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MOS Technology 6522
The 6522 Versatile Interface Adapter (VIA) was an integrated circuit made by MOS Technology, as well as second sources including Rockwell and Synertek. It served as an I/O port controller for the 6502 family of microprocessors, providing the parallel I/O capabilities of the PIA as well as timers and a shift register for serial communications. The 6522 was very popular in computers of the 1980s, particularly Commodore's machines, and was also a central part of the designs of the Apple III, Oric-1 and Oric Atmos, BBC Microcomputer and Apple Macintosh. It was also used in the 1984 through 1989 Corvette digital dash cluster. A high speed, CMOS version, the W65C22S(), is produced by the Western Design Center (WDC).
==Input/output ports==
The VIA contains 20 I/O lines, which are organised into two 8-bit bidirectional ports (or 16 general-purpose I/O lines) and four control lines (for handshaking and interrupt generation). The directions for all 16 general lines (PA0-7, PB0-7) can be programmed independently. The control lines can be programmed to generate an interrupt when activated (all four), latch the corresponding I/O port (CA1 and CB1), automatically generate handshaking signals for devices on the I/O ports, or output a plain High or Low signal.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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