MOS Technology 6501
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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 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 |
