The 6501 is an eight-bit microprocessor, the first sold by MOS Technology. The 6501 is the first member of the 65xx series of microprocessors. It was the first microprocessor to be sold for 25 US$ in unit quantities. It was created by several ex-members of Motorola's design team and was pin-compatible with the Motorola 6800 microprocessor. It was not software-compatible, offering several addressing modes not available on the 6800.
The 6502 is a 6501 with the pins re-arranged following a lawsuit by Motorola over the 6501's pin arrangement. As a result of the lawsuit, MOS was forced to pay the legal costs and promise to destroy every 6501 they had manufactured. The 6502 also added a two-phase clock generator, so it only needed a single phase clock input, simplifying system design.
This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL.
| 65xx-series CPUs from MOS Technology, second source/clone vendors, and the Western Design Center |
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MOS 4510 ● MOS 6501 ● MOS 6502 ● WDC 65C02 ● Hudson HuC6280 ● Ricoh 2A03 ● MOS 6507 ● MOS 6508 ● MOS 6509 |
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