Help in I/O timing

[Greg_Baber]

Hello,
	I'm running SCO Xenix 2.3.1 on a AST Premium 386. I have installed
	an Intelliport AT-16 sixteen port I/O card. I'd like to be able to
	do some timing of the I/O routines. That is, how long does it take
	for a byte to go from the card input to a program running in memory?
	I assume that I'll be running a minimal system (all extra gettys
	turned off, etc.) so that OS overhead is reduced. I'm concerned
	about how long the character spends in the driver code. If the
	delay in the driver is long, throughput may be high, but the delay
	time could be prohibitive for my use. Any ideas???    gregb
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