test-drb January 2006

test-drb@ccmp.vtda.org

240 participants
511 discussions

Common items you passed up that turned rare when you wanted them

by dwight.elvey＠amd.com

Hi No, even the tube may be revived some. You can often run the heater at a higher voltage for some time and check the emission periodically. Usually, you can safely run the filament at 1.5 to 2 times the rated voltage for 5 or 6 hours. It is usually done with no cathode current while at the higher voltage and then return to normal levels to check for the current. It would help to have a tube tester but I suspect that just measuring the voltage drop across a resistor in the cathode circuit someplace would tell if there was any improvement. You graph the increase in current. At some time, you don't get any improvement so you stop there. No sense wasting the filament. You could control the voltage with a variac and a transformer. Do make sure that the tube is the cause. Raised voltage on the filament can shorten the life of the filament and at times cause cathode to filament shorts. If the image is well focused and not over sized, the main rail voltages are OK. Dwight >From: "Richard" <legalize at xmission.com> > > >In article <200601311927.LAA29559 at ca2h0430.amd.com>, > "Dwight Elvey" <dwight.elvey at amd.com> writes: > >> >[...] I do have one monitor. I haven't tried >> >to power it up, but written on the case is the word "DIM", presumably >> >identifying a failure in the monitor somewhere. I've never repaired >> >monitors, so I'm not sure what a dim image is suppose to indicate. >> >Failing HV drive circuitry? >> >> Hi >> HV would cause blooming of the image. Dim image is weak cathode >> in the tube or problems in the circuits controlling the cathode >> to gate voltage levels. >> Dwight > >So... if its the tube, there's nothing to do but replace the tube? >Egads... I wonder how hard it would be to find a compatible >replacement. >-- >"The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ: > <http://www.xmission.com/~legalize/book/> > Pilgrimage: Utah's annual demoparty > <http://pilgrimage.scene.org>

18 years, 9 months

RL01 imaging

by aek＠bitsavers.org

I have no idea if RT-11 has a native utility that permits making a disc image. -- copy/device with one other option I don't remember off the top of my head ----- > I notice there aren't any RL01 disk images up there. -- PDP-11 software is still being sold (in theory..)

18 years, 9 months

RX02 emulator?

by doc＠mdrconsult.com

Has anybody built and used Peter McCollum's Qbus RXV11 emulator? http://www.geocities.com/saipan59/dec/rxv11_emu.html I saw that somebody on CC is running the Unibus version, and it got me curious. Doc

18 years, 9 months

OT: seeking: MPG3102AT (in UK)

by classiccmp.org＠irrelevant.fsnet.co.uk

Hi all. Sorry it's only 5 years old, but I'm trying to find an Fujitsu 10Gb IDE hard drive, model MPG3102AT, in order to rescue data off the one I have here. I gather that these have a fairly common fault that something in the board goes, causing it to disappear as far as the PC is concerned. We had a power cut this morning, and when it came back on, the drive wasn't found... I've already tried swapping it with the apparently identical board off a MPG3204AT however that's a 20Gb drive, and it just clunks a lot when on this mechanism; presumably there is a setting somewhere that means it's looking for more heads or something. Sadly, I'm not up to component level or firmware debugging on these things. Unfortunately, speed is of the essence here.. so if there's anybody in the UK with one of these, surface condition immaterial, that would be willing to let it go, please get in contact. Naturally I'll cover any costs, collect, replace with something similar or bigger, etc. Once i've got my data, you can even have it back.. Cheers, Rob.

18 years, 9 months

Just won HP 4952A / HP 18179A protocol analyzer/serial adapter

by rcini＠optonline.net

All: I just won this protocol analyzer (with the 002 option which is the extended memory option) on eBay. Does anyone have a PDF of the manual and disk images (or pointers thereto)? Thanks!! Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: <http://highgate.comm.sfu.ca/~rcini/classiccmp/> http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/

18 years, 9 months

IBM Quick Reference Guide - 1992

by tosteve＠yahoo.com

I found this interesting - The IBM Personal System/2 Quick Reference Guide from 1992. It contains List as well as Educational (NEP) prices for hundreds of systems and components. Maxed-out PS/2 model 75 - only $11,295! (486, 33MHz, 8MB, 400MB) 38 JPEG images - very large in size - sorry, no PDF! http://members.cox.net/oldcomputerads/QRG/QRG.html Steve. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

18 years, 9 months

You Won eBay Item: DEC RL1 Diagnostics on RL-01 disk cartridge (8755900616)

by legalize＠xmission.com

Woo hoo :-). How would I go about creating a disk image of this for bitsavers? I notice there aren't any RL01 disk images up there. What nifty things can I tell about my RL01 drives with this pack? -- "The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ: <http://www.xmission.com/~legalize/book/> Pilgrimage: Utah's annual demoparty <http://pilgrimage.scene.org>

18 years, 9 months

VAXstation drive sled description

by compoobah＠valleyimplants.com

I have a VS3100/76 that did not come with any drive sleds. I would like to fabricate a replacement, but I haven't been able to locate any in-depth descriptions or pictures of the sled. Does anyone have a description or picture? I'm not sure if it is screw-on bosses like Sun Aurora chasses use for the CD/Floppy or if it is a solid sled with the bosses included.

18 years, 9 months

have an extra M105 + M7821 unibus card?

by Useddec＠aol.com

Hi Brad, They were very common in older unibus controllers. I may have some around here. I do have rx01 and 02 interfaces if you need them. Thanks, Paul

18 years, 9 months

ESV peripheral data concentrators available

by legalize＠xmission.com

On the odd chance that anyone else out there has an Evans & Sutherland ESV workstation and would like an RDC peripheral concentrator (multiplexes keyboard, mouse, dials box and button box into a single RS-422 line), let me know. I have two, but they are missing the 68000 DIP control processor. Otherwise they are in mint condition. It should be easy to find 68000 chips to plug into these puppies. This means you can have your noisy ESV in another room while you sit in comfort in a quiet work area :-). -- "The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ: <http://www.xmission.com/~legalize/book/> Pilgrimage: Utah's annual demoparty <http://pilgrimage.scene.org>

18 years, 9 months

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test-drb January 2006