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Deciphering GW-BASIC / BASICA protected programs

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Purpose We describe the deciphering algorithm needed to unprotect source programs stored by GW-BASIC / BASICA.COM. History Microsoft BASIC interpreters were a common way of programming early IBM PC and compatible computers (1981 onwards). Several versions of Microsoft BASIC were used: first IBM...

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The PC-SIG Library and ZIP Files

PCjs offers a variety of online machine emulators written in JavaScript. Run DOS, Windows, OS/2 and other vintage PC applications in a web browser on your desktop computer, iPhone, or iPad. An assortment of microcomputers, minicomputers, terminals, programmable calculators, and arcade machines are also available, along with an archive of historical software and documentation.