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+* 5.2 A Register Machine Simulator
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+one way to test our machine design is to carry out the state during
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+operations by hand. but that would be silly!! lol. it's a scheme
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+program with 4 interface procedures:
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+
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+ - (make-machine reg-names operations controller)
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+ - (set-register-contents! machine-model reg-name value)
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+ - (get-register-contents machine-model reg-name)
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+ - (start machine-model)
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+
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+** 5.2.1 the machine model
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+make-machine extends the basic machine model with a message passing
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+technique.
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+
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+it has registers holding value as local state. we can get and set.
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+
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+the stack is likewise a procedure with local state. we can push, pop,
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+and initialize to empty.
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+
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+** 5.2.2 the assembler
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+the assembler transforms a series of controller expressions into a
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+corresponding list of machine instructions.
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+
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+: (assemble controller-text machine)
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+
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+** 5.2.3 generating execution procedures for instructions
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+this is some wild shit! true galaxy brain takes.
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+
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+implementing the fundamental instructions of the machine.
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+
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+assign, test, branch, goto,
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+ save, restore, perform,
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+ primitive exp
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+
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+** 5.2.4 monitoring machine performance
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+we can verify not only correctness of a machine design, but also
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+measure its performance
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+
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+cool souped up stack implementation
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