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I wrote Pascal for 8080 in 1976 and Finnish Army even paid some money for it.

I was truly disappointed that Turbo Pascal did not copy my handy PORT-metavariable. You can write & read IO-ports without any extra hässle:

Here is the first function of your example in TP3: procedure DataOut; begin while (Port[$f5] and 1) = 0 do; port[$f4] := Data; end,

Must be later improvement, because I whined about it in Usenet.

Originally you had to write inline assembly.