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.

The 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).

Specs (via Low End Mac)

• Cpu: 25 MHz 68030
• Fpu: none
• Performance: 3.8 (relative to SE)
• Ram: 2 MB, expandable to 8 MB using a special 100ns pseudostatic RAM card
• Rom: 1 MB
• Hard Drive: 80 or 120 MB
• Display: 9.8″ 1-bit 640 x 400 77 ppi passive matrix
• Gestalt Id: 54
• Code Name: Pike’s Peak
• Adb Ports: 1 port for keyboard and mouse
• Weight: 6.8 pounds
• Serial Ports: 2 DIN-8 RS-422 ports on back of computer
• Scsi Ports: HDI30 connector on back of computer
• Power Supply: M5651 – 19W, 2 amps
• See: Online resources and links for the PowerBook 145b