BUD JAMISON wrote in a message to CORIDON HENSHAW:
-> They also have one big disadvantage: the parallel port does not carry
-> meaning that it will generate up to sixteen times more interrupts at
-> a given data rate when compared to a serial modem on a 16550.
 BJ> With a parallel port taking in a whole byte at a time, it would do
 BJ> 1/8th as many interrupt requests as a serial port (except for the
 BJ> FIFO buffer being used and set to max, which often causes problems,
 BJ> and then it would be 2 for one).
Not quite right, Bud.  The serial port with no buffering would trigger an 
interrupt when the entire character (usually 8 bits) was received, you would 
not receive an interrupt on every bit as you seem to be thinking.  Using a 
16550 set to trigger when 8 characters were in the buffer for instance, the 
serial port would have 1/8 the number of interrupts compared to using the 
parallel port which had to interrupt on every byte.
Regards,
       David
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