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
  • DKB 2632 accepts 112 MB of SIMMs
  • Access 32 accepts 32 MB of ZIPs
• 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

manuals

installed in: A2500

https://www.intexsound.de/Commodore-Museum-Mannheim/hegatad/uploads/2024/04/Amiga500glossy1989-12.pdf