Hey guys and girls, I've decided to try my luck with another conversion so I bought a Japanese version of Chrono Trigger to use as the donor thinking it would be easiest for a beginner. Turns out the PCBs differ as can be seen from the scans, Japanese has got an extra Mask ROM U0 P0 (36 pin) U1 P1 (32 pin) Chrono Trigger USA SHVC-1J3M-20 http://www.snescentral.com/pcbboards.php?chip=SHVC-1J3M-20 Chrono Trigger JAP SHVC-BJ3M-20 http://www.snescentral.com/pcbboards.php?chip=SHVC-BJ3M-20 What I've tried so far 1) Removed the Japanese chip and soldered the English version in it's place- U0 P0 while leaving U1 P1 intact 2) Removed Japanese U1 P1 chip Both have been unsuccessful, all I get is a black screen. I'm hoping there's a way to disable the U1 P1 so I can get this going? Thank you very much I am looking and trying to make sense of the following: http://wiki.superfamicom.org/snes/show/Schematics,+Ports,+and+Pinouts MAD-1 Pinout The MAD-1 stands for Memory Address Decoder revision 1. It is used for memory mapping in both HiROM and LoROM. And is used for battery power control on a static RAM. /HI 01=======================16 /LOW SRAM /CS 02=================15 A15 (LoROM), A13 (HiROM) NC 03=======================14 BA4 (LoROM), A14 (HiROM) ROM /OE 04==================13 BA5 SRAM Vcc 05=================12 Vcc or BA6 (LoROM), A15 or BA6(HiROM)... Vcc 06=======================11 /CART (pad 49 on cartridge edge) resistor to +3V of battery 07=======10 GND=LoRom, Vcc=HiROM GND 08======================09 /RESET (pad 26 on cartridge edge) /HI <--- if two ROM chips, this selects the upper one /LOW <--- if two ROM chips, this selects the lower one Verified & Simplified by kyuusaku Pin 9 is A Pin 10 is B Pin 11 is C Pin 12 is D Pin 13 is E Pin 14 is F Pin 15 is G The Logic (Invert Outputs) ========================== Pin 1 is G E C' A + E C' B A Pin 2 is G F E D' C B A + G' F E D C' B' A + SRAMVCC' Pin 3 is G F E' D' C B A + G' F' E D C' B' A Pin 4 is G C' A + C' B A Pin 16 is G E' C' A + E' C' B A The part where pin1 on the MAD-1 selects upper chip looks interesting. Maybe it needs to be connected elsewhere as I don't want it to select the upper ROM chip
29F032 with the tsop adapter (Seiken Densetsu 3 worked fine as both USA and JAP carts have one ROM chip)
Try this http://www.mmmonkey.co.uk/converting-mother-2-cart-to-earthbound/ I did a chrono trigger and I only removed the first mask ROM and I used this guide removed the two pins and soldered directly to the mad 1 chip and it worked.
Thank you very much. I've been searching high and low while waiting for a reply and didn't bother to check that great website :$ Will give this a shot tomorrow when I'm home EDIT: Thanks bochu all good now <3
I have a copy of the Japanese Chrono Trigger but my copy looks a lot like this: Is the procedure basically the same or is there an easier less SMD intensive chip I can use?