[Coco] MPROM woes (cured)

[Roger Taylor]

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.

If the regulator won't fry with 36+ volts, I'll do it.  Most new 9v 
batteries are over 9v, as you probably already knew.  So I would assume ~38v.
That sounds like what a Lexmark printer power supply cord puts out, 
or is it 30?  30v from a wall adapter would be great.

-- 
Roger Taylor

http://www.wordofthedayonline.com