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Old 8th Apr 2021, 4:06 pm   #155
ortek_service
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Join Date: May 2018
Location: Northampton, Northamptonshire, UK.
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Default Re: The Transam Triton Personal Computer

That's a really good image of the top-surface (even better than previous one)
And it looks like there's 4 'via' holes at the corners that have either filled with conductive epoxy or solder - no evidence of specialist bond-wire pads at least!

Can you get a similar close-up photo of the underside of this 'chip' / the ceramic alumina substrate's pads ?

You could try to see if it's solder, to see if it melts - but need to be careful, as pads can leech away if heated by just a soldering-iron tip and aren't protected with tin-plating etc. And ceramic substrate really needs heating with a background heater / hot air, as it's a very good thermal conductor so makes soldering with just an iron quite difficult.

Plus, if pads on underside don't extend beyond edges of the chip, then it can't really be fitted using a soldering iron, but would require solder-paste and hot air, or very small amounts of conductive-epoxy.
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