# Switches 1/4, 1/5, 1/6 and 1/7: interrupt level

The interrupt level is selected by a combination of settings on switches 1/4, 1/5, 1/6 and 1/7.

Interrupt | Switch 1/4 | Switch 1/5 | Switch 1/6 | Switch 1/7
IRQ 2 | OFF | OFF | OFF | ON
IRQ 3 (default) | OFF | OFF | ON | OFF
IRQ 5 | OFF | ON | OFF | OFF
IRQ 7 | ON | OFF | OFF | OFF

- Select an interrupt level that does not conflict with any other boards or devices that are installed in your computer.

- Some applications, such as the IBM 3270 Emulation Program, do not work with all interrupt levels.

- Several interrupt levels are used for particular purposes and this may also affect your choice. Click here for examples.