPANSION |
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| Slots |
8 - 50-pin Apple II peripheral |
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POWER |
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| Line Voltage |
110 or 110/220V AC |
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