test-drb May 2019

test-drb@ccmp.vtda.org

149 participants
165 discussions

by mark＠meba.com

I have an old daisy wheel printer by Hewlett-Packard, their 2601A. We got this from an estate cleanout and I would like to sell it. It has been powered up and the power light comes on and the carriage moves to the starting position. It is a large, very heavy machine. I have it on ebay for $150 (https://www.ebay.com/itm/223533138720) but that was just a shot in the dark. There is a better description and more pictures in the listing. Any reasonable offer considered. I have no way to ship this item from here but will drop it off at the ups store. The buyer will have to make their own arrangements for packing and shipping with ups. Mark mark at meba.com

4 years, 10 months

Abandoned FACOM system in Italy?

by evanlinwood＠hotmail.com

Andrea (Brent & Glen) Nice work spotting the factory .. Needless to say, it might not even be possible to do anything, but hopefully someone takes an interest!

4 years, 10 months

11/93 rebuild - Major and Significant Result.

by rodsmallwood52＠btinternet.com

Hi ???? Due to the help from Glen Slick. (The only guy to answer the question as asked.) ???? What to do is interesting. How to do it will get you there. I now have a SCSI drive on the 11/93 that thinks its an RD54 and is trying to boot RSTS/E. It fails gracefully during the boot? giving an error message. So we have a working Hard Drive and Controller on the target system. No to find out what it does not like. The transfer rig is now working OK. So I can try out more drives if needed Rod --

4 years, 11 months

11/93 rebuild

by jnc＠mercury.lcs.mit.edu

> From: Holm Tiffe > You have to have an already existing parition structure on the disk and > an OS that knows what todo with that. The "--list" command to 'dd' gives a whole bunch of stuff: Win32 Available Volume Information \\.\Volume{cd4ae459-0daa-11e2-9625-806d6172696f}\ link to \\?\Device\HarddiskVolume1 fixed media Mounted on \\.\d: \\.\Volume{f3c65dd6-01af-11e1-a511-806d6172696f}\ link to \\?\Device\HarddiskVolume2 fixed media Mounted on \\.\c: \\.\Volume{f3c65dd7-01af-11e1-a511-806d6172696f}\ link to \\?\Device\CdRom0 CD-ROM Mounted on \\.\m: \\.\Volume{a531c21e-b869-11d9-9977-806d6172696f}\ link to \\?\Device\Floppy0 removeable media Mounted on \\.\a: \\.\Volume{89bdc974-217e-11e8-96f6-00038a000015}\ link to \\?\Device\Harddisk2\DP(1)0-0+7 removeable media Mounted on \\.\e: NT Block Device Objects \\?\Device\CdRom0 size is 2147483647 bytes \\?\Device\Floppy0 \\?\Device\Harddisk0\Partition0 link to \\?\Device\Harddisk0\DR0 Fixed hard disk media. Block size = 512 size is 20020396032 bytes \\?\Device\Harddisk0\Partition1 link to \\?\Device\HarddiskVolume2 \\?\Device\Harddisk1\Partition0 link to \\?\Device\Harddisk1\DR1 Fixed hard disk media. Block size = 512 size is 10262568960 bytes \\?\Device\Harddisk1\Partition1 link to \\?\Device\HarddiskVolume1 \\?\Device\Harddisk2\Partition0 link to \\?\Device\Harddisk2\DR6 Removable media other than floppy. Block size = 512 size is 15833497600 bytes \\?\Device\Harddisk2\Partition1 link to \\?\Device\Harddisk2\DP(1)0-0+7 Removable media other than floppy. Block size = 512 size is 15829303296 bytes some of which appear to be entire disks, not partitions. Since I was trying to write into a specific area of an SD card connected via a USB adapator, I took the path which seemed to be that of least resistance, which was to use a partition which covered the blocks I wanted to write. If I needed to write the boot block (which contains the partition table), I'd have probably tried using some of the other devices in the list, but since I didn't need to, I decided not to get diverted from my real goal by trying other devices. Maybe it won't work for what he needs to do. But it worked fine for me, doing something very similar, so I thought I'd mention it. Noel

4 years, 11 months

"industrial" PDP-11

by jules.richardson99＠gmail.com

Hey all, I bumped into someone who has some early (mid 1970 on some of the photos I've seen) PDP-11 bits - front panel and a handful of boards (the backplane, PSU, rack, peripherals etc. are long gone). The front panel's branded as "Industrial 11" though, which isn't something I've seen or heard of before. Address bus is 16 bits wide, and aside from the branding, the style appears to be the same as an 11/05 or 11/10. Were there any differences to the system internally though, or in the standard set of boards fitted, or was the "industrial" aspect purely a marketing exercise? cheers Jules

4 years, 11 months

IBM lifting tool

by evanlinwood＠hotmail.com

> Their closest current product looks like the Genie Load Lifter. I saw the name also but didn't think to search :) - some great looking units there.

