serial_cable - vc64web/virtualc64web GitHub Wiki
vc64web features a virtual serial RS232 cabel which is connected with the user port of the emulated c64 ... on the host side this cable is connected to javascript
to configure the speed use
wasm_configure('OPT_SER_SPEED',600);
To send bytes via the serial cable into the c64 use:
wasm_write_string_to_ser('hello commodore');
the outgoing serial byte/textbuffer from the c64 is copied into a javascript variable
rs232_message