I'm in need of a JTAG interface cable for a project I'm working on.  I'm 
trying to figure out the best way to proceed.

In short, it looks like although the JTAG interface on the 
system-under-test-or-programming side is fairly standardized, the 
interface on the PC is anything but.  It looks like to program a device 
via JTAG, you need an appropriate pice of software on the PC which knows 
how to drive the JTAG for that device to do the programming.  It also 
looks like each of these software packages only support certain cables, 
and which ones don't appear to be well documented at all.

For the immediate project I could build a cable, but would prefer to 
find a solution which will work for almost anything I need it for JTAG 
wise since it seems that there are getting to be more and more projects 
which need a JTAG "programmer" for some part of it.  In fact, right now, 
I have two projects to work on - the critical one, and another which has 
been waiting in the wings.

For those of you which use JTAG, which interface cable would you 
recommend I build or buy for the broadest support of devices?

-forrest
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