nesdev.org

I need to remove Sram and battery from a pcb to use it with other game that doesn't need save game, anyone know where I can find this?

the same on the two Eproms?

So i let the snesA15 empty and put eprom A15 in snesA16 and so on until A19?

Ofcourse! but i tried with top gear 2 too and don't work as well. but, sorry my noob question, the 4 mb eproms don't have the A19 address, and you said A16 to A19 and A0 to A14 right? so there is not A15 used? or it is omitted to use A18 as "A19"?

I split an 8mb game(legend of zelda) into two 4mb eproms and put them on the 2A0N board but does'nt work, works only with 4mb games in just one eprom (left the other eprom slot empty) and the address line used on 74ls00 is A20 like on the YA0N

Thanks for the fast answer my friend, thats was exact whtat i searching for. So the YA0N pcb is for two 4mb eproms but i have 2A0n-10, its possible rewire the 74ls00 to make two 4mb eproms work on this board? or I need to use only YA0N?

The simplest way to do this is to connect A19 to the first chip's /CE (chip enable) line, and connect the inverted A19 (/A19) to the second chip's /CE pin. You need an IC that can invert A19 for you, such as the 74LS00. I need some kind of schematics to rewiring the 74ls00 to use two 27c040 or 39sf...

"can you use one of those snes boards with two mask roms to use two 27c040 to create a 1MB repro? I know people would usually use them to make a 2MB with two 27c801 but I have none of those and many 040" I have the same problem here, and I need some kind of schematics to rewiring the 74ls0...