Adafruit CP2105 Friend - USB to Dual UART Serial Converters

On our first Pentium 120 tower (purchased at PCs for Everyone on Thorndike st in Cambridge Mass) came with two DE-9 serial ports on the back: COM1 and COM2. Perfect for connecting a mouse and maybe a modem. Nowadays, long gone are the days of parallel ports and serial ports. Now the USB port reigns supreme! But USB is hard, and you just want to transfer your every-day serial data from two serial ports to a single USB port without the complexity of a hub. What now? Enter the Adafruit CP2105 Friend!