test-drb November 2005

test-drb@ccmp.vtda.org

255 participants
692 discussions

Connecting a BC80M cable to a RLV12 controller

by Useddec＠aol.com

Hi David, I don't type very well, but I can talk you through this on the phone. Is there a good time to call you or would you prefer to call me? It won't matter to my phone bill. Thanks, Paul

18 years, 8 months

Switch-Mode PSU Failure Modes, Repairs, & Parts Substitutions

by slasor＠jfs.go-plus.net

Hi, I have 3 Patriot book pc psu's which I want to get repaired. regards J.F.Slasor

18 years, 8 months

VCF 8.0 Pictures

by ajp166＠bellatlantic.net

> >Subject: Re: VCF 8.0 Pictures > From: Doc Shipley <doc at mdrconsult.com> > Date: Thu, 10 Nov 2005 16:33:21 -0500 > To: General at mdrconsult.com, "Discussion at mdrconsult.com":On-Topic and Off-Topic > Posts <cctalk at classiccmp.org> > >Allison wrote: > >> Well for one, I insist that you also have a supply of beefcake >> for us geeky girls. Fair is fair! ;) > > Ahem. Aging, bald, bespectacled, spreading geek men aren't beefcake >enough for ya? > > > Doc Well, you old farts look at the girls. What's ya think us girls are doin? Allison

18 years, 8 months

Discharging a VT100 CRT

by dwight＠ca2h0430.amd.com

>From: ard at p850ug1.demon.co.uk > >> CR408 is a 1A 400V diode (1n4006 should do) > >Is there any reaosn not to use a 1N4007 here as well? I generally don't >buy the other IN400x's as I've yet to find an application where too high >a PIV is a problem. > >-tony > Hi The only issue I know of is slightly slower commutation time. Not even noticeable for 50Hz or 60Hz. Dwight

18 years, 8 months

VCF 8.0 Pictures

by ajp166＠bellatlantic.net

> >Subject: RE: VCF 8.0 Pictures > From: "Hans Franke" <Hans.Franke at siemens.com> > Date: Thu, 10 Nov 2005 16:10:46 +0100 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >Am 10 Nov 2005 15:52 meinte Gooijen, Henk: >> > Am 10 Nov 2005 9:09 meinte Gooijen, Henk: >> > > There is a second picture of the "hot geeky blond girl" >> > > which promotes her to "hot geeky blond 'nice legs' girl" :-) >> > > If I ever go to a VCF (in Germany), I must hire one of those >> > > girls you see on the bonnet at car shows. It will not matter >> > > what old stuff I exhibit, *my* stand will be visited most! :-) > >> > I have to see that ... your booth at VCFe 6.0 is reserved :) > >> Yes, I am giving it serious thoughts! >> Do you provide the girlz, Hans? Would be an BIG incentive! :-) > >Well, we usualy employ one official hootie for VCFe, although >I'm not shure for next year. Well for one, I insist that you also have a supply of beefcake for us geeky girls. Fair is fair! ;) >> On display I can have: >> 2) Homebrew pdp8/e running (slow) OS/8 or DMS Howbout a 6120 homebrew running OS8? The trick was real DEC style IO rather than PIEs and cruft that leads up to os78 and os278. >> 3) PDP-11/03, a real one for a change :-) decoding HAM radio RTTY I've used the -11 for RTTY display. You only need a modem to decode the tones though having spilt screen, upper for incomming and lower for outgoing text. I'd like to see PSK31 software for the -11. Allison

18 years, 8 months

Discharging a VT100 CRT

by ajp166＠bellatlantic.net

> >Subject: RE: Discharging a VT100 CRT > From: "Julian Wolfe" <fireflyst at earthlink.net> > Date: Thu, 10 Nov 2005 00:13:50 -0600 > To: "'General Discussion: On-Topic and Off-Topic Posts'" <cctalk at classiccmp.org> > >Well Well Well. > >On closer inspection, it is very clear that the cap is what blew (it's >exploded and blackened on one end) is at C439, and the diode is CR408. The >diode description in the maintenance print is aggravatingly overwritten by >the entry above it as it ran over. > >The cap is a 75MFD, 6V, +75-10% Electrolytic cap > >Where should I go from here? Well thats a horse of a differnt color. CR408 is a 1A 400V diode (1n4006 should do) the cap is what it is. and should be replaced. The easy test is replace the diode and cap and see if it works. if cr408 or R478 get hot (not warm) then other problems exist. Allison

