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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Fixer on September 04, 2007, 04:43:49 PM

Title: DMAC Chip Revisions (A3000 experts will come into their own here)
Post by: Fixer on September 04, 2007, 04:43:49 PM

Hello,

I was thinking of building an A3000 with one of those A3640 CPU cards as a way of cheaply accelerating the Amiga 3000.

To do this I thought it best upgrading the Ramsey and DMAC chips to 07 and 04 respectively.

Ramsey isn't too much of a bother because I'm sure I'll find one of these somewhere, but I know how rare the later DMACs are and that's why I picked one up on eBay some time ago thinking it is a later revision.

However, now looking at this chip I'm not too sure. Looking on Amiga hardware there seems to be only these listed:

Chip Name ---------- Part Number -- Used In
DMAC ----------------- 390563-01 ----- A590, A2091
DMAC ----------------- 390563-02 ----- A3000
DMAC ----------------- 390563-04 ----- A3000T, A4000T
Super DMAC 81 --- 390537-02 ----- A3000

Mine, however, is none of those listed. Here is what is labeled on my DMAC chip:

C= CSG
390537-04
65-SUPER DMAC
CBM 1989, 90, 91
5192 50009D

As you can see it seems to be a Super DMAC rather than an upgraded DMAC chip.

So at this point I'm rather confused. Does anyone know what this revision is/is for and if I can use it for the upgrade?

Thanks.

Title: Re: DMAC Chip Revisions (A3000 experts will come into their own here)
Post by: downix on September 04, 2007, 05:01:31 PM

It should work.  It's a rare beasty, only found 3 references for it anywhere, all of which seem to refer to the A3000+ or last-gen A3000's (stupid babelfish translation), and is listed as one of the fastest DMAC made.

Title: Re: DMAC Chip Revisions (A3000 experts will come into their own here)
Post by: wildstar1063 on September 04, 2007, 07:53:56 PM

I have the following in a stat bag, I bought to upgrade
 my first 3000D, but it died, so I still have the chips in
 the bag:

(http://i109.photobucket.com/albums/n62/wildstar1063/SUPER_DMAC_04.jpg)




(http://i109.photobucket.com/albums/n62/wildstar1063/Super_Buster_11.jpg)




(http://i109.photobucket.com/albums/n62/wildstar1063/RAMSEY_07.jpg)



I have a 3000D that I bought a while back, I'm thinking
about putting them in it.

I seem to remember that there was an upgraded SCSI chip
I bought as well, but it's not in the static bag with the
rest.

I knew that Play USB Microscope I bought a the thrift store
 for $5.00 would come in handy for some kind of Pics.

WILDSTAR1063

Title: Re: DMAC Chip Revisions (A3000 experts will come into their own here)
Post by: Fixer on September 04, 2007, 09:24:39 PM

Quote

downix wrote:
It should work.  It's a rare beasty, only found 3 references for it anywhere, all of which seem to refer to the A3000+ or last-gen A3000's (stupid babelfish translation), and is listed as one of the fastest DMAC made.

Thanks dude, and that's good to know about it being rare.. well unless it requires an equally rare Ramsey to go along with it. Lol.

@wildstar1063

Yeh that's my chip in your top picture. It's exactly the same!

I haven't actually got a A3000D yet but I've got a lot of the parts ready like Super Buster 11, that DMAC chip and Zorro cards.

Accelerators cost a bomb so I thought the A3640/Amiga 3000 combination is almost as good as an all-in-one accelerator solution. :-)