[analog31]

On my first PC, the serial port was an add-on board, and I wire-wrapped one to save a few bucks. My hands were trembling as I powered it up. I don't remember the chip either. Next time I "wired" a UART, it was built into a microcontroller. I also bit-banged one for the PIC16C84 MCU.

But asynchronous serial isn't completely obsolete yet. It just has more protocol layers on top of the physical layers.

[WalterBright]

I had a design notebook for the project, which included all the datasheets for the various chips. Dammed if I know what happened to it.