6502 tracer - program analysis software for Junior Computer and other 6502-based systems

6502 tracer elektor february 1984 J. Ruppert Being able to see what a processor does as it runs a machine code program is a great aid in understanding the program, in fault finding, in testing, and in fact in everything a programmer does when developing some new software. The program given here makes it possible to do this automatically. At each step the contents of the CPU registers, the stack and its pointer are displayed for the corresponding instruction. 6502 tracer program analysis software for Junior Computer and other 6502-based systems Table 1. 6502 TRACER is an analysis program that must run in RAM, but there is nothing to stop you from storing it in some other kind of memory and simply transferring it to RAM to run it. JUNIOR This program is aimed not only at users of the Junior Computer but also at the owners of any 6502-based system. It oc- cupies about "/2 K of memory and uses two bytes in page zero. Very few changes are needed to adapt it to a system other than the J...