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commodore 64 basic
Original title: commodore 64 basic
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Commodore BASIC (also called PET BASIC or CBM-BASIC) is a dialect of the BASIC programming language used in Commodore International's 8-bit home-computer product range, widely used from the PET (1977) through the Commodore 128 (1985).
The core is based on 6502 Microsoft BASIC, and thus shares many features with other 6502 BASICs of the time, such as Applesoft BASIC. Commodore licensed BASIC from Microsoft in 1977 on a “one payment, no royalties” basis. This was because Jack Tramiel rejected Bill Gates’s offer of a fee of 3 dollars per 1 machine, saying “I’m already married,” and refused to pay more than 25,000 dollars for a perpetual license.1
The original PET version closely resembled the original Microsoft version, with only minor changes. The same applied to BASIC 2.0 for the C64, also found on the C128 (in C64 mode) and other models. Later PETs included BASIC 4.0, similar to the original version but with several added commands for operating floppy disks.
Commodore BASIC （ PET BASICまたはCBM-BASICとも呼ばれる）は、 Commodore Internationalの8ビットホームコンピュータ製品群で使用されたBASICプログラミング言語の方言であり、PET （1977年）からCommodore 128 （1985年）まで幅広く使用されました。
コアは6502 Microsoft BASICをベースとしており、そのため当時の他の 6502 BASIC、例えばApplesoft BASICと多くの特徴を共有しています。コモドールは1977 年にMicrosoftから BASIC のライセンスを「一度支払えばロイヤリティなし」という条件で取得しました。これは、ジャック・トラミエルがビル・ゲイツの 1 台あたり3 ドルの料金の申し出を「私はすでに結婚している」と述べ、永久ライセンスに25,000 ドル以上は支払わないと断ったためです。1
オリジナルのPET版は、わずかな変更を加えただけで、オリジナルのMicrosoft版と非常によく似ていました。C64版のBASIC 2.0も同様で、 C128 （C64モード）や他の機種でも見られました。後のPETではBASIC 4.0が搭載され、オリジナル版と似ていましたが、フロッピーディスクを操作するためのコマンドがいくつか追加されました。
Source updated 2026-05-23 · Snapshot 2026-10-08
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