h-a-l-9000 wrote:

> what IRQ is used when a serial device is configured without an IRQ? […]
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> what IRQ is used when a serial device is configured without an IRQ?

COM1 IRQ4
COM2 IRQ3
COM3 IRQ4
COM4 IRQ3

It is 'clever' to offer another IRQ numbers by frontends here?

IMO it's not important enough to bother...

It is 'clever' to offer another IRQ numbers by frontends here?

You can do that, but then you'll always need to assign a IRQ command to the generated DOSBox conf file if a device is configured, making the entire profile "database bigger".

It does depend on the way you allow your users to configure their IRQ.

If they can choose not to add a IRQ command or not. If they can choose such an option, then it is a problem for the users as they tend to believe that when the option "Add IRQ" is off that IRQ 3 is used for serial 4, wich then does not coincide because of the override by the frontend.

If your users can't coose a "Add IRQ" and an IRQ is always added then this is less of a problem.

In my frontend I just warn people that lets say Serial Device 3 has the same IRQ as Serial Device 1.

Most people won't get that warning though as most people seem to stay away from the communication devices.

Erik.

Thank you all, I think, I should leave these values to default w/o having the users to bother.. 😀