Sharp PC-G850 Serial over WiFi Module
YAEP (Yet Another ESP Powered Project): An ESP8266-12 powered WiFi module for the Sharp Pocket Computer via the 11-pin connector connects wireless to PCs for transfer of programs and data. The ESP8266 connects to your home WiFi or acts as an AP for initial configuration. The Serial port of the G850 becomes accessible via TCP on port 23. You can use telnet or netcat (nc) for simple direct transfers to/from the PC or use socat to create a virtual com port. The module supports 9600baud and shortens CTS/RTS and pulls these signals up to +5V, so you need to use XON for flow control. Please note: The G850 uses inverted serial protocol logic levels (i.e. logical “high” is represented by a “low” (0V) TTL level, logical “low” is represented by a 5V TTL level. The ESP8266 uses the SoftSerial library on GPIO 4 and 5, which supports inverted logic levelsRaw TCP is implemented without encryption on port 23. You can connect via telnet to receive or send data or programs but everyone on the same network can read the transferred data in clear textThe module does only support serial port communication (i.e. it does not emulate the CE-126 synchronous communication for print and cassette tape commands)In the TEXT/Sio/Format menu enable 9600 baud, 8N1 and no flow-control. End-of-file “1A” allows the G850 to stop listening when receiving a file. You can still send files without the end-marker, but need to interrupt the “load” command by pressing “ON/BREAK”. The received text will be in the editor. Sleep…
