Commodore A 2091-40 - Page 67

Jumper Pin Settings C-1
Appendix C: Jumper Pin Settings
Jumper 1: Memory Size
2 Megabytes
1 Megabyte
512 Kilobytes
0 Kilobytes
Factory set to 0 Kilobytes.
Jumper 2: Autoboot Enable/Disable
If you are using Kickstart 1.3 or higher, you can set Jumper 2 to the Autoboot
position. This will allow you to boot your system from the A2091. Factory set to
Autoboot Enabled.
Jumper 5, Option 1: LUN Enable
This only affects SCSI drives. If you have more than one device at a physical
address, set this jumper to on. When this jumper is enabled, the system looks for
eight Logical Unit Numbers (LUN), or eight devices, at each physical SCSI address,
and will attempt to open Logical Units 0 through 7 at each physical SCSI address.
When this jumper is disabled, the system will look for one device. Factory set to
off.
NOTE: Some SCSI drives, such as certain Seagate and Epson drives, respond to
more than one logical address. Such drives will appear on the Workbench screen
and the Hard Drive Preparation, Partitioning and Formatting screen in
HDToolbox multiple times, at the same Address but at LUN 0 through 7. If this
occurs, set this jumper to the off position.
Jumper 5, Option 2: Time-out Length
If you are using a SCSI drive that takes longer than thirty seconds to start up when
you turn the system on, such as some Seagate drives, you may wish to set this
jumper to the on position. When this jumper is in the off position the time-out period,
(the time between the start-up and when the system checks the drive), is short.
When this jumper is in the on position the system will wait a longer time before
checking the drive.