Famicom Jump Translation on "JUMP" Donor Board

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ednauseum
Posts: 6
Joined: Mon Feb 21, 2022 11:05 am

Famicom Jump Translation on "JUMP" Donor Board

Post by ednauseum »

I am trying to get a Famicom Jump translation working on a donor board from a Famicom Jump board and I am stuck, but think I am close (but could be a million miles away).

There are two boards that I am aware of, so far, in Famicom Jump carts:
  1. One labeled JUMP which has a BANIDAI 88 FCG-2 with a single 32 pin PRG ROM and a single 28 pin CHR ROM.
  2. One labeled JUMP A which has a BANIDAI 88 FCG-2 with two 28 pin PRG ROM (labeled PRG-1 and PRG-2 respectively), a singled 28 pin CHR ROM, and HD74HC130P.
I am using board "1" from the list above.

Generally it seems that it is standard NES pinout, but I am not getting the game to boot. Here is what I have tried and observed:
  • Using a 29F010 to 28 pin DIP adapter for the CHR
  • With that CHR in the board and using the original PRG, it does boot but the logo screen is scrambled (to a degree, it was expected)
  • I have tried PRG as standard NES pinout for 32 pin PRG, Flash (39SF040), standard pinout for 32 pin CHR, and even a adapter for EWROM boards and none have worked so far
  • While checking the pinout of the mapper and the PRG, I observed two, what I believe to be, anomalies
  • Pin 2 of the PRG ROM on the JUMP board is tied to GND. Normally it seems to be tied to PRG /CE on other mappers (FCG-2 does not seem to have a PRG /CE)
  • Pin 22 of the PRG ROM on the JUMP is tied to /ROMSEL. Normally it seems to be tied to PRG /CE on other mappers
I have successfully made a Dragon Ball 3 translation (albeit, the ROM is messed up). That is FCG-2 as well, but only has 28 pin for both PRG and CHR. On that I was able to use the aforementioned 29F010 to 28 pin adapter without issue.

Hoping someone might have some insight into what may be going wrong with the PRG ROM. I am guessing something with Pins 2 and 22, but I could not find anything that made sense to me, so far.

Maybe I can use the JUMP A board, split the PRG in half and use three of the 29F010 to 28 pin adapters?? I can try that, but would really like to see if I can make the JUMP board work.
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Joe
Posts: 774
Joined: Mon Apr 01, 2013 11:17 pm

Re: Famicom Jump Translation on "JUMP" Donor Board

Post by Joe »

ednauseum wrote: Sun Sep 07, 2025 4:14 pmI am trying to get a Famicom Jump translation working on a donor board from a Famicom Jump board
Are you sure the translation hack works on the same board(s) as the original game? Sometimes translations include modifying the game to work on a different board.
ednauseum wrote: Sun Sep 07, 2025 4:14 pmFlash (39SF040)
The PRG ROM pinout probably matches 39SF020. If you're using 39SF040, you need to duplicate the PRG ROM to 512KB so it fills the entire chip.
ednauseum wrote: Sun Sep 07, 2025 4:14 pmPin 2 of the PRG ROM on the JUMP board is tied to GND. Normally it seems to be tied to PRG /CE on other mappers (FCG-2 does not seem to have a PRG /CE)
Pin 2 is A16. Did you mean pin 24? If so, that's normal.
ednauseum wrote: Sun Sep 07, 2025 4:14 pmPin 22 of the PRG ROM on the JUMP is tied to /ROMSEL. Normally it seems to be tied to PRG /CE on other mappers
That's normal.
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