Bandai LZ93D50 pinout
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Bandai LZ93D50: 52-pin shrink PDIP (Canonically iNES Mapper 159)
.---\/---.
?? | 1 52 | -- +5V
?? | 2 51 | -> PRG RAM /CS
PRG /CE <- | 3 50 | ?? ?
+5V ?? | 4 49 | ?? +5V
M2 -> | 5 48 | ?? ?
CPU A13 -> | 6 47 | -> PRG A17
CPU A14 -> | 7 46 | -> PRG A15
CPU A3 -> | 8 45 | -> PRG A14
CPU A2 -> | 9 44 | -> PRG A16
CPU A1 -> | 10 43 | <- CPU D7
CPU A0 -> | 11 42 | <- CPU D6
/ROMSEL -> | 12 41 | <- CPU D5
CPU D0 -> | 13 40 | <> CPU D4
CPU D1 -> | 14 39 | <- CPU D3
CPU D2 -> | 15 38 | -> /IRQ
R/W -> | 16 37 | -> CIRAM A10
PPU /RD -> | 17 36 | -> CHR A17
CHR A15 <- | 18 35 | -> CHR A14
CHR A12 <- | 19 34 | -> CHR A13
PPU A10 -> | 20 33 | -> CHR A11
PPU A11 -> | 21 32 | -> CHR A16
PPU A12 -> | 22 31 | -> CHR A10
PPU A13 -> | 23 30 | -> CHR /CE
GND -- | 24 29 | <- **
? ?? | 25 28 | -> I²C SCL
GND -- | 26 27 | <> I²C SDA
'--------'
** Grounded on BA-JUMP2. Floating on other games.
Seems likely to be an enable for reading I²C from $6000-$7fff (internal pullup, normally floating)
Bandai's variants of the LZ93D50 are almost as bad as MMC1.
BA-JUMP2: supports PRG RAM instead of I²C, replaces banked CHR-ROM with unbanked CHR-RAM, and increases PRG max to 512KiB:
PPU /RD -> | 17 36 | -> n/c
n/c <- | 18 35 | -> n/c
n/c <- | 19 34 | -> n/c
PPU A10 -> | 20 33 | -> n/c
PPU A11 -> | 21 32 | -> n/c
GND -> | 22 31 | -> PRG A18
GND -> | 23 30 | -> n/c
GND -- | 24 29 | <- GND
? ?? | 25 28 | -> PRG RAM +CS
GND -- | 26 27 | <> n/c
'--------'
Datach Joint ROM System: Two separate I²C clocks, replaces banked CHR-ROM with unbanked CHR-RAM, and external barcode reader.
This IC is actually a 52-pin QFP, with a slightly different pin order from the PDIP instantiation. The pertinent changes:
- I²C SCL is only for the internal EEPROM
- CHR A13 is External I²C SCL
- WRAM /CS drives a tristateable buffer that connects barcode data to CPU D3.
See also:
