We have a Pager that works, but no pager service is available. People have moved on to phones.
Amateur radio receivers

Features
- Incoming SMS
- Outgoing Landline
Electronic Engineering Technologies
USB to RS232 converter
this may work:
http://www.pccompci.com/usb-converter/usb-converter.html
just use the lines going to rxd and txd os rs232(serial)
to your 80535 rxd txd serial port lines.