Parallel Interface Connector - HP Compaq dc7900 USDT Technical Reference Manual

Input/Output Interfaces

5.5.4 Parallel Interface Connector

Figure 5-5 and Table 5-5 show the connector and pinout of the parallel connector provided on the
optional parallel bracket/cable assembly. Note that some signals are redefined depending on the
port's operational mode.
Figure 5-5. DB-25 Parallel Interface Connector (as viewed from rear of chassis)
Pin Signal
1 STB-
2 D0
3 D1
4 D2
5 D3
6 D4
7 D5
8 D6
9 D7
10 ACK-
1 1 BSY
12 PE
13 SLCT
NOTES:
[1] Standard and ECP mode function / EPP mode function
[2] EPP mode function: Data Strobe
ECP modes: Auto Feed or Host Acknowledge
[3] EPP mode: user defined
ECP modes:Fault or Peripheral Req.
[4] EPP mode: Reset
ECP modes: Initialize or Reverse Req.
5-8
DB-25 Parallel Connector Pinout
Function
Strobe / Write [1]
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Acknowledge / Interrupt [1]
Busy / Wait [1]
Paper End / User defined [1]
Select / User defined [1]
Table 5-5.
Pin Signal Function
14 LF- Line Feed [2]
15 ERR- Error [3]
16 INIT- Initialize Paper [4]
17 SLCTIN- Select In / Address. Strobe [1]
18 GND Ground
19 GND Ground
20 GND Ground
21 GND Ground
22 GND Ground
23 GND Ground
24 GND Ground
25 GND Ground
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