The PowerBook Duo 280/280c-series has a single motherboard memory expansion slot addressed along a 32-bit memory bus. These computers require unique 70ns Duo Memory Expansion Cards in either 4MB, 8MB, 12MB, 20MB or 36MB capacities. The Duo 200-series shipped in no fewer than six distinct configurations, with four different motherboard revisions:
- Logic Board, Duo 210, 25MHz 68030, part number 661-1653
- Logic Board, Duo 230/250, 33MHz 68030, part number 661-1672
- Logic Board, Duo 270c, 33MHz 68030 / 68882 coprocessor, part number 661-1717
- Logic Board, Duo 280/280c, 33MHz 68LC040, part number 661-0051
The Duo 280/280c configurations shipped with 4MB RAM soldered to the logic board. Although all Duo 200-series motherboard revisions accept the same RAM as the PowerBook Duo 2000-series, please note which PowerBook you are ordering for in the Comments field of the order form when ordering upgrade modules.
Including soldered main motherboard RAM, the addition of a single 4MB, 8MB, 12MB, 20MB or 36MB expansion module yields memory configurations of 8MB, 12MB, 16MB, 24MB and 40MB. The maximum amount of RAM the Duo 280/280c can address is 40MB, through the installation of third-party 36MB expansion modules.
Alone among the Duo 200-series, the Duo 280c shipped with a Motorola 68LC040 microprocessor clocked at 33MHz. Despite the fact that the 68LC040 lacked an FPU, the Duo 280c was nonetheless for a time the fastest Mac PowerBook ever manufactured, also utilizing the excellent color LCD display which debuted on the Duo 270c. Due to the disappointing performance of the final PowerBook Duo, the PowerPC 603e-equipped Duo 2300c, many Duo purists still venerate the Duo 280c as the best Duo ever made.
The Duo-series in entirety supports SCSI Disk Mode.
Specifications Logic Board RAM 4MB. Supported Modules 4MB, 8MB, 12MB, 20MB, 36MB. Number Expansion Slots One (1). Soldered VRAM None. Number VRAM Slots None. L2 Cache Supported None. Module Type 70ns PBDuo 200-series RAM Expansion Card.
While some of the products mentioned on this page may no longer be available, the information about these products remains available to those who may need it.
when ordering upgrade modules from MacGurus.