Some weeks ago I had to convert a 16kb cartridge to 32kb, but the cartridge didn't have the A14 pin on the connector. So instead of using A14 to decode the address, I used /CS1, which was present in the connector, and it worked fine. I've taken some pictures, in case someone needs to do something similar in the future:
https://sites.google.com/site/ricbitmsx/hardware-development/adapting-16kb-sharp-cartridge
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