3-18
Computer Group Literature Center Web Site
Interconnect Signals
3
J5 connector
Connector J5 is the port labeled PRINTER on the MVME712M front
panel. This is a Centronics type parallel port. Each pin connection, signal
mnemonic, and signal characteristic for the printer port connector is listed
in the following table.
Table 3-7. Connector J5 interconnect signals
Pin
Number
Signal
Mnemonic
Signal Name and Description
1
PRSTB*
DATA STROBE - an active low output pulse used to
clock data from the system to the printer.
2
PRD0
DATA (bit 0)
3
PRD1
DATA (bit 1)
4
PRD2
DATA (bit 2)
5
PRD3
DATA (bit 3)
6
PRD4
DATA (bit 4)
7
PRD5
DATA (bit 5)
8
PRD6
DATA (bit 6)
9
PRD7
DATA (bit 7)
10
PRACK*
DATA ACKNOWLEDGE - a low level input pulse
indicating that the next character may be sent.
11
PRBSY
BUSY - an input signal indicating that the printer
cannot receive data.
12
PRPE
PAPER EMPTY - out of paper.
13
PRSEL
SELECTED - an input signal indicating that the printer
is selected.
14,15
Not used.
16
GND
GROUND
17,18
Not used.
19-30
GND
GROUND
31
INPRIME*
INPUT PRIME - an output signal that clears the
printer buffer and initializes the logic.
32
PRFAULT*
FAULT - an input signal that indicates a printer fault
condition.
33-36
Not used.
