test-drb November 1999

test-drb@ccmp.vtda.org

211 participants
749 discussions

11/24 backplane - was Re: Wanted: TK50 Cartridges

by danburrows＠mindspring.com

>I have an 11/24 CPU - do you have the other supporting cards? The 11/24 >backplane? I have a few spare 11/24 CPU backplanes but it will be a while before I can dig one out. Dan

25 years, 1 month

Wanted: Old DEC stuff in Texas

by mrbill＠mrbill.net

Anybody out there within a reasonable driving distance (6 hours?) of Austin, Texas that has any old DEC gear they'd like to get rid of to a good home? I've got a two-car garage thats finished out with carpet and paneling, and I'd like to start that collection of DEC stuff I always wanted. I'm looking for VT1xx/2xx/3xx terminals, MicroVAX/ VAX equipment, PDP-11 (especially) gear, etc. Stuff I've got for sale or trade or donation if you need it bad enough: Six 1200 watter power supplies for a Sun 4/690MP Six 2.1gig SCSI differential FH 5.25" HDs from a 4/690MP Six 1.3gig IPI 5.25" FH HDs from a 4/690MP 16-slot VME cardcage/backplane/blower assembly from a Sun 4/690MP Five 4/330 / 4/630MP deskside VME chassis One SCSI drive shelf and two IPI drive shelves/trays (with slide rails) for a 19" rack Two IBM POWERServer 530 RS/6000 servers, each with 64mb RAM, 2.3gig Exabyte tape drives, one with CD-ROM and 1gig HD, both with IBM 3151 amber terminals. AIX 4.1.3 loaded, with AIX on CD-ROM included. Other stuff like a 16-port serial breakout box, etc. Couple of Toshiba laptops with the orange plasma screen (not sure about the models, I think one's a 3100 and one a 5100; I used them for serial terminals) If anybody's interested in any of this equipment, please let me know. I'd love to see it go to a good home where someone cna get some use out of it, and possibly get something for me to play with in return. Bill -- Bill Bradford * mrbill(a)mrbill.net / http://www.mrbill.net mrbill(a)sunhelp.org / http://www.sunhelp.org --------------------------------------------------------------------- "Never criticize anybody until you have walked a mile in their shoes, because by that time you will be a mile away and have their shoes." -- Unknown

25 years, 1 month

Xerox D-series workstations

by schoedel＠kw.igs.net

Hello all, I've just been fortunate enough to obtain a pair or Xerox D-series machines. One is a 53D (Daybreak? Dove? 6085? 1186?) and the other an 8010. I understand the 53D has its microcode control store in RAM; is there any available information on the microinstruction encoding, and how I might in principle be able to write my own? (I work for a company that did microcode compilers, ten years ago when people still built microcoded machines, so yes, I *do* know what I'm suggesting.) For that matter, is there any available information on the macroinstruction set(s)? So far I've been able to find very little about these boxes. The 53D boots happily into Lisp. Err... could someone please tell me, as soon as possible, how to safely shut this machine off? Two boxes of Lisp manuals, dated June 1997, and still shrink-wrapped. If there is a 'collector' out there who would like to trade for 'working' copies of the same, contact me before I open them.... A carton of Lisp floppies; although these were sold with the 8010, they clearly belong to the 53D, since they're 5.25" not 8". They're marked DS/DD 48tpi; is there anything unusual about these, or could they in principle be read and archived from a current pc? The 8010 doesn't boot. The power supply is fine; the drive spins up and is loud but sounds smooth. The LEDs rest at 0000, and nothing happens. Any obvious things I should try, or will I have to wait until I can do Serious Work on this? -- Kevin Schoedel schoedel(a)kw.igs.net

25 years, 1 month

HP9825 on epay

by lance＠costanzo.net

Picked this off of another list: >Dan B forcefld(a)verinet.com >http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=195400748 >Fort Collins, CO USA - Saturday, November 06, 1999 at >19:28:06 >I just took this thing off my freinds porch and stuck it on >EBAY. Can anybody fill me in a little on its age? I used to >play with HP 9830 computers, I think this is a little >newer-but its hard to say. Its a 9825, with red LED display, >tape drive, and thermal printer, and it comes with a pile of >other junk. Well-its on ebay!~any info that I might add to >the auction would be helpful. Thankyou! Lance Costanzo http://www.webhighrise.com System Administrator Website and Virtual Domain Hosting lance(a)costanzo.net starting at $5/month, no setup fees

