Hi Everyone

I made a couple of new ROMs yesterday for a friend of mine, who wanted english language in his Rollergames instead of German. I decided to burn the LA2 roms for him. The size of each ROM file is 32kb, which as i understand it, fits a 27256 eprom. But the only eproms i had was W27c512, which as i understand it, is 64kb roms.

So i doubled the files (via something like: copy /b 32kb.u26 + 32kb.u26 64kb.u26) and burned the ROMS. No problems at all so far.
However, my friend is telling me that it doesn't work with the new ROMs i burned for him. He could have installed them wrong, but if he didn't, it could be something else. I am going to check it out today or tomorrow.

But it made me wonder: Does the Rollergames CPU board support the bigger ROM size? I would think that it does, as something like LEONs System 11 diagnostics ROM requires a 27512 chip. But perhaps some sort of jumper settings need to be made?

Does anybody have any info on this?

Thank you so much for clarifying that. It sounds as if i should be ok with 27512 eproms, without changing any jumpers, as long as i double them the correct way. I was in doubt, as i read somewhere that the original Rollergames ROMS were 27128 in u26 (16kb) and a 27256 in u27 (32kb).

So i guess, as the files i downloaded were both 32kb, that the code for u26 was already doubled. And then i had to double both of them again to get them to fit a 27512 (64kb).

I'll go see him in a couple of hours, and if i cant make it work, I'll try doubling the original downloadagain, taking extra care using the correct syntax, before burning a new set. I'm pretty sure i used the exact same syntax that you are describing, and of course adding u26+u26 and after that u27+u27.

And if the above fails, im pretty sure a saw another download on IPDB where the u26 was actually 16kb, and u27 was 32kb. I could try downloading that set, and then quadroupling u26 to fit on my 27512, and doubling u27 to fit on a 27512.

Sounds like a good plan

I just went by my friends house, and the eproms were fine. He just didn't mount them properly in the sockets, so one side of u27 practically had no contact at all. Once seated correctly, everything worked like a charm.

Thank you for helping out