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From: ivar@acc.uu.no (Ivar Hosteng)
Newsgroups: comp.unix.xenix
Subject: multiple communication ports
Message-ID: <113@accsys.acc.uu.no>
Date: 22 Jul 89 13:55:50 GMT
Organization: Advanced Computer Consultants, Oslo, Norway
Lines: 19

I have a problem using my serial ports with Xenix 386 2.3.2. I have a standard
dumb com4 card with no polling register. The card can use IRQ lines 2,3,4,5.
I have managed to use 3 of the ports by assigning them to IRQ 3,4 and 5 and by
editing my master and sioconf.c file. But I cannot enable the fourth port.
Is there a way to let two of the ports use the same IRQ line and making an 
entry like this in the sioconf.c file:

{0,IBM_BOARD,   2,4,0,  (sd)0x3e0,0,                8,MCRBIT3}

When I do this Xenix finds the ports in the boot sequence but when I try to
write to the port the task hangs until I press DEL. Nothing gets written to
the port. 

Please answer by email. Thanks in advance for the answers I get
-- 
------------------------------------------------------------------------------
Ivar E. Hosteng,	Advanced Computer Consultans, Oslo, Norway
Internet:		ivar@acc.uu.no
UUCP:			...!{uunet,mcvax,ifi}!is.uu.no!ivar