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A2000 Accelerators
Commodore: A2620
Connection: CPU Fast Slot (A2000) |
These
are two pre-production boards. The first one is Revision 1 and the
second is an earlier revision (although it says 3 on the board). The
first one uses ZIP memory while the second uses socketed DILs.
These
two are both revision 3 boards. The first one is possibly a
pre-production unit, as it is missing the boot ROM and the FPU.
Rev 3 A2620
Rev 3 A2620, Back
Hi Res Version, Rev 3 A2620 - 1808K
Hi Res Version, Rev 3 A2620, Back - 61K
Processor: | 020@14Mhz |
FPU: | 68881@14Mhz (PGA). Can be changed to a faster component if a separate crystal is installed |
MMU: | External 68851 (PGA) |
Max Ram: | 4MB |
Ram Type: | ZIP Chips (prototype versions use DRAM Chips with sockets) |
An accelerator for the A2000 which plugs into the CPU Fast Slot. This accelerator also has ROMs to support booting the other official Amiga operating system called Commodore Amiga UNIX (Amix). In order to use AmigaOS V2.0+ you need at least version 6.6 of the A2620 ROMs, but preferably V7.0. The right side of the card shows the date and week of manufacture
Jumpers
Jumper | On/Up | Off/Down |
---|---|---|
J302 | Use 4 Layer (use with German V4.0 A2000 motherboards) | Disable 4 Layer |
J200 | FPU clocked at the same speed as the processor. | FPU clocked independently of the processor. (Separate crystal required) |
J301 | 4MB RAM Installed | 2MB RAM Installed |
J303 | Disable Memory | Enable Memory |
J304 | Autoboot Amiga UNIX | Autoboot AmigaOS |
J500 | RAM Timing 80ns | RAM Timing 100ns |
Contributions to this page by:
Dave Haynie, Jan Pedersen, RiWa & Friends, The Man
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