Oki OKIFAX 5750 Service Manual page 848

Service Guide OKIFAX 5750/5950 Page: 283
Chapter A Board Descriptions
A3.1.11 Centronics Parallel Interface
The LSI sets a BUSY-P signal to ON at the same time when it reads the parallel data (PDATA1-P to PDATA8-P) from the parallel port at the fall of STB-N signal.
Furthermore, it makes the store processing of receiving data into a receive buffer terminate within a certain fixed time and outputs an ACK-N signal, setting the
BUSY-P signal to OFF.