21 Mar
2000
21 Mar
'00
9:08 a.m.
On Mar 21, 21:48, Tony Duell wrote:
Well, I once ripped the metal lids off a few ceramic DRAMs to use them as
optical image sensors (ISTR an article in BYTE, I think it was, years ago
about that), and there's a story about how Ferranti designers determined
that a particular ULA design worked perfectly if only you could get at the
gates with a microprobe to add a pullup in a certain place, but these SRAMs
are plastic and I've run out of fuming nitric acid :-(
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
> else, long before I posted my request. I could
fix about anything
else on
> the PET, but I draw the line at grinding the top
off to poke at
individual
flip-flops in
an IC :-) FWIW, the first job I had in
Really, kids these days..... 
21 Mar
21 Mar
11:06 a.m.
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10:11 p.m.
On Tue, 21 Mar 2000 23:08:20 GMT Pete Turnbull
<pete(a)dunnington.u-net.com> wrote:
Well, I once ripped the metal lids off a few ceramic
DRAMs to use them as
optical image sensors (ISTR an article in BYTE, I think it was, years ago
about that), and there's a story about how Ferranti designers determined
that a particular ULA design worked perfectly if only you could get at the
gates with a microprobe to add a pullup in a certain place, but these SRAMs
are plastic and I've run out of fuming nitric acid :-(
Then there's the transputer prototype that only worked when
under strong illumination (like in a probe/microscope
setup) and didn't work in the dark (like with the lid on).
Solution: omit the lid, and supply a car headlamp bulb to
provide enough light.
--
John Honniball
Email: John.Honniball(a)uwe.ac.uk
University of the West of England
9042
days inactive
9043
days old
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pete＠dunnington.u-net.com