Adding extra ram in A2000 with a2630

[TjLaZer]

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)

[TjLaZer]

@Tjlazer

I would agree using the A2632 rules out using the A2091 controller for the most part (unless you use some third party software hacks), but using a GVP HD+8 controller seems to work fine for me anyway.  The GVP uses it's own special 24-bit dma software scheme so it differs from the A2091 performance wise.

You could always also use a non-dma scsi card like the Trumpcard, ICD or Dataflyer.  The Trumpcard is the fastest afaik non-dma scsi controller out there.

Necrobump.

I just was playing with my A2000 the last few days!  It has a A2630 with 2MB on it and I was playing with my 2632 card and installed 32MB on it.  Could not get any spare SCSI HDs working (all dead) so I threw in my DataFlyer Plus IDE.  Works great!  2.5MB/s transfer speeds.  Using an old 2GB IDE HD and it works awesome!  

I knew that back in 2008 had major issues with my A2091 HD. Did not play well with the 32-bit RAM.

[TjLaZer]

Yep tried that and it didn't help much.  It was way under 1Mb/s.  had to have 2MB fast RAM or it would crawl.

[TjLaZer]

Hello this is the first time here. But i also have an Amiga 2000 with a2630 cpu and 9 mb ram in total. have i understood it right, that i can not add more ram to it as it is now, without an upgrade?

Yes that is correct. They only way to add memory is with a DKB 2632 RAM card.  I have one.  It attaches on the A2630 card and has four 72 pin SIMM slots for up to 112MB RAM (32MB, 32MB, 32MB, 16MB)

The only other way is for you to get a whole different CPU card that has SIMM slots on it.  Some have 72 PIN SIMMs as well for up to 128MB max RAM.

[TjLaZer]

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

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