Enable Serial Boot Mode

Enabling the serial bootstrap mode is a somewhat tricky process. After reset button is released, the CF disk needs about half second to initialize itself to be ready. If the ROM software detected a serial character during the wait for CF to be ready, it will switch to the serial bootstrap mode. To enable the serial bootstrap mode:

  • Set up the serial port to 115200 N-8-1 and be ready to send a character to CRC65,
  • Press and release the RESET button. As soon as the button is released, press the keyboard once to send a character to CRC65,
  • CRC65 is now in serial bootstrap mode, but there are no visual indication at all,
  • Send the Tinyload as binary file (In TeraTerm, check the “Binary” box), the console will respond with

L- >


CRC65 is now ready to accept one or more Intel Hex files. Program execution can be initiated by type
Gxxxx ←please note 'G' must be in upper case, and address 'xxxx' is not displayed.

builderpages/plasmo/crc65/enable_serial_boot.txt · Last modified: 2021/01/29 19:55 by plasmo
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