Genuine Amiga Kickstart 3.1 ROM chips for either A500/A500plus/A600 or A1200 (please select)
 
Includes:   
- A500/A500plus/A600 version : Kickstart 3.1 ROM
- A1200 version : Contains v40.68 Kickstart 3.1 ROM chips. (2 chips)
 
Use Workbench 3.1 on your Amiga 600 or on Amiga 1200, you can use AmigaOS 3.9, AmigaOS 3.5 or Workbench 3.1.