Mapper 105, dipswitches

As far as I know, it's only " The Nintendo World Championship" cartridge that uses this mapper. Documentation refers to dipswitches that adjusts the playtime for the games.
However, I can't find any information on where these dipswitches are mapped? $4016/$4017?

The IRQ isn't "mapped". It just controls how long the IRQ timer runs.

So, the dipswitches aren't detectable by software?

The only way to detect them by software is to start the timer and then count vblanks or CPU cycles until it finishes.

Ok I thought it worked the same way as dip-switches with VS-games, but obviously not..