So I just tried to make Gley lancer and I am 90 % sure the problem has to do with the region somehow. I downloaded a japan rom and then patched the file to english translation. This is apparently a dual-patch rom.
http://www.romhacking.net/translations/1173/
Anyhow I got the exact same problem as I did with the pal wily wars I tried converting to U. Soon as produced by sega went off I got a red screen. I opened with a hex editor and it says it is 55 for usa but in the text it has
UJ listed.
Any ideas why this is locking up and how to fix it?
Well after going back to the beginning of this thread. It appears you have wrote the checksum is probably bad. I downloaded that ucon64 program you mentioned. Seems like a headache. I have not done command stuff much at all and not really any since like 2004. Not really wanting to figure this out right now.... maybe later.
I found a tool that is made for genesis and checks checksum and fixes it, very easy gui. It said it is all good.
http://www.romhacking.net/utilities/342/
edit...
I make my own problems......
I was looking at the wrong pin-outs.
So as a correction the game works fine now. On my test board it is already set-up properly. I'm not sure what I did wrong the 1st time but the game works now and the master code is not required.