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Thanks for the answer. I'm forwarding this to the TP750 mailing list since a couple folks are really mad at IBM that their $3000 machine has a 16450. It makes sense if it's a 486SL limitation. In article <19940721.164333.8@almaden.ibm.com> writes: >In <30mbrq$ij@jaws.cs.hmc.edu> John H. Kim writes: > >>The TP750's built-in serial port emulates a 16450 (you'd think in a >>machine that costs $3000+ they'd pitch in the extra $10 for a 16550). > >Notebook computers generally don't have a separate UART. (No room for >one.) The UART is emulated within one of the support chips. Since >the ThinkPad 750 has an Intel 486SL, it uses the Intel SL chipset, and >that chipset emulates the 16450. Probably all Intel 486SL notebooks >have this restriction since they probably all use the same Intel SL >chipset. > >If it's any consolation, the 755 and 360 use a newer chipset that does >emulate the 16550. > >...Michael Graff -- John H. Kim | (This space to be filled when I think of jokim@jarthur.cs.hmc.edu | something clever to use as a disclaimer)