[ltp] Second interrupt for sound hw

[Thomas Hood]

I have operated without using a second sound interrupt
for a long time.  I recently began wondering what the
heck this second interrupt is all about.

I guess that the second interrupt is only required if
you want to use the MPU-401 UART to connect to external
MIDI devices.  One ought to be able to play .mid files
on the ThinkPad without using a second interrupt.
With the ALSA drivers, .mid files have to be converted
to .wav format and played through the /dev/dsp0 PCM interface
(using a program like timidity).  I take it that the
OSS drivers support playing .mid files through the
/dev/sequencer interface.  (I presume the ad1848 modules
implements this.)  But doing this doesn't require
a second IRQ, does it?

Thomas

--- Tom Grydeland <Tom.Grydeland@phys.uit.no> wrote: 
> MIDI:
>     ADDr:	330
>     IRQ:	9
> 
> Sound works great (even the MIDI synthesizer), although on boot I get the
> message
> ------------------------------
> ad1848: Interrupt test failed (IRQ5)
> ------------------------------
> which doesn't seem to make any difference.


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