Image Credit:  Apple, Inc.

Introduced: May 16, 1994
Terminated: June 10, 1995

Logic Board
Processor:   68LC040
Processor Speed:   25 MHz
  • The clock input runs at 50 MHz; however, the processor itself is clocked at 25 MHz, so technically it is only a 25 MHz processor.
PMMU:   Integrated
FPU:   none
Bus Speed:   25 MHz
Data Path:   32-bit
ROM Size:   2 MB
Level 1 Cache:   8K
Level 2 Cache:   none
Expansion Slots:   Modem
Battery:   PB500, NiMH

RAM Type:   PB5xx
RAM Slots:   1
Min - Max RAM:   4 MB - 36 MB
Minimum RAM Speed:   70 ns
Install in groups of:   1
RAM Sizes:   4, 8, 12, 20, 32 MB
Onboard RAM:   4 MB

Image Credit:  Macworld, July 1994

ADB:   1
USB:   none
FireWire:   none
Video:   mini-15
Floppy:   none
SCSI:   HDI-30
Geoports:   none
Ethernet:   AAUI-15
AirPort Ready:   No
Mic Type:   Line in
Other ports:   Printer, speaker

Image Credit:  Apple, Inc.

Image Credit:  Apple, Inc.

(Click) 1994 Apple Computer
"PowerBook 500 In Depth" Magazine Ad

  • 9.5" Grayscale FSTN passive-matrix (4-bit, 16 grays) LCD
Resolution (built-in LCD):
  • 640 x 480, 4-bit
Resolution External Only (512K VRAM):
  • 512 x 384, 8-bit
  • 640 x 480, 8-bit
  • 800 x 600, 8-bit
  • 832 x 624, 8-bit

Standard CD-ROM:   none
Internal Hard Drive:   SCSI (160 - 240 MB)
Floppy Disk Drive:   1.44 MB manual

Operating System
Addressing Modes:   32-bit
Original OS:   7.1.1
Original Enabler:   PowerBook 500 Series Enabler
AppleTalk Version:   57.0.4

Compatible MacOS:

(Macworld, July 94) The 500-series PowerBooks offered a full size keyboard for typing. There was also a row of function keys as well as escape and power-on keys along the top row. Missing were page up and page down keys.

Codename:   BlackBird LC
Form Factor:   PowerBook 520
Dimensions (Inches):   2.3 H x 11.5 W x 9.7 D
Average Weight (lbs):   6.3
Gestalt ID:   72
Original Price:   $2250, $2400 US

(Click) Apple Dealer Spec Sheets

(Click) MacUser, July 1994, 500-Series Modular Design

(Click) Macworld, July 1994, The Pull-Apart PowerBook

Manuals at

PowerBook 520

PowerBook PowerPC Upgrade Guide

PowerBook 520 Getting Started

PowerBook 520 User's Guide

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