I want to make a repro from Super Donkey Kong (Unl) [!].nes which is Mapper 182
It seems it is very similar to a regular TLROM / Mapper 4 game, but the address / data lines are swapped on MMC3 side.
How the data lines are swapped seems simple.
But I can't understand how they swapped the address lines :
Mapper 182 MMC3
A15 A14 A13 ~ A0
--------------------
$8000 -
100~0 ?
$8001 $A000
100~1 101~0
$A000 $8000 (addresses further scrambled, see below)
101~0 100~0
$A001 -
101~1 ?
$C000 $8001
110~0 100~1
$C001 $C000+$C001 *
110~1 ?
$E000 $E000
111~0 111~0
$E001 $E001
111~1 111~1
Any help?
Thanks in advance
It seems it is very similar to a regular TLROM / Mapper 4 game, but the address / data lines are swapped on MMC3 side.
How the data lines are swapped seems simple.
But I can't understand how they swapped the address lines :
Mapper 182 MMC3
A15 A14 A13 ~ A0
--------------------
$8000 -
100~0 ?
$8001 $A000
100~1 101~0
$A000 $8000 (addresses further scrambled, see below)
101~0 100~0
$A001 -
101~1 ?
$C000 $8001
110~0 100~1
$C001 $C000+$C001 *
110~1 ?
$E000 $E000
111~0 111~0
$E001 $E001
111~1 111~1
Any help?
Thanks in advance