Laptop models

• A-Test board (bare motherboards)
• B1 machines (identifiable by a B1-TEST SAMPLE label under the battery)
• B2-1 machines (identifiable by B2-TEST SAMPLE and B2-1 through B2-16 labels under the battery)
• B2-2 machines (identifiable by B2-7-ext label under the battery)
• B3 machines (colored cover-plate; identifiable by a B3-TEST SAMPLE label under the battery)
• B4 machines (textured handle; colored cover-plate; identifiable by a B4-TEST SAMPLE and B4-1 through B4-16 labels under the battery)
• Preproduction (C machines) (fully textured; identifiable by a C-TEST SAMPLE and C-1 through C-6 labels under the battery)

(See the Laptop Development Schedule for a more detailed description of the various development systems.)