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40,168 Views • May 3, 2024 • Click to toggle off description
Many thanks to HP enthusiast Craig Ruff for the ROM dump and disassembly.
8" Floppy Playlist: • 8" Floppy Diskette Drives
HP 9825 Playlist: • HP 9825 Repair
Ken's Silicon-on-Sapphire chip blog post: www.righto.com/2023/12/HP-silicon-on-sapphire-phi-…
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: www.curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: www.patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, www.pcbway.com/
- Electro-Rent: www.electrorent.com/
- Keysight: test instruments: www.keysight.com/
- Samtec: connectors: www.samtec.com/
- R&D Microwaves: rdmicrowaves.com/
Get more technical info on the companion site: www.curiousmarc.com/
Contact info: youtube.com/curiousmarc/about
Views : 40,168
Genre: Science & Technology
Date of upload: May 3, 2024 ^^
Rating : 4.954 (33/2,858 LTDR)
RYD date created : 2024-05-17T22:25:58.273798Z
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YouTube Comments - 173 Comments
Top Comments of this video!! :3
"Yeah...... Obvious......" 🤣
I'd say "Master" Ken has truly earned that title!
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That chip tour intermission was fantastic!
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Always a pleasant surprise when the chip you bought on eBay actually works and meets the advertised spec!
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Back in the 80s, my dad, a materials science engineer who worked in the valley, was doing a ton of silicon on sapphire work for DoD. They were really interested to see if chips using it would be hardened against EMPs since the sapphire substrate would be a fantastic insulator. Many weekends I would go into work with him and get all bunny suited up so I could watch him check on some run he had going in the fab. Fun times and great memories!
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Spent a fair amount of time programming instruments with HPIB, usually with Fortran. That was at Univac on a large HP test system with many programmable instruments.
Two companies later, at Iomega, we were using custom disk drive controller chips. The first iteration of a new chi[ design came from fab with a bug. The brilliant chip designer with me 'helping' debugged the chip with micro-manipulators and was actually able to repair is by scraping metal and creating a short enabling us to make further progress on the new design debug. Good days.
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Master Ken has truly gone off the deep end where you have learnt so much that you can't remember what a new person to the topic would and wouldn't recognise anymore :) Always awesome seeing such deep dives into engineering, while the chips we're looking at are still visible in optical light :D
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"10 beginner programmers' mistakes: syntax error, undeclared variable, off-by-one error."
Nice work! Always happy to see you recombobulate vintage tech to a good working order.
That chip looks extremely complex, I couldn't make anything meaningful out of it. Ken is a true Sheriff of Electronics, ha! And again, I hope I learned something.
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I repaired prototype IDC (Integrated Disc Controller) boards for the HP 7906/20/25 in 1979. I graduated college a few months earlier so it was a great opportunity. The IDC also used the PHI chip. Fortunately I had lots of spare Silicon on Sapphire PHI chips.
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It is amazing to see a group of REALLY SMART guys tackle these engineering challenges!
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The (almost) full team! One of those videos you watch multiple times! :D
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Bringing out the logic analyzer. -- meh
Bringing out Ken and Eric. -- HERE WE GO!
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I hope the next episode is repairing the faulty chip. That would be an impressive chalange.😊
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You guys just astound me, I so enjoy watching you get stuff on its feet again.
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Master Ken - you are famous even in Switzerland. I hope we meet one time in person! Maybe I can take a short trip during my next US visit to have a coffee and some words.
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großartig - Thank you, CuriousMarc for showing us such a beautiful view of a chip layout under the microscope on YouTube. It would be great to see a modern chip for comparison sometime.
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"It's a bad bit. A bad, bad bit..." "And here are the Castle Marc, we have but one punishment for data curruption!"
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Great video, again. Many thanks for the information about Hi-speed data transfer.
Anyhow, about the GPIB @ 3:38, it is a 8 bit parallel bus, capable of 1 MByte/s (not 1MBit/s) data rate.
I as well still use a lot of GPIB based instruments, especially (again) the HP3458A, where I really needed this high speed transfer for data acquisition, 200kByte/sec for a 16Bit, 100KSa A/D conversion. That was in 1989, for a real-time FFT analyzer, programmed on a 20MHz AT PC, in assembler language, with a lot of tricks, like DMA, SRQ handshaking, low level PIO and GPIB commands.
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You know you've hit a big problem when you need to assemble the brain trust :-P - Amazing work as always, thanks for taking us along with you for the ride!
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"The Input Buffer shall be equal to or greater than zero in length." — IEEE 488.2 apparently feeling the need to explicitly exclude the use of negative-length buffers
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@alanclarke4646
2 weeks ago
Master Ken's reverse engineering skills are awesome!
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