Discussion about the Korg PolySix synthesizer

I was looking for a CMOS ram replacement for my friend's pinball machine and came across a 5114 NVRAM module that appears to be a popular replacement for the 2114 family of CMOS RAM chips.

This obviously made me think of replacing the 5514 chip in my PolySix (no battery, plus a chip available at Digi-Key or Mouser, and extra address space for other projects); a quick conversation search here didn't turn up anything NVRAM-related. The module uses a Cypress FM16W08, which appears to be compatible with the 5514 (obviously not a drop-in replacement, but it has all the requisite pins). Seeing at the "pinball" chip+adapter costs a minimum of $25+shipping (for me), one could alternately use a cheap SMT breakout to mount the chip and solder the required leads.

The only caveat (well, the one that's documented) is that the /CE line has to be toggled for every read/write operation. The 367's /CE is on pin 8, which is controlled by IC25 (quad NAND gate), which is tied to the write enable (R/W), /WR (pin 10), /RD (pin 8), pin 34 (p17), & pin 4 (/REST) of the CPU, and pin 7 of IC5. I haven't connected my logic analyzer as of yet, thinking that someone here has tried to connect NVRAM before. 

Any insight would be appreciated

- Andrew

>
>
> I was looking for a CMOS ram replacement for my friend's pinball machine
> and came across a 5114 NVRAM module
> <http://www.pinitech.com/products/5114_nvram.php>that appears to be a
> popular replacement for the 2114 family of CMOS RAM chips.
>
>
> This obviously made me think of replacing the 5514
> <https://4donline.ihs.com/images/VipMasterIC/IC/TOSC/TOSCS32949/TOSCS32949-1.pdf?hkey=EF798316E3902B6ED9A73243A3159BB0>
> chip in my PolySix (no battery, plus a chip available at Digi-Key
> <https://www.digikey.ca/product-detail/en/cypress-semiconductor-corp/FM16W08-SG/428-3739-ND/4090348>
> or Mouser
> <https://ca.mouser.com/ProductDetail/Cypress-Semiconductor/FM16W08-SG?qs=sGAEpiMZZMtsPi73Z94q0OKOSVYv1Kg2JFUSe09H84A%3d>,
> and extra address space for other projects); a quick conversation search
> here didn't turn up anything NVRAM-related. The module uses a Cypress
> FM16W08 <http://www.cypress.com/file/41731/download>, which appears to
> be compatible with the 5514 (obviously not a drop-in replacement, but it
> has all the requisite pins). Seeing at the "pinball" chip+adapter costs
> a minimum of $25+shipping (for me), one could alternately use a cheap
> SMT breakout <https://www.adafruit.com/product/1208>to mount the chip
> and solder the required leads.
>
>
> The only caveat (well, the one that's documented) is that the /CE line
> has to be toggled for every read/write operation. The 367's /CE is on
> pin 8, which is controlled by IC25 (quad NAND gate), which is tied to
> the write enable (R/W), /WR (pin 10), /RD (pin 8), pin 34 (p17), & pin 4
> (/REST) of the CPU, and pin 7 of IC5. I haven't connected my logic
> analyzer as of yet, thinking that someone here has tried to connect
> NVRAM before.
>
>
> Any insight would be appreciated
>
> - Andrew
>
>
>
>

>
>
> That's exactly what I was thinking of! Cost-wise, I should have jumped
> on the Kiwi boards a long time ago, but for some reason, I enjoy the
> challenge of fixing issues as they pop-up (and applying mods such as
> this one).
>
> I'm definitely interested in a couple; please PM me or let the group
> know how to order...
>
> Thanks,
> Andrew
>
>
>