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FFE1: scan the stop key
Used by the routines at A82C, F4A5, F5ED, F8D0 and FE47.
if the STOP key on the keyboard is pressed when this routine is called the Z flag will be set. All other flags remain unchanged. If the STOP key is not pressed then the accumulator will contain a byte representing the last row of the keyboard scan. The user can also check for certain other keys this way.
FFE1 6C 28 03 JMP ($0328) do scan stop key
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