A2630 4MB rev 9
Serial: 00604
|
Company
Commodore, USA |
Date
1989 |
Amiga
A2000 |
Interface
CPU slot |
Autoconfig ID
514 / 81 |
processor
- 68030 @ 25 MHz, PGA
- 68882 @ 25 MHz, PGA
- can be upgraded to 50 MHz with CSA’s Rocket Launcher
memory
- 2 or 4 MB RAM on board
- capable of DMA, but does not support burst mode
- 16 or 32 256k×4 page mode ZIPs 80-100 ns
- expansion slot for third party RAM boards
- RAM can be disabled or autoconfigured by setting a jumper
notes
- jumper selects whether autoboot into AmigaDOS or UNIX
- 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
- in 68000 fallback mode the RAM is still available
jumper settings
| J301 – | RAM size: ON – 2 MB, OFF – 4 MB |
| J302 – | B2000: ON – german A2000 |
| J303 – | RAM autoconfig: ON – disabled |
| J304 – | OS: ON – UNIX, OFF – AmigaOS |
-
- rev 6
| J202 – | FPU clock: ON – same as CPU clock |
| J200 – | reserved |
-
- rev 9
| J202 – | FPU clock: 1-2 – same as CPU clock, 2-3 – from oscillator U203 |
installed in: A2500
