After determining the addresses of suitable keyboard input and screen output routines, I very quickly got it up and running. Most of the work to fully port it was to adapt the output to the smaller screen width (24 characters) of the Superboard. I also had to disable some features that did not apply. It is now fully working and is quite useful, particularly as the built-in OSI machine language monitor is very primitive.
Years ago, when I had an original Superboard II, I wrote some machine language programs by hand assembling them and entering the hex codes into the monitor. I very quickly wrote a disassembler in BASIC in order to help verify and debug my programs.
JMON is cross-compiled on a desktop computer, and both the Apple Replica 1 and Superboard /// versions build from the same source code using ifdefs for conditional code.
Below are some representative screens showing some of the commands.
|Memory Dump command|
|Changing registers and single stepping|