Adding extra ram in A2000 with a2630

[SpeedGeek]

One thing to keep in mind--when doing this, adding RAM especially via the A2632, you will have horrible SCSI performance and problems.  Best thing to do is get a proper accelerator with SCSI built in.  This way you will have good SCSI speed.  With a SCSI controller you have the 16-bit to 32-bit DMA problem, and it really sucks let me tell you!  (~200kb/s)

Apparently, you never tried vbak2091 (Aminet) or Ralph Babel's Guru ROM.
Hint: Buffered DMA is much faster than PIO on the A2091!

[SpeedGeek]

I did try these and other DMA hack tools for this issue and they did not work for me.  I spent weeks trying and I just gave up.  I recently tried again (WITHOUT the 2091) and it works great!  (using IDE)  LOL

http://www.amiga.org/forums/showthread.php?t=20008

Either you did not install or configure the DMA hacks correctly (i.e. scsi.device, unit no., buffer size) or you maybe tried them on Kickstart 1.3 which most don't support.

Setting the mask is just a filesystem kludge to force PIO mode for "Brain Dead" SCSI drivers.