The Macintosh PowerBook® 500 Series computers are a family of portable notebook computers. The PowerBook 500 Series are full-function desktop-replacement portable computers with a number of standard notebook computer features. They use either a Motorola - MC68LC040 or a MC68040 processor as the standard processor. These standard processors are upgradable to an optional Motorola - MPC603e PowerPC® processor through the exchange of the standard processor daughter card with the PowerPC® PowerBook® Processor Card Upgrade processor daughter card.
Performed design and development for portions of the power supply and power control circuits. Validated operation of the Motorola-manufactured Apple-proprietary M68HC05 system control microcontroller.
Performed design and development for portions of the audio input and output circuits. This included the microphone amplifier and the loudspeaker/headphone amplifier, along with associated control circuitry.
Performed design and development for portions of the PC card interface expansion module. Designed part of the Apple-proprietary PC card interface ASIC.
"The PowerBook 540/540c," G. Sanford, www.apple-history.com, 2002.
"The PowerBook 540c," D. Knight, Low End Mac, 2002.
"PowerBook 540c Macintosh Computer (review)," G. Gruman, Macworld, October 1994.
"PowerBook 520 and 520c and PowerBook 540 and 540c Computers Developer Note," A. Watson, Apple Computer, 1994.
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Gary Embler (remove the "-nospam-" in the address to email)
October 14, 2002