HP Model 712/100 - Workstation Technical Reference Manual page 56

Connector Pinouts
Pin No.
02
04
06
08
10
12
14
16
18
20
22
24
26 Termpwr
28
30
32
34
36
38
40
42
44
46
48
50
Note: All odd pins shall be signal returns and shall be connected to signal GND at the drive, except
pin 25 which is left free to protect against mis–insertion.
Signal To
DB[0] B Data Bus (LSB)
DB[1] B Data Bus
DB[2] B Data Bus
DB[3] B Data Bus
DB[4] B Data Bus
DB[5] B Data Bus
DB[6] B Data Bus
DB[7] B Data Bus (MSB)
DB[P] B Data Bus Parity
B Terminator Power
Reserved
Not Used (GND)
ATN D Indicates message available for drive
Not Used (GND)
BSY B Signal indicating bus is in use
ACK D Data/Command transfer handshake
RST D Or–tied signal indicating reset condition
MSG H Indicates message phase
SEL B Signal indicating selection/reselction phase
C/D H Indicates whether control or data info. is on data bus
REQ H DataCommand transfer handshake
I/O H Indicates direction of information transfer. Assertion
indicates transfer to host.
H = Host D = Drive
Description
B = Bidirectional