It shouldn't be a battery issue, that only applies to the SCSI settings on the A3000's built-in SCSI.
It is more likely an issue with the old SCSI card as the built-in SCSI on my A2000's CPU card boots like a greased whippet.
Here's some jumper settings:
JP1: Memory Size
0K: Set for no memory.
512K: Set for 512K of RAM.
1M: Set for 1M of RAM.
2M: Set for 2M of RAM.
JP2: Autoboot Enable
AUTO: Set to enable autobooting from the A2091.
DIS: Set to disable autobooting from the A2091.
JP3: Interrupt Select
INT6: Select interrupt 6.
INT2: Select interrupt 2.
JP5: Options
Option 1: LUN Enable. When jumpered, enables scanning for Logical
Unit Numbers numbers at each physical SCSI address.
Default value: Off.
Option 2: Time-Out Length. When jumpered, enables longer time-out
for slow-starting drives. Default: Off. (Note: When on,
this jumper disables parity during the message in phase.)
Option 3: Reserved. Factory default: Off.
JP201: Factory use only.
Note the JP5 option 2 "Time Out Length". Try changing that.
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