You may still find them on ebay, either NOS or usd chips. You just use a 27sf512. They are cheap and work great. If you don't wanna re-burn a bunch of times, just pickup a ostrich or two(depending on what ecu your using) It is a rom emulator that is made by moates.net. Craig Moates has been making quality products for many years now. You may also want to buy a consult cable with software and obviously a wideband O2. There are many rom editors out there like liveedit. it works good but, it has bugs. Like the mods made to injector size or MAF setting won't show up. You have to remember what you set them to. Crome will read nissan .bin files but, it dosent have the correct options to properly modify the .bin file. There is this new software out called nismotronic. It looks very promising. I'm about to buy it just to try it. NismoTronic