Re: How-to disable irq4 serial ints

[Stas Sergeev <stsp@aknet.ru>]

Hello.

Hufnus wrote:
> Problem is, if the serial device on /dev/ttyS0 is receiving
> data and generating ints, this serial servicing tsr crashes
> during its init.
So finally you did what I suggested,
and located the broken DOS program
instead of presuming the bugs in dosemu?
Good work, keep it that way:)

> Basically I was wondering, if masking the PIC with a 0x04 by doing
> I/O to port 0x21 would work in dosemu emulation or if there is a
> better way to do this?
This *of course* works under dosemu.
But this may be irrelevant. Because
unless I am seriously mistaken, the
DOS doesn't unmask the serial port
IRQs by default. So if this is the
problem, you have to search further
and locate another broken program of
yours that unmasks the IRQ and forgets
to mask it back before exit.