PowerBook 140

The PowerBook 140 had a physically larger passive-matrix screen than the PowerBook 100 (although it displayed the same 640 x 400 pixels), a more efficient CPU, and a 2-hour NiCad battery (the same one used on all PowerBook models from the 140 to the 180). It was replaced by the 25 MHz PowerBook 145 in August 1992.

PowerBook 100 SeriesAs with all early PowerBooks, when buying one be sure it has all the memory you need (new PowerBook RAM is very difficult to locate, especially at reasonable prices).

The PB 140 has an 8 MB memory ceiling, although you can go beyond that by using Virtual Memory (slow and free) or RAM Doubler (faster, not free, and discontinued). A third option is RAM Charger 8.1, which offers better memory management than the Mac OS.


  • introduced 1991.10.21 at $3,000; discontinued 1992.08.03
  • Code names: Leary, Tim LC

Mac OS

  • requires System 7.0.1 to 7.6.1

Core System

  • CPU: 16 MHz 68030
  • FPU: none
  • ROM: 1 MB
  • RAM: 2 MB RAM, expandable to 8 MB using a special 100ns pseudostatic RAM card


  • 2.8, relative to SE
  • 3.9 MIPS
  • 4.10, Speedometer 3.06
  • 0.26, Speedometer 4


  • display: 9.8″ 1-bit 640 x 400 77 ppi passive matrix


  • Hard drive: 20, 40, or 80 MB
  • floppy drive: 1.4 MB double-sided


  • ADB ports: 1 port for keyboard and mouse
  • serial ports: 2 DIN-8 RS-422 ports on back of computer
  • SCSI ports: HDI30 connector on back of computer
  • proprietary modem slot


  • size (HxWxD):
  • Weight: 6.8 pounds
  • power supply: M5140 – 15W, 2 amps

Online Resources

Online Profiles


  • The PowerBook 140 does not support SCSI Disk Mode.
  • Apple Computer considers this computer obsolete as of 2001.07.16 in the United States and 2001.07.23 in Canada. Service parts and documentation are no longer available from Apple.
  • The 100-series and 500-series PowerBooks do not provide SCSI termination power, depending on external SCSI devices to provide it. For more details, see SCSI Termination Power.
  • Macs with black-and-white only displays (1-bit, no grays) may find Netscape Navigator 3 makes it impossible to view some pages and sites. The workaround is to use Navigator 2.
  • 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.
  • Apple has discontinued support and parts orders for this model. You may be able to find dealers with parts inventory either locally or on our parts and service list.

Short link: http://goo.gl/eHU2r5

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