Amiga Processor Peripherals


Commodore A2620

> Company: Commodore, US
Date: 1988
Amiga: 2000
Interface: CPU slot
Autoconfig ID: 514/80

Processor
68020 @ 14 MHz, synchronous with the motherboard
68851 memory management unit
factory installed 68881 @ 14 MHz, supports FPUs up to 68882 @ 25 MHz
can be upgraded to 68030 with the Harms Professinal-Pack 030 board

Memory
2 or 4 MB 32 bit RAM
16 or 32 256k×4 page mode ZIPs 80-100 ns
not expandable
RAM can be disabled or autoconfigured by setting a jumper

Notes
the first accelerator board for the A2000
boot ROMs below rev 6 are incompatible with Kickstart 2.0 and above
the ROM address space overlaps the upper 256 kB of the 512 kB Kickstart ROMs (Kickstart 1.3 is 256 kB only)
by the time AmigaOS loads, the boot ROMs are supposed to be off but due to a bug in the A26x0 ROM code they remain active, causing an address space collision
fitting a rev 6 or 7 ROM pair solves the problem
some boards are reported being incompatible with the newer ROMs either
in 68000 fallback mode the RAM is still available

Images

Amiga Commodore A2620 Front

Front: Commodore A2620 front view

Amiga Commodore A2620 Back

Front: Commodore A2620 back view