Service manual

B-10 Sun Ultra 2 Series Service Manual • July 1996
FIGURE B-6 Parallel Port Connector Pin Configuration
TABLE B-6 Parallel Port Connector Pin Assignments
Pin 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). Pins 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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