test-drb January 2009

test-drb@ccmp.vtda.org

218 participants
340 discussions

by tshoppa＠wmata.com

Gordon writes: > On Tue, 2009-01-20 at 18:06 -0500, Francesca C. Smith wrote: >> On Tuesday 20 January 2009 17:25:42 cctalk-request at classiccmp.org wrote: >> Hi Tim, >> >> Good Eye, >> >> I had to look inside but I found a sticker for a Ball Brothers Model TV-50 :-) >> >> The main logic card is in fact a generic Digital VT-100 logic board. Although >> I would guess the proms are different. >> >> Unfortunately the CRT neck is broke :-( >> >> Was not packed very well at all by the shipper >> >> I guess I can search around for a CRT somewheres unless anyone has a idea. ?? >Every so often this crops up... Is it a black-and-white CRT? Do you >know roughly what the scan rate is? >Perhaps you could use a tube from a scrapped TV. They can't be *that* >different. A regular VT-100 puts out composite/RS-170 video on a BNC jack on the back. (Classic problem from a few decades ago: people plugging the school's thinnet ethernet onto the VT-100 video out connector!) I don't see any BNC's on the back of Francesca's Franken-VT-100. But I'd be pretty sure the Ball Brothers unit just takes the composite video in. Didn't some early regular VT-100's use Ball Brothers screens and flybacks too? I remember a couple variations of the CRT/flyback boards some more reliable than the others. Somewhere I've got pictures of my garage completely filled with VT-100's! Tim.

17 years

SB-11 (Mailing List Faux Pas)

by fsmith＠ladylinux.com

On Tuesday 20 January 2009 17:25:42 cctalk-request at classiccmp.org wrote: > I should have done the "Smart" thing and looked up BA11-VA on the google > :-) > > I see its a cute lil expansion box as I kinda though. Oh sorry for the top posting. I am a bit under the weather and I have a consulting customer who slaps me virtually if I don't top post. :-) Thanks for the help again identifying this stuff. I will be posting some more in the coming days as I am finally in enough health after the last few years being sick to start playing with the huge pile o vintage goodness crowding me and my family of cats out of house and home. (Although the cats seem to like playing balance on the old teetering PCs and 3100's on the top of the pile :-) ) Also missed was not including the original subject of I wish to ask a thousand pardons for that transgression as well. -- Kindest Regards, No Problems Only Solutions Hosting Admins Baltimore, Maryland

17 years

cctalk Digest, Vol 65, Issue 45

by fsmith＠ladylinux.com

On Tuesday 20 January 2009 17:25:42 cctalk-request at classiccmp.org wrote: Hi Tim, Wow Good Eye Again :-) Yep there are markings over a couple connectors that say Aux Power And Restart. Someone put a piece of masking tape with +5 +12 VDC as well. So I have a mini PDP11 right here. (Reading that link however indicates its a little short on power. Makes one's head spin as this prob predates the IBM PC and what a different world we could have had if Digital had Bill Gates port 86-DOS to this rather than the IBM PC. Oh wait I kinda like my Digital hardware by and large spared the indignity of running M$ anything. :-) Bad enough the Alpha was polluted with that half hearted Win NT port. > Another thought about the SB-11... were those connectors on the back for > sending power to a companion TU-58 drive? Is the SB-11 the same form factor > as the external TU-58 enclosure? We never used them like that, we had > a top-bottom stacked dual 8" drive from... MTI? hooked to our SB-11. > > Tim. -- Kindest Regards, No Problems Only Solutions Hosting Admins Baltimore, Maryland

