Hugh Hood wrote:
For many years, it's been generally accepted that the (2) IIGS built-in serial ports (Zilog 8530 SCC chip) max out at 57,600 baud. When pros like David Empson say so, I believe it. And yet, along comes David Schmidt, with his ADTPro, and he's transferring files at 115,200 baud from the IIGS modem port.
Even more interesting is the trick suggested by Stephen Thomas (and reported here by me ;-), to skip the clock divider on the Super Serial Card to allow the 6551 ACIA to move data at 115,200 bps. The SCC has *always* been known to be capable of considerably higher rates, as, for example, when it is used to support AppleTalk. -michael ******** Note new website URL ******** NadaNet and AppleCrate II for Apple II parallel computing! Home page: http://home.comcast.net/~mjmahon/ "The wastebasket is our most important design tool--and it's seriously underused."