Fighting a sound board issue in a Theatre of Magic and need some help.
Purchased the machine as a project, however sound DID work when first powered on.

After some repairs were made (new ribbon cables etc) sound no longer works.
- Confirmed ribbon cables by swapping with an Addams Family.
- Initially got "Soundboard interface error" and single Bong sound.
- Heavily corroded ROM sockets, reseated ROM's and then got the 2 Bong error (U2 ROM error)
- Removed the ROM sockets (no lifted traces, all new ROM sockets installed)
- Now no bongs but "Sound board interface error" still displayed.
- Removed all ROM's and "RAM Error U10-U12" is displayed, no bongs.

I am assuming the RAM at U10-U11-U12 is bad.
I read a post about adding 8bit RAM rather than the original 2bit obsolete/expensive chips.
How do I do this?

Post on Google Groups follows:
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Frank-Rainer Grahl 6/11/10

Better re-jumper the board for 8K rams. You need to change all 3 anyway. The 2K
rams are almost impossible to find at a good price. Just use a 7C185 or
equivalent. If the DSP is bad the board usually does nothing. Changed a few of
them and still hate SMT parts
================================================

Just not a lot of info out there on the DCS past the ROM error's and Bong sounds.
I will default to sending this off if I have to, but I purchased a Hakko FR300 to safely desolder and fix it myself.
(The days of the Radio Shack bulb de-solder iron are at an end)

Any help, advice, or moral support would be appreciated.
I really want to fix this!!

Found the RAM jumper answer from PinWiki

4.18.3.2 Ram Error

If you get a ram error you usually have a hard time to get replacement rams for the DCS sound board.
The board uses 3 2K 24.3 skinny dip 6116 cache rams with an access time of 35nS or better. These are long obsolete and gone. The good news is that the board has jumpers for 6264 type 8K cache rams. Jumper W4 is for 2K rams. It needs to be removed and W5 needs to be set if you want to use 8K rams. You need to exchange all rams for this to work. A cheap still in production replacement is the CY7C185-20PXC.
(Digikey 428-2157-5-ND).

Hopefully I will have the RAM replaced and then see what error comes next.... <sigh>