test-drb

test-drb@ccmp.vtda.org

101090 discussions

by jnc＠mercury.lcs.mit.edu

> From: Charles Dickman > a book that was pure computer geek porn: "Core Memory" by Mark Richards > & John Alderman. ... I went looking on Amazon for it. The price is $172 > for a new hardcover and $78 for a used hardcover. > This is ridiculous. For anyone who wants a copy, I just ran across a copy on eBay: http://www.ebay.com/itm/161534172515 going for a more reasonable amount ($29, no bids at the moment). The sale ends today (8:15PM EST). Noel

11 years, 7 months

Weekly Classic Computer Trivia Question (20141226)

by dpi＠dustyoldcomputers.com

This one is seemingly easy. On the front panel of the original PDP-8 (straight 8), how many lights are there? There is a pretty good picture of one on Wikipedia if you feel like sneaking a peek. Doug Ingraham PDP-8 S/N 1175

11 years, 7 months

Multiple copies (Duplicates or more)...

by lbickley＠bickleywest.com

Am I the only one getting multiple copies (duplicates or more) of cctalk emails? Fortunately, my email client supports eliminating duplicates - but I'd like to know if this problem is specific to me - or are others experiencing this too??? Lyle -- Bickley Consulting West Inc. http://bickleywest.com "Black holes are where God is dividing by zero"

11 years, 7 months

ISO Applied Microsystems EL 1600 Emulator Documentation

by aek＠bitsavers.org

In the early 90's Applied Microsystems updated their 16 bit emulators with a 68020 processor and ethernet. The original had a 6809 as the emulation processor. There is almost nothing about these on the net, there was apparently a EL 3200 version which supported Intel. This may have been a short lived product since they switched to BLM and other serial products around then. Main interest is I discovered I have one, most of my AMC boxes are ES 1800 (serial 6809) and wanted to try to use it. It's possible they switched to some proprietary undocumented protocol on the other hand. Their product part numbering is cryptic, to say the least. I have two units that look indentical on the outside (later plastic cases with the carrying handle) and the emulation processors in them are 6809 in one (the Z8001 one) and 68xxx in the other (the 68000 one, pn. 750-01600-00). Looking on eBay, it appears the 32 bit units are pn 750-13200-xx http://www.ebay.com/itm/271314972572 for example

11 years, 7 months

Tektronix 4014 optional communications

by djg＠pdp8online.com

I'm trying to get my 4014 working and am having trouble with the optional data communcations board. I'm not positive if its a later version of 021-0074-00 (070-1379-00) or a different option. It is identifiable by the control plate on the back has thumb switches that display the baud rate instead of a rotary switch. Does anybody have one of these who can tell me what settings and jumpers work for them or have the manual for this interface? My board is labeled 670-4758-00 JB-5337-00 Opt Data Comm With various settings I can get it to do nothing, send some characters properly and some wrong only while local echoing, and receive but not send.

11 years, 7 months

HP equipment, call for documentation

by Arno_1983＠gmx.de

Hello everybody, Santa brought me two fine pieces of HP measurement equipment (o.k., I had to order and pay for them up front...) and I'm now looking for documentation on those. 1: HP 8016A Word Generator (http://www.decadecounter.com/vta/articleview.php?item=35). This basically is a 256 bit memory with control logic and drivers that can be configured to spit out its front panel programmed contents through 1, 2, 4 or 8 outputs (with a respective word length of 256, 128, 64 or 32 bits). Trigger can be applied externally or via pushbutton, bit clock (up to 50 MC) can be internally generated or externally connected. Output levels can be set to TTL or ECL with adjustable offset, RZ or NRZ operation selected. Each output is also available negated on a separate connector, four channels have separately adjustable delays. The real surprise with this one was that it came with the IEEE-488 (HP-IB) data load option installed. I have found datasheets and the User section of the manual (Chapter 1-3) here, but this contains neither the HPIB instruction set (which I'd like to have anyway) nor the schematic and service instructions (in case I should need them - couldn't try the device out yet because I'll have to replace a broken IEC receptacle first). 2: HP 11835A Serial Data Buffer (http://www.hpmuseum.net/display_item.php?hw=665). Contains two banks of 64k x 16 bit parallel-input, serial-output data RAM, 128k x 16 bit control RAM feeding the frame control state machine, and 64k x 8 bit frequency RAM driving a parallel control output. Originally intended to provide continuous serial data streams at up to 4 MHz and control a frequency agile synthesizer (HP 8662A) for testing mobile communication devices; mine was in use at a Nokia R&D facility in Oulu, Finland, according to a sticker. This unit is usually controlled and fed with data from a microcomputer (HP 9000 Series 300 or Vectra series) through a HP 82306 GPIO interface, which I don't have. Found no documentation except for a four-page data sheet with a simplified block diagram (https://www.valuetronics.com/Manuals/HP_11835A.PDF) yet and would need at least the specification for the GPIO connector and its protocol to get anything working, plus preferably said interface card plus documentation and/or driver software. Thanks in advance for any assistance offered. Yours sincerly, Arno Kletzander

