Limp home mode

[Ludis Langens]

Bob Wooten wrote:
> 
> what I am
> ultimately trying to do is to pull the ~RESET line so that I can shut down
> the CPU.  with the emulator that I just bought.  I figured that I could tie
> into Pin 2 but it appears that this is not working as I guessed it would  by
> holding it down it appears that the entire CPU is still "dead" & the
> emulator does not like that.

Pin _two_?  There's no chip in a '7730 where pin 2 is ~RESET.  The
regular reset comes from pin 1 of U17.  You may notice a 5.1K pullup to
VCC.  I'm quite sure that everything driving the reset line has an open
collector driver.  That means that at most, you have to sink about 1ma.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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