[comp.unix.xenix] Use of COM3 / INT5 / 0x2e8 base

andrew@stl.stc.co.uk (Andrew Macpherson) (03/11/89)

Configuration SCO 386 2.2, Toshiba 5200/100 with toshiba modem.
No hardware manual (yet).

Can someone help please?  I've had *such fun* trying to get my
third port active.

If I set up so that all 3 are live (Port A = int4, Modem = int3 (Com2
in effect) and Port B = int5) with a standard kernel Xenix thinks
I have a 4-port Sperry/Mitsubishi Com3 card.

Great I thought --- sniff around in sioconf.c, and put in the parameters
for my 2nd serial Port (I want that modem to be a live tty2A) and away we
go!   Well so much for theory.  1 recompiled sioconf.c in the library,
edit "master" to give int 5 to the sio handler, as well as the printer,
(losing int 27 in the process, but I don't have that board) and re-make

c.c is now handling vector5 as one would expect, so I am hopeful.

Re-boot with the new kernel.  Hmmm.  Sperry board has 1 port,
Sperry board has 4 ports.  Ah well --- probably just spotting the normal
boards?  anyway It thinks I've a single port board at COM3 so 
it's looking good.

Enable tty3a.  Seems I've a very looseline at serial 7, so much so that
I can't do anything else.  FSCK time again.

Anyone actually done this?
Andrew Macpherson         | God bless the King! --- I mean the Faith's Defender
PSI%234237100122::andrew  | God bless (no harm in blessing) the Pretender!
andrew@stl.stc.co.uk      | But who Pretender is, or who the King, ---
..mcvax!ukc!stl!andrew   | God bless us all!  That's quite another thing.