A3640 Company Commodore, USA   Date 1992   Amiga A3000, A4000   Interface CPU slot   processor 68LC040 / 68040 @ 25 MHz can be upgraded to 50 MHz with the Doubler 4000 general notes no memory option - slow motherboard RAM access memory can be added with the X-Calibur memory expansion board does not support the 040's burst RAM access (7/7/7/7 clock cycles - 14.3 MB/s memory bandwidth) on many A3640's the electrolyt capacitors are mounted in the wrong direction, reducing lifetime - even the PCB print is wrong A3640's made by Amiga Technologies have the capacitors in the right direction, but the PCB print is still wrong A3000 notes only v3.1 or v3.2 versions of the board work in A3000 v3.1 works but has problems with certain Zorro cards which use DMA v3.2 works correctly with Kickstart 2.04 the card does not work with the combination of Ramsey-04 and static column fast RAM at least bank 0 should be page mode RAM the combination of Ramsey-07 and DMAC-04 works perfectly with Kickstart 3.1 there's no such problem Photo Rev 3.1, front side Rev 3.2, front side Rev 3.2, back side Rev 3.1, back side blank PCB, front side blank PCB, back side