Korg DDD-1 sampling board

[Circuitbenders]

Does anyone have any information about the sampling board for the Korg DDD-1 drum machine. Has anyone ever even seen one?

I've bent a few DDD-1's but i've never seen one with a sampling board installed. Whenever you see them on ebay they are usually listed as 'sampling drum machine' or something but if you ask the seller to look to see if it actually has the sampling board then it never has it.

I'm beginning to think that its all a cunning fabrication.

[wndrdub]

HI,
I have a DDD-1 that I think has the sampling board installed. I haven't used it, but certainly looks like an optional board!
Happy to send a pic along.

[Circuitbenders]

I think the sampling board slots in under that cover than unscrews from the back, at least theres some kind of rails in there with an edge connector on the main board inside. Also if you try to select the sampling option on one without the board in it nothing will happen, you just can't select that option.

[Cumulus]

I have had a Korg DDD-1 for almost 20 years now and I had never seen one with the sampling board until recently.  I found one with the sampling board on Craigslist and it is a lot of fun.

Sure, the sampling is not as sophisticated as what's out there now but it was nice to finally find one!

If anyone wants some pics of the board let me know and I will see if I can get some.

[Circuitbenders]

A sampling board went on ebay a week or so ago for more than you'd pay for a DDD-1!

Am i right in thinking it slots into those rails through that cover on the back?

[Cumulus]

Yes, I believe that is where it goes.  I haven't opened up the "new" one yet.  I did test the sampling feature with (of all things) my Casio SK-1 and it is a lot of fun.

I would like to see someone reverse-engineer a sampling board for the thing.  Maybe it could incorporate more samples or longer sample times.

[LoneStar81]

I would like to see someone reverse-engineer a sampling board for the thing.  Maybe it could incorporate more samples or longer sample times.

Shouldn't be too hard. Thanks to the JEDEC pinout standard you can mostly put in a double size ram/rom chip with only one or two lines/traces on the board to modify.

[Circuitbenders]

On a DDD-1 without the sampling board installed you can't even select the sampling option on the menu grid, the buttons won't work.

Would this be because it needs to detect memory or it won't work? Or maybe its as simple as installing teh board closes a switch.

 It seems unlikely that the sampling apart of the OS would be on the extra board.

[Gordonjcp]

If someone with a sampling board could post good, high-res pics of both sides of the board, I might be able to figure a few things out.

[Kneebone77]

Hey Y'all, new 2 the forum here but I come bearing gifts....

http://kittenpurse.blogspot.com/2008/10/new-toy-korg-ddd-1-sampling-board.html

It has a pic of the sample board with a pretty Hi-Res pic up too.
Hope this helps you in your fabrication/modding!

[Gordonjcp]

So on the sampling board, we have:

A mask-programmed CPU (65010)
64k x 8bit memory
A PIO (8255)
A 2069AD VCF/VCA similar to the ones in the Poly-800
A compander (uPC1571)
A VCA (13700)
Some glue logic and some opamps, presumably for preamps etc
A comparator (311D)

Nothing jumps out at me as being a DAC or ADC.  It might be that the DAC is implemented by one of those resistor packs, like in the Roland drum machines, and the ADC uses the DAC and comparator.