<I was joking when I said real-time clock since I thought the PC came with <a real-time clock. Is this not the case? Hmm, come to think of it, I <guess not since I don't see a battery on the MB of this 5150 here. Yep, XT class machines didn't have a TOY CLOCK (TOY is time of year), All the had was a periodic timer interrupt and when you power off so goes the date. Hence the stuff like smart watch. A multi-io card was typically 2 serial, joy stick. either a FDC interface. Most were commonly two serial on one card, a Video and Parallel on another with FDC being stand alone or paired up with the HDC. Clocks were commonly the smart scoket under the bios roms. I have many examples of those here. Allison