I wish I had those old style toms as well, and a better bass drum (could probably swap the existing one with a Linndrum or Linn LM-1 bassdrum) but don't want to put that much money into it right now.
From what I understand you need to use a 1554 voice card for the old style (Blue monday, Rockit etc.) toms. I believe you need to configure it as explained in Oberheim DMX Type 1554 Voice Card Configuration
and furthermore by going to Oberheim Tom 1/Tom 2 Voice Card Configuration
. At least I think that's the toms we're talking about as I know my "new" style toms occupy a pair of 1675c voice cards
. In addition to the voice card (not sure if the existing tom cards can be used with the old style toms as well. That would be great! Perhaps someone else reading knows?) you would need to "burn" (program) EPROM chips with the sounds you want. The old style tom sounds and other sounds can be downloaded for free from here (standard DMX/DX sounds)
. There are also sounds for DMX EPROMs available here (Sequential Drumtraks sounds)
, here (Drumware)
, and here (Digidrum)
. They used to have Linn LM-1, Linndrum and Linn-9000 EPROM files as well but the copyright holders asked to have them removed unfortunately.
Do you have an EPROM programmer? I use a Mac and am out of luck (one of the reasons I haven't replaced any of my DMX sounds yet) but if you use a PC an EPROM programmer can be bought for little money at eBay. If you want to re-use an EPROM by replacing its existing sound (or have made a mistake programming one) you'd also need a UV eraser (Ultraviolet light) made specifically for erasing EPROMs. This and the EPROMs themselves are likely available at eBay as well.
Getting back to the voice cards: there's a lot of reading in the above links and I don't know if I've understood all the details, but it seems that although some sounds can be exchanged with the existing ones as a matter of just changing an EPROM chip, other sounds demand that you modify the actual voice board in question by moving jumpers and replacing diodes and resistors with other values in addition to exchanging the EPROM, so since this isn't something you'd be doing every day you would need several voice card (hence more $$$$).
I guess we need to do some planning, figuring out which sounds we want and which type of cards they fit. Reading about the replacement voice cards (1554e) for US$ 98
they seem to be very versatile for this. Apparently you can use either 2732, 2764 or 27128 EPROM chips, where the latter allows for 4 different sounds selectable with switches! Sounds like a great deal to me if you can use multiple EPROMs, all without having to change jumpers, resistors or other components as well.
Sorry for rambling