Back when I actually had a tube a TMS5200(kick myself for not buying all I could when I could) every NOS chip with the same lot/date codes sounded different when tested on the same board. Most where slight differences but some where darth vader, much slower/lower pitch and others where more towards the alvin in the chipmunks faster / higher pitch. Maybe the leg rot that happens on these chips gets up inside of the chip package and effects something or just they just always sounded different from day of production... not sure

A TMS5220 almost works dropped in but most phrases are garbled. Its like it is pin compatible but the instructions are different. Having the speech ROMs modified to use the TMS5220 would be awesome as you can still get that chip relatively easily. I don't even know if that is possible to do tho. Not having a TMS5200 because the original's legs rotted away is a reason many of these boards are dead. I have a box of them without speech chips.

Atari used I think both the TMS5220 and TMS5200 in the video game Gauntlet. They probably had the right development tools tho that might be just lost to time.

The speech clock resistor you can change to trim pot used like a rheostat and get some adjustment to pitch, but you can't make a darth vader tms5200 sound like an alvin chipmunk tms5200. Its hard to describe, but adjusting is worth trying.

TMC0285 appears to be the same thing as TMS5200NL/CD2501E too but is also not available anywhere.

The Apple Echo II supposedly used a TMS5200 in the early versions of it, but all the pictures that come up in google image show a TMS5220.

Nice stash of chips. Hopefully having them in a vacuum sealed bag will slow down the leg rot that happens. Maybe throw some desiccant and oxygen absorbing packets in with it.

*edit* from wikipedia
TMS5200 (AKA CD2501E, internal TI name is '0285' hence chip is sometimes labeled TMC0285): Added 8-bit parallel FIFO interface; designed for use by the TI consumer division for the TI 99/4A speech module; also used on the 4th generation Bally/Midway pinball tables' Squawk and Talk speech board (part number AS-2518-61), on the Environmental cabinet version of the Bally/Midway arcade game Discs of TRON, on (earlier) Apple II Echo 2 cards, and on the Zaccaria arcade games Jack Rabbit and Money Money, and Zaccaria pinball machines Pinball Champ and Soccer Kings. Superseded by TMS5220 in late 1980/1981, and possibly sold as cheap, 'fire-sale' stock in 1982–1983. Uses the 'final' chirp table.