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106,349 Views • Apr 26, 2024 • Click to toggle off description
After removing the lid with hot air, the silicon chip inside can be viewed with a microscope.
There is limited information about these parts, but the consensus is that they are custom ROMs, but the specific application isn't necessarily known. I have many different versions of this part from various manufacturers. This one is from AMI, but the others are marked with the Fairchild and Burroughs logos.
The part I opened in the video is marked with a date code of 7407, which should translate to the 7th week of 1974. The other number on the lid is 2472-8861, which is a different 8 digit number from the other parts. There are a total of 51 pins on this white ceramic Pin Grid Array part.
I assume that if I was to open up the others, they would most likely have the same or similar chips inside, but the ROM would contain different hard-coded information.
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Genre: Science & Technology
Uploaded At Apr 26, 2024 ^^
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RYD date created : 2024-09-12T17:55:56.351721Z
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YouTube Comments - 141 Comments
Top Comments of this video!! :3
These ceramic packages are so beautiful!
148 |
You should look up the CPU of the HP9825 "calculator" It's a multi die ceramic package. The machine was released in 1976 and had a 10 MHz 16-bit CPU. HP sold these machines as "calculators", cause in 1976, most governments and businesses still made you go through tons of red tape to requisition a computer, which still had the stereotypical views of being incredibly expensive cabinet and room sized ordeals... By 1976, computers could sit on your desk, and most organizations had no red tape for buying a calculator, even a "specialty" calculator. HP realized by naming this obvious computer as a calculator, they could get them to engineer's desks more easily than if they called it what it was. I happen to have one, and it's a pretty neat machine!
41 |
I think these may be the micro-instruction ROMs from the almost unknown AMI7200/7300 CPU chipsets. Have a look for Ray Holt's story about the development of the F-14's CADC, and his later career at AMI after leaving Garrett/AiResearch where he was one of the designers for these CPUs.
62 |
Thank you for everything that you do. I appreciate your helpful videos and wish only for happiness in your future. I enjoy learning more about all these microscopic canvases that permeate every part of our lives.
25 |
Love the sound effects removing the cover
29 |
Honestly, Artwork. Just gorgeous from material to design. All baby miracles from way back.
13 |
I used to have a "butterfly collection" of chips in packages at my first job at Fairchild. This looks like one of the ones I had.
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Yes, you can see the bits. You can manually count every bit and create a file out of it.
24 |
Hey, I got 3 of these. They came to me being socketed on a board labeled “N-BDS processor” (there were supposed to be 4 of these chips, but I only got 3). Upon further research, I found that this board was a part of the processing unit for a Burroughs B80 computer. I even found a schematic of that processing unit (including my board), but there is still no detailed explanation of what each chip is supposed to do.
37 |
Fairchild semiconductor. Instant Rush of nostalgia!!
2 |
Wow you have a whole tray of them - very interesting.
5 |
Beautiful ceramic substrates and traces, the older the golder!
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Those things look like works of art.
9 |
Love your channel. Best content for learning about ICs.
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That looks pretty advanced for the 70s!
19 |
I imagine the Fairchild ones would be interesting to decode.
5 |
Could you share a clear photo of the memory array (via a link in a comment?) I'd love to have a crack at decoding and scanning for some ascii strings!
10 |
WoW! Thanks for posting these!
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I have old boards just like the ones you show at the end, featuring the same kind of chips, and the same card edge connectors. Even the same form factor. I know for sure that the lot came from a process control system in a chemical plant. 70's tech.
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@travelblazer07
4 months ago
The fact that we can create such microscopic circuits even as old as 50+ years ago makes things like these fascinating to see
297 |