The BIOS shouldn't need to be flashed unless the board has been sitting on a shelf for five years. If that's the case, someone sold you a technological Edsel. LOL And the 'BIOS clock' is the real-time clock onboard. As long as the battery is good, set it and forget it. If you want to talk about a Jurassic computer, my sister-in-law dropped off the PC she uses at the church she keeps the books for and designs the Sunday service programs on, so my wife could replace the gimpy CD-ROM. She put that fossil on my workbench, booted it up, and it had a whopping 32 MB of RAM. We tithed a spare CD-ROM drive and an extra 32 MB we dug out of my RAM jar. Working 72-pin SIMMS are a rare commodity nowadays. LOL
