![]() This marked a significant upgrade in program entry interfaces compared to other common home computer BASICs at the time, which typically used line editors, invoked by a separate EDIT command, or a "copy cursor" that truncated the line at the cursor's position. Lines not beginning with a number were executed by pressing the RETURN key whenever the cursor happened to be on the line. If a line was prefixed with a line number, it was tokenized and stored in program memory. Although Commodore keyboards only have two cursor keys which alternated direction when the shift key was held, the screen editor allowed users to enter direct commands or to input and edit program lines from anywhere on the screen. ( Learn how and when to remove this template message)Ī convenient feature of Commodore's ROM-resident BASIC interpreter and KERNAL was the full-screen editor. ( July 2013) ( Learn how and when to remove this template message) Statements consisting only of original research should be removed. Please improve it by verifying the claims made and adding inline citations. This section possibly contains original research. This saved manufacturing costs, as the V2 fit into smaller ROMs. The popular Commodore 64 came with BASIC v2.0 in ROM even though the computer was released after the PET/CBM series that had version 4.0 because the 64 was intended as a home computer, while the PET/CBM series were targeted at business and educational use where their built-in programming language was presumed to be more heavily used. (The easter egg was well-obfuscated-the message did not show up in any disassembly of the interpreter.) However, Microsoft had built an easter egg into the version 2 or "upgrade" Commodore Basic that proved its provenance: typing the (obscure) command WAIT 6502, 1 would result in Microsoft! appearing on the screen. It was not until the Commodore 128 (with V7.0) that a Microsoft copyright notice was displayed. The last, BASIC 10.0, was part of the unreleased Commodore 65.Ĭommodore took the source code of the flat-fee BASIC and further developed it internally for all their other 8-bit home computers. A sprite editor and machine language monitor were added. 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 keywords designed specifically to take advantage of the machine's new capabilities. Later PETs featured BASIC 4.0, similar to the original but adding a number of commands for working with floppy disks.īASIC 3.5 was the first to really deviate, adding a number of commands for graphics and sound support on the C16 and Plus/4. BASIC 2.0 on the C64 was also similar, and was also seen on C128s (in C64 mode) and other models. The original PET version was very similar to the original Microsoft implementation with few modifications. 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 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 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 of 1977 to the C128 of 1985.
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