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This article reverse-engineers the 69-bit adder at the core of Intel's 8087 floating-point coprocessor from 1980, explaining its architecture and carry-chain techniques.
The article discusses powering up a thyratron tube module from the 1948 IBM 604 Electronic Calculating Punch, detailing the historical context of early electronic computing and the innovation of pluggable modules.
A detailed reverse-engineering analysis of the ALU board from the Mitra 125 MS minicomputer used in Spacelab, exploring its circuit design and historical context.
A guide on using a Raspberry Pi to emulate a dial-up ISP, connecting vintage Macs via Wi-Fi with simulated dial-up speeds.
Jeff Geerling documents the restoration of an Apple Xserve G5 from 2004, including recapping its power supply and installing Mac OS X Server 10.3.
A detailed reverse-engineering analysis of how the Intel 8087 floating-point coprocessor decodes instructions, explaining the interplay between the main CPU and coprocessor, the use of microcode ROM, and the bus interface unit.
A detailed account of repairing a Commodore PET computer from 1977, involving diagnosing multiple bad chips and using adapter boards to replace obsolete ROMs.