A year ago I adopted my friend's AIM-65 (along with the complete set of papers) he used in college many years ago. It's in excellent condition, except for a small crack on the red plastic over the LED display. It is completely function, but I can't figure out how to program it. It does not have an assembler ROM (I can't find the correct ROM chip in order to burn it), and I don't know how to execute the machine code I write using the manual memory editing command. It's such a strange system, that some help would be appreciate.

Thanks!