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**W86C452   I/O controller for IBM PC/AT                         Jul89
***Info:...
***Versions:...
***Features:
o  Easily interfaces to most popular microprocessors.
o  Dual-channel version of W86C450
o  Centronics printer interface
o  Independently controlled transmit, receive, line status, and data 
   set interrupts.
o  Programmable baud generator allows division of any input clock 
   by l to (2^16 -l) and generates the internal 16 x clock.
o  Independent receiver clock input.
o  MODEM control functions (CTS, RTS, DSR, DTR. RI. and DCD).
o  Fully programmable serial-interface characteristics:
   - 5, 6, 7. or 8-bit characters
   - Even, odd. or no-parity bit generation and detection
   - 1, 1.5 or 2-stop bit generation
o  False start bit detection.
o  TRl-STATE TTL drive capabilities for bidirectional data bus and 
   control bus on each channel
o  Internal diagnostic capabilities:
   - Loopback controls for communications link fault isolation
   - Break, parity, overrun, framing error simulation.
o  Fully prioritized interrupt system controls.

**W86C456   I/O controller [no datasheet]                            ?
**W860551/P UART with FIFO and Printer Port Controller             <94...
**
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