Douglas Quebbeman wrote: You also left out 28.x or was it 27.x), 34.5, and 2 different rates in the 50's. Sorry I went through my asm code and couldn't find the references to the speeds. The 6551 started at 50 and went up but I think we got the oddball rates using external clocking. The newspaper industry used these rates. A 1918 motorized Underwood typewritter would use dry loop and the 28.x/27.x rate. It was still supported in the mid 80's when it was retired when no new parts were available. BTW all of these rate (less than & equal to 300) used Bell 103 when communicating via a modem. Reminds me of the time we played with a printing machine designed in the 1940's. Used a centronics like parallel interface but +/- 25 volts, weird timing for the pulses and smelled of vinegar! -- Linux Home Automation Neil Cherry ncherry(a)home.net http://members.home.net/ncherry (Text only) http://meltingpot.fortunecity.com/lightsey/52 (Graphics) http://linuxha.sourceforge.net/ (SourceForge)