low-level assembler on minicomputers/mainframes or comparable embedded environments with interrupt-driven I/O
real-time tasking, priority scheduling, determinism, latency budgets, watchdog/error handling, and I/O scanning in process control environments
safety-critical and safety-related software quality assurance lifecycle
Varian 72 assembly, PDP-11 (MACRO-11), PDP-8, or comparable mainframe/minicomputer assembler (e.g., IMD/IBM-1800 class)
reverse engineer legacy assembly and apply “surgical” patches to correct defects or add minor capabilities without destabilizing the existing executive/user programs
read, reason about, and patch existing assembly with tight timing constraints and interrupt-driven I/O
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