Bandwidth of Parallel port.

[Anthony Q. Bachler]

Does someone know what the maximum throughput of the PC parallel port is in
bytes/sec? Someone sent me the spec for the port, but it looks like the
timings for input and output are different.
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[CyberCir]

I remember a number around 150k bytes/sec.

Damian Bonicatto
PTM
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[Mike McCarty]

In article <5ltkm0$4...@news.sockets.net>,
Anthony Q. Bachler <cwhi...@sockets.net> wrote:
)Does someone know what the maximum throughput of the PC parallel port is in
)bytes/sec? Someone sent me the spec for the port, but it looks like the
)timings for input and output are different.
)--

There is no "spec" for that. I do, however, have some timings. I copied
files containing exactly 10 million (that's 10^7) bytes across parallel
links managed by INTERLNK/INTERSVR. Here's what I got:

Operation How Time
--------- --- ----
copy local 17 s
copy remote parallel 325 s
xcopy local 16 s
xcopy remote parallel 324 s
copy remote serial 1755 s
xcopy remote serial 1756 s

The serial links were 115200 baud links. The actual transfer time was
1755-17 = 1738 seconds which works out to 115075 bits per second. That's
0.1% less than the theoretical maximum, which I attribute to the
protocol used. I take this to mean that the protocol overhead is
negligible in further computations.

For the parallel connectio, we get 325-17 = 308 seconds or 64935
bytes/second.

The host was a 160 MHz AMD 586 and the client was a 40 MHz 386SX.

Mike
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