Hi Mr_e,
thanks again for the response on the RS232 question. It sounds to me that it may be a bit dodgy to use the internal oscillator and the old RS232 methods. Guess I'll have to bite the bullet and learn about the real serial ports on the '88. Its just that I had some old code I can pop into the '88 and no further thought needed. Can the official hardware method be any better for accuracy since it must use the same internal oscillator? (?)

thanks again

Spencer