MAMEWorld Forums - EmuChat - Re: Sega System 1's "SW 0 READ FROM" dip switch

> > What's the purpose of the "SW 0 READ FROM" dip switch (switch 8 on bank B)? I've
> been fiddling with it and can't see any obvious differences.
>
> There is NO difference in MAME because BOTH IO adresses (0x0d AND 0x10) are mapped to
> read Dip Switch bank B :
>
> AM_RANGE(0x0d, 0x0d) AM_MIRROR(0x02) AM_READ_PORT("SWB") /* DIP1 some games read it
> from here... */
> AM_RANGE(0x10, 0x10) AM_MIRROR(0x03) AM_READ_PORT("SWB") /* DIP1 ... and some others
> from here but there are games which check BOTH! */
>
>
> Steph from The Ultimate Patchers

Ok, that's interesting, because on my Spatter PCB changing the eighth dip switch changes the backgrounds. In MAME always the same two backgrounds are shown during the gameplay demos in the attract mode. On mine changing the switch changes the backgrounds. I'll have to check it out further.

Thanks!