Making repoduction NES/SNES carts?

Hm. It might be a stupid questions after all the hassel, and by the way thanks to TriMesh for counting all posibilitys down, but: How is it about not eraseable Memory devices?
Most of the ppl that do ROM replacement do that on a certain card and not only few of them seems to have a special game in mind that they want to play/to patch. So beeing able to flash/reprogramm the entire card dont alwas is a must/have.

I was looking around for some seemable devices that accept a one time write cycle. But since im a noob with only some weeks exp in this topic I failed hillarious to find something but EEPROM and Flash Devices with the needed specs.

 

Eproms are small capacity for the most part and relatively expensive to new and current chips.

Also eproms tend to be DIP which are larger physically

 

I have a question in regards to zelda AST. Does anyone know here how the memory banks work? There isen't much information about this cart out there and this is a tougher one. I know how to do it with 4x 29f032 but i'd be nice to only use 2 of them. I know they use 74ls139 and 74ls393. I seen a wiring diagram before but it was only for 4.

 

Does anyone know of an equivalent SRAM chip that is available today (SMD or Through Hole) or one that will work for most games that have SRAM? and what is a way to get around the CIC chip or whatever security the system checks for? I'm basically looking into building my own board from scratch and would like to have some idea of what parts I can use, oh and I will be definitely looking into larger and more readily available and cheaper Flash Memory. Any input would be helpful,thanks.

 

I think a SuperCIC can be used in "key" mode so you can use it on a cartridge. Cartridges like SD2SNES and PowerPak use that.