8-36 Chapter 8, Jumper Settings and Switch Settings
8.14300-/600-MEGABYTE FIXED DISK DRIVE EXPANSION UNIT
The 300-/600-Megabyte Fixed Disk Drive Expan- sion Unit can be used with 386-based COMPAQ desktop systems with ROM revision G or later.
NOTE: A terminating resistor must be installed on a 300-Megabyte Fixed Disk Drive. Refer to Chapter 7, REMOVAL AND REPLACEMENT PROCEDURES, for detailed steps. If two drives are present in the expansion unit, only one drive should have a terminating resistor.
Whenever more than one drive control- ler is in a system, one controller must be set as primary; the other controller must be set as secondary.
Table 8-22 lists the SW500 settings when installing the expansion unit with the ESDI External Fixed Disk Drive Controller Board (Figure 8-22). See Chapter 7, REMOVAL AND REPLACEMENT PROCEDURES, for detailed steps. See Chapter 9, MASS STORAGE CON- FIGURATIONS, for cabling and configurations.
Table 8-22. ESDI External Fixed
Disk Drive Controller Board
Switch Settings
SW500 Settings | |
1 | 2 | 3 | Function |
OFF | | | Primary fixed disk drive |
| | | address select |
ON | | | Secondary fixed disk |
| | | drive address select |
| OFF | OFF | Interrupt select IRQ15 |
| ON | OFF | Interrupt select IRQ14 |
| OFF | ON | Interrupt select IRQ12 |
| ON | ON | Interrupt select IRQ11 |
| | | Default |
Addendum 108431-001 (11-88) to Manual No. 108033-003
