ckp@grebyn.com (Checkpoint Technologies) (10/17/90)
[ I'm posting this for an associate without net access... ]
Does anyone have experience using the IBM AT standard communications
port COM3 under Interactive Unix/386 version 2.2?
I'm running an Intel 386/33 with two standard serial ports on the mother-
board. My goal (unsuccessful so far, obviously) is to add an internal modem
as serial port 3. The modem is a Practical Peripherals (although I have
tried an Everex as well), that can reside at COM1, COM2, COM3, or COM4.
Interactive's Operating System Guide states a simple procedure for using
a standard IBM COM3 port, sharing IRQ 4 with COM1, but having a base I/O
address at 0x3E8. The procedure is to add the new asy device in the file
/etc/conf/sdevice.d/asy with a dummy, un-used IRQ (to bypass kconfig),
followed by hard-coding the address and IRQ for the additional device in the
file /etc/conf/pack.d/asy/space.c.
The problem is, the procedure doesn't work. I lose all communication
with both /dev/tty00 and /dev/tty02 (must be due to the interrupts banging),
while /dev/tty01 functions as it should. Disabling the second serial port
and rejumpering the modem will allow me to access /dev/tty00 (motherboard
COM1) and /dev/tty01 (the internal modem) without any problems.
Interactive is no help, they say it must be my hardware. I know from
the modem documentation that it does indeed support shareable interrupts
at IRQ 4, base 0x3E8 when jumpered for COM3.
Having only cursory Unix experience, I also know that I can boot the
machine under DOS and properly address COM1 - COM3 as follows:
COM1 - IRQ 4, 0x3F8 to 0x3FF
COM2 - IRQ 3, 0x2F8 to 0x2FF
COM3 - IRQ 4, 0x3E8 to 0x3EF
Ideas, anyone?
--
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Then, the disclaimer: All expressed opinions are, indeed, opinions. \ / o
Now for the witty part: I'm pink, therefore, I'm spam! \/hoepfner@usun01.UUCP (Andreas Hoepfner) (10/19/90)
In <22643@grebyn.com> ckp@grebyn.com (Checkpoint Technologies) writes: > COM1 - IRQ 4, 0x3F8 to 0x3FF > COM2 - IRQ 3, 0x2F8 to 0x2FF > COM3 - IRQ 4, 0x3E8 to 0x3EF >Ideas, anyone? Yes, I did it ! The only thing to do is to change your IRQ of the 3rd port from 4 to any free one, maybe 5 ! Edit your /etc/conf/sdevice.d/asy file and add a line for this port and create the necessary driver node ! It works great with my Terminal..... It is very important to have different IRQ's for each port... Andreas +-----------------------------------------------------------------------+ | Andreas Hoepfner | | | | paper mail: e-mail: | | | | c/o/ Nixdorf Computer AG USA: philabs!linus!nixbur!hoepfner.kd | | Abt. VTC 12 !USA: hoepfner.kd@nixpbe.uucp | | Heinz Nixdorf Ring | | D-4790 Paderborn | | tel.: (+49) 5251 107479 | +-----------------------------------------------------------------------+