Thanks to all who have responded to my email about my hobby circuit simulator, all in a kind manner and instructive. Stephand de Gabrielle (to whom many thanks too, of course) pointed me to section 3.3.4 of SICP, where I learned how to deal with time by means of an agenda. After reading this section of SICP I totally revised my simulator tools such as to use an agenda, but in quite a different way than exposed in SICP. My agenda first changes all signals to be changed and subsequently triggers the gates whose inputs have changed, but every gate only once at a given time. For this reason I don't need a queue. I use a hash that maps times to lists of events. Because every gate is triggered only once at a time, the order in which they are triggered is irrelevant. Furthermore my gates do not schedule signal changes for their outputs if the new inputs do not change the output. In my simulators all gates and all wires are distinct Racket objects, like in a physical circuit all parts are distinct components. This means that every subcircuit, and even every gate, has it's own internal wires and gates. The documentation contains examples of flip-flops and shows how to deal with vibration (such as when powering up a twin-flip-flop (usually called a master-slave-flip-flop, but that's not a happy name) I am aware of the fact that my simulators are very limited. For instance, they change signals instantaneously and at the same time, which in a physical circuit cannot be true, I think. Nevertheless, if you are interested, take a look at joskoot <https://github.com/joskoot>/ circuit-simulation-after-SICP-3.3.4 <https://github.com/joskoot/circuit-simulation-after-SICP-3.3.4>*. *I hold all files in the same directory. To make the documentation I open file circuit-manual-scrbl with DrRacket and press button Scribble HTML. I have tried to make it a package, but the documentation does not come out well. Maybe I need more info in file info.rkt. I don't know. Help is very welcome. Because I have Windows 10, I use the package manager in the file menu of DrRacket. In Windows command line commands are almost impossible. Well, a long story, sorry about that. Thanks very much. Jos
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