Cart DB #517: 3-in-1 (MMC3 + ANROM)

Notes for chip search:

Use "+" as delimeter for all fields (except "cart name", where space is used); if many values are entered, all of them must appear in the cartridge then; case is not sensitive
"Mapper" is the actual mapper used by this cartridge hardware (might not match the one at wiki.nesdev.com, as at the moment I was analyzing this cartridge, there was no mapper assigned to it, so I had to assign my own number for testing)
"Original mapper" is the mapper used by licensed version of this game (for multicarts, it refers to mapper of the inside games, so 0+2 means this cartridge can run NROM+UNROM games)
Order in which you put values doesn't matter (you can write 7400+74138+7400 or 7400+7400+74138 to search for a cartridge that contains at least two 7400 chips and one 74138
Some chips (like PAL16*8) appear in cartridges as 16V8 or 16L8, so be sure to check both posibilities
Same goes for memories - type 27F080 to search for 32 pin memories, 27512 for 28 pin with two chip enables or MASKROM_1M_DIP28 for 28 pin with one chip enable
Same goes for mappers - some examples: AX5904(MMC1), AX5202P(MMC3), PT8154BM (9112MMC3), AX5208C(VRC4), 23C3662(VRC2)
Good news is that you can use wildcards, so 74139+*MMC3* will search for any cartrige that has at least one 74139 and MMC3 chip in any version

Name	Value
IC1	27F080
IC2	6264
IC3	27F080
IC4	74157
IC5	74157
IC6	AX5202P(MMC3)
C1	-
C2	-
C3	-
C4	-
C5	-
CART1	FAMICOM_CART
D1	DIODE
JP1	PINHD-1X6
R1	1k

Name

Value

IC1

IC2

IC3

IC4

IC5

IC6

CART1

FAMICOM_CART

DIODE

JP1

PINHD-1X6

3-in-1 (MMC3 + ANROM) * Game 1 (?) * Game 2 (?) * Game 3 (battletoads) Quite interesting cartridge that has ability to run MMC3 or ANROM (256k) game. Normally you would expect MMC3 + some latch to store ANROM bank + some mux (74157?) that would swich PRG lines between those coming from MMC3 or those from ANROM's latch. Here MMC3 controls PRG banking for both MMC3 and ANROM games. Because in ANROM mode, MMC3 is fooled (MMC3's A0 = VCC, MMC3's A13=A14=GND), any write to $8000-$ffff would result in targeting MMC3's PRG bank 0. Before switching to that mode, multicard menu need to set MMC3's BANKSEL register to 6. This approach does not require ANROM game to be patched at all. There is extra 6264 CHR-RAM on board used for ANROM. Another clever way is switching between CHR-RAM / CHR-ROM using only one common line wired to CHR RAM +CS and CHR ROM /OE (which is also used to switch 74174 between MMC3 and UNROM mode) The blob onboard has pinout matching the AX5202P with only a few differences: * instead of WRAM /CE there is PRG-A18 * instead of WRAM /WE there is CHR-A18 and between pins M2 and VCC there are a few extra pins thats seem to function as * mux between MMC3 CIRAM A10 and MMC3 PRG A17 (which is used as CIRAM latch in ANROM mode) * latch for the MMC3/ANROM pin This suggests that the blob constains genuide MMC3 with extra logic put on the same die. http://www.emu-land.net/forum/index.php/topic,53818.msg956192.html#msg956192

Cart name		Notes for chip search: Use "+" as delimeter for all fields (except "cart name", where space is used); if many values are entered, all of them must appear in the cartridge then; case is not sensitive "Mapper" is the actual mapper used by this cartridge hardware (might not match the one at wiki.nesdev.com, as at the moment I was analyzing this cartridge, there was no mapper assigned to it, so I had to assign my own number for testing) "Original mapper" is the mapper used by licensed version of this game (for multicarts, it refers to mapper of the inside games, so 0+2 means this cartridge can run NROM+UNROM games) Order in which you put values doesn't matter (you can write 7400+74138+7400 or 7400+7400+74138 to search for a cartridge that contains at least two 7400 chips and one 74138 Some chips (like PAL168) appear in cartridges as 16V8 or 16L8, so be sure to check both posibilities Same goes for memories - type 27F080 to search for 32 pin memories, 27512 for 28 pin with two chip enables or MASKROM_1M_DIP28 for 28 pin with one chip enable Same goes for mappers - some examples: AX5904(MMC1), AX5202P(MMC3), PT8154BM (9112MMC3), AX5208C(VRC4), 23C3662(VRC2) Good news is that you can use wildcards, so 74139+MMC3* will search for any cartrige that has at least one 74139 and MMC3 chip in any version
Mapper#
Original mapper#
PCB marks
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