Another pirate port from FDS to famicom (after SMB2J, Nazo no Murasamejou and maybe many others that you can give examples).
This mapper uses non-standard bank alignment (very similar to LH-53).
I would attach the ROM but can't see anything that I can make IPS patch from.
I tested the PCB with the mapper 103 ROM as I made my own PCB for this but the game just crashes.
It boots, shows title screen but as soon as first ballon pops it jumps to character select screen.
After I choose character the game crashes.
I have checked every connection twice and they all match krzy's schematic.
Added screenshots just in case.
P.S. I know connector 57 and 58 (CIRAM /CE and PPU /A13) are tied together.
I did this afterwards but still same error.
So either something wrong in the schematic, my board or this is not mapper 103.
EDIT: Don't mind the missing CIC. It's disabled in my NES anyway and NES clones usually don't have them anyway.
EDIT2: Confirmed this is mapper 103. Krzy's dump is exactly the same as FDS Conversion ROM found in GoodNES.
As you can see, the signal used to generate RAM /CE uses many gates, lot of paths with different length (up to 7 gates), which might result in hazards or quick pulses.
Your SRAM is 70ns which might be vulnerable to such hazards (original was 200ns). Try slower RAM or some circuit do delay falling edge of RAM /CE.
I'm also sceptic to HC chips, should be rather LS or HCT.