[sdiy] SRAM Memory Upgrade (Old Sampler) ???

[::Phuture::]

Hi people,

Wow, it's been maybe 4yrs since i last was on this list!

So, I've got a question that relates to upgrading memory in a certain breed 
of old casio samplers.
I'm sure it's impossible to increase the actual sampling time, but I feel 
I'd certainly be able to increase the ammount of banks.

Right now, the sampler uses a single 32k x 8-bit 28-pin DIP CMOS SRAM. This, 
i believe, was the largest possible size in a 28-pin format. Now, hopefully, 
I'd like to install a 32-pin SRAM in it's place, which is organized as 512k 
x 8-bit (16 times the original size). Aside from the top 2-pins on both 
sides of the 32-pin IC, the rest of the pins line up with the original 
28-pin SRAM.

The difference between the two chips, besides the VCC being on a different 
pin, is that there is an additional (4) address lines....... All other pins 
are compatible with the 28-pin version.

Now, I'm no expert on how memory works.....but from my research it seems 
like adding 4 spdt switches to control the highest 4 address lines would 
give me (binary) access to switch between the 16 banks. Is this correct?

Aside from the additional banks, the newer SRAM would give data retention of 
10+ years because of an inbuilt lithium battery in the IC.

I'm a little techie, but still need some advise from a pro that can verify 
that this would indeed work, at least theoretically!

Thanks

Ryan (Plutonique9)

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