This is my replica of the Commodore A3640 card for the Amiga 4000. A very simple 68040 card with no onboard memory.
I later included the 040->060 adapter on the board so you do not need this adapter that can be troublesum
The A3660 STILL however supports the 68040 cpu. you “just” remove the 3.3V voltregulator, do a jumperwire from “IN” to “OUT” where the regulator is located, and on the right side you set the 0 Ohm resistor to the 040 mode.
The 74F257 on the bottomside WILL still be needed!
Originally from: http://wordpress.hertell.nu/?p=537
Files available at: http://www.reamiga.info/webfiles/A3660/