The onboard SCSI is not DMA and on my 4000T it refuses to work with HDD's...
Hoooo, of course the onboard SCSI has DMA, it is nothing more then an onboard A4091, even a little bit better as it does not have to go through the buster. It`s right that the controller is a little less tolerant when the termination and totalcablelenghts are not 100% right (same goes for the A4091).
The A4000T is a nice look haveing it on or beside your desk, but it is a {bleep} to mount anything in it. First you remove the hood to the side, as it is designed like a desktop that stand upright. so even opening the case requires you to disconnect every external cord and pull it to a free space wher you put it on the side.
Next is the drivebridge that goes across the mainboard. You have to remove this bridge in order to mount the CPU-card.
There are not much drivebays, it just 4 5.25", as the floppy occupies one 5.25" in an adapterbracket. Internal you can only fit one HD on the drivebridge (two if you have the correct spacerplates).
I fixed two HDs on top of the PSU using some tape, as there is so little place.
Another down is that you only have 5 Zorroslots, als most towersolutions for the A4000D have more (although you can only use the first 5 for ZIII cards according to commodorespecification you will hardly find 5 ZIII cards you can stick in a machine at one time)
Now to the pros:
- No fiddling with putting an A4000D and zorroextender in a tower.
- no contactproblems with zorrodautherboards as all Zorroslots are onboard
- You can configure the onboard SCSI via DIP-swithes on the back of the machine without opening it
- No contactproblems with Chip-RAM as it is soldered to the board (could be a donwnside too, as a dead Chip-RAM would mean a dead board)
- If the PSU dies just grab a cheap AT-PSU from the trashheap (A4000T Board has standard P8/P9 connectors, so no custom PSU)
- Looks more original then a butchered together A4000D in a tower.
- will theoretically live longers as they are the last boards produced (as long as you dont get one of the about 300 rare A4000T made by Commodore.)
