The ‘Simple’ Wifi Modem is a device that connects a computer with an RS232 serial port to a telnet BBS. It does not use an analog phone line but internet through a wifi connection. It behaves like a Hayes dial-up modem, and it is designed and built for old computers; I use it with my first computer ever (still working!): a Sinclair Zx Spectrum and, being myself a retro-collector, also with a lot of other different machines.

My idea was to create a device with the same look and feel of a real modem: a lot of big, flashing, red LEDs and only a few SMD components.

Main characteristics:

• Emulation of a Hayes modem

• DB25 serial connector (optional external port)

• Uses 5v micro USB cable port for power (USB cable not included)

• LEDs for status, as in old modems

• Hardware flow control (partial implementation)

Its design is open source and you can find all the schematics and full instructions in the Source Code link below.

The software installed is a fork of Zimodem written by Bo Zimmerman.

It has just been modified to support this device.