test-drb April 2011

test-drb@ccmp.vtda.org

184 participants
276 discussions

New rsync mirroring at trailing-edge.com

by shoppa＠trailing-edge.com

Last weekend I promised to enable rsync access to the archives (and mirrors) here. I've set up the following rsync (no password required) archive sets here: ftp : Public rsync access to ftp://ftp.trailing-edge.com/ area pdp-10-tape-images : public rsync access to the PDP-10 tape images, i.e. http://pdp-10.trailing-edge.com/ bitsavers-mirror : public rsync access to my local bitsavers mirror, i.e. http://bitsavers.trailing-edge.com/ Suggested rsync commands would be, for example: mkdir ./pdp-10-tape-images rsync -rlptu -v www.trailing-edge.com::pdp-10-tape-images ./pdp-10-tape-images mkdir ./ftp.trailing-edge.com rsync -rlptu -v www.trailing-edge.com::ftp ./ftp.trailing-edge.com mkdir ./bitsavers-mirror rsync -rlptu -v www.trailing-edge.com::bitsavers-mirror ./bitsavers-mirror Realistically the pdp-10-tape-images and ftp sites don't change often, butm my bitsavers mirror is kept up to date. I like to think my outgoing bandwidth (20 Mbit) is pretty much infinite, this looks like a good way to find out :-) ftp racks up to 3.5 Gbytes. PDP-10 tapes racks up to 2.2 Gbytes. And bitsavers-mirror racks up to 126 Gbytes. Tim.

12 years, 9 months

8/L has been sold. Have ADM-3A for sale.

by charlesmorris＠direcway.com

The 8/L, ASR33, DF32 disk emulator project has been sold. Thanks for all your interest (and offers). Anyone who wants the DF32 emulator schematic and artwork, I can email you a copy. I hope someone can take my "first draft" and make a useful unit for those who are interested. I have a working ADM-3A that I may want to sell also. It has a homebrewed lower-case 2716 ROM (thanks Steve Loboyko for the font files). I installed the "optional" parts for current loop on the main PCB, and used it with the 8/L. The only thing that's missing is the little aluminum panel covering the dip switches. Any interest? Same deal as before, please email offers, "sealed bids". thanks Charles

12 years, 10 months

Altair 680 power supply...

by wh.sudbrink＠verizon.net

My Altair 680 has achieved the position of primary attention on my workbench. All of the ICs are socketed. Not having seen power in over 20 years, I did not trust the power supply as far as I could throw a bus. I pulled all of the ICs, attached dummy loads (automobile bulbs) and powered up. Sure enough, there was AC all over the place (where there should have been DC). I replaced all of the electrolytic caps and that got rid of the AC but some of the voltage levels are very wrong, at least as compared to what is written on the schematics. The worst offender is just off the "plus" side of the full wave bridge (BR-1). It should be nine volts but is actually at 11.5. This makes what should be the main five volt rail a little more than 9 volts... the far side of VR-1 (a 7805). The wave form coming off the transformer is really ugly not a smooth sine wave. I hate power supplies. I don't really understand, looking at the schematics, what this transformer should be doing. My guess is that it should be making a nice nine volt, 60 cycle AC sine wave with each of the two outputs 90 degrees out of sync? What could be wrong with a transformer that it would produce something like: __ / \ | \ / \_ / \ | / | / \_/ bent and very squared off at spots? My scope shows nice clean 120 coming into the transformer. How do I figure out a part number for a replacement transformer? Thanks!

12 years, 10 months

Perkin Elmer 7300 Pro System Museum Quality!

by mail.list＠analog-and-digital-solutions.com

Here's one some of you might like. Perkin Elmer 7300 Pro System Museum Quality! http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2738081449 Current bid US $9.99

13 years, 1 month

Stan Viet passed away

by evan＠snarc.net

http://www.legacy.com/obituaries/floridatoday/obituary.aspx?n=stanley-veit&… Very sad.

13 years, 1 month

Bad ebay experiance with ebay seller : sammyslave1

by hp-fix＠xs4all.nl

I have had a very bad experience with sammyslave1, I bought two items an extended mass storage rom for the HP9845 and a HP-IB interface for my HP 9830A. I always pay instantly with paypal, when I contacted the seller about my items after a week or three I didn't get an answer, I waited another week and another email no answer. After I opened a dispute he answered and promised to ship the items and some extra's for the inconvenience. And yes his wife made a shipping label for USPS, but they never took the package to the post office, eventually I upgraded to a claim and got my money back, but what a waste of time this guy is. It took me 8 weeks to get nothing, so my advice don't buy from sammyslave1 (aka Larry L.) -Rik

