test-drb July 2005

test-drb@ccmp.vtda.org

257 participants
628 discussions

by cc＠corti-net.de

Hi everyone, I am still looking for information about an IBM card punch which I thought was some variant of an IBM 029. I've found out that this must be an "IBM 545 input output card punch". So, has anyone any information about this punch? (Pictures are on http://computermuseum-stuttgart.de/dev/tmp/ibm029.html) Christian

18 years, 11 months

Intercept (6100) PDP-8 compatibility?

by ajp166＠bellatlantic.net

> >Subject: Intercept (6100) PDP-8 compatibility? > From: Tom Jennings <tomj at wps.com> > Date: Thu, 07 Jul 2005 23:04:59 -0700 (PDT) > To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> > >I know the base instruction set is right but I'm fairly sure the >IO structure is radically different, but -- > >What peripgherals and OS software is available for, or runs on, >the Intercept? (Not the Jr board, the rack-mount job). > >I'm thinking it might make a comfortably modern old machine... > You can run most base PDP-8 software. The small difference is the console IOTs are differently assigned but easily fixed in the code. Its the side effect of their IO devices. Allison

18 years, 11 months

VAX 3400 available in Alabama

by ed＠groenenberg.net

Available in near/in Huntsville Alabama, a VAX 3400 + extra's. Please contact him using the email address below. ====== >On Fri, 8 juli, 2005 10:12 pm, wcrouch at cwcinc.net said: > > > > ... Interested in a MicroVax 3400 system > > (multiple drive towers, BA 11/K unibus chassis - > > with interface cards for connecting with the > > MicroVax, multiple xterms, line printer, tape > > drives, documentation, ...)? > > It was the control computer for a multi-gigabit > > per sec Aptec crossbar I/O system. > > > > I also have the aptec. It uses ECL logic, so the > > power supply is 2v at around 1000 amps. 'Makes a > > nice spot-welder! > >

18 years, 11 months

IBM Punch Cards

by jrkeys＠concentric.net

Well pulling out my Hero-Jr robot for some photos I noticed the two card sample booklets I go a few weeks ago. There seems to be over 300 different card stock samples in the two salesman booklets. One is called "general Purpose Card Sample IBM Data Processing Cards" form # 570-0275 9-67 and the other is "IBM Standard stock card formats" form # 570-0440 from around 1970. I had no idea of all the many card formats IBM had.

18 years, 11 months

11/45 is alive (I'm singing "who's johnny")

by jwest＠classiccmp.org

The /45 lives, got a console up with the console emulator today. I never did get a blinking lights program to show up right, but I'm too embarassed to admit what likely caused that. But I got a lot of other few instruction programs to work correctly so I moved on to the DL11 and 9312 setup and got it all working. Only have 8K of core, but hey, it's a start. Once I get it to boot from a peripheral I'll take out the loaned cpu set and move mine back in and see where it chokes. So now I have a few peripheral questions. I was going to put in an RL02 drive, but I've been advised against putting one in the same cabinet as the cpu cab is top cooling intake :\ Now I'm moving on instead to hooking up and testing a LincTape II and a DSD440 drive. I found the docs for the DSD440 drive on bitsavers; my drive is missing the controller to drive cable. From those docs it appears to be a straight through 2x13 pin berg connector at each end. Can anyone confirm this? Also, If the DSD440 drive is set for RX01, will it work with the standard dec boot rom (DX) on the 9312? Likewise, if it's set for RX02 emulation will it work with the DY boot room on the 9312? Or does the DSD440 need a unique bootrom? I also have the LincTape II & controller (&cable), model CO-3000D. However, I don't see any docs for it on bitsavers and my googling gives tons of stuff on the Linc, not the LincTape II. Does anyone have docs for the LincTape II in electronic format? Or better yet... a boot rom for it :> I have spare boot roms (DP, RP02/03 and DM, RK06/07) that I doubt I'll ever use and would be available for trade. Thanks! Jay West

