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It turns out that the information about system variables were at the end of the disassembly document. This is an excerpt from it: $272,$273 Keyboard timer. $274,$275 Cursor timer. $276,$277 Spare counter — also used by WAIT (and printer in V1.0). And the argument for the WAIT command is a multiple of 10 ms, so WAIT 100 waits for 1 second. So the ...


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