Anyone have a good web page with some good 12C508A or 509A hints?

Haven't used these yet, am starting a project.  Need the low cost <G>
16C622/JW's just aren't the same as these!  Will plan to use internal
oscillator, again for low cost.

Making a network of these with a push button apiece, and probably 1-wire
signalling between them (Push the push button, the appropriate ones
sound off through a Piezo disk (Differential drive), 9V power off the
RJ-11 cabling, I'm thinking, 78L05 at each chip, maybe?)  Should be a
fun little project.  They want some custom sounds, I'll code THOSE on a
16F84 or an XT or something, I think, & then move those to the /JW part.

Mainly looking for any "Gotchas", besides the Spec Sheets.  Any problems
in coding for the 12CE519/JW, then transferring some projects to a
12C508A, for example?  (It's a whole buck cheaper <G>)  Client wants 'em
CHEAP, and ubiquitous.

Due to the EEPRom, may just go with the 12CE519/JW parts, does look like
these're all reasonably similar (But then, I have -just- started to read
the Spec sheets in depth!)

  Mark