I've ported the Apple-1 built-in monitor program: WozMon.gcl

The original is 254 bytes, my version is $254 bytes . About half of that is for terminal output (character printing). The Apple-1 had dedicated hardware for that... With this, all original Apple-1 firmware has been ported to the Gigatron :-)

Now you can inspect memory locations, write to them and execute code.

Tutorials for the original WozMon, such as this nice one, are applicable as I tried to deviate as little as possible from the original: the differences are essentially cosmetic or slightly improved usability. The Gigatron-specific differences are:

•     Welcome message is "*** WozMon" instead of error prompt ('\')
•     Can use lowercase as well as uppercase for hex letters
•     Delete shows effect on screen, no need for '_' (RUBOUT)
•     Always print address at start of line in block examine mode
•     Input buffer has the same size as screen width
•     Executed code can go back to monitor with RET instruction ($ff)
•     Faster screen update, and cursor symbol instead of '@'
•     A bit more careful with empty lines