25 years, 1 month

Wanted: TK50 Cartridges

by wirehead＠retrocomputing.com

I'm looking for a bunch of TK50 cartridges since local sources have turned up nothing. Does anyone want to unload a bunch? I'm willing to pay for them. Email with details and what you want for them. If nothing else, I'd be willing to trade an 11/24 board set (M7133) and MOS RAM board (M8743) for some. Thanks... Anthony Clifton

25 years, 1 month

VR241 vertical linearity problem

by ard＠p850ug1.demon.co.uk

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25 years, 1 month

VR241 vertical linearity problem

by dburrows＠netpath.net

-----Original Message----- From: Tony Duell <ard(a)p850ug1.demon.co.uk> >The fault is in the vertical scan. The top 2 lines (or so) are spread >out, so that the top row of characters appears to have black lines >running through them. In other words the vertical scan is very non-linear >at the top. I have seen this on many VR241's when the HT supply is about ready to smoke. (literally) I have not taken the time fix them as I normally have a few spares readily available for exchange. I buy them for a LOT less than my time is worth to fix one. (free to $30 - shipping is more than the monitor usually) Dan

25 years, 1 month

VR241 vertical linearity problem

by dylanb＠sympatico.ca

-----Original Message----- From: Tony Duell <ard(a)p850ug1.demon.co.uk> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Sunday, November 07, 1999 12:10 PM Subject: VR241 vertical linearity problem >I'm still working on that Rainbow, and today I've tried it with a DEC >VR241 colour monitor. > >The good news is that the graphics card (and GSX) works fine. And the >graphics are rather impressive compared to the (contemporary) IBM CGA card. > >The bad news is that the VR241 has a fault. I feel somewhat strange >asking this here, as I'm normally the one to answer such questions, but >here goes... Hmmmm > >The fault is in the vertical scan. The top 2 lines (or so) are spread >out, so that the top row of characters appears to have black lines >running through them. In other words the vertical scan is very non-linear >at the top. If part of the picture is cut off with a horizontal line then it is either a video timing problem or a fault in the deflection circuitry preventing the beam from being where it is supposed to scan in enough time. > >Adjusting the vertical linearity control improves things a little, but >reducing the spacing at the top increases it at the bottom. What is odd >is that the vertical position control affects the fault as well -- the >problem gets worse as the picture is moved up the screen. This seems to >rule out a problem with the ramp generator, since the vertical position >control operates by applying a DC current to the yoke. This is likely a vertical deflection problem - possibly a bad capacitor, bad connection, bad flyback/pumpup diode. >The problem gets >better as the monitor warms up. > Ahh,, a dried up electrolytic capacitor is most likely.. if it got a lot worse then it would be a semiconductor. >I've not dived into it yet -- and I suspect the electrolytic in the >vertical output stage. I am wondering if anyone's seen this before and >can suggest a possible cause. > Easiest thing to do is substitute a good capacitor for each electrolytic in the vertical output circuit. (if you don't have a scope). If you do have a scope then work your way through the vertical output circuit and locate the problem. john >-tony >

25 years, 1 month

Tandy 2000

by jrice＠texoma.net

I was given a Tandy 2000 recently. Due to the death of my mother this week I just tried to boot it. It puts the 256k memeory message on the screen and the floppy drive light comes on but it never seems to boot. I recieved a boot disk copy with the machine and have ordered a MSDOS/Basic boot disk from RSU but no resultds. Any common prblem I should look for? I've already reversed the floppy drives with the same results. James -- ICQ 2286850 Home Page http://home.texoma.net/~jrice Classic Comp Page at http://home.texoma.net/~jrice/classiccomp.html Robotics Page at http://home.texoma.net/~jrice/hobbies.html All pages under construction!

25 years, 1 month

Priority for a QDSS color framebuffer?

by mbg＠world.std.com

>Where is the color frame buffer normally placed relative to everything >else in a Vaxstation II/GPX ? (everything else being defined as ethernet, >TQK70, disk, and async muxes) According to the Vaxstation II/GPX hardware manual, the correct sequence of boards is: 1) CPU 2) Memory 3) Ethernet interface 4) VCB02 base 5) VCB02 memory 6) VCB02 memory 7) Async comm (DZQ) 8) Asyn multiplexor (DHV) 9) Sync Comm (DMV) 10) Disk controller (RQDX3) 11) Tape controller (TQK50) But I have always placed the disk controller after the ethernet interface and before the VCB02... it puts the controller electrically closer to the CPU, which should make disk I/O a little faster (I know, almost infinitesimal, but the delay has got to be measurable, and adds up over time). 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, 1 month

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test-drb November 1999