INES Mapper 133

GoodNES allocated iNES Mapper 133 for the Sachen unlicensed game "Jovial Race". It's almost identical to NINA-06.

Санчез, however, allocated Jovial Race to iNES Mapper 150. Either way, its UNIF MAPR is UNL-SA-72008.

 Mask: $6100
 Bus conflicts for the mirror at $C100-$DFFF (don't do that)
 $4100: [.... .PCC] - Select 32 KiB PRG bank and 8 KiB CHR bank

Another physical release instead wired a Namco 108 clone in an inscrutably complex way:

 Mask: $E001
 $8000: [..B. .B.B] - Select register
 $8001: [...X XCCP] - Write value to register
            | ||||
            | |||+--- select 32 KiB PRG bank
            | |++---- select 8 KiB CHR bank
            +-+------ analog feedback path

Four of the registers produce an analog feedback path through the 108's CHR bankswitching registers:

XX bits	behavior
$00	if this register was selected, switch to using contents of register $04
$08	if this register was selected, switch to using contents of register $24
$10	if this register was selected, switch to using contents of register $01
$18	if this register was selected, switch to using contents of register $21

If this feedback path doesn't settle on one specific register, then the selected banks will rapidly switch between all the registers specified by the feedback path, and the 108 clone will get hot.

See also:

• http://cah4e3.shedevr.org.ru/%5Blst%5D-sachen-mappers.txt
• https://forums.nesdev.org/viewtopic.php?p=210246#p210246