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Service Guide OL400
Chapter 2 Principles of Operation
2.2.02 Centronics Parallel Interface
The following operations are carried out during
SELECT
mode once the STB-N signal is received
from the host interface.
The BUSY-P signal is sent to the host interface.
Simultaneously with fetching data to the Q4 IC at the last transition of the STB signal, the
RXIPT-P signal is sent to the CPU to inform it of receipt of data.
The CPU reads data received from the Q4 IC by the RD-N signal, and turns off the BUSY signal
to the host interface.
Upon turning off the BUSY signal, the ACK-N signal is sent to the host interface to acknowledge
reception processing.
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