I recently bought the A2048 expansion for my A500 Rev 8A.1 and it's fantastic, but an idea for improvement that I could make myself came to my mind.
The thing is, that now that my A500 has 2 MB chip RAM, alongside the obvious advantages it has become slightly less compatible (e.g. Shadow of the Beast won't run from a floppy).
But I remembered that A2048 has that jumper that can "downgrade" it to a regular 512K trapdoor expansion. This unfortunately also requires reversing all the other steps from the upgrade (changing jumpers on the mobo, removing the wires for deactivating onboard RAM and passing additional signal etc.).
But what if I created a little board, where all the affected jumper pads, including the jumper pins on the A2048, plus the additional wires on the mobo would connect? Then, with a few clever connections and a few transoptors I could design a circuit that can alternate the Amiga between "512 K onboard + 512 K slow" and "2 MB chip" configs with the flip of a switch, by making all connections as they should be in a given config. Does that make sense? Are there some caveats I should be aware of? Cheers!