[time-nuts] HP8568B firware eproms anyone ?

Poul-Henning Kamp phk at phk.freebsd.dk
Thu Oct 19 07:47:52 EDT 2006

In message <PKEGJHPHLLBACEOICCBJOEKDIJAA.jmiles at pop.net>, "John Miles" writes:

>Poul, if you need a set of them burned for you, drop me a line
>off-list with your address... be glad to send you some.

Thanks for the offer, but I managed to wing it.

>Note that the part number may cross to a 27C256, but I have had no luck
>trying to use CMOS EPROMs in the HP 8566B/68B analyzers.

Well here is a different data-point for you:

I have a programmer but no UV-eraser so I had to be a bit creative.
I have a handful of AMD 29F010 flash chips lying around.

They are four times the size of the 27256, so I programmed
them with four times the imagefiles and left the to surplus address
lines floating.

Yeah, I know, it's bad, but it's nothing compared to what follows:

29F010 are 32-pin chips and 27256 are 28 pin and the gap between
the sockets are almost enough to make them fit.

So I took my dremel and sanded the ends of the chips until they fit.

Final bit of hackery is to solder the last 3 pins together so that
-WE and VCC on the 29F010 gets in touch with VCC from the socket.


Somebody at Agilent will cry if they see this :-)

But it works, thanks a bundle for the help!


Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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