Scudrunners

Long before there was 10base2 ethernet,
there was ARCnet with RG62 / 93 Ohm coax!

I wrote a driver in 4000 lines of x86 assembly
for a 16Mhz 286 and got wire rate.  Never been
done before.

[img width=500 height=246]http://www.techsupport.cusa.canon.com/c ... /22127.jpg[/img]

Who needs the terminating resistor!  Just plug
it straight in.

Anyone here old enough to remember 10base5
and those fucking reflections?

Now, people will think this is useless, arcane
knowledge but I was looking at the clock going
to a peripheral on the scope yesterday.  Ok at
1 Mhz, the waveform shape went to pieces at
6 (!) Mhz.  Time for some external terminating
resistors.

Get any TC Inspector to explain this to you:

[url=http://www.ni.com/support/serial/resinfo.htm]http://www.ni.com/support/serial/resinfo.htm[/url]

[quote]Because each differential pair of wires is a transmission line,
you must properly terminate the line to prevent reflections.

A common method of terminating a two-wire multidrop RS-485 network
is to install terminating resistors at each end of the multidrop network.[/quote]

[img]http://www.ni.com/images/support/us/termres.gif[/img]

Now, I'm just a stupid fucking moron, but with
some resistors, 24 Mhz worked just fine.

Colonel,


Try and get a TC guy to explain how to do this: