You may like to look [link=http://www.spartanrc.com/]here[/link], the retail outlet for Model-Gadgets. I've used several of their 256k CAMPAC clones in the past with complete success. This variant is configured as 4 x 64k CAMPAC banks. To change banks you remove the CAMPAC cover and push a tiny button on the module to cycle between the 4 banks. On a 9C each bank provides an additional 24 models from 9 .. 32, for a total of 8 + 96. Each bank provides an additional bank of models 9 .. 32. The 9C cannot use all 256k of memory without this 'bank'ing or paging scheme.

If 24 extra models are enough, then you don't need to use the paging scheme and it works just like a 64k CAMPAC.

The good news is that it will work with both the 9C & the 9Z where it provides an extra 4 x 16 models depending on complexity. It's a well made unit and they have proved reliable in use.

Although this may sound like an advert, I have no connection with the manufacturer other than as a happy customer.
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Steve