Cart DB #490: Happy Bichi

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	27F080
IC3	6264
IC4	AX5202P(MMC3)
IC5	T9553(DIL32)
BAT1	CR2032
C1	100n
CART1	FAMICOM_CART
D1
D2	m
R1	2.2k

Name

Value

IC1

IC2

IC3

IC4

IC5

BAT1

CR2032

100n

CART1

FAMICOM_CART

2.2k

There are two "epoxy blob 32 pin" CHR memories, soldered one on top of the other. At first I thought, they are 128 kB each making total of 256 kB, but after desoldering and closer examination I found that bottom memory has only D4..D7 pins connected and top one - only D0..D3 (other data pins are milled out so they don't make connection). I was wondering what is stored in those "not connected" data pins, so desoldered each of them and then read them back chr-bottom [d4-d7 wired].BIN chr-top [d0-d3 wired].bin As you can see in comparision, "chr-bottom [d4-d7 wired]" has some internal breakup - in every 256 byte block, first 16 bytes has D2..D0 always set high. I don't think this is some kind of "fix". Rather intentional behaviour (you need to have both roms soldered in order for game to be OK) chr.bin is the merge of those bin's in a way it reflects their physical connection) Next interesting thing is the T9553 epoxy blob - it inputs MMC3-CHR A17..A12 and MMC3-PRG A17..A14 (as well as CPU D2..D0, R/W, ROMSEL, M2, CPU A14..A12) and drives PRG A17..A14 and CHR A17..A12. I don't know yet if this is a permanent behaviour or can be configured, but after power up, it shuffles MMC3 bits controlling PRG and CHR banks: [code] 76543210 <- $8001 for PRG banks |||||||+- PRG A13 (always) ||||||+-- PRG A17 ||+--- PRG A14 |+---- PRG A16 +----- PRG A15 76543210 <- $8001 for CHR banks |||||||+- CHR A10 (always) ||||||+-- CHR A11 (always) |||||+--- CHR A13 ||||+---- CHR A14 |||+----- CHR A15 ||+------ CHR A17 |+------- CHR A12 +-------- CHR A16 [/code] Happy Bichi [roms read from programmer].nes is pure merge of prg.bin + chr.bin Happy Bichi [prg+chr bits reordered].nes is after applying those shuffling.

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#
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