9 Feb
2021
9 Feb
'21
9:45 a.m.
Though i?m no expert, it looks like those are more an artefact of production, rather than
usable test points. It seems like those pins extend throughout the ceramic substrate, and
were most likely produced by pushing the pins through holes in the substrate and then
soldering them. This may have been a solution used when the factory making them had
limited tooling, or the chip was particularly low volume and more dedicated tooling was
uneconomical.
On Feb 9, 2021, at 10:27 AM, Paul Birkel via cctalk
<cctalk at classiccmp.org> wrote:
In item https://www.ebay.com/itm/265045229011 I am curious as to whether the
gold islands on the top-side are functional test-points giving electrical
access to the underside pins? Was there a clip designed to attach to the
top-side of these chips for use in circuit analysis? Was this design unique
to Russian manufacture (I don't recall ever seeing this design previously)?
paul