Check this out, the datasheet for SP0256B has an important clue. Look on page 2 under test modes. One of the test modes tell the SP0256 to ignore its on-board ROM and use the external serial speech ROM via SPR000. All I need now is a datasheet for the SPR000 and/or SFD2000 and I can build a board to emulate a SP0256 using an external ROM.
I might also possibly have a line on an ancient SFD2000. Maybe the owner will sell it to me for some reverse engineering. Possibly but I wouldn't bet big money on it.
Also, with some analysis, actually replace the SPR000 with something different (eventually). Pretty cool eh?
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