Originally posted by Chuckles
he told me that the pinout of the side expansion for both the A1000 and the A500 were the same, except that (as he put it) the board was "upside down", meaning that the StarBoards for both machines were interchangeable if they were oriented properly. So yes, the expansion slot is the same, so long as the device is properly oriented when it is plugged in. Not being a hardware guru though, I'd seek additional confirmation before trying any potentially mobo-frying experiments that might come to mind.
You're right, the expansion slots of the A1000 and the A500 are exactly the same except that on the A1000 the slot is upside down. But this fact makes a lot of A500 expansions unusable for the A1000, because they just can't be turned upside down.