========================
=  Mapper 185          =
========================

Example Games:
--------------------------
Spy Vs. Spy (J)
Mighty Bomb Jack (J)

Registers: (**BUS CONFLICTS**)
---------------------------
$8000-FFFF:  [..CC ..CC]
CHR Reg


Notes:
---------------------------
This mapper is retarded.  These games only have 8k of CHR, and they attempt to disable CHR by writing
a specific value to the CHR Reg, then VERIFY that garbage is read back, then they swap back to the
actual CHR.  If they don't get the expected garbage, they lock up.

Perhaps this was some sort of copy protection?

Each game has their own value that enables/disables CHR.  Rather than failing to attempt to list all the
exact values used here (I don't know what all of them are), I can provide some logic:

if C AND $0F is nonzero, and if C does not equal $13:  CHR is enabled
otherwise CHR is disabled

When CHR is disabled, the pattern tables are open bus. Theoretically, this should
return the LSB of the address read, but real-world behavior may vary.