=> R0 = 129
R1 = 0-255 time limit low byte
R2 = &00 - &7F time limit high byte
<= R1 = ASCII code of character read, undefined if not read
R2 = 0 character read
27 escape condition
255 timeout
This call will extract a character from the keyboard buffer/current function key expansion if one is available, else will wait for (R2 * 256 + R1) centiseconds, where the maximum wait is 327.67 seconds, as R2 <= 127. Cursor edit mode will operate if enabled with OS_Byte 4. If an escape condition is detected the application should either acknowledge it with OS_Byte 126 or clear it with OS_Byte 124.
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