Simple ROM OS like program.

This project is explicitly for 68HC811E2 device. The code of the program is quite big and that is the only device I'm aware of that has sufficient build in programmable memory. The title is a bit misleading, this is not an OS by any means - the program has simple UI interface, but does not provide any resource management features.  You may look at it as a boot loader with UI.

Features:

• command line UI - trough the RS232 interface.
• can load a S19 format data
• can verify S19 format data
• can DUMP any portion of the memory
• uses only build-in resources, so it is independent of the board (Well it requires an RS232 interface).

Cons:

• the image is almost 1.7k, which does not fit the build in EEPROM of most of the 68HC11 family members.
• I did not have time to refine the command line processing, so there are some quirks
• the code is by no means professional - it does work, but is not very optimized.

Well it is also a great way to learn how to do more complex 68HC11 programming. I'll show you how to "expose" the OS services to other programs.

To be continued ...

Next: How to program the OS into the build-in EEPROM.

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