[sebhc] hard sector substitute (for caffeine)

[Jack Rubin]

<snip>
 
> He had this blank expression on his face and said he didn't 
> know about how long, but an interrupt was generated every 
> 200us. I got out a scope and proceeded to find out that his 
> interrupt routine was taking 300us to execute, so of course 
> it was missing interrupts at a pseudo random rate. I rewrote 
> his routine to get it below 200us and then everything worked fine.
> 
> best regards, Steve Thatcher
> 

LOL - better than Starbucks to start the day - thanks!
Jack

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