Concept

MOS Technology 65xx

Summary
The MOS Technology 65xx series is a family of 8-bit microprocessors from MOS Technology, based on the Motorola 6800 (introduced ca. 1975). The most prolific 65xx part was the 6502, used in home computers such as the PET, VIC-20, Apple II, Atari 8-bit family, and BBC Micro. The 6501 and 6502 have 40-pin DIP packages; the 6503, 6504, 6505, and 6507 are 28-pin DIP versions, for reduced chip and circuit board cost. In all of the 28-pin versions, the pin count is reduced by leaving off some of the high-order address pins and various combinations of function pins, making those functions unavailable. Typically, the 12 pins omitted are the three not connected (NC) pins, one of the two Vss pins, one of the clock pins, the SYNC pin, the set overflow (SO) pin, either the maskable interrupt or the non-maskable interrupt (NMI), and the four most-significant address lines (A12–A15) are the 12 pins omitted to reduce the pin count from 40 to 28. The omission of four address pins reduces th
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