test-drb March 2016

test-drb@ccmp.vtda.org

189 participants
229 discussions

by jws＠jwsss.com

I see on the usual site, an 11/23 box with a couple of random boards, one of which is an M7608 board. This is a Microvax memory board. I wonder if one can build up a Microvax in that backplane, or if that is not recommended. It would obviously be an 18 bit backplane. The backplane is H9276A. The auction also has a M9047 Bus grant card in it, so is essentially just the box. But I'd never seen Microvax parts plugged into those backplanes, and it made me think. thanks Jim

8 years, 2 months

HP 21MX paper tapes

by mattislind＠gmail.com

I have been going to our HP 21MX paper tapes that come with a M-series system that we received many years ago: http://www.datormuseum.se/documentation-software/hp-paper-tapes I tried to check if they already were available online somewhere but didn't find them when doing quick checks on random tape part numbers in the spread sheet. Maybe they are and then I don't need to bother reading them. Otherwise I will try to read them if there are interest and when I get time. /Mattis

8 years, 2 months

Cables

by jws＠jwsss.com

Anyone have a source for IDC cables / supplies? I'm in need of some 40, 50 and various other cables and connectors. I need some specifically for dec systems so those would be even better. The most urgent need is cables for the PDP 8/A front panel cabling. They are all 40 pin. I've got a unit with the programmers panel, so need cables for it and for the basic power panel. thanks Jim

8 years, 2 months

OT: domain for sale

by evan＠snarc.net

Is anyone interested in buying technologyrewind.com? It would be a good name for a collector's site.

8 years, 2 months

Passing of Ray Tomlinson

by c.murray.mccullough＠gmail.com

We communicate today, as yesterday, via email. Ray Tomlinson,a 1960's ARPAnet pioneer has passed on. He 'invented' the @ symbol. My how old things are truly great. Murray :)

8 years, 2 months

Usenet News Servers

by robert.jarratt＠ntlworld.com

My ISP appears to have stopped updating the newsgroups it hosts. What news servers do people round here recommend? Thanks Rob

8 years, 2 months

I want a front panel for my lsi 11 w/switches and lights

by jnc＠mercury.lcs.mit.edu

> From: Ed Sharpe > I want a front panel for my lsi 11 w/switches and lights! That's going to be a little tricky. The LSI11 obvously doesn't have a hardware interface on/in the CPU which would allow a lot of the functions traditionally found in a front panel (e.g. examining registers, single step, etc). Some of them can be done (e.g. a halt/run switch, which LSI-11's already support), and others could be 'sorta' done - e.g. if the CPU is running, DMA could be used to read/write memory locations. Probably the best way to have an emulated front panel is to build a board that i) emulates the system serial console on the QBUS (i.e. responds to 177560-6), and ii) has a micro or something which uses ODT to emulate the full range of normal console commands, and drives a set of LEDs and switches. E.g. hitting the 'continue' switch when the processor was halted would issue a 'P' command to ODT; when the 'halt' switch is raised, it would read the PC printed when the CPU halted, and display that in LEDs, etc, etc. Sounds like an amusing project for someone. Any takers? :-) Noel

8 years, 2 months

Imaging RX02 disks for simh (was: Re: MU-BASIC V2 and RT-11 V03B distribution disks.)

by thebri＠gmail.com

How the heck do you copy an RX02 disk for use in simh? I've been trying to transfer RX02 images between simh and a real PDP11 (that has only two RX02's, console, and ethernet). So far, I've only attempted sending an RX02 image from the PDP to simh, but simh fails to read it: "?DIR-F-Invalid directory". Even after adding 13*512 bytes to the start for the missing track, I still get invalid directory. My process is to COPY/DEVICE/FILES DY1:/START:0/END:330 DY0:BLOCK1.DAT, then FTP that off the PDP, delete the file, and do the remaining two thirds of the disk. Once all are transferred, "cat *DAT > floppy.dsk". I can transfer RX50 images using the same recipe, though I haven't tried sending an RX50 image created on simh back to the PDP. For what it's worth, I'm having the same problem with Alan Baldwin's TCP/IP disk images from http://shop-pdp.net/rthtml/tcpip.htm. simh can't read the individual DSK images, but could read the *.PKG with the disks inside, and >from that, I could (RT-11) MOUNT each disk to a logical device. b On Thu, Jan 28, 2016 at 11:50 AM, Mattis Lind <mattislind at gmail.com> wrote: > I found some 8 inch floppies with distribution kits for MU-BASIC V2 and > RT-11 V03B. I imaged those and put them here > http://www.datormuseum.se/documentation-software/rx01-and-rx02-floppy-disks > if anyone is interested in playing with MU-BASIC. There are both RAW disk > images and to be used in SimH and like and also DMK/IMD files. > > The system that floppies came with is this little ( > http://www.datormuseum.se/computers/digital-equipment-corporation/pdp1103-l > ) > system once used at Scania in S?dert?lje. >

8 years, 2 months

I want a front panel for my lsi 11 w/switches and lights

by COURYHOUSE＠aol.com

I want a front panel for my lsi 11 w/switches and lights! Ed# _www.smecc.org_ (http://www.smecc.org)

8 years, 2 months

DEC TU81 - "Logic Off" permanently illuminated-

by u.tagge＠gmx.de

Hi All, maybe someone can help me to bring my TU81 back to life again. I have checked the following, before turning on: - All capacitors on the Mail Power Supply and the one below the vacuum pump are fine > OK - Voltages check > OK - Fuses > The Fuse for the diagnostics power connector was burned: changed Problem is, that the "Logic Off" is constantly illuminated, after turning on. I had a look into the Tx81 Pathfinder documentation, and checked the following. - Check if Blower is running > OK - Disconnecting all DC connectors > Same result Pathfinder tells me changing the power supply. I hear only an relay clicking when turning on the Power Supply, also, when nothing is connected, in this time the "Logic Off" light blinks one time. I think, that the power supply checks itself that the voltages are OK, and that this fails. Any hints or tips? Many Greetings Ulrich

8 years, 2 months

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test-drb March 2016