test-drb March 2011

test-drb@ccmp.vtda.org

146 participants
225 discussions

by bknittel＠quarterbyte.com

Anyone have direct, real-world experience in setting up three phase for IBM gear, particularly the 3880 and the 3803 (dasd and tape) controllers? I need to know how to determine if the setup needs to be wye or delta. And, if you're local to the SF Bay Area, there will be some smoke-test parties coming up. (Scary parts of the work performed by a licensed electrician). Hands on help before, during and after will be appreciated. Pizza will be provided.

13 years, 1 month

DEC 872-A power controller docs?

by chrise＠pobox.com

Are there any documents for a DEC 872-A Power Controller floating around? The 872-A is a 12A, 110V power distribution/control unit that I have in the bottom of my "corporate rack". Specifically I'm interested in what the signaling is on the two, 3-pin Molex jacks labled "DEC Power Control Bus", which presumably is a means to remotely control the power to the devices in the rack via this PDU. Chris -- Chris Elmquist

13 years, 1 month

Three phase and IBM

by jonas＠otter.se

Fred Cisin wrote: > Don't necessarily trust "electricians" or utility companies either! > > 35 years ago, in a brand new building (roof, but no floor yet), landlord's > electrician and PG&E wired the three phase for my compressor wrong, > providing ~200 volts to all of the outlets. Today at lunch, one of my co-workers told us about an occasion a number of years back, when an electrician at the local electricity company (in a small town in Sweden) had made a wrong connection, feeding the whole area about 300V instead of 220V. Apparently it cost the power company millions to replace all the freezers and fridges that had burnt out. /Jonas

13 years, 1 month

IBM 1130 restoration @ VCF East

by evan＠snarc.net

Yet another awesome reason to attend VCF East 7.0: witness the beginnings of a "live restoration" of our museum's IBM 1130 mainframe, conducted by Norm Aleks and Brian Knittel, both of http://www.ibm1130.org ... they're traveling all the way from Berkeley, California. http://www.vintage.org/2011/east http://www.facebook.com/vcfeast7 http://www.snarc.net/vcfe7flier.pdf

13 years, 1 month

Three phase and IBM

by bknittel＠quarterbyte.com

Examination yesterday showed: * All connectors have 4 pins, and one wire is green * Labels in most of the gear just says "see manual" but two pieces are clearly (and multiply) labeled "wired for 208V" * Schematics show everything wired phase-to-phase, no neutral * 110V "convenience outlets" are run from a step-down transformer between 2 phases So, it appears to be 208V delta. I can run this from a wye-output transformer, though, right? Its plate says 208V phase-to-phase. Brian

13 years, 1 month

Three phase and IBM

by brian＠quarterbyte.com

One thing I forgot to mention: all of the three phase plugs have a label that indicates the required phase direction.

13 years, 1 month

Anyone have a big iMac collection?

by trag＠io.com

> Date: Sat, 19 Mar 2011 17:27:36 -0700 > From: Bruce Damer <bdamer at digitalspace.com> > Hi folks, does anyone in the Bay Area or California have a big "multi > color" iMac G3 collection (from late 1990s-2001 or so)? A guy is > asking the Digibarn about this but all we have is one Bondi Blue model. > I remember seeing photos of some guy's basement, which was well appointed with stylish furniture and it was all holding his collection of macs in a ready-to-use fashion. Part of his collection was a large assortment of "flavors" of imacs. It was a truly impressive display. Unfortunately, I have no memory of where I saw these pictures. I'd guess it was a link from 68kmla or applefritter, but I am not certain of that. Someone on one of those two sites might have a clearer memory of what I'm thinking of. Of course, there's no saying that the collection is still extant, nor that it's geographically located as you specified. Jeff Walther

13 years, 1 month

Manuals / jumper map for NEC FD1165 with G9NYB PCB

by classiccmp＠philpem.me.uk

Hi guys, Does anyone have a copy of the OEM manual (or service manual) for the NEC FD1165 disc drive variant which had the "G9NYB" controller board? I've got one of these on the bench, which I'm trying to attach to the DiscFerret. The jumper settings don't make sense, and the location and function diagrams in the manual on Bitsavers are for a drive with a G9NYF controller board... Does anyone have a jumper map or a copy of the manuals for this thing? Thankfully the power connector was labelled -- thank you NEC! Unfortunately the two DIL terminator resistor packs have been snaffled, and I'd rather like to know if the G9NYB used the same 150-ohm resistor pack the G9NYF used before I go installing a bunch of MR25 resistors in their place (seeing as I haven't got any 150R x8 DIL packs) Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

13 years, 1 month

Smoke From PSU Socket

by robert.jarratt＠ntlworld.com

I was given a DELNI recently, but it did not seem to work so I unplugged it for later inspection. I just plugged it in now and it went up in smoke, knocking out all the sockets in the house. I have opened it up and the curious thing is that none of the capacitors has or any other component of the PSU is showing any signs of damage, there is scorching only around the socket itself. I am not knowledgeable on PSUs, what does this mean? Thanks Rob

13 years, 1 month

Three phase and IBM

by CCTECH＠beyondthepale.ie

> >Examination yesterday showed: > >* All connectors have 4 pins, and one wire is green >* Labels in most of the gear just says "see manual" but two pieces are clearly > (and multiply) labeled "wired for 208V" >* Schematics show everything wired phase-to-phase, no neutral >* 110V "convenience outlets" are run from a step-down transformer between 2 phases > >So, it appears to be 208V delta. > >I can run this from a wye-output transformer, though, right? Its plate says 208V phase-to-phase. > Yes. If there aren't any three phase loads that care (such as motors), then you don't need to worry about which order the phases are connected in. The only other thing I can think of is to check that the transformer can supply the required current. Regards, Peter Coghlan.

13 years, 1 month

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test-drb March 2011