0:47Ch                   Time-Out Values for RS-232 Communications Lines
 
 Length: 4 bytes
 
    These bytes are used to test when the RS-232 Communications lines will
    time-out.
 
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    These bytes are used to test when the RS-232 Communications lines will
    time-out. These values are usually 01h. On the PC and XT, these values
    tend to represent the number of seconds before a time-out. On other
    machines, such as the AT, these values are still 01h, but in the time-
    out test, these values are multiplied by 4 to compensate for the
    increased speed of the AT. However, the actual number of seconds
    before a time-out situation is about twice the time-out values stored
    here. In any case, these values should NOT be looked on as the number
    of seconds before a time-out, but instead should represent the amount
    of time needed to detect a time-out situation.
 
               0:47Ch - Serial Port #1 Time-out Value (COM1)
               0:47Dh - Serial Port #2 Time-out Value (COM2)
               0:47Eh - Serial Port #3 Time-out Value (COM3)
               0:47Fh - Serial Port #4 Time-out Value (COM4)