ggs at shiresoft.com
Wed Mar 14 18:31:26 CDT 2007
Jay West wrote:
> Next I would like a way to test interrupts in this minimal
> configuration (that was where the problem was before, no matter what
> device interrupted it would always trap to the same address). I would
> assume I have to put something like an M7856 in next in order to test
> this. Sound like a reasonable next step? Remember, in the config I
> have right now I've just got 3 quad SPC slots... hex cards are not an
> option (yet).
One of the easiest things to do is to use the LTC (on the M7856) and
write a small program that counts at 60Hz (or any sub-multiple) on each
"tic". The counter (if in R0) will be displayed on the console lights
when you're in a WAIT.
One thing you want to check is to make sure that your backplane is *not*
wired to have an M787 be the LTC (mainly for the grant chain).
Otherwise, you'll have to use the M787 and disable the LTC function on
TTFN - Guy
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