When using a real CTC, that is a wire cable between two separate
computers, (I haven't seen one of those in years either but they do
really exist) it is necessary to reverse the order on one. One machine
read=0A00 write=0A01 the other read=0A01 write=0A00. One machine has to
read what the other is writing. I learned this in 1968 when I plugged
the tape drive cable from one CDC G-15 into another CDC G-15 instead of
a tape drive. If I issued a write tape from one machine and a read tape
on the other it would copy a buffer of data from one machines memory
into the other.
Ivan Warren wrote:
Adam Thornton wrote:
I'm going to be devil's advocate here:
*I* always use the even address as the bottom one of the pair.
Is there anything mandating that that has to be the case?
Adam
Oh.. You're lacking imagination ! You could push that one just a tad
further !
1) Use non consecutive pairs (Read=0a00, Write=0a10)
2) Reverse the order (Read=0a01, Write=0a00)
3) Set the pair on different channels (Read=0a00, Write=0b00)
4) Set the pair on different LCSS (Read=0:0a00, Write=1:0a00)
5) What you said : start with even (Read=0a01, Write=0a02)
6) Really wicked ! All of the above ! (Read=1:0b11, Write = 0:0a00)
But eventually, to make it work in a hot plug environment, you're going
to have to set some rules if you want the hotplug system to figure out
the relationship on its own (A: I'm doing something weird and it doesn't
work.. B: Don't do something weird) !
--Ivan
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