NAOMI Dimm Board Jumpers

OldFoo · Post by **OldFoo** » Thu Jun 15, 2006 1:33 pm

Is anyone aware of what the jumpers on the DIMM board do?

There are four of them on mine, 3 of them are in a pack to the left, and one is on the right.

I noticed that my GDRom doesn't ever spin down (even after the game is loaded) so I was wondering if maybe one of these jumpers were misassigned.

OldFoo · Post by **OldFoo** » Thu Jun 15, 2006 1:50 pm

I've wondered the same thing, but have not found any information about them. :smt009

OldFoo · Post by **OldFoo** » Thu Jun 15, 2006 2:14 pm

jumpers are for the memory configuration as far as I know.

Is it normal for a GD-ROM to keep spinning after game loaded? I never checked!

OldFoo · Post by **OldFoo** » Thu Jun 15, 2006 2:15 pm

I've taken some photos of the relevant parts, you can see them at:

http://neovanglist.net/~Neovanglist/NAOMI/DIMM/

Sorry for the crappy quality, all I had on hand was my cell phone camera.

Notice that there are also two IC sockets on the daughterboard, also note the small DIP just left of the large Flex 10k FPGA.

I'd need to pull back the sticker and take the part number, but I have a hunch that is a small 8 bit serial EEPROM, probably holding the execution logic for the FPGA.

Also notice that it seems the MainBoard itself has a full socket for another ROM cart... that really doesn't make any sense.

I'm looking at this and wondering if it would be possible to roll our own system for upgrading the DIMM boards to newer firmware, without having the strange illusive DIMM board upgrade disc and a matching IC.

I do embedded/console programming for a living so this kind of stuff is interesting to me, don't know about the rest of you though

Maybe someone else knows something in relation to this stuff too?

OldFoo · Post by **OldFoo** » Thu Jun 15, 2006 2:28 pm

I think after a while its stops spinning & makes they horrible power down sound like with all optical drives.

OldFoo · Post by **OldFoo** » Thu Jun 15, 2006 2:43 pm

yep it stops spinning after the game is loaded.

OldFoo · Post by **OldFoo** » Thu Jun 15, 2006 2:55 pm

RGP wrote:I think after a while its stops spinning & makes they horrible power down sound like with all optical drives.

Yeah. It makes the same power down sound as the Dreamcast. As far as I know, I think the reader module is the same.

OldFoo · Post by **OldFoo** » Thu Jun 15, 2006 7:48 pm

the gd unit s are the same as the dreamcast,i just put a brand new in my second gd drive/naomi