Commodore BASIC

BASIC programming language

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From Wikipedia

Commodore BASIC, also known as PET BASIC or CBM-BASIC, is the dialect of the BASIC programming language used in Commodore International's 8-bit home computer line, stretching from the PET (1977) to the Commodore 128 (1985). The core is based on 6502 Microsoft BASIC, and as such it shares many characteristics with other 6502 BASICs of the time, such as Applesoft BASIC. Commodore licensed BASIC from Microsoft in 1977 on a "pay once, no royalties" basis after Jack Tramiel turned down Bill Gates' offer of a $3 per unit fee, stating, "I'm already married," and would pay no more than $25,000 for a perpetual license. The original PET version was very similar to the original Microsoft implementation with few modifications. BASIC 2.0 on the C64 was also similar, and was also seen on C128s (in C64 mode) and other models. Later PETs featured BASIC 4.0, similar to the original but adding a number of commands for working with floppy disks. BASIC 3.5 was the first to really deviate, adding a number of commands for graphics and sound support as well as a mini-assembler integrated into the machine language monitor on the C16 and Plus/4. BASIC 7.0 was included with the Commodore 128, and included structured programming commands from the Plus/4's BASIC 3.5, as well as a sprite editor and keywords designed specifically to take advantage of the machine's new capabilities. The last, BASIC 10.0, was part of the unreleased Commodore 65.

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