> The problem is that it does 9 bit serial, and it is almost impossible to
> find anything which does 9 bit serial protocol analysis, and does it in
> real time (as opposed to a typical pc logic analyzer which captures then
> analyzes), and is relatively inexpensive.
>=20
> Is anyone aware of a uart-like interface/analyzer which will monitor 9
> bit serial data - relatively inexpensive, and preferably does ttl-level
> (although I can definitely 'upconvert' to rs-232 levels really easily)?
>=20
> Oh, standard baud rates, up to at least 115.2, although higher would be
> nice...

I would be tempted to get a CMOS 40 pin UART chip of the old standard pin o=
ut (AY1640 ??), set it up for 8 bit with parity, and use the parity flag as=
 the 9th bit. Feed that into a 16 bit parallel port on a PIC24 or similar c=
hip (you may even be able to do a similar thing with the internal UART on t=
he PIC, but I think that locks out the UART with an error when you have a p=
arity bit error and then the UART needs resetting) and handle the info disp=
lay from there on an LCD. You will need to do a little bit of computation t=
o convert the parity bit flag into true bit state.

If this is to be a one off tool I would look at purchasing a PIC24 Graphics=
 demo board, and suitably boxing it up.
--=20
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--=20
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