Making a Takeshi no Chousenjou / Takeshi's Challenge English reproduction

[JohnnyPhantom]

Hey Everyone,
A while ago, I got my first Famicom system and really wanted to try our a game that used the mic in controller 2, and after seeing the game on a JonTron video, I wanted to try it. I also did a few reproduction games where I would get an eprom, program it, get a donor, remove the chip(s) on the donor, and wire in the eprom. I just took my Famicom stuff out of the closet, including a box of famicom projects I was working on that I'm hoping to finish. Takeshi's Challenge being one of them. Could someone please tell me the wiring for the erpom to the Takeshi's Challenge P3-029B/TAITO-UNROM board?

Looks like I put the chip in and wired it, just doesn't work. In the past I used this document for the pinout/conversions, but nothing on it seems to match what I did. I wonder if I was following some other article? https://archive.nesdev.com/NES%20EPROM%20Conversions.txt
also looks like I only changed the PR MASK ROM on the cart, using the original CH SRAM chip still on the donor

Thanks everyone in advance!!
~John

[P]

Maybe looking at the game in bootgod's database helps?
Note that this game uses CHR-RAM not CHR-ROM.

[JohnnyPhantom]

Maybe looking at the game in bootgod's database helps?
Note that this game uses CHR-RAM not CHR-ROM.

Sorry about that, I mistyped/misspoke I changed the PR chip/MASK Rom. the SRAM CH chip I left intact. I think I got everything correct, just not 100% sure on the wiring conversion of the eprom back on the original board. I found this, but seem's to have similar issues http://archive.nes.science/nesdev-forums/f28/t9215.xhtml Looks like they got it working on a NES pcb board, but not when put back on the original famicom pcb board (which is what I'm trying to do)

[emerson]

I would start by pinning out the PRG rom footprint to the card edge connector and glue logic. Draw up a schematic if it helps you. This, combined with knowledge of how the bankswitching circuit works, will provide the pinout of the original mask rom. From there replacing the mask rom with your rom chip is straight forward.

What rom chip are you using?

[JohnnyPhantom]

I would start by pinning out the PRG rom footprint to the card edge connector and glue logic. Draw up a schematic if it helps you. This, combined with knowledge of how the bankswitching circuit works, will provide the pinout of the original mask rom. From there replacing the mask rom with your rom chip is straight forward.

What rom chip are you using?

AM28F020 is the chip I have. I may try putting the chip into a UNROM donor and seeing if that works. The link I posted earlier ( http://archive.nes.science/nesdev-forums/f28/t9215.xhtml ) had the user try in a UNROM NES cart and it worked, just didn't work in on the original Taito board. I may try ordering a copy of Ide Yousuke Meijin no Jissen Mahjong and giving it a try

[emerson]

That is a 256KB chip, is your rom image 256KB? If not did you duplicate your rom image to make it 256KB? Also, did you assert either VCC or GND to any unused pins (VPP, /WE, etc.)? It's never good to leave pins floating.

Are you certain no through hole platings were destroyed while removing the original rom? Ensure solder is on both top and bottom pads of each pin/wire.

I still vote that you pin out the original rom chip yourself and compare it to your replacement rom. I've learned from many repro builds that this is the best method to getting things working. I usually would find I confused two pins.