Re: VECTOR: battlezone

the voltage is 5.1v.
the 139's are original and are made by the same company. two have 8048 and
one has 8049.
i'll change them.

----- Original Message ----- 
From: <[email protected]>
To: <[email protected]>
Sent: Friday, December 17, 2004 1:27 PM
Subject: Re: VECTOR: battlezone


> On Fri, 17 Dec 2004 12:39:35 -0500, you wrote:
>
> >in test mode i get a variation of a square wave on all the address lines
> >but in normal mode 4 address lines don't look right. i hate to keep
coming
> >back to the address lines, but 3 of the lines go to the decoder and the
> >output from the decoders don't change. it seems the thing to do is change
> >the decoder chips, but the 3 lines feed 4 chips. i just don't see all the
> >chips going bad at the same time.
>
> "An ancestor of mine once maintained that when one eliminates the
> impossible, whatever remains, however improbable, must be the truth."
> (--Spock, from STAR TREK VI)
>
> While all four going bad at once is unlikely, it CAN happen.  Some
> chips CAN be more prone to failure than others, for all kinds of strange
> reasons.  (Internal complexity, variation in design from one manufacturer
> to another, the kinds of signals they're expected to deal with, phases of
> the moon, local variations in the neutrino density of the space/time
> continuum, etc. :) )  Even within a particular logic family or
> manufacturer, some chips are less tolerant to supply-voltage variations
> than others, for example, and will more readily commit seppuku the first
> time the +5V rail creeps above that +5.25Vdc "max Vcc rating."
>
> Are all of the decoder chips the original ones, and are they all of the
> from the same manufacturer and of the same date/batch code?  Or have one
or
> more of them already been replaced before?  (If they're all originals from
> the same manufacturer and batch, there's always the outside chance there
> was a minor flaw in that particular production run.)
>
>
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> solarfox@DON'TMESSWITHtexas.net                              (Gary Akins
jr.)
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