Comment by _yosefk

At my end, I wonder where the author ever saw deterministic computer systems. In my experience, you have to work really, really hard to get even a system computing outputs from inputs without processing any external events in-between to produce deterministic results, with things like floating point hardware and software and parallelism APIs, not to mention your own bugs, working overtime against you - to say nothing of faulty DRAMs and other such delightful phenomena.