It was a plug compatible upgrade with a faster processor that incorporated the existing instruction set for programming compatibility, and used smaller " remreed " switches, fewer relays, and featured disk storage.
2.
IBM technical documentation stated that the " PCjr is a different computer than the " PC, but " has a high level of programming compatibility "; it promised software developers that " if your application maintains an interface . . . at the BIOS and DOS interrupt interfaces, then all hardware differences are handled transparently to your application ".
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