UM6522 adapter equivalent, versatile interface adapter.
* Two 8-bit bidirectional I/O ports
* Two 16-bit programmable timer/counters
* Serial data port
* Single +5V power supply
* TTL compatible expect Port.
The UM6522 Versatile Interface Adapter (VIA) is a very flexible I/O control device. In addition, this device contains a pair of very powerful 16-bit interval timers, a serialto-parallel/parallel-to-serial shift register and input data latching on the.
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