WTB: DMAC 04 for Amiga 3000

[matthey]

Be careful. Some accelerators have problems with the Ramsey 7 DMAC 4 combo. The motherboard SCSI becomes flakey (read checksum errors) at least with newer ROMs (3.1 in my case). No accelerator is fine with the combo though. The SCSI was about 1Mb/sec faster with the newer combo. I went back to old chip versions in my 3000T because of the problem. I kept the Buster 11. It's a great upgrade for a 3000. My 3000T is very reliable with out the combo. I would hate for you to spend $100 and be disappointed. There is probably more bang for the buck elsewhere IMHO.

[matthey]

I have the newer SCSI chip in the 3000T also. I still got the errors. I think the 3640 may work ok with the DMAC 4 & Ramsey 7. A CSMK3 didn't and a PP&S Mercury I heard exhibited similar symptoms. They both have memory on board. I thought it was the motherboard SCSI using the accelerator memory buffers and tried changing the RDB MASK to only use motherboard memory but I didn't have any success. I could have disabled the motherboard SCSI but then the only improvement I saw was SCSI speed. It may speed up ram as well but the accelerators memory is faster and used first if it has it. If anyone has more info on my problem, I would like to hear about it. Good luck finding a rare DMAC 4, Dragster.