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      ROM CARD and ROM CHIP DEVELOPMENT

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On this page, you will find photos and info on the development of the Rom chips and the PCB expansion card.

Many years ago KORG   and METRASOUND used to sell ROM cards for the DDD series of drum machines,

but these have been long discontinued and are now very rare.

The KORG DDD1 and DDD5 were some of the best drum machines made in the 1980's

and it seemed a shame that it was no longer easily expandable.

The idea was to add new sounds to the DDD series and expand it's usefulness in modern  music production.

long shot of rom card          picture of ROM chip

ARCHIVE

News Update   23November09

NEW PCB EXPANSION BOARDS READY

Here's some pictures of the new PCB Expansion cards that have been done

rom in ddd1

Rom card fitted in DDD-1

Rom card fitted in DDD-5


News Update   30 October09

Welcome to our new home!!

We've had to change again as the geocites site have now closed, which is a real shame

as a lot of sites have now disappeared, and with it , a lot of knowledge and info too.

Hopefully some have been saved in the archives.

,The first Rom to be released will be the TR909 set,

It will contain Kick ,Snare, closed Hi Hat, open Hi hat, Rim shot and Clap. The PCB is still at the design stage,

the PCB will be of high quality , with gold contacts on the edge connectors, just like the original cards.

sounds have been done and only need a few tweaks before they are ready.

A "prototype " PCB has been designed and made and  has been 

tested, hopefully some factory made PCBs will be done soon.


 

News Update   4 November08

Welcome to our new home!!

,we were fed up with all the ADs and pop ups of the other site,

so have moved the site to here. The PCB is now at the design stage,

hopefully the new PCBs will be available in the new year.

sounds has been done and only needs a few tweaks before its ready.

A "prototype " PCB has been designed and made and  has been 

tested, hopefully some factory made PCBs will be done soon.

Instructions on how to fit a ROM chip using  a piece of veroboard

and wires to fit it will be on the site soon (just need to do some pictures  to go with the text)

 

Rom card in slot3 of DDD1

ddd5 rom card

ROM card in DDD5 slot1 , tests are now being made

with the prototype  ROM card with the DDD5.

So far DDD5  will only read a  "Flash "type EPROM

,but some sounds get corrupted, will need to adapt the 

PCB to get round this. 

PROTOTYPE PCB FEB2008

Picture BELOW shows the hand made prototype  PCB ,designed

to simply slot into the DDD drum machines, eliminating 

any need for opening up the DDD machine.

It works just the same as a "normal" ROM card.

So far it works OK with a  UV erasable EPROM

Here, the TR909 ROM is mounted on the PCB.

photo of prototype PCB

a very roughly made PCB , but it works very well

News Update   19 Sept 07

Sorry that this is taking so long, there's been quite a few delays

over the summer months. Resulting  with not a great deal being done over

 July and August.

The good news is that another chip has been done and has been tested

O.K.!  This chip contains a couple of snares and kicks, 2 hi hats and a clap sample.

This is now added to the TR909 ROM and the "Beatbox "  ROM already done.

So far all the testing has been done using  a Chip socket mounted on some VERO BOARD

which is wired into the main PCB on the DDD1, the Vero board sits in the space

where the battery for the sampling PCB would go.

We chose this method as its the most convenient way of testing and inserting /removing chips

without having to open up the DDD1 all the time.

The picture below shows the TR909 Chip in place on the Prototype "test" board

The idea to make this into a "kit" was abandoned because it was  difficult to fit the  board to the main board inside the DDD1
this was mainly used for testing rom chips , before the PCB was made.

ddd underside with rom chip fitted

After the chips were tested the PCB was next:

" Now we have to concentrate on the PCB, and  that is going to be tricky

and we want to get  right,  also we're not sure how a pcb is going to hold up

to being pushed in and pulled out of the card slots all the time,

(a bit like those old Commodore 64 and VIC20 cartridges in the 80's).

 This will have an effect on the final cost too."

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