SNES Repro w/ 29f032 chip - FFIV (FFII USA)

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) 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

 

Snip them off and rewire A21 and A20 to GND and WE to VCC.

 

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...)

 

Those are just decoupling/bypass capacitors, you can replace them with standard 100nF ceramic caps.

 

OK, thanks again for your help

 

Just finished it and it works great