Clock program for COSMAC Elf microcomputer with PIXIE graphics

[Eric Smith]

I've written a clock program to run on an unexpanded Elf with PIXIE
graphics. It proved to be quite a challenge to fit it into 256 bytes, but
I've now got it working, with two bytes of RAM to spare. There are 12-hour
and 24-hour versions. I've released it under the GPL 3.0 license.

The source code is in a github repository:
    https://github.com/brouhaha/elf-clock

A text file containing instructions and hexadecimal object code is at:

https://github.com/brouhaha/elf-clock/releases/download/v0.1/elf-clock-v0.1.txt