From: mulvey@blurt.oswego.edu (Allen Mulvey, SUNY, Oswego, NY) Subject: Re: Can't set COM4 Distribution: usa Organization: SUNY College at Oswego, Oswego, NY Lines: 28 In article , k4bnc@cbnewsh.cb.att.com (john.a.siegel) writes: > I have been unable to get COM 4 to work - diagnostic programs such as msd show > nothing installed. I think the software options are OK - is there a known > hardware conflict and/or workaround for this problemand CD ROM > System is a G2K 486DX2/66 tower with ATI video card > Ports are set as follows > On board COMa = COM1 IRQ4 to external device > Internal modem = COM 3 IRQ5 > DFIO port card primary port = COM 2 IRQ3 mouse > On board COM B = COM 4 IRQ 9 <--- DOES NOT WORK > I have run this from a boot disk with only command.com to eliminate softwar > > Any suggestions before I call technical support? > John Siegel > k4bnc@cbnewsh.att.com > jas@hrollie.hr.att.com I had this problem some time ago. Some BIOSes do not automatically install COM3 or COM4 in the port tables. Programs like most modem programs which write directly to the port work fine but anything that uses a BIOS call fails. Find a BBS or FTP site where you can get a copy of PORT FINDER. Put "device=pf.sys" in your config.sys or run pf.com from your autoexec.bat. This little program will locate all existing ports and make sure the BIOS tables are updated. It works great. PF will also let you swap ports and such also if that is of any value to you. Allen Mulvey mulvey@blurt.oswego.edu