Amiga or Atari. DTS ?
I may be responsible for that after stating some CPU doublers for ST or Amiga can be used on both possibly. It isn't unfeasible and technically very similar boards for both machines.
However it depends on the design and you would probably need to replace the 14mhz clock crystal with a 16mhz one for the ST matching 200% of the host machine's original speed of 68000.
Probably best to put this as an advisory caution on your ebay auction incase somebody thinks they can literally just plug it into an ST with no changes at all
PS did you ever get the 4mb trapdoor expansion on the A500 to actually show 4mb total RAM on the workbench screen as opposed to 2.5mb in the pictures before?