4 years, 11 months

IBM lifting tool

by evanlinwood＠hotmail.com

> I bodged together my PDP-Lifter that's a nice piece of bodging!

4 years, 11 months

M7264 Troubleshooting

by jnc＠mercury.lcs.mit.edu

Hi, sorry about the delayed reply; been dealing with this: http://ana-3.lcs.mit.edu/~jnc/jpg/backoak/WholeTreeS.jpg The cranes arrive tomorrow... > I took a look at all the lines you mentioned. BDAL3-13, BDIN, BSYNC, and > BBS7 are all active and jump around in some manner. Hmm. Well, that shoots down the simplest theory; that a CPU BDAL (or perhaps BDIN) driver (technically, a transceiver) chip is bad; if you're seeing any activity at all on a line, the driver must be working. So, either both console cards have an issue, or something more complex is going on. Here are some pictures to show you what you should be seeing, and what I'm seeing with an LSI-11 with no console card. First, normal operation: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/BSYN-BDAL_OK.jpg The top trace is BSYNC, the bottom BDAL10 (which should be asserted for 0177560, the console CSR's address; it's the 02000 bit). The timebase on this one is 1 usec per division. As you can see, it's in a tight loop reading that register. The QBUS spec shows that for a DATI cycle, the DAL lines are set up before BSYNC is asserted (falling edge here, since the bus lines are inverted). BDA10 is indeed asserted (low) when that happens; shortly after it goes back to 0 (high) so that device can put its data out on those lines. It stays high, so that bit in the CSR must be 0. OK, now a picture of the bus with no console card: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/BSYN-BDAL_NoCon.jpg It's a bit hard to interpret what's going on here (note that the timebase is much larger - 5 usec). The long assertion of BSYNC is undoubtly the CPU trying to get the console CSR to respond, and eventually timing out. Not sure what the short assertion following it is - without looking at the ucode for the ODT, there's no way to know what the CPU's doing. Even harder to understand is what the BDAL line is doing. It looks like it's un-asserted (0, i.e. +3V) on the falling (electrically - rising, logically) edge of BSYN (which would be incorrect - see above). And then it hops around while BSYNC is asserted, which makes no sense at all to me. At this point, my best guess at the most likely cause of your problem (given the 'all the lines are doing stuff') is that both console cards have issues. Tomorrow, when I'm not outside, I'll try and look at some other BDAL lines and see if they are doing the same thing with no console card in. Noel

4 years, 11 months

looking for an old IBM knob from a 609 calculator panel

by bobalan＠sbcglobal.net

A long shot I know, but I'm looking for an IBM knob that's missing from a 609 calculator panel I have. Photos can be seen here: http://dvq.com/ibm/ibm-609-pnl1.JPG http://dvq.com/ibm/ibm-609-pnl4.JPG http://dvq.com/ibm/ibm-609-pnl5.JPG I have no idea if the knob was made by IBM or was a common knob of the times. Thanks, Bob -- Vintage computers and electronics www.dvq.com www.tekmuseum.com www.decmuseum.org

4 years, 11 months

by couryhouse＠aol.com

trying to ID early core stacks from GE 200 series ( like for dartmouth basic machine) or or ERMA. any old times have close up docs or part numbers? I may have found the lost treasure... we? have a? ?2 each 21 inch? or? ?so? wide? thing? ?with 2? monster ass? stacks? mounted in each one.. one is? intact? and? dirty? but? ? ?intact! ?the other? ?stacks? and? weird other things mounted to metal? frame? work are there? but? ? ?some? stiff is? just? hanging? off it unit? ?2? might? be? subdivided? and shared .? ? I? have never seen? GE? core? that? was? this? large...... Metal? ?frame? has? log? ?GE? part? number? ? each? stack? has? ?one? ?too the? game is? afoot! if? not? solved? rather? ?quickly? they? return to the? warehouse. thanks? ed sharpe? archivist? for smecc

4 years, 11 months

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test-drb May 2019