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A level shifter lets parts with different voltages "communicate" with each other, in this case it shifts 5V to 3,3V and 3,3V to 5V on the fly so a 3,3V flash can work in a 5V system. I use it to take a lot of load of the data lines which could damage the flash.

I've used 3,3V Flash on SNES carts. Just need an AMS1117 for Vcc conversion and a level shifter for the 8 Data Lines. Check the datasheet of the flash, some 3,3V Flashes are 5V tolerant so you wont need the level shifter.

In that case it should be much easier. Use a simple on/off switch, connect one pin to MAD-1 Pin 9 (/RESET) and the middle pin to ground.

Hey I just got an idea how you could do a hardware reset through software. Connect a single de/multiplexer to A23 & /RESET. When you want to reset, you just need to access any space that uses A23.

Thanks !

Can someone "spoon-feed" me to the correct parameters, I'm feeling like an airhead today

I was using LoROM mapping all the time with WLADX, but now I need HiROM. I can't figure out why the assembled ROM doesn't work, it just gives me a black screen. Here's my Header: .MEMORYMAP SLOTSIZE $10000 DEFAULTSLOT 0 SLOT 0 $0000 .ENDME .ROMBANKSIZE $10000 .ROMBANKS 8 .SNESHEADER ID "SNES&qu...

This is my idea for a Hi/LoROM switch:
I just used jumpers for now, it works. Later the switching will be done with two 4551 and a single on/on switch. In the future, I'll use a cheap MCU for reading out $FFD5 of the rom and auto switching to the appropriate setting.

You need some adress decoder logic. For example, look at a Mega Man X cart and how it's all wired, it uses a 74LS00 because it has 2 Roms. Shouldn't be to hard to "reverse engineer" this. Or look at this pic and figure out how to connect everything for your 27C040: http://snesdev.romhack.d...

Which one do you mean ?

If you`re referring to the one found on Caitsith2's site, it`s far from complete.

EDIT:
Oh, there finally have been some "good" schematics out for some time I didn`t hear about yet. Of course this makes my plan obsolete

Here`s what I`ve done today:

http://sfc.homepage.t-online.de/5A22.png

64 done, 36 to go !

I`ll be gathering some more in the next days, let`s see how far I can get. Help would be appreciated.