Josh Collins wrote: > And what is the PCF8574 chip I keep hearing about? How does it work? > > "If I could be one thing in the world, I would be a tear born in your > eye, living on your cheek, and dying on your lips" - Josh Collins This is a chip that connects to the calc as a I2C device (see my previous letter) and allows it to speak parallel language and might give it more IO lines. (Input/Output) -=<Matt>=-