We had a discussion about SKROM
before so those info can be applied to TKROM.
But the function of some analog parts were not found.
Can anyone please explain the function of the remaining parts?
B1 (CR2032) : supply power for WRAM when Famicom is turend off in order to keep save data.
D1 (1N4147) : ?
D2 (1N4148) : prevent CR2032 from powering the whole cartridge.
R2 (1K) : prevent WRAM from using CR2032 when the game runs.
CB (22uF) : when the power is turned off, the voltage will slowly decrease from 5V to 3V instead of doing a sharp edge.
R1 (10K) : disable WRAM when the power is off.
R3 (27K) : pull down resistor for M2 in order to prevent unwanted writes to WRAM
C1 (22uF) : ?
C2 (100nF) : bypass capacitor for CHR.
CC (220pF) : ?