18 years, 8 months

help - 11/34 console problem -- CNTRL key behaviour

by henk.gooijen＠oce.com

Tony wrote: > > just a short question, I have seen so much that I start doubting > > everything :-( After you pressed the CLR key on the 11/34 > > console (to get a clear start point), if you *only* press the > > CNTRL key, nothing should happen, right? > > Right. The CNTRL key is a bit like a shift key, and should do > nothing on its own. > > > To answere one of your other posts, I would expect data to be > written ot the display latch quite frequently (of the order of ms) > _but_ the write pulse will be narrow (a few us at most), and if > you've got the analyser set up to sample for long enough to display > several display scans, you might well miss some of the write pulses > because they occur between analyser samples. I think the K100D has > 'gltich capture' for just this sort of problem, try selecting it for > the input you use for the write pulse. > > -tony Ok, so the CNTRL key behaviour analysis is a good point to start with. Yesterday evening I checked the latch that gives the NUM 1-2-3 signals, and the buffer that is behind it. The in- and output signals are OK, although it is *constantly* '110', which matches the display value "666666". On the LA (set to sample at 1 msec) I did see *one* pulse on the CLK pin of the latch. My guess yesterday evening was, that is not correct as just *one* pulse in 1000 msec is way to low for a good refresh rate, just as you say Tony. It did not occur to me that the single pulse was "by luck" detected by the LA. If the LA sees *one*, I should see more, I'd guess. I do remember that I had to turn up the brightness control of the scope to see the thin CLK pulses ... I will put a picture on the webpage tomorrow. The battery of the camera is recharging. Your initial remark about a failing RAM chip is still in the picture, as the value to display is taken from the first 3 locations of the RAM. BTW, the operator/maintenance manual has an error in the memory allocation. It shows that the first byte is for the display, but it is actually the first 3 bytes. So the rest of the picture can not be correct either ... The assembler source listing proves this. Every time a digit must be set on the output port, the 3 memory locations are shifted 3 bits. That means with 6 digits, that at the end the total shifted bit count is 18. The code corrects the value in the 3 memory locations by shifting 6 bit positions when the complete 6 digit number is sent to the output port. I am getting tempted to install the totally dead M7859, and have a look at it, with the new knowledge build up from this module. May be its is just a defective 8008, but I am afraid that if I get the dead M7859 working, this weird defective one will end up on the pile of things "I must do, when I get the time" ... But I will first inspect the two RAM chips! 4-bit data in, 4-bit data out, 4 address bits, one select pin and one clock pin (the WE* pin is tied to GND). Should be possible to see it all with the 16 channels and make a conclusion of the RAM's condition. You might have been correct from the beginning, Tony! thanks, - Henk, PA8PDP. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.

18 years, 8 months

Ultrix for DECstations

by ajp166＠bellatlantic.net

> >Subject: Re: Ultrix for DECstations > From: Adrian Graham <witchy at binarydinosaurs.co.uk> > Date: Thu, 10 Nov 2005 19:02:27 +0000 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >(The only load media on this big-iron VAX is a TZ887 tape library so I'm >going to install VMS onto the boot disk by plugging it into a VAX 3100-90 >with a BA350 storage shelf then all I have to do is put that disk into the >6660's HSJ50-powered storage array and boot it......try doing THAT on any >other OS :oD VMS is VMS is VMS.....) > >A I've done that for years using RD54s and then SCSI disks, easiest way to do a VMS install for 20 systems. Do it once then clone the drive, doent matter what the system varient was so long as it can interface to the drive. Beat the tar or hackup out of using TK50. Allison

18 years, 8 months

Software find

by ajp166＠bellatlantic.net

> >Subject: Re: Software find > From: Adrian Graham <witchy at binarydinosaurs.co.uk> > Date: Thu, 10 Nov 2005 19:14:10 +0000 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 9/11/05 23:04, "Dan Williams" <williams.dan at gmail.com> wrote: > >> For the 380z Sbas, bcpl (4 disks), txed, zasm, cp/m 2.2 and 1.4 and Wordstar. >> For the Nimbus Windows 1.01 (Which I've never seen), write 2.0, >> various version of RM basic and Msdos 3.05. >> I'd like to see windows booted up the earliest version I've seen is >> 2.x (can't remember). > >I've got 2 Nimbus' but no monitor for either of them, though there's another >machine plus a monitor waiting for me in north wales if I can ever get over >there to pick it up (or Lee D. can if I can get the address :o)) > >Wouldn't mind seeing windows 101 myself, though it's just a glorified >DOSSHELL running on top of DOS 5. 'ugly' doesn't do it justice! > >A Then again so was V3.11. It was dos. Allison

18 years, 8 months

VCF 8.0 Pictures

by classiccmp＠vintage-computer.com

I've just finished putting up a quick page for my VCF 8.0 pictures. There are no descriptions yet (any help would be appreciated - let me know if you recognize folks, items or whatnot) but I'll hopefully get to them soon. Enjoy! http://www.vintage-computer.com/vcf8.shtml -- Erik Klein www.vintage-computer.com www.vintage-computer.com/vcforum The Vintage Computer Forum

18 years, 8 months

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test-drb November 2005