• Connect DOS laptop to the Internet by becoming own SLIP ISP
• Slip to wifi router using esp8266 microcontroller
• Heyes type of modem

The Serial WIFI Modem Emulator is a RS232 DB9 connection which provides a bridge to the internet over WIFI. This device does not show up like a wifi network card on the old device. Rather it shows up as a Hayes compatible dial up modem. Instead of dialing phone numbers to connect to remote computers, it connects to remote computers via telnet.

• ESP8266/ESP32/Arduino custom modem<->internet simulator with lots of features
• Raspberry pi zero w serial modem prototype
• The PiModem Project