powerbook 540 and 540c
The powerbook 500 series were the first powerbooks with the power Motorola 68LC040 CPU (simultaneous with the powerbook duo 280) and were upgradeable to the PowerPC architecture via a swap out CPU daughter card (with the PowerPC and 68040 upgrades for sale).
The 500 series were also the first laptop computer to use a trackpad instead of a trackball as a built-in pointing device and the first to have ethernet networking built-in. The model 540 came with a monochrome aktiv matrix and the 540c with a color aktiv matrix display with 16bit stereo sound with stereo speakers, had an expansion bay, PC Card capability, and two battery bays.
The powerbook 500 series were also the last powerbooks with scsi-harddisk.
powerbook 540/c
Minimum OS: 7.1.1
Maximum OS: 8.1
Introduced: May 1994
Terminated: August 1995
Processor
CPU: Motorola MC68LC040
CPU Speed: 33 MHz
FPU: none
Bus Speed: 33 MHz
Register Width: 32-bit
Data Bus Width: 32-bit
Address Bus Width: 32-bit
Level 1 Cache: 4 kB data, 4 kB instruction
ROM: 2 MB
RAM Type: unique
Min RAM Speed: 70 ns
Onboard RAM: 4 MB
RAM slots: 1
Maximum RAM: 36 MB
Expansion Slots: modem, optional type II/III PC Card bay
Video
Screen: 9.5" active-matrix
Max Resolution: 16 bit 640x480
Video Out: 8 bit 832x624 (mirror only)
Storage
Hard Drive: 240-500 MB
Floppy Drive: 1.4 MB SuperDrive
Input/Output
ADB: 2
Serial: 1 Mini DIN-8
SCSI: HDI-30
Audio Out: stereo 16 bit mini
Audio In: stereo 16 bit mini
Speaker: stereo
Microphone: mono