Here is a little DEMO version of MON86.
It runs under DOSBOX which you can get from my site.

It's about 1k larger than the actual monitor because it has some
protection built in to make it hard to use it without buying the
source, but it will let you see the commands etc.

The 'Q' command has been disabled and just restarts MOB86. You will
need to exit DOSBOX to end it.

Dave Dunfield   -   https://dunfield.themindfactory.com
       Download and see my product CATALOG.
