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Eh to be fair I think the main reason Zorro III RAM cards didn't appear until way after the first Zorro III machine is that Zorro III wasn't coupled to CPU speed so sticking RAM there wasn't great from a performance perspective - you really needed to use the CPU slot to extend beyond 18MB (remember the 2MB of Chip in addition to the 16MB of Fast) in a useful way

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The studio I worked at during that time actually did have a CPU slot based memory extension that can handle I believe up to 256 Mb, this would have been around 92 or 93, but I'm not sure how early it was offered on the market that's just when I started there and it was already in the shop.

I don't recall the name of it though but I remember that it was a peculiar PCB design, with part of it resembling a breadboard. I think the name started with Ex, like Excelsior or Excalibur or something like that.

You didn't mention what machine this was on. Since you mention a breadboard, are you sure it wasn't an addon to an existing CPU card? Perhaps the X-Calibur, that plugged into the Commodore A3640? That's a bit later, though.

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