dav@abvax.UUCP (Dave A. Vasko) (06/12/89)
We are planing on connecting four serial ports to an IBM AT compatible
computer. Is there a standard I/O address location for COM3 and COM4.
If not is there a set of addresses that are commonly used. Also what
interrupt levels are used with COM3 and COM4.
PORT ADDRESS INTERRUPT
COM1 3F8-3FF IRQ4
COM2 2F8-2FF IRQ3
COM3 ? ?
COM4 ? ?
Any help on this subject would be sincerely appreciated.
Dave Vasko
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* Dave Vasko Allen-Bradley Highland Hts. Ohio 44143 *
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****************************************************************************ts@chyde.uwasa.fi (Timo Salmi LASK) (06/13/89)
In article <749@abvax.UUCP> dav@abvax.UUCP (Dave A. Vasko) writes: > >We are planing on connecting four serial ports to an IBM AT compatible >computer. Is there a standard I/O address location for COM3 and COM4. >If not is there a set of addresses that are commonly used. Also what >interrupt levels are used with COM3 and COM4. One roundabout way of finding out is looking at the setup menus of telecommunication programs. For example Telix (alt-O) or Procomm Plus (alt-S). In practice I have noticed, that what you have to use depends on what you have in those ports. For example I have a modem in com3, and when I changed the modem, I had to change (strange as its sounds) the com3 irq as well to keep com1 and com still operative. ................................................................... Prof. Timo Salmi (Site 128.214.12.3) School of Business Studies, University of Vaasa, SF-65101, Finland Internet: ts@chyde.uwasa.fi Funet: vakk::salmi Bitnet: salmi@finfun