I have been playing around with making SNES repros (using original Jap carts of the same games) using the m29f032 chips on the Type III adapters from buyicnow.com. I have successfully made a Chrono Trigger repro, but I got stuck with my FFIV one (that's FFII in the USA originally) - the Mask ROM on the FFIV cart PCB has 32 pins, while the m29f032 adapter board has 38 [edit - 36] pins and, as a result, doesn't fit. Should I simply snip the legs off the adapter for the "top 4 pins" (i.e. pins 1, 2, 37 & 38 [edit - 1, 2, 35 & 36]) and solder the rest of them in? Or is it just that the m29f032 chip cannot be used on PCBs with these "shorter" chips? I can, of course, use an M27c801 chip instead as the ROM is only 8Mb in size and the 801 has the requisite 32 pins - but that's not the point. Cheers
OK, thanks I started to take off the existing Mask ROM and I managed to break one of the caps on the board (because I'm a clumsy fool) - can anyone tell me what the capacitance of it was so I may replace it? I think the other one you can see in the picture has the same colour markings on it: (EDIT - I stuck the colour codes into a calculator online, and it says it's a 1.6µF cap - does this sound right? Not sure if I'm making out the colour markings correctly...)
Every missing address line cuts the size in half, so without A21 it would be 16Mbit and without both A21 and A20 it would be 8Mbit. Or the other way around: 2^22 = 4194304 bytes. (A0-A21 = 22 address lines) 2^20 = 1048576 bytes (missing two address lines) Maybe you can rewire them manually, I have not testet that.
i have a question... i cannot find 29f032 in the tl866s chip list, i see that most used are ST and STs list doesnt contain it... what chip selection did you use to program?
Set the programmer for the 29f033 chip (which the programmer IS compatible with), then disable the ID check. EDIT - ninja'd
bad_ad84 beat ya to the punch! hes always on top of everything! thanks for the tip, maybe i wont write off doing some snes repros...