17 years

Getting a PDP-11/05, RX11, RX01 working

by toby＠coreware.co.uk

I've made some good progress with getting my 11/05 back to full working condition. The stuck bit I had earlier this month I resolved by replacing the sense/inhibit board. Thanks to everyone who advised me on this. I've also got RS232 working on the 11/05s on board console port. After a hunt through many boxes of accumulated junk I came across a little box with an RS232 port on one side and a berg connector on the other. Within the box was a crystal and some level converters. This was exactly what I needed, providing a stable external clock (9600 baud) and using the TTL levels available on the berg connector to provide RS232. Next I acquired an M9301-YF which I fitted to the terminator slot closest to the CPU and booted into its on-board console. All worked well here and I could examine and deposit values into memory via it. Then in went an RX11 (into the SBC slot) which I hooked up to a RX02 with its switches set to make it behave as an RX01. When I tried to boot by typing DX into the console after about half a second of running the machine halts and displays a PC of 4 (IO Trap I believe). If I repeat with the power to the RX01 drive switched off it continues to run until the RX01 is powered on at which point it halts. The RX02 I know to work (as an RX02 at least) as I've connected it to a QBUS machine with RXV211 to confirm Anyone have any thoughts as to what is going wrong? One possibility that occurred to me is that the SBC slot is missing the NPR signal. I have read that this is necessary for an RX11 to work. How do I check if that is present and how do I put it in if its missing? Thanks, Toby -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

17 years

Running 3 phase 780s on single phase power

by tshoppa＠wmata.com

Rich writes: > The electrical > engineer on our team very carefully located three phase-isolated outlets > for us, working from the power panel outwards, before we did anything > else. We tested the plug box for phase isolation before connecting > either VAX, and we had every internal breaker off and every internal > plug disconnected for several hours while we checked the power coming > through the main breaker. In my experience with getting 3-phase power run, even though there's a 50-50 chance that by pure luck he'll get the phasing correct to run the motors in the right direction, I inevitably find that with 100% certainty that the electrician has wired it up reverse of what is actually needed :-). Tim.

17 years

Running 3 phase 780s on single phase power (was RE: hams on classiccmp)

by roger.holmes＠microspot.co.uk

On 19 Jan, 2009, at 23:29, cctalk-request at classiccmp.org wrote: > > Message: 7 > Date: Mon, 19 Jan 2009 11:39:13 -0800 > From: "Chuck Guzis" <cclist at sydex.com> > Subject: Re: Running 3 phase 780s on single phase power (was RE: hams > on classiccmp) > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Message-ID: <49746661.10189.338533BA at cclist.sydex.com> > Content-Type: text/plain; charset=US-ASCII > > On 19 Jan 2009 at 19:17, Roger Holmes wrote: > >> (Who has a 440v three phase computer drawing 13kVA which has three >> phase bridge rectifiers to generate fairly ripple free DC) > > What, no 40 hp MG set generating 400 Hz 3-phase? :) > > Cheers, > Chuck No but it was run off a world war two air ministry (diesel) engine driven generator for a few years. The generator was a 1700 cc twin cylinder unit with hand start and a flywheel weighing several hundred pounds. I had to keep fit to get that to start on a cold winters morning when the oil was thick and the cylinders were cold. Roger.

17 years

SB11

by tshoppa＠wmata.com

Another thought about the SB-11... were those connectors on the back for sending power to a companion TU-58 drive? Is the SB-11 the same form factor as the external TU-58 enclosure? We never used them like that, we had a top-bottom stacked dual 8" drive from... MTI? hooked to our SB-11. Tim.

17 years

SB11

by tshoppa＠wmata.com

Francesca writes: > Anyone know what this puppy is ?? We always called the SB-11 the "Shoebox 11" in our lab, it may have even been the official name. Very small PDP-11 Q-bus system. I think they were in some 70's or very early 80's DECDirect catalogs. > Also in that dir is a weirdo custom ?? VT100 with a tiny 4 inch screen. I am > guessing this all prob sat in some rack at one time. Ah, those are very interesting pictures. I'm pretty sure the CRT and cage and PCB are Ball Brothers units, can you look for stickers with their name? Ball Brothers made CRT+deflection circuitry+ flyback modules used in other equipment, and at one point I even had an IMSAI cabinet with backplane and a Ball Brothers CRT incorporated into the front panel. Tim.

17 years

Subject: Re: substitute for TI TIL306/307 Display?

by rwindham＠chartertn.net

Frank, I saw a post where you had some TIL308 displays. I need some of these for a Yaesu transcever. Do you still have some and what is the price? Regards, Chuck

17 years

FSOT: two Lear Siegler ADM-3A terminals

by dave＠drcircuits.com

Please advise availability of ADM-3 or 3A Terminals. Tnx David

17 years

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test-drb January 2009