714K views · Oct 5, 2020 · 29:44 · 1 HN recommender · 3 mentions · discussed 2021–2022
Dave Jones of EEVblog tears down a 1991 IBM 9121 thermal conduction module from a System/390 mainframe, a 63-layer ceramic hybrid module with 2772 pins worth about $250,000, and demonstrates a BGA desoldering technique.
Why Hacker News points people here: Cited in threads on chip packaging and cooling as a vivid look at vintage IBM mainframe module construction.
“Dave from EEVBlog also made a video about it”HN comment, 2021
“Dave from EEVBlog also made a video about it”
EEVblog teardown of a vintage IBM mainframe processor module.
All the vintage mainframe stuff is pretty mind blowing. There is an awesome hidden gem on YouTube: CPU Galaxy. He has a huge collection of vintage CPUs. IBM 9121 Mainframe CPU link Dave from EEVBlog also made a video about it this video
Shows 1980s IBM mainframe thermal and packaging similar to Dojo.
The thermal solution and packaging looks a lot like mainframe systems from the 80s (IBM, Siemens, Japanese). Siemens H100: link link IBM: this video
“It have a bunch of pistons on springs touching each chiplet, all in mineral oil.”
Shows IBM module with spring-loaded pistons cooling each chiplet.
This one does[1]. It have a bunch of pistons on springs touching each chiplet, all in mineral oil. Price bit out of range for typical desktop user tho * this video
