Well you need to find out if you have a socketted buster chip. If so then it is easier to upgrade than the Kickstart chips! If not, then it is one of the most difficult upgrades you can do to the A4000...
The only problem is trying to use Zorro III cards in a buster 9 system. Especially more than one card. Like the SCSI II cards that use DMA. The Fastlane Z3 had a built in fix for the buster 9 systems.
