PowerBook 145b

The PowerBook 145b replaced the PowerBook 145. It offered the same performance at a lower price. It was replaced by the 33 MHz PowerBook 150 in mid 1994.

PowerBook 100 SeriesThe PB 145 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). Another option is RAM Charger 8.1, which offers better memory management than the Mac OS.

As with all early PowerBooks, when buying used be sure it has all the memory you need (new PB RAM is getting more difficult to locate, especially at reasonable prices).


  • Code name: Pike’s Peak
  • introduced 1993.06.07 at $1,300; discontinued 1994.07.18
  • requires System 7.0.1 to 7.6.1
  • CPU: 25 MHz 68030
  • FPU: none
  • Performance: 3.8 (relative to SE)
  • ROM: 1 MB
  • RAM: 2 MB, expandable to 8 MB using a special 100ns pseudostatic RAM card
  • display: 9.8″ 1-bit 640 x 400 77 ppi passive matrix
  • 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
  • Hard drive: 80 or 120 MB
  • proprietary modem slot
  • Gestalt ID: 54
  • Size (HxWxD): 2.25″ x 11.25″ x 9.3″
  • Weight: 6.8 pounds
  • power supply: M5651 – 19W, 2 amps

Online Resources


  • The PowerBook 145b 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. As of that date, service parts and documentation are longer be 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.
  • Serial port limited to 57.6 kbps; throughput using a 56k modem may be limited. 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.

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