Hello
I have made a NES Earthbound cartridge for my friend and I, using a TKROM PCB from NES Shadow Gate.
I followed instructions on the ROMLab website to prepare the CHR and PRG ROM files from a 100% clean Earthbound prototype ROM.
I stripped the header of the prototype ROM using uCON64 and then split the resulting clean Earthbound ROM using Hex Workshop into appropriate CHR and PRG ROM files of 256kb each.
I have used two 27c2001 EPROMs for CHR and PRG programmed at 100% correct programming voltages etc, and I followed the instructions on this website for connecting up to the TKROM cartridge PCB; (NES EPROM Conversions.txt).
Now the cartridge does seem to work just fine.. when I put it in and power on initially it boots up and you can play it. However I have a little annoying problem. When I power the NES off, and then back on again, I get a grey screen and the cartridge refuses to load.
The only way to get the cartridge to work again is to either press reset, and then it loads up instantly again, remove the cartridge and wait a while then put the cartridge back in again and power on, or remove the power from the rear of the NES then power back on.
The NES has a brand new 72 pin connector, and I do not have this problem with my other original games, only the Earthbound reproduction cartridge that I made. My CIC-chip in the NES is disabled, I tried on a NES that does not have the CIC-chip disabled and the same symptoms occur.
I have checked the pinouts of the CHR and PRG ROMs against the 27c2001 EPROM and everything seems to be connected just fine.. I have googled/searched these forums and other places and I cannot find anyone with the same problem.. I have checked and double checked that the programmed files are OK..
I was just wondering if anyone has any ideas please as to how I might resolve this annoying little problem?
Thank you in advance..
I have made a NES Earthbound cartridge for my friend and I, using a TKROM PCB from NES Shadow Gate.
I followed instructions on the ROMLab website to prepare the CHR and PRG ROM files from a 100% clean Earthbound prototype ROM.
I stripped the header of the prototype ROM using uCON64 and then split the resulting clean Earthbound ROM using Hex Workshop into appropriate CHR and PRG ROM files of 256kb each.
I have used two 27c2001 EPROMs for CHR and PRG programmed at 100% correct programming voltages etc, and I followed the instructions on this website for connecting up to the TKROM cartridge PCB; (NES EPROM Conversions.txt).
Now the cartridge does seem to work just fine.. when I put it in and power on initially it boots up and you can play it. However I have a little annoying problem. When I power the NES off, and then back on again, I get a grey screen and the cartridge refuses to load.
The only way to get the cartridge to work again is to either press reset, and then it loads up instantly again, remove the cartridge and wait a while then put the cartridge back in again and power on, or remove the power from the rear of the NES then power back on.
The NES has a brand new 72 pin connector, and I do not have this problem with my other original games, only the Earthbound reproduction cartridge that I made. My CIC-chip in the NES is disabled, I tried on a NES that does not have the CIC-chip disabled and the same symptoms occur.
I have checked the pinouts of the CHR and PRG ROMs against the 27c2001 EPROM and everything seems to be connected just fine.. I have googled/searched these forums and other places and I cannot find anyone with the same problem.. I have checked and double checked that the programmed files are OK..
I was just wondering if anyone has any ideas please as to how I might resolve this annoying little problem?
Thank you in advance..