Al, thanks for the reply. The LCDs are dumb; I'm using a PCF8574 port expander to control the segments. I did look again at that datasheet and all seems well in that the I2C seems to be a very standard implimentation.

At this pint I'm exploring Art's assertion that its in the I2CWrite syntax - I think he's right; I just don't understand the "control byte" thing well enough to fix it. Lining up the commas...

I2CWRITE SDA, SCL, $70, ,OUTP <- my code
I2CWRITE SDA, SDL, I2CDEVICESELECT, ADDRESSONDEVICE, DATA <- Art's

Shows I've missed something. Art calls it the ADDRESSONDEVICE, but since I have no clue what the control byte would be on the chip I'm using (I read and understand the examples given for memory chips), I'm pretty sure thats where the problem lies.

Off, armed with a hint, in search of an answer.