Recent content by pbirkel@gmail.com

I'm aware of that. However the designation "HEPA" is trademarked by the HEPA CORPORATION (at least until 2027 it seems; renewed in 2017 for another ten years) according to: https://trademarks.justia.com/736/54/hepa-73654415.html The FRU for "Absolute Filter" on page II/1-3 in...

See: https://datassette.s3.us-west-004.backblazeb2.com/livros/z80_applications.pdf

Modern capacitor markings can be inscrutable; so little surface space for marking. Yes, that would be 10 uF maximum 15 Vdc -- perfectly reasonable for a 5 volt rail. Yes. Hopefully another 5V rail. There ought to somewhere be some capacitors with higher voltage ratings on the +-12V rails...

At what cost? Who was the original manufacturer; I thought that it was HEPA Corporation?

One issue is that "street rodders" don't use HEPA (0.3 micron) filters, do they? It's the "absolute filter" that's key. https://web.archive.org/web/20200424101345/http://hepa.com/ is no longer with us, but certainly the equivalent material(s) are used by many manufacturers. A basic description...

How did you accomplish that task?

Yes, it's a dipped tantalum decoupling/smoothing capacitor on the adjacent power-input rail. Lacking a schematic I'd (1) look at the markings on the nearby looks-the-same tantalum capacitor and determine what the voltage is on its associated power rail, and (2) determine the voltage on the...

I notice that their current listing (https://www.ebay.com/itm/226014959589) shows a "certification label" that I guess is pre-11 era. Interestingly it's not actually marked as to which certification applies. How should the marked, or unmarked, presence of this label be understood? What about...

I'm guessing that @NF6X objective of (re)using the blue-canister tapes on a non-LINC PDP "ain't gonna happen"?

Yes! Audio starts at ~30 seconds in.

No response, alas. So I'm asking here :-}!

Thank you Chuck. :)

Yes. See Figure A-8 and Page A-9 in: http://bitsavers.trailing-edge.com/pdf/dec/pdp8/pdp8e/DEC-8E-HMM1A-D-D_PDP-8e_Maintenance_Manual_Volume_1_Processor_Sep73.pdf Probably would have to create a substitute using SMD logic ICs on a DIP(ish)-sized PCB.

LMI: https://en.wikipedia.org/wiki/Lisp_Machines Symbolics: https://en.wikipedia.org/wiki/Symbolics https://metebalci.com/blog/cadr-lisp-machine-and-cadr-processor/

Not my area of expertise/understanding Chuck :-{. I can only suggest either (1) create a new "v2" project in Github, or (2) bundle up your updated source and post it here as a zip (and make reference to this thread in the Github intro). [Or (3) learn Github ...]