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B-12 Sun Ultra 60 Service Manual • August 2001
FIGURE B-6 Parallel Port Connector Pin Configuration
TABLE B-6 Parallel Port Connector Pin Assignments
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 Thru Data7 The main data bus for the parallel
port. Data0 is the least significant
bit (LSB). 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.
11 BUSY Busy Driven high to indicate the
peripheral device is not ready to
receive data during forward
channel transfer. Used to send
Data3 and Data7 during reverse
channel transfer.
12 PERROR Parity Error Driven high by peripheral device
to indicate an error in the paper
path during forward channel
transfer. Used to send Data2 and
Data6 during reverse channel
transfer.
13 SELECT_L Select Low Indicates the peripheral device is
on-line during forward channel
transfer. Used to send Data1 and
Data5 during reverse channel
transfer.
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