18 years, 11 months

RA81 slides??!##@$

by jwest＠classiccmp.org

If someone knows the magic to pull a RA81 out of a rack and off the slides completely, I'd love to know it! I have two in the other H960 that someone mounted backwards in the rack :\ I pull the drive about halfway out and to get it further, flip up the "rocker" catches under the rail. Then it comes all the way out and clicks to a stop. Most rails I've seen... you have to get them about 3/4 of the way out and then a screw will appear in a hole that you have to take out. These slides have that hole but the screws are already out. What obvious trick am I missing? Jay

18 years, 11 months

FA: Lots of DEC (&Plessy and MDB) manuals and core memory

by rigdonj＠cfl.rr.com

I just finished putting a bunch of DEC manuals and a complete core memory sub-system on E-bay. I have LOTs more to add as time permits. <http://search.ebay.com/_W0QQsassZrigdonj> Joe

18 years, 11 months

DEC 11/45 build - advice sought, parts requested possibly.

by aek＠bitsavers.org

> 1) How unobtanium are the parts necessary to bolt the two H960 racks > together? IIRC, it's just 8 nuts and bolts. Or at least that's what I used to fix the 2 racks of my 11/45 system together. -- There are supposed to be two black filler strips, orig metal and later of plastic, roughly .5" x 2 " x 6 ft between each rack. The one that goes on the front has a slot to allow space for the magenta/wild rose top panels.

18 years, 11 months

Replace roller rubber on HP 9825 tape drive

by dwight.elvey＠amd.com

>From: ard at p850ug1.demon.co.uk > >> >> On Thu, 7 Jul 2005, Dwight K. Elvey wrote: >> >> > I'm not sure how it works. The 10% number is not even >> > close. It is more like 0.5% or so. It does take up slack >> > over time. I think it has to do with the stretch of the >> > belt. There is more tention on one spool than the other, >> > making one side move a little faster than the other. >> > The one spool getting the more stretched belt would tend >> > to move a little faster than the side without stretch on >> > it since it would see more effective belt movement. >> >> I would think that the faster spindle has a smaller diameter than the >> slower one. > >Yes, but remember the belt drives the outide of the tape on the 2 spools. >Yes, the smaller spindle will turn quicker (more revs per second), but >to tension the tape you need to move the tape faster (more inches per >second) on the takeup side. And I still don't see why this happens. > >-tony > Hi Tony I'm proposing an experiment for you since I know that you are the type that would actually try it. Get two pulley or spools ( like from thread ) that are the same diameter. Place these on shafts that give you a few inches between outer edges. Get a rubber band that is large enough to go around the two spools, with some tension. Mark the spools with an arrow so that you can see how fast each rotates. For convenience, spools should be left and right. Now place a little drag on the left spool while pulling the rubber band from the lower span of the rubber band, towards the left. This would correspond to how the tapes are in the cassette. Although, the spools are the same size, I've only done this so that the surface speeds of the spools would match if a rigid belt were used, similar to the tape surfaces. As you pull the rubber band, you'll notice that the right spool rotates noticeably faster than the left spool, even though the rubber band is not slipping on the left spool. This demonstrates the principle of the way the cassette works ( or at least should ). I do hope you try it. Dwight

18 years, 11 months

cctech Digest, Vol 23, Issue 16

by mross666＠hotmail.com

Subject: Re: Take My Warehouse, Please! >At 12:01 PM 7/8/2005, Vintage Computer Festival wrote: > >And here are photos so you can see what you're up against: > > > >http://www.siconic.com/crap/Warehouse/ > >Ah, thank you. I will rub these pictures like cool smooth stones >against my temples when I need to reassure myself that >"I may think I have a lot of junk, but at least I'm not as crazy as Xxxx." I have to say, I thought that was a piss-poor collection. Seriously unimpressed. A warehouse full of 'stuff', but there wasn't a single machine that I couldn't *pick up*... :-) Mike http://www.corestore.org

18 years, 11 months

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test-drb July 2005