At 07:18 PM 1/29/99 +0100, you wrote: >com 1 & 3 (2 & 4) use the same interrupt - 4 (3) - that is the big >problem!!!! >You can't (can - but you must know, how...) use com ports on the same >interrupt in the same time... :-)))) Use a driver which is smart enough to control both devices. It's a software issue. Andy \-----------------/ \ /---\ / \ | | / Andy Kunz \ /---\ / Montana Design /---------+ +---------\ http://www.montanadesign.com | / |----|___|----| \ | \/___| * |___\/ Go fast, turn right, and keep the wet side down!