Macintosh PowerBook 520/520c
Codename: "Blackbird LC"
Introduced: May 1994
Discontinued: June 1995 (520)/September 1995 (520c)
Processor: Motorola 68LC040
Processor Speed: 25 MHz
Cache: 8k L1
Data Path: 32 bit
System Bus: 25 MHz
Hard Drive Size: 160 - 240 MB
Media: 1.44 MB Floppy
Weight and Dimensions: 6.3 lbs. (520)/6.4 lbs. (520c), 2.3" H x 11.5" W x 9.7" D
Original Mac OS: Mac OS 7.1.1
Maximum Mac OS: Mac OS 8.1
Machine ID: 72
Motherboard RAM: 4 MB
Maximum RAM: 36 MB
Number of Sockets: 1 - PB 5xx
Minimum RAM Speed: 70 ns
Graphics Card: None
Video Memory: 512k
Built-in Display: 9.5" 4 bit 640x480 (520) or 9.5" LCD 8 bit 640x480 (520c)
Display Connection: Mini-15
Slots: Modem, Optional Type II/III PC Card Bay
Hard Drive Bus: SCSI
Expansion Bays: PowerBook Expansion Bay (90-pin) PDS
Modem: None
Airport: None
Bluetooth: None
PRAM: n/a
Power: 40 Watts
Battery: NiMH
ADB: 1
Serial: 1
SCSI: HDI-30
USB: None
FireWire: None
Ethernet: AAUI-15
Infrared: None
Sound In: Stereo 16 bit (built in mono mic)
Sound Out: Stereo 16 bit (built-in speakers)
History: Introduced in May 1994, the PowerBook 520 was the first PowerBook with '040 power. A track pad replaced the rolling ball in older PowerBooks, and the 520 had a built-in microphone and stereo speaker. The 520 was priced at $2,270 U.S. with an passive-matrix 4-bit grayscale screen, and the 520c, with a dual-scan 256-color screen (the 520c was the first PowerBook to include one), cost $2,900 U.S.

