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 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.