power book 520
The PowerBook 520 was - along with the PowerBook 520c, PowerBook 540, PowerBook 540c and PowerBook 550c notebooks - launched in the spring of 1994. It featured a 9,5-inch screen, a 25 MHz Motorola 68LC040 processor, 4 or 12 MB of RAM and a hard drive with with a capacity of 160 or 240 MB. Like the other models of the PowerBook 500 series, it was the first laptop to feature the then-revolutionary input device called a trackpad (instead of a trackball), and it also boasted (like its siblings) 16-bit stereo sound with stereo speakers, the ability to upgrade to PowerPC architecture (thanks to replaceable daughter a processor card), a PC Card (PCMCIA) interface, an expansion box, an Ethernet port, or an "intelligent" nickel-metal hydride battery ("intelligent" here was more precisely a circuit system used to monitor the health of the battery).
Technical Specifications
| Performance date | May 1994 | |
| Capacity | HDD with a capacity of 160 and 240 MB | |
| RAM | 4 or 12 MB (expandable to 36 MB) | |
| Dimensions | 5,8 x 29,2 x 24,6 cm | |
| Weight | 2,9 kg | |
| Display | 9,5-inch FSTN LCD with 16 shades of gray and passive matrix, 640 x 480 resolution | |
| Chip | Motorola 68LC040 | |
| Connectivity | ADB port, Serial port, SCSI port, Video connector Mini-15, Ethernet port (AAUI-15) | |
| Battery | nickel-metal hydride with a duration of 3-4 hours (thanks to the expansion frame, it was possible to add another battery to the notebook, with which the "plus or minus" duration was doubled) |
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