September 2019 - vcf-midatlantic

Sat. 14
by Fred Terry 09 Sep '19

09 Sep '19

I hope someone will be at the Museum Sat. 14 I could speak with about help getting my Imsai 80/30 and Persci running again. I guess I’ll be there after 11:00. Fred Terry

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Re: [vcf-midatlantic] OFF TOPIC - Frequency time base
by Evan Koblentz 09 Sep '19

09 Sep '19

>> Does anybody know if the museum has a time base generator, somewhere around 5, 10 or 20 MHz? (+-20hz) I need to calibrate a frequency counter We don't own anything like that. It is possible that NJARC (antique radio/TV group) or CDL (makerspace) has it. On Mon, Sep 9, 2019, 2:32 PM Sentrytv via vcf-midatlantic < vcf-midatlantic(a)lists.vcfed.org> wrote: > >> On 9/8/19 8:55 PM, Sentrytv via vcf-midatlantic wrote: > >> Does anybody know if the museum has a time base generator, somewhere > >> around 5, 10 or 20 MHz? (+-20hz) > >> I need to calibrate a frequency counter. > > > > On Sep 8, 2019, at 11:06 PM, Dave McGuire via vcf-midatlantic < > vcf-midatlantic(a)lists.vcfed.org> wrote: > > > > > > If you make it to the Pittsburgh area, I can do NIST-traceable > > frequency calibration in my lab, to a whole lot tighter than 20Hz. (move > > that decimal point about six digits to the right, man!) > > > > Gratis for all of my friends here, of course. > > > > -Dave > > > > -- > > Dave McGuire, AK4HZ > > New Kensington, PA > > > > Thank you for the offer, > But I doubt I will be in that area anytime. > > I was hoping that somebody had a portable unit and might bring it to the > workshop. > and or maybe the museum had one somewhere, possibly in storage, I would > not be able to tell how accurate it is, but I'd give it a shot. > > Mike R. > > Sent from: > My extremely complicated, hand held electronic device. > > > >

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Re: [vcf-midatlantic] OFF TOPIC - Frequency time base
by Dave McGuire 09 Sep '19

09 Sep '19

On 9/8/19 8:55 PM, Sentrytv via vcf-midatlantic wrote: > Does anybody know if the museum has a time base generator, somewhere > around 5, 10 or 20 MHz? (+-20hz) > I need to calibrate a frequency counter. If you make it to the Pittsburgh area, I can do NIST-traceable frequency calibration in my lab, to a whole lot tighter than 20Hz. (move that decimal point about six digits to the right, man!) Gratis for all of my friends here, of course. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

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ISO: Philips CDI 350/360 power supply
by Herb Johnson 09 Sep '19

09 Sep '19

> In search of a power supply for a Philips portable CDI 350 or 360. Look on eBay today. There's an auction for a complete unit. (A CD-ROM based gaming? device.) It has photos of the power supply. It's not cheap but it will inform you about the power supply. It appears there's voltage/current information on the bottom of the player/controller. It appears the power connector is uncommon. If so and you have to build a power supply, that's a challenge. Regards, Herb -- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net

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Looking for drive bezels for Power mac 8100/8500/9500
by Matt Patoray 09 Sep '19

09 Sep '19

Hi all, I have started a restoration project to get my Power Mac 8500/180 DP up and running again. Part of that process will be a physical restoration which is already underway. To finish it out I need two drive bezels that never had for the machine. I am needing th CD-ROM and DAT drive bezels, does anyone have either that they are willing to sell me, all plastic tabs and nubs intact a plus but not 100% necessary (we all know how fragile early to mid 90's Apple plastic is). Thanks -- Matt Patoray Owner, MSP Productions KD8AMG

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Wireless RS-232 bridge
by Mike Loewen 09 Sep '19

09 Sep '19

Looking for a wireless RS-232 bridge to connect 2 serial ports over an indoor distance. Recommendations? Mike Loewen mloewen(a)cpumagic.scol.pa.us Old Technology http://q7.neurotica.com/Oldtech/

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OFF TOPIC - Frequency time base
by Sentrytv 09 Sep '19

09 Sep '19

Does anybody know if the museum has a time base generator, somewhere around 5, 10 or 20 MHz? (+-20hz) I need to calibrate a frequency counter. Sent from: My extremely complicated, hand held electronic device.

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ISO: Philips CDI 350/360 power supply
by Dean Notarnicola 08 Sep '19

08 Sep '19

In search of a power supply for a Philips portable CDI 350 or 360. Trying to restore one for my son, sadky it has a proprietary connector. Contact me off list. Thanks in advance! Dean

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Looking for DIP Sockets
by J. Alexander Jacocks 08 Sep '19

08 Sep '19

All, I’ve realized that my stock of IC sockets has become dangerously low. If anyone is looking to part with a significant quantity of varied narrow and wide standard pitch sockets, I’m interested. Of course, I’d prefer machine pin sockets, but beggars can’t be choosers. Thanks! - Alex

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Dec Ka670 bus?
by W2HX 07 Sep '19

07 Sep '19

Hi friends, I have been reading about the evolution of these vax processors starting at the KA630, KA650 etc. I just came across the KA670 which seems to have a new bus connector. Instead of the typical ABCD card edge connectors there is a 270 pin connector like a din or vme looking thing. Reading about it, apparently it still carries the Q22 bus, but also now has a memory bus (pmi? Gbus?) And a dssi bus. Very interesting! Anyone know if this type of backplane using these connectors has a name? Typically a bus is often synonymous with the physical connectors used, but in this case it is not. Not that it had to be but commonly it is. Any info on the bus such as history, evolution from the card edge used since the pdp-8 would be interesting. Thanks 73 Eugene W2HX Sent from Nine<http://www.9folders.com/>

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