PowerBook Duo 280c

Apple upped the ante by moving from the 68030 to the 68LC040 processor on the Duo 280 and 280c in May 1994. (The 68LC040 is a low power version of the 68040 with the internal FPU disabled.) Other than the CPU, this is essentially a Duo 270c.

PowerBook Duo 280cLike the 270c, the 280c supports 16-bit video if you select the 640 x 400 pixel mode under Options in the Monitors control panel.


  • introduced 1994.05.16 at $3,750; discontinued 1996.01.27
  • supports System 7.1 to Mac OS 8.1
  • CPU: 33 MHz 68LC040
  • RAM: 4 MB, expandable to 40 MB using a single Duo RAM card
  • ROM: 1 MB
  • display: 8.4″ 640 x 480 @ 8-bits, 640 x 400 @ 16-bits, 95 ppi active matrix
  • ADB port: only with dock
  • SCSI port: only with dock
  • serial ports: 1 DIN-8 RS-422 port on back of computer
  • proprietary modem slot
  • Gestalt ID: 103
  • Size (HxWxD): 1.5″ x 10.9″ x 8.5″
  • Weight: 4.8 pounds
  • power supply: M2693


Online Resources


  • Modem port limited to 57.6 kbps (printer port may be faster); use of a 56k modem on the modem port may limit throughput. See 56k modem page.

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