[time-nuts] HP8568B firware eproms anyone ?

[Didier Juges]

My kind of guy :-)

Congratulations!

Reminds me a long time ago when building 120 audio amplifiers as part of 
a college hobby gone crazy, I had laid out my PWB for mini-DIP (DIP8) 
op-amps (uA709, because that's all there existed back then), with the 
frequency compensation caps at each end of the package to keep traces 
short, but after the board was laid out, I got a great deal on 1200 much 
cheaper uA709s in DIP14 packages. I had a crew working a few evenings 
with side cutters to make the DIP14s into DIP8s, all 1200 parts. Worked 
great, almost 100% yield even though there were some holes in fingers, 
and even though it did not look nearly as good as what you just did :-)

Didier KO4BB

Poul-Henning Kamp wrote:
> 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.
>
> 	http://phk.freebsd.dk/misc/8568b_flash.png
>
> Somebody at Agilent will cry if they see this :-)
>
> But it works, thanks a bundle for the help!
>
> Poul-Henning
>
>