6502.org

I wish you all a happy new year, especially with good health!

I just released bootmon65 on github (https://github.com/tius/bootmon65). It's a small bootmonitor designed for a minimal 65c02 system (tiny65). However, some parts of it might be useful for other systems as well.

• - Fast software-only serial interface (57600 baud @ 1 MHz CPU clock) with full XMODEM support.
  - Minimal SD card loader for FAT32 formatted SDHC cards (up to 6 KByte/s @ 1 MHz CPU clock).
  - Simple monitor program with the usual commands for memory and register access.

The hardware requirements for the basic functionality are minimal. Only a few free I/O lines are needed for the serial interface and the optional SD card interface.

A lot of know-how gathered on 6502.org has been incorporated into the code. Many thanks to all those who have contributed and continue to contribute! Bug reports, comments and improvements are very welcome.

Excellent! Thanks for sharing. I do like bit banged serial.

Thank you very much @BigEd!

I would like to emphasize at this point that some of the optimizations there are based on the ideas of other developers. I'm sorry if, after many years, I sometimes can't remember where I first saw one trick or another.