> There are some non-mapped games who deserve some caution.
> Some old games like Theseus and River Raid does not implement
> lines A15 and A14 of the slot, this means the contents is replicated
> in 0000h,4000h,8000h and C000h. I would include them in a new class.
>
>       Ricardo Bittencourt

this can also be solved with the mask trick:

entry  mask   action
#0000  #c000  access RiverRaid ROM at (address AND #3fff)
#4000  #c000  access RiverRaid ROM at (address AND #3fff)
#8000  #c000  access RiverRaid ROM at (address AND #3fff)
#c000  #c000  access RiverRaid ROM at (address AND #3fff)

Jon

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