My first PC was an AT&T branded unit. It came with a genuine IBM keyboard, the 5 pin "microphone" style connector of course. Weighed a ton and was built of solid metal except for the top cover and keys. You could bash in someone's skull with it, then go right back to work using it. Outlasted the PC, used it on the replacement then they went to the more modern PS2 connectors and I got an adapter for it. Finally started glitching after many years and I took it apart to see if it was something fixable. I discovered why it was so heavy, it had lead weights screwed to the baseplate! They definitely don't make 'em like that anymore!