Amiga Processor Peripherals

Commodore A3640

> Company: Commodore, US
Date: 1992
Amiga: 3000, 4000
Autoconfig ID: CPU slot

68LC040 / 68040 @ 25 MHz
can be upgraded to 50 MHz with the Doubler 4000

General Notes

There is no memory option providing slow motherboard RAM access. Memory can be added with the X-Calibur memory expansion board. It 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.

Amiga 3000 Notes

Only v3.1 or v3.2 versions of the board work in A3000. Version 3.1 works but has problems with certain Zorro cards which use DMA while version 3.2 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.


Amiga Commodore A3640 Front

Front: Commodore A3640 front view

Amiga Commodore A3640 Back

Front: Commodore A3640 back view