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74LS139 Logic inside SNES Cartridges

Posted: Fri Aug 07, 2015 6:29 am
by Ice Man
I've already succeed in resoldering the onboard 74LS139 Decoder found in SHVC-1AXB-XX boards to support 27c322 (32MBit) games and save properly.

Connections here:
Pin 01 = SNES Cart 49 /OE
Pin 02 = SNES Cart 40
Pin 03 = SNES Cart 40
Pin 04 = Pin 15
Pin 05 = NC
Pin 06 = NC
Pin 07 = ROM /OE
Pin 08 = GND
Pin 09 = RAM /CE
Pin 10 = NC
Pin 11 = NC
Pin 12 = NC
Pin 13 = A21
Pin 14 = A20
Pin 15 = Pin 04
Pin 16 = VCC

However, I'd like to know how this will work for HiROM games?
There's only one afaik: Final Fantay V that uses SHVC-1J3B-XX board.
Does anyone have the 74LS139 pinout for that cartridge?
Help appreciated.

Re: 74LS139 Logic inside SNES Cartridges

Posted: Sun Aug 09, 2015 2:24 pm
by MaxTheWhale
Here is the 139 pinout from my 1J3B-01 cart:

Pin 01 - SNES Cart 40 (A15)
Pin 02 - SNES Cart 38 (A13)
Pin 03 - SNES Cart 39 (A14)
Pin 04 - NC
Pin 05 - NC
Pin 06 - NC
Pin 07 - Pin 15
Pin 08 - GND
Pin 09 - NC
Pin 10 - NC
Pin 11 - RAM /CE
Pin 12 - NC
Pin 13 - SNES Cart 47 (A22)
Pin 14 - SNES Cart 46 (A21)
Pin 15 - Pin 7
Pin 16 - VCC

Re: 74LS139 Logic inside SNES Cartridges

Posted: Wed Aug 12, 2015 12:39 pm
by Ice Man
Thanks alot, that will help me.