HP Compaq dc7900 USDT

5-8 www.hp.com Technical Reference Guide
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)
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.
Table 5-5.
DB-25 Parallel Connector Pinout
Pin Signal Function Pin Signal Function
1 STB- Strobe / Write [1] 14 LF- Line Feed [2]
2D0 Data 0 15ERR- Error [3]
3 D1 Data 1 16 INIT- Initialize Paper [4]
4 D2 Data 2 17 SLCTIN- Select In / Address. Strobe [1]
5D3 Data 3 18GNDGround
6D4 Data 4 19GNDGround
7D5 Data 5 20GNDGround
8D6 Data 6 21GNDGround
9D7 Data 7 22GNDGround
10 ACK- Acknowledge / Interrupt [1] 23 GND Ground
11 B S Y B u s y / W a i t [ 1 ] 2 4 G N D G r o u n d
12 PE Paper End / User defined [1] 25 GND Ground
13 S LC T S e l e c t / U se r d e fi n e d [ 1 ] - - - - - -