[aclug-L] Re: ttyS1=[alt + F4] [oh ooh]

[Jonathan Hall <jonhall@xxxxxxxxxxxx>]

> > You're trying to do PPP over the connection?
> 
> no, ppp0 would be over ttyS3-- isa pnp modem--jumper set

Okay


> > There's no reason you shouldn't be able to... I just didn't know that's what
> > you were trying to do.
> >
> > What you describe sounds like a possible IRQ conflict... Are you sure
> > nothing else is using the same IRQ ttyS1 is using (IRQ3 would be normal).
> 
> not now, but when up and running there will be a crash if I tried to bring up 
> the ppp
> while I was using the ttyS1 as they share the same IRQ.

If at all possible, you really should get different IRQs for each serial
port...e ven if you aren't using the same IRQ on two ports at the same time. 
Set ttyS3 to IRQ5 or something if you can.  I'd be willing to bet that this
sharing of IRQs is what's causing your problems.


> > Also... are you using a null-modem cable, or a standard serial cable?
> 
> yes I am using a null modem, and I do get use out of it now, but when the 
> mgetty line
> is in my inittab, it also places a lock file on the ppp also.  The ppp is 
> dialing and
> then sees the lock file, and hangs up.

There's a way to share the line between ppp and mgetty... see the mgetty man
page, I don't remember the exact mgetty switch to use right off hand.  I do
know I have done it before, though.


> > And are both ends attempting to communicate at 38400?  And do both ends
> > have at least 16450 UARTs (I would assume they do if they're 486's or
> > newer).
> 
> they are both set at the same speed first 19200 then I bumped it to 38400.  
> If they
> are at different speeeds, you get gibberish at both ends.  I get the proper 
> graphics
> and communications, but it is only 16 bytes shot down, and then it waits 120 
> seconds
> and sends another 16 bytes..... (this is on the direct connection)

Okay.  If they're both using 16550 UARTs, you should be able to go clear up
to 115200 without problems... Probably not a big deal if you're just doing
text stuff, but if you start using PPP or transfering files over the link,
etc, the extra speed will no doubt be appreciated. :-)



--
"I'm just glad it'll be Clark Gable who's falling on his face and not Gary
Cooper." -- Gary Cooper, on his decision to not take the leading role in
"Gone With The Wind."
--
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  Jonathan Hall  *  jonhall@xxxxxxxxxxxx  *  PGP public key available
 Systems Admin, Future Internet Services; Goessel, KS * (316) 367-2487
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