Question: i want to place my fn()1 in xdata 0x0100 is it possible by absolute address?
would guess nobody uses those pre-historic processors anymore, anyway.
Wrong on two counts. First, there's nothing pre-historic about 8051s with external memory. A CPU like the DS80C390 is by no means pre-historic. It's certainly unusual for an 8051, but it's quite current. They even still do mask revisions.
Second, your guess is wrong. Even processors very much like the original '51s are still used, even today. You try to find a rad-hard 8051 with internal memory, you'll know why.
Hans-Bernhard: an old saying goes: "it takes an exception to confirm a rule", so your post "wrong!" actiually confirms that Gary is right :)
Erik