On Saturday March 07 1998 at 19:21, Wes Newell wrote to Rick Collins:
 CH>> They also have one big disadvantage: the parallel port does not carry a
 CH>> FIFO, meaning that it will generate up to sixteen times more interrupts
 CH>> at a given data rate when compared to a serial modem on a 16550.
 RC>> Very good point.  I didn't think about that aspect at all. :-)
y
 WN> Not really as each IRQ will fetch 8 bits instead of 1.
Serial port UARTs issue one interrupt per byte recieved.  Not one interrupt 
per bit.
 WN> And I'm not sure that the bytes aren't buffered in the modem and then
 WN> send with X number of bytes per IRQ.
There's no hardware reason you can't do this, but the system load would be a 
problem.
The driver would simply have to disable interrupt generation on the port and 
conduct a polled read until the entire block was finished, then enable 
interrupt generation and pass the data to the rest of the system.
--- GoldED/2 2.50 UNREG
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