Repairing a Very Slow FIC 486-VC-HD Motherboard

Today I repair and test a budget model FIC 486-VC-HD motherboard. This board refused to boot due to a dead RTC module, but also had terrible memory latency. Join me today as I get this board repaired and dig into a surprising caching problem that impacts many 486 boards from the early 90s. DS12887A+ RTC modules from DigiKey: https://www.digikey.ca/en/products/detail/analog-devices-inc-maxim-integrated/DS12887A/956873 24-pin DIP sockets: https://www.digikey.ca/en/products/detail/adam-tech/ICS-624-T/9832867 Necroware’s nwX287 modules: https://github.com/necroware/nwX287 If you'd like to support the channel, you can check out my Patreon page. My Patreon supporters get early access to my videos, exclusive behind the scenes content, previews and more. My Patreon Page: https://www.patreon.com/vswitchzero My Blog: https://vswitchzero.com/ Bluesky: https://bsky.app/profile/vswitchzero.com Mastodon: https://bitbang.social/@vswitchzero 00:00 Introduction 00:34 It’s Broken 01:47 RTC Repl