test-drb March 1999

test-drb@ccmp.vtda.org

191 participants
1003 discussions

by allisonp＠world.std.com

<> Anyone with a schematic? This one is the rear mounted style with the <> cover that says, do not operate with cover removed for more than 15 <> minutes. Don't need the whole prints but only some things verified. <At the risk of sounding like a complete and utter moron, why can't you <operate for more than 15 minutes with the cover removed? Because the power supply would overheat and there is a thermal switch to shut it down. Allison

25 years, 9 months

id this Xerox

by g＠kurico.com

Ran across a Xerox today but couldn't find any identifying labels. It's a desk side sized (1' wide x 2' high x 3' deep), has a single 8" floppy above a control panel with a bottom hinged door. On the back, the connectors are on a separate little platform type thingy, on one side it has a printer, transceiver, and a db25 labeled LEUP. On the other side it had a db25 labeled display, a keyboard, and a "rigid disk" connector (and a plug that looks like it powers the drive). Anyone know what this beast is? TIA George

25 years, 9 months

Timonium Hamfest

by mbg＠world.std.com

>6 IBM PC Convertibles. Last summer I purchased about a dozen IBM PC >Convertible AC adapters at a hamfest for $1, knowing that some day I'd >come across a pile of Convertibles at a Hamfest, lacking power supplies. >Well wouldn't you know there was a stack of Convertibles at the Timonium >show - and not one of them had an AC adapter. If anybody's interested in >one of these, figure about $25. If any of them have a back-lit display, I'm interested. (Even if not, I'm interested, contact me off-list). Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

25 years, 9 months

Help: root password for System V/i860

by ss＠allegro.com

Re: > >I just picked up an i860 box, which has System V on it ... and I don't > >know the root password. If I interrupt the boot cycle at the start, I'm still trying to figure this one out. "boot" and "boot -s" and "boot -fubar" all get me to: mboot enter name of the kernel to boot: (i.e., "boot" doesn't appear to have any parameters, or else it's doing a darn bad job of parsing the input ... computers should *always* complain about unused/extra input from a human on a command line :) So, in the "boot" dialog, if I hit <return>, it boots to "unix" (and requires a regular login, which I can't do) If I enter "unix -s", or "unix s" or "-s unix" or "unix -ss" or "fubar" , it says: Boot: Cannot load XXX: file not opened where "XXX" is whatever text I entered (e.g., "unix -ss" or "fubar") If I can't get past this, I'll try mounting the hard drive on a Unix machine somewhere, to see if I can find/edit /etc/passwd. Stan

25 years, 9 months

PDP-11/34A rebuild project Was: Re: Post-move diary

by mbg＠world.std.com

>That sounds like the cache+FPU connector, and it's used like you said. >There's a second connector with a different number of pins (I forget the >details) that you _also_ need. It links the FPU to one of the CPU boards. >So in the end there are 2 top connectors on the FPU and one of them also >goes to the cache. Then I've found them both... unfortunately the boards don't work. One has one of the red FS toe-tags on it. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

25 years, 9 months

Post-move diary

by mbg＠world.std.com

>IIRC in an 11/34, the power connectors are at the A-end of the backplane. Come to think of it, I think you're right... confirmed by the fact that the grant cards go in the D slot, which is the fourth from the back of the chassis... >It wouldn't be hard to make up the harness. It does have 2 connectors on >the PSU end (15 way for power and 6 way for LTC/ACLO/DCLO). The VT11 does >use LTC IIRC to sync the display to the mains and reduce flicker. I guess I could make a harness if I can't find the one which already has one... I'd like to have the printset so I can make the cable lengths correct, and so I have the part numbers for the connectors... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

25 years, 9 months

PDP-11/34A rebuild project Was: Re: Post-move diary

by pete＠dunnington.u-net.com

On Mar 30, 17:01, Megan wrote: > Subject: Re: PDP-11/34A rebuild project Was: Re: Post-move diary > > >I believe you can put an MUD or SPC card in slot 5 if you don't have the > >cache. I can't remember what happens if you don't have the FPU - either > >slot 3 is also an SPC slot (I think that's the case) or you move > >everything left one slot (Which I think is not the case). Slot 3 is SPC; you *must* put the two main CPU cards in the rightmost two slots. > First step will be to remove everything from the backplane and > vacuum it out... When you've removed all the disintegrated foam-that-used-to-be-front-panel-filter, you might want to replace it with something less prone to aging. I found the synthetic fibrous filter material sold for cooker hoods (over-the-stove extractor fans) works very well, and you can tear it into half thickness for lighter duty. -- Pete Peter Turnbull Dept. of Computer Science University of York

25 years, 9 months

PDP-11/34A rebuild project Was: Re: Post-move diary

by mbg＠world.std.com

>I believe you can put an MUD or SPC card in slot 5 if you don't have the >cache. I can't remember what happens if you don't have the FPU - either >slot 3 is also an SPC slot (I think that's the case) or you move >everything left one slot (Which I think is not the case). I just realized that one of the connectors I did find was one which appeared to connect over-the-top with two boards. The other one I found has three connectors, and the spacing between 1 and 2 is different from that between 2 and 3... I presume it is because 1 and 2 connect to the CPU and FPU in slots 2 and 3, and the third needs extra space to connect to the Cache in slot 5... I may just have what I need to get that working... First step will be to remove everything from the backplane and vacuum it out... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

25 years, 9 months

#029 variants (was: IBM 557 Alphabetic Interpreter??

by pete＠dunnington.u-net.com

On Mar 30, 14:14, Fred Cisin (XenoSoft) wrote: > Subject: #029 variants (was: IBM 557 Alphabetic Interpreter?? > In addition to the rare "Interpreter punch", there was also a quite a bit > less rare variant, the "Verifier". It would READ a card as the operator > typed. If the card and keyboard didn't match, (IIRC after a couple of > tries) it would put a notch in the top of the card at the point of > discrepancy. If everything matched, it would put a notch in the side of > the card, as testimony to it having been checked. Yes, we had a few of those -- almost all reserved for "specialist operators". -- Pete Peter Turnbull Dept. of Computer Science University of York

25 years, 9 months

Epson HX-20 EPROM programmer???

by rigdonj＠intellistar.net

I have an Epson HX-20 with an EPROM programmer built on. See it at "http://www.intellistar.net\~rigdonj\hx20.jpg". Does anyone know anything about this? The case for the EPROM programmer is made of the same material and is the same color as the Epson case and has the name "Motorola" cast into it. It's held on with a steel bracket underneath. Someone went to a lot of trouble to make this. There's also a ribbon cable (?) cconnector in the top corner. Any idea what it was used for? There are also "Motorola" marked EPROMs in the socket sin teh bottom of the HX-20. Any idea what this machine was used for? The batteries in it are dead and I haven't had time to get it working yet. Joe

25 years, 9 months

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test-drb March 1999