Message-ID: <361EE6D6.2AEE4F04@uswest.net>
Date: Fri, 09 Oct 1998 23:47:18 -0500
From: Phil Brutsche <brutsche@uswest.net>
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Subject: Re: What is the restriction on the # of serial line ports?
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Jack Schneider wrote:
> 
> i have a 286 happily running minix 2.0.0, it's got a 130 meg hd and three
> megs of ram and a built in DEC ethernet port, also it has 2 serial lines
> and a paralell printerport built in. I used  an ide adapter( DTC 2280e) to
> drive the disk. the adapter comes with 2 more serial ports which I jumpered
> to com3 & com4 with appropriate IRQ settings.  Minix comes with dev files
> for tty00 & tty01, what's needed to create tty02 & 03?
> My goal is to use the minix machine as an online I/O device to handle smart
> plotters, printers, modems, etc. (print server?)
IIRC, it only supports 2 serial lines - tty00 and tty01.  I've heard
that
this is because of the shared IRQs between the four ports (tty00 and
tty02
on IRQ4 and tty01 and tty03 on IRQ3.  I might have gotten the numbers
mixed
up, though) and Minix doesn't know how to deal with the shared
interrupts.

-- 
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Phil Brutsche

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