The ‘Simple’ Wifi Modem v2 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

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

• LEDs for status, as in old modems

• Hardware flow control

In revision 2 hardware flow control is fully implemented. The circuit board has been optimized and reorganized.

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.