hutton@pacific.UUCP (hutton) (08/08/87)
I have an IBM PC/AT that I currently need to add two more com ports (com3 and
com4). The card I purchased is switchable for that range ports 3 and 4, my
question is, How do I get msdos 3.1 or 3.2 to recognize a com3 or com4
device. I need them to be available (all 4) from general utilities we
have, not just from programs we can recompile. Anyway to get a com3 and com4
available to DOS. I assumed it was possible since the card is for an AT
and it is switchable for these positions.
=========================>>>>>>>>>>>>>>Thomas Hutton
{ucbvax,decvax,seismo}sdcsvax!pacific!hutton
hutton@seismo.ARPA
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############################################################################jons@islenet.UUCP (Jonathan Spangler) (08/13/87)
>I have an IBM PC/AT that I currently need to add two more com ports (com3 and >com4). The card I purchased is switchable for that range ports 3 and 4, my >question is, How do I get msdos 3.1 or 3.2 to recognize a com3 or com4 >=========================>>>>>>>>>>>>>>Thomas Hutton > {ucbvax,decvax,seismo}sdcsvax!pacific!hutton > You need a copy of DOS 3.3, which, among other things, supports four serial ports. Aloha, -- Jonathan Spangler {ihnp4,vortex,dual}!islenet!jons OR jons@islenet.hawaii.edu
psfales@ihlpe.ATT.COM (Pete Fales) (08/15/87)
In article <3419@islenet.UUCP>, jons@islenet.UUCP (Jonathan Spangler) writes: > >I have an IBM PC/AT that I currently need to add two more com ports (com3 > >and com4). The card I purchased is switchable for that range ports 3 and > >4, my question is, How do I get msdos 3.1 or 3.2 to recognize a com3 or com4 > >=========================>>>>>>>>>>>>>>Thomas Hutton > > {ucbvax,decvax,seismo}sdcsvax!pacific!hutton > > > > You need a copy of DOS 3.3, which, among other things, supports four serial > ports. It is also possible to use an installable driver with earlier versions of DOS. I was using one for a while that supported COM3 only, but there should be no problem writing one for any number of COM ports. There are two problems with this method: 1) There is not a whole lot of standardization on what ports and interrupts get assigned to COM3 and COM4. This means that you have to be sure your hardware and software agree on these points. 2) Because of this lack of standardization and lack of BIOS support for COM3 and COM4, you may have difficulty using the ports with any application that tries to access the ports using other than MS-DOS system calls. -- Peter Fales UUCP: ...ihnp4!ihlpe!psfales work: (312) 979-7784 AT&T Information Systems, IW 1Z-243 1100 E. Warrenville Rd., IL 60566