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'x-ray eraser: WHY?'
1998\05\12@011750 by William Chops Westfield

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   I am genuinely confused.  Many engineers in embedded programming are
   earning $25 per hour, and billing clients at $50-$75 per hour.  Why in
   God's name are you playing with X-rays to save $5?  Maybe I'm missing
   the point.  Enlighten me (with the visual spectrum).

Well, for the hobbyist, it could mean BUYING $2 OTPs instead of $15
windowed versions.  We like that sort of thing.  It would also mean
that you could reuse "found" parts...

>From a commercial perspective, consider the thought process that occurs
when the batch of 1000 long-lead-time programmed OTPs is ready just at
the time the SW department discovers the critical bug.  Cisco briefly
looked for a way to erase OTP eproms (of the 20ns cycle microcode
containing variety) when we had a couple hundred sets (11 chips wide, I
think - several thousand parts) that were found to contain a serious
bug...  I don't think we found it.

If it were possible to erase OTP parts, it might still be impossible at
the "amateur" level, but you can bet your dollars there would be a
company providing the service for a fee.  (Maybe.  It's also possible
that "radiation" regulations would prevent this from ever being
ecconomically feasible.)

BillW

1998\05\12@075321 by paulb

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William Chops Westfield wrote:

> Well, for the hobbyist, it could mean BUYING $2 OTPs instead of $15
> windowed versions.  We like that sort of thing.  It would also mean
> that you could reuse "found" parts...

 Yes, it happens I am (at present!) a "hobbyist" class user of these
things, and I "find" a lot of parts, thus my slant.  Similarly, I have
no particular need to re-use syringes as I have boxes of them lying
about (well, neatly stored), while others (particularly for "hobby" uses
- have to be Politically Correct here too!) might do so.

 Please do remember too that when you quote food costs and wages, they
numerically equate quite similarly (from the US) to here, as do
(curiously) assembled computers, but by the time we get components such
as PICs imported, the figure is double.

> If it were possible to erase OTP parts, it might still be impossible
> at the "amateur" level, but you can bet your dollars there would be a
> company providing the service for a fee.  (Maybe.  It's also possible
> that "radiation" regulations would prevent this from ever being
> ecconomically feasible.)

 It's also possible that handling fees and lack of warranty (for quite
obvious reasons) would be prohibitive in the commercial sense, just as
a *lot* of otherwise worthy recycling is.

 Cheers,
       Paul B.

1998\05\12@145335 by andre

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This is just my opinion.
I do not think any body will  buy x-ray machine to
erase any otp's. ( sounds like no thing to do )
engineers or hackers just wants to more about PIC MCUs or
they like it a lot  wants to learn more about it.
what are they going to do with it I do not know. this is what I know
if Microchip found that  OTP's are enable by x-ray  they will
come up a solution right a way you do not even notice it.

Andre Abelian







William Chops Westfield wrote:

>     I am genuinely confused.  Many engineers in embedded programming are
>     earning $25 per hour, and billing clients at $50-$75 per hour.  Why in
>     God's name are you playing with X-rays to save $5?  Maybe I'm missing
>     the point.  Enlighten me (with the visual spectrum).
>

1998\05\13@021839 by White Horse Design

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At 22:15 11/05/98 PDT, you wrote:
>    I am genuinely confused.  Many engineers in embedded programming are
>    earning $25 per hour, and billing clients at $50-$75 per hour.  Why in

More like US $ 60 here in the UK plus 17.5% VAT (what the USA calls sales
tax).

Regards

Adrian

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