11 years, 7 months

ASR33 carriange stopper issue

by billdeg＠buzz1.com

> .. it could well be that the grease or oil on the side of the piston has dried and has become sticky goo. just clean well with white spirit ans apply a thin layer of thin oil. adjusting the valve hole should only be caried out starting the carriage from the far end. > An alignment problem between the piston and the cylinder could also be the problem. are the ball bearings of the carriage free running? My $.02 Alignment is the first thing to check here. You can clean and check airflow of the piston into the cup, but be careful about what grease (?) you use. I'd just clean and make sure there is no debris in there only. If alignment fixes the problem you probably don't need to do anything else. Use a nut driver to loosen the nut screws and carefully move the printer and/or belt return a few millimeters at a time until you get the result you're looking for. Clean the return spring (with something underneath to catch any debris) if it's really gunked up with old oil. Don't use pliers to open the nut screws, the investment in a nut driver is very worth it. b

11 years, 7 months

Italians around?

by info＠drukknop.nl

Hello all, as I am in the process of restoring a Olivetti Programma 101, Jim pointed me to a bunch of documents on the logic in this machine, all in italian. The Programma 101 is build using Resistor-Transistor-Logic, and the schematic representation is not one i've seen before. So I've decided to translate the docs to english and google translate can be of some help here, but a lot of the technical meaning is lost. By looking at the schematics and the boards themselves I could solve some mysteries, but I could use some help in translating. Our machine seems to have intermitted problems and I think they are caused by bad contacts in the backplane, but to be shure, a good schematic and explanation of the workings is a tremendous help. Is there someone able to take a look at the originals and my rudimentary translation and suggest improvements? -- Met vriendelijke Groet, Simon Claessen drukknop.nl

11 years, 7 months

Wooden case for DBit power and signal adapters - and a drive too

by david＠attglobal.net

Finally feeling guilty enough about stringing a bunch of expensive electronic bits out on my bench whenever time came to use an 8" disk drive, I mounted my DBit-sourced parts and power supply into a case. And the power+smarts sled slides in and out and has little feet on the bottom so it can be re-used with other loose 8" drives too. Some pictures with the least-intrusive Google Drive URLs I could manage: The sled that holds the repurposed PC power supply, FDDC power converter, and FDADAP signal adapter: https://docs.google.com/file/d/0B0im7ldJkbevMHNRV0s2MzZWcEE/preview?pli=1 The FDADAP doesn't have great mounting capabilities, so I just made a little edge holder out of wood for it. This slides into a cabinet (made of wood scraps...) so that it sits above the floppy drive it's powering: https://docs.google.com/file/d/0B0im7ldJkbevT1M3QTdsWE9obk0/preview?pli=1 And of course what olden tech thing would be complete without a shiny red button? https://docs.google.com/file/d/0B0im7ldJkbevaUVQRkxBbnozVTQ/preview?pli=1 There's room/depth on the front for a bezel, but I'm not sure I'll bother: https://docs.google.com/file/d/0B0im7ldJkbevSGJRREFxWklTRGc/preview?pli=1 Yeah, the digits on the FDADAP are upside down the way everything ended up being oriented, but I don't suppose I'll be looking at the back from now on.

11 years, 7 months

ASR33 carriange stopper issue

by simski＠dds.nl

it could well be that the grease or oil on the side of the piston has dried and has become sticky goo. just clean well with white spirit ans apply a thin layer of thin oil. adjusting the valve hole should only be caried out starting the carriage from the far end. An alignment problem between the piston and the cylinder could also be the problem. are the ball bearings of the carriage free running? On 27-12-14 15:14, Robert Jarratt wrote: > I have not seen this on my 33. There is a little valve at the end of the cylinder to let air out, try adjusting that. I can't remember if you should oil or grease the cylinder too, I am not at home to check what I did. Careful not to make the resistance too low either, it needs to be not too high or too low. > > Regards > > Rob > > -----Original Message----- > From: "Martin Meiner" <martin at meiner.ch> > Sent: ?27/?12/?2014 14:07 > To: "cctech at classiccmp.org" <cctech at classiccmp.org> > Subject: ASR33 carriange stopper issue > > Hello guys. > I recently acquired for a mere 25 EUR a nice ASR33. Aside of needing a thorough cleaning and greasing, it seems to be pretty much working fine! > But I wouldn't write here if I wouldn't need your help: > The ASR33's carriage has a spring that gets tighter as you type. And upon CR, the spring will bring the carriage back to its original left position. There is a mechanism, similar as a piston and a cylinder, which acts as a "bumper" or stopper. My problem is that this stopper, while not showing any signs of usage, seems too tight. If the carriage is all the way to the right, the spring will be strong enough to overcome the "too tight stopper". But if only a few words were typed followed by CR, the force is not strong enough to bring the carriage to its left home-position. Of course I could take down some of the piston's diameter to overcome the problem. But this doesn't seem right. > Anyone out there also had a problem with this stopper being too tight to bring the carriage to its home position and how to overcome it? > Thanks for any advise on the issue. Martin > -- Met vriendelijke Groet, Simon Claessen drukknop.nl

11 years, 7 months

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