Oops, sorry. It is a stock Macintosh IIci with 128MBs of RAM.

It pauses with or without extensions on.

I'm running version 1.8 of Hard Disk Tool Kit and version 3.4 of JackHammer SCSI software.

There are no devices attached to the card.

What I meant by hardware conflict is any other cards other than the Jackhammer. I removed all my 3rd party cards and upgrades and only had the Jackhammer card installed.