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Appendix A Connector Signal Descriptions 165
Reference for the Parallel Port Connector
The parallel port connector is a DB-25 type connector located on the main logic
board back panel.
Parallel Port Connector Diagram
Parallel Port Signals
Pin Mnemonic Signal Name Description
1 Data_Strobe_L Data Strobe Low Set low during forward
channel transfers to latch data
into peripheral device. Set
high during reverse channel
transfers.
2 to 9 Data[0..7] Data0 Through
Data7
The main data bus for the
parallel port. Data0 is the least
significant bit (LSB). These bits
are not used during reverse
channel transfers.
10 ACK_L Acknowledge Low Driven low by the peripheral
device to acknowledge data
byte transfer from host during
forward channel transfer.
Qualifies data being
transferred to host in reverse
channel transfer.
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