Jumper and Switch Information  
6-3
Mass Storage
The Compaq Professional Workstation AP550 supports Ultra3 SCSI, Wide Ultra2 SCSI, and
Ultra ATA hard drives. The specifications included below are the standard hard drive
configurations shipped with the workstation. For specifications on other hard drives, refer to the
Service 
Quick Reference Guide
.
9.1-GB Ultra3 SCSI Hard Drive
Printed
Circuit
Board
Pin 1
J2
SCSI ID
0
1
2
3
4
5
6
Bit 0Bit 1Bit 2
Jumper NOT Installed
Jumper Installed
SCSI ID Settings
Key
9.1 GB
Drive Size:
DDRS-39130
Model:
J2
Default Settings
Jumper NOT Installed 
Jumper Installed
Key
Signal
S
P
W
X
Description
Start Unit Command Enabled
Parity Enabled
Write Protect Disabled
Synch Data Transfer Enabled
Jumper
n/a
Pin 1
J2
Bit 2
Bit 0
Bit 3
Bit 1
S
P
SCSI
POWER
Pin 1
J1B
1. All jumper and switch settings are shown in the 
    factory default setting, including those not labeled.
2. Termination is disabled/removed.
NOTES:
     This  drive is intended for non-pluggable
     applications only.  Migration to a 
     Hot-Pluggable Drive Tray is not supported.
NOTE:
n/a
Figure 6-2.  Locating the jumper positions for the 9.1-GB hard drive (DDRS-39130)