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  1. YamahaDX
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DX7II,S series ROM cartridge

 

Dear Friends

I'd like to ask, has anyone managed to track down the schematics of these rom cards?
I found some internal pictures for them, and i'd try to track, but if anyone else has done it ... :)

Thank You in advance!
 

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I have schematics only for RAM4.

Daniel Forró

On Mar 26, 2021, at 19:33, csabi@... wrote:

Dear Friends

I'd like to ask, has anyone managed to track down the schematics of these rom cards?
I found some internal pictures for them, and i'd try to track, but if anyone else has done it ... :)

Thank You in advance!
 

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Also for RAM1…

Daniel Forró



On Mar 26, 2021, at 19:33, csabi@... wrote:

Dear Friends

I'd like to ask, has anyone managed to track down the schematics of these rom cards?
I found some internal pictures for them, and i'd try to track, but if anyone else has done it ... :)

Thank You in advance!
 

Thank You Daniel!

No problem, i will try to track based on internal images.
I will post here, if something succeeds.

Thanks!
 

I've added internal pictures of my Supra-RAM 256 DX7II cartridge (4 banks, selectable from the System menu).

- Andy
 

... I meant to say, I've added the pictures to the Photos section.? The album is here:

/g/YamahaDX/album?id=262257

- Andy
 

The schematics might be in one of the synth service manuals. I know they did that with the early cartridges.
 

Thank You Andy!
Fortunately, the ROM cards are more simple than this RAM card.

Some NAND gates and the (EP)ROM chip itself with resistors on data and address lines.

Thank You!!

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