Also, to learn a bit more about the hardware stack machines, Phil Koopman's book, "Stack Computers: The New Wave" is available online at Phil's site at http://www.cs.cmu.edu/~koopman/stack_computers/
On the aside, the colour itself is arbitrary. If you used the various combinations of normal, italics, bold, underline, you'd have enough to show the different semantic units.
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Also, to learn a bit more about the hardware stack machines, Phil Koopman's book, "Stack Computers: The New Wave" is available online at Phil's site at http://www.cs.cmu.edu/~koopman/stack_computers/
On the aside, the colour itself is arbitrary. If you used the various combinations of normal, italics, bold, underline, you'd have enough to show the different semantic units.