Path: utzoo!attcan!uunet!mcsun!unido!tub!fauern!tumuc!lan!rommel From: rommel@lan.informatik.tu-muenchen.dbp.de (Kai-Uwe Rommel) Newsgroups: comp.windows.ms Subject: Re: Serial routines in Windows 3.0 Message-ID: <4492@tuminfo1.lan.informatik.tu-muenchen.dbp.de> Date: 17 Sep 90 16:58:52 GMT References: Sender: news@lan.informatik.tu-muenchen.dbp.de Reply-To: rommel@lan.informatik.tu-muenchen.dbp.de (Kai-Uwe Rommel) Organization: Inst. fuer Informatik, TU Muenchen, W. Germany Lines: 19 In article ingea@IFI.UIO.NO (Inge Arnesen) writes: >The COM: device driver cannot be used from standard mode on a 286, since the >switch from protected to real mode takes several milliseconds, making the PC >loose several characters coming in from the line. You can, if you use a 16550A UART and write your own DOS device driver (as I did). I got wonderful performance under standard mode but still poor performance under enhanced mode (damn virtual machines!). >Why on earth are the Windows serial routines so slow, even in real mode ??? >What can be done about it (don't ask me to write a compatible virtual device driver:-) Nothing else. Kai Uwe Rommel -- /* Kai Uwe Rommel * Munich * rommel@lan.informatik.tu-muenchen.dbp.de */