Re: sound support (Re: XMS problem with Aladdin demo)

[Julius Schwartzenberg <julius@zgod.cjb.net>]

Ryan Underwood schreef:
> More reply:
> 
> On Tue, Mar 08, 2005 at 11:03:23PM +0100, Julius Schwartzenberg wrote:
> 
>>>If you have the hardware, this works fine.  However, dosemu must be
>>>started as root.
> 
> 
> PS. Or sudo.
My Dosemu owned by root already has u+s. I thought that was about the 
same as running as root, but that indeed doesn't do.

>>Cool, I've just got this to work!
>>It doesn't seem to work fully though.
>>I've added this to my dosemu.conf:
>>$_ports=" device /dev/snd/seq range 0x388 0x38b"
>>I'm using a YMFPCI chip which seems to contains an OPL3.
> 
> 
> Yes, these chips do have a real OPL3, but must be enabled by the PCI
> configuration.  Since you are using this for MIDI seq, it is likely the
> case.  But the ALSA OPL3 driver may be using MMIO access and not PIO.
> Check your /proc/ioports to see where ALSA claims the OPL3 ports
> actually exists.
> 
> You can also enable IO-tracing for all of the mentioned ranges
> (0x220-0x223, 0x228-0x229, 0x388-0x38b) to see where the app tries to
> write OPL commands to.  If it is writing to the wrong range relative to
> the real hardware, it's possible to redirect that access.  Redirected
> access would be slower but with OPL this doesn't make much difference
> since there is so little I/O traffic.
In /proc/ioports the OPL3 is only listed at 0388-038b, which is why I 
set up that port range in Dosemu. The other ranges you mention to seem 
not to be used. Here is the full output of catting /proc/ioports:
http://haar.student.utwente.nl/~julius/ioports-laptop
I believe Wacky Wheels and Wolfenstein 3-D worked without problems when 
I ran them without Linux/Dosemu in DOS, so the hardware seems to be capable.

Thanks,
Julius