![]() The replacement CPU was sourced from China, and even though the number lasered onto the new CPU read 68040 and not 68 LC040, this laptop was still without a floating point unit. ![]() He pulled the CPU card from the laptop, got out some ChipQuick, and reworked a 180-pin QFP package. A few months ago, was looking for a project and decided replacing the CPU would be a valuable learning experience. ![]() The ‘ LC‘ designation inside the part name says this CPU doesn’t have a floating point unit. The CPU inside these laptops - save for the high-end Japan-only Powerbook 550c - was the 68LC040. This was one of the first laptops that looked like a modern laptop. They had built-in Ethernet, a trackpad instead of a trackball, stereo sound, and a full-size keyboard. Released in 1994, Apple’s Powerbook 500 series of laptop computers were the top of the line. ![]() This is a tale of old CPUs, intensive SMD rework, and things that should work but don’t.
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