I had another go with the SRAM card I bought yonks ago, I still haven't managed to access it in my laptop.

I found this page, with some details on editing the /etc/pcmcia/config file.

So I tried that, I added:

card "SRAM Card"
  version "SMART Modular Technologies", " 4MB FLASH Card        "
  bind "memory_cs"

but had no luck.

I give up. I can't believe it's this hard, I should just be able to plug the card in, and have /dev/mem0c0c or something turn up.