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386er



Joined: 27 Jan 2007
Posts: 274
Location: USA

PostPosted: Sat Feb 24, 2007 10:43 pm Reply with quoteBack to top

I'm almost done rebuilding my messed up 386 and the last problem is com3 doesn't work. the mb and the modem work ok and i dont think theres a conflict but I could be wrong.

onboard serial=com1 irq4
modem=com2 irq3
i/o card =com3 irq4

the i/o card is giving me problems.
msd cant find it and i dont know what else i could do to test it.
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ryan



Joined: 19 Apr 2006
Posts: 261
Location: WisConSin

PostPosted: Mon Feb 26, 2007 9:35 pm Reply with quoteBack to top

Why are you trying to use more than 2 COM ports?

Generally there is no point in having a COM Port 1 & 3 on the same machine. Needless to say COM 1 & 3 and COM 2 & 4 generally share the same IRQ and many times won't work at all at the same time, AKA COM 1 & 3 won't play nicely if used at the same time, same for 2 & 4.

If you are very lucky the best you can do is have COM 1 work, then stop it and send data from COM 3 and stop but never at the same time without special multi/io cards. This can almost be workable if one COM port is on a modem and the other shared port is for something intermittant like a data cable to a PDA or camera. But if both ports are to be in use it usually doesn't work.

Now why your com 3 doesn't show up at all is a mystery, unless you have a serial mouse on com 1 and are running the diagnostic then.

You could try disabling COM 1 to see if com 3 works, if it does your machine has the classic problem of not wanting com ports on the same IRQ which is a hard one to fix.

Good Luck
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386er



Joined: 27 Jan 2007
Posts: 274
Location: USA

PostPosted: Mon Feb 26, 2007 11:03 pm Reply with quoteBack to top

My problem is all fixed now. i can hook a serial mouse up to com3 and the driver can find it. I use com1 for a mouse com2 for a modem and com3 is used for interlnk and intersvr. Thank you for your advice and I usually dont use com 1 and 3 at the same time anyway.
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wdegroot



Joined: 03 Feb 2006
Posts: 488
Location: pennsylvanai

PostPosted: Tue Feb 27, 2007 1:26 am Reply with quoteBack to top

as said com 1 & 3 irq4 and 2 & 4 irq3
however i/o cards come in 3 "flavors"
1) no way to turn ports off or on
2) jumpers to do so bit that don't really work
3)i/o cards with jumpers that really work

in a pinch , of there is no sound card i think
irq5 com 2 can ne used. but sound cared are almost always on irq5.

withj newer pc's the com ports are often unused and they can be turned off in the cmos setup.
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bear



Joined: 04 Oct 2004
Posts: 172
Location: 57�59'N 15�39'E

PostPosted: Wed Feb 28, 2007 9:51 pm Reply with quoteBack to top

Yeah it is different now, I allways disable com and lpt any USB ISA cards for XT Wink
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386er



Joined: 27 Jan 2007
Posts: 274
Location: USA

PostPosted: Thu Mar 01, 2007 2:47 am Reply with quoteBack to top

ISA USB Confused There ISA USB cards!
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bear



Joined: 04 Oct 2004
Posts: 172
Location: 57�59'N 15�39'E

PostPosted: Thu Mar 01, 2007 9:56 pm Reply with quoteBack to top

Smile no but there are USB to a virtual ISA though

http://www.arstech.com/item--usb2isa.html
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