link: https://www.ebay.com/itm/273272888023

This is the "ISP end" modem from my Dial-Up at Home With a Line Simulator thread. It's obviously fully functional I tested it both as the called and originating modem. It's in a Microcom box, but it's not the right box for this model -- likely the modem that replaced this one came in it! This modem will work with basically anything that has a RS-232 serial port. It's currently set for Hayes mode (AT command set) and auto-answer after one ring.