Original Apple, fully tested PowerBook 145 daughterboard containing the 25 MHz 68030 processor, 2MB of soldered onboard memory and one memory slot. Although interchangeable with the 145B daughterboard, the 145B board has 4MB RAM soldered although the total addressable memory of the machine is still only 8MB. This processor card will work on the Powerbook 140, 145, 145B and 170.