A2620 4MB
| 
 Company 
Commodore, USA  | 
 Date 
1988  | 
 Amiga 
A2000  | 
 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
 
recapped with Rubycon brand 105° type
ROMs:
A2620_A2630_ROM_v04.zip
A2620_A2630_ROM_v07.zip


