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Commodore PET 2001
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== Architecture and Processor == At the core of the PET 2001 is the '''MOS Technology 6502''', an 8-bit microprocessor running at '''1 MHz'''. This same CPU would go on to power many other popular systems including the Apple II and Commodore 64. The CPU was tightly integrated with the machine’s system ROM and I/O through custom logic and support chips. The ROM contained '''8 KB of Commodore BASIC 1.0''', developed by Microsoft, and additional routines for input/output operations and system startup. All ROM and RAM chips were socketed on the early PET boards, making upgrades and repairs relatively straightforward.
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