Pal to NTSC game??

[maxharm]

Ok I'm able to locate the chip , what is it serial number or a substitute on the market?

[maxharm]

I'm searching for Cmos 32M-bit but I can't be sure that the pinout is good and the capacity is enought.

[declan]

This page here will have the Mask Rom pinout.
Though i think it only has the 32 pin rom pinout. If you want the 36 pin rom pinout, it is just the same as the 32 pin package only, they have put an extra 4 pins at the top of the chip.
If you have trouble geting the 36 pin chip pinout, i could get it for you.

As for the 32 Mbit EPROM (the programmable chip you want to replace the mask rom with), i think 32 Mbit chips are hard to come by these days.
your best bet would be to get 2 x 16 Mbit chips and an address decoder chip so that each chip will be addressable in a different range, and effectivly working as one 32 Mbit chip.

The link i showed you above will have all (or most) the info you need to do all that.

As for the 32 Mbit have enough capacity, most of the games you want to play will fit within those limits, BUT you really should just check the size of the rom you are working with. and if you need to, you could attach 4 x 16 chips to the address decoder.
This would push the snes to its maximum capacity (unless you want to start using bank switching, like they did on the NES, which gets really messy)

[maxharm]

Okay thank you very much , I was already read about that and this is the solution that I will take. I think I will use four "27C801-1120B1" with a "74LS139" decoder it appear to be a good way to do the job.

[declan]

27C801 (8MBit EPROM) is probly a better choice than 27C160 (16MBit EPROM), because the 27C160 has a 16-bit data bus and snes data bus is only 8 bits wide, so different wiring and more IC's are needed.

"74LS139" decoder it appear to be a good way to do the job.

The 74HCT138 would be a better choice, 'cause the 74HCT139 only connects to 4 EPROMS, and if using the 27C801, you are restsriced 32Mbit's.
The 138 on the other hand con comunicate with up to 6 chips! So with 27C801's, you have 48Mbit's to use.

[maxharm]

Okay , I understand but is I need to use more than 32mbit?

[grinvader]

A handful of games are above 32 megabits.