[Coco] MPROM woes (cured)

[Art Flexser]

On Sat, 15 Nov 2008, Roger Taylor wrote:

> At 07:43 PM 11/15/2008, you wrote:
> >>Ok, the problem was that the source voltage was just not high 
> >>enough.  I put 3 brand new alkaline batteries in the harness and 
> >>now the unit is writing a 27128.  :)
> >>This is an issue I dealt with many years ago, going through many 
> >>batteries just because they fell below something like 8.5v and 
> >>didn't supply over 25v to the regulator.
> >>
> >>--
> >>Roger Taylor
> >
> >
> >So, what would happen if we put four 9v batteries in series?  A 
> >starting point of 36 volts into the regulator should hold up a while longer.
> >
> >Bruce W.
> 
> 
> I tried 4 9v batteries a few days ago and for some reason it wouldn't 
> work.  That is, the software kept reporting a no-go on the first 
> write cycle.  The EPROMs remained blank.  Maybe it was just some of 
> the batteries in series holding up the rest, as I didn't check the 
> total voltage.
> 

There remains the possibility that those 4-battery EPROMs you tried are now
fried, and are not only blank but now unprogrammable.

Art