This comprehensive guide explains how to upgrade the memory on an IBM PC XT motherboard, specifically focusing on expanding it to a maximum of 1MB. It covers various aspects of the process, including introducing the upgrade project, listing the required components, explaining the concept of high memory in vintage computing, providing step-by-step installation instructions, detailing the replacement of the IC U44 with a GAL chip, and exploring different memory configurations and SW2 settings. The guide also includes essential circuit details and considerations for clones and XT-compatible systems.
This teardown is about the Mobile Ident III, a handheld fingerprint identification device from 3M Cogent. With forensic-quality fingerprints, high-resolution portraits, and multiple wireless interfaces, it was developed for military, law enforcement, and civil government applications. It stores up to 300,000 fingerprint templates, and submits NIST files to back-end matching systems for easy identification.
PIER™ is a rugged handheld iris recognition device with high accuracy and military-grade security. Using advanced lenses and the Daugman algorithm, it’s portable and runs on Phar Lap ETS. In this project I will do a complete teardown of this device.
I was looking for spare parts for my airline trolley and ended up constructing them myself. This is about the ATLAS and KSSU standards, and how an adapter can combine those standards.