13 years, 1 month

new here

by tdk.knight＠gmail.com

hi i'm 23 have a love for the history of computers and recently got a pdp8a with a nice collection of stuff http://img687.imageshack.us/img687/8493/pdpe.jpg curently scanning these http://img861.imageshack.us/img861/216/tapes3.jpg http://img41.imageshack.us/img41/4800/tapes2i.jpg http://img545.imageshack.us/img545/2889/tapes1.jpg the cpu test scaned if anyones interested https://docs.google.com/leaf?id=0Bwfh3w-st3iPOTljY2YxODQtNmE0MS00MzJiLTkwZW… dkca-aa option test #1 https://docs.google.com/leaf?id=0Bwfh3w-st3iPMGM5ZmVlNjktOTkwOC00ZGE4LTgyYz… yet to figure out how to make them into a pdf also got these software specific to the spectromitor the pdp8a came from http://img859.imageshack.us/img859/8412/tapes4.jpg has the fallowing cards M8315 ? KK8A PDP-8/A CPU board (hex wide) M8317 ? KM8AA PDP-8/A bootstrap, powerfail (hex wide) M8316 ? DKC8AA PDP-8/A I/O serial/parallel/clock (hex wide) G649 ? MM8AA 8K Core stack. H219A ? MM8AA 8K Core memory control. and then these http://img811.imageshack.us/img811/5155/card3u.jpg http://img21.imageshack.us/img21/4624/card2q.jpg http://img808.imageshack.us/img808/9238/adc120z.jpg and 2 teletype asr33's with hook up for the pdp8a i also have a heath h89 thats curently waitin for parts from a member at sebhc a h11 (ls1-11) with a nice collection of cubus cards h10 reader Geworkwaster 1 in need of parts and bunch of other GE faunic related stuff such as software some plc's controller cards for hooking into computers ect... a sick ibm p70 think it needs a floppy as i can't get it to read disks ibm model 50 bunch of industrial software a sick osborn 1

13 years, 1 month

Tektronix photos updated

by legalize＠xmission.com

With the addition of two more Tektronix 4015-1 terminals, I've rearranged my Tektronix storage tube terminals in the warehouse and uploaded some updated pictures of "Tektronix storage tube row". (The 4015-1 is essentially a 4014 with APL and printer interface options.) Neither of the 4015's are reported to be in working condition from the seller, but at least all the keycaps with APL glyphs are present. The 4010 and 4014 are relatively simple terminals, so I should be able to restore them to working order. They have no microprocessor, firmware code or custom ASICs, so repairing them should be a matter of replacing capacitors or replacing TTL or analog parts. <https://picasaweb.google.com/legalize.slc/Tektronix#> -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

13 years, 1 month

Latest DiscFerret beta software

by classiccmp＠philpem.me.uk

Hi guys, Here's a screenshot of the analysis side of the current DiscFerret software build: http://i162.photobucket.com/albums/t242/philpem/Screenshot-1.png At the moment, I've got it reading IMG files (the format of some disc images Chuck Guzis sent me a while back). CWI files are next on the hit list (another one of Chuck's file formats) and then DFI files (the DiscFerret native raw image format). The GUI was built with wxWidgets, and in theory the code is completely cross-platform compatible. I'm aware of wxWidgets backends for GTK, Mac Cocoa/Carbon and Windows, so that covers all the major *nixes, OS X and Windows. As long as you have a half-way decent C++ compiler, that is (*cough* GCC). However: I will openly admit that the code has only been tested on Linux. It slows down to an absolute crawl (~60 seconds refresh time) if you turn anti-aliasing on... though I suppose that's to be expected when you ask it to plot 30-odd thousand data points on a scatter chart... The raw-reader app is working too -- I can specify the various parameters of a disc drive, and do a full track-by-track read of an entire disc, and dump the data into a file. Next on the 'add list' is DFI support (so the analyser can read it, of course!) then disc-format script support. Effectively, I want a tool which can be told what type of drive is in use, what disc format, and will automatically figure out whether double-stepping is needed, and what read parameters to use. Even to the point where it'll warn you if you specify a 100tpi format and a 96 or 48tpi drive... Built in sanity checking :) Which now brings us onto naming -- the reader app currently calls itself "discferret-read", and the analyser "Merlin". Can anyone think of better names for these, or should I be lazy leave them as-is? (Suggestions on an email to the usual address please!) At this point the reader app is close to releasable (involving maybe a few more weeks of work assuming I find a ready supply of Round Tuits), but the analyser needs a lot more work. Mainly because I seem to be spending a lot of time chasing mismatched-free bugs in the algorithms. Thank $DEITY for Valgrind (and a great big sarcastic "gee, *thanks guys*" to the GTK developers who have obviously never heard of it, much less used it on their own code...) Cheers, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

13 years, 1 month

new here

by michael.99.thompson＠gmail.com

> On 4/24/11 10:04 AM, Tony Duell wrote: >> >> There are quite a few PDP8 owners/enthiasts here. I've got an 8/e with >> 32K words of core, ?RX01, TU56 and PC04 on my desk. I've also got an 8/a >> upstairs somewhere, but it's got the 8/e CPU board set in it, not the >> hex-height 8/a CPU board. I am told that was a stnadard variant. We (RICM) have an 8/I with 5x TU55 drives, a pair of bare 8/L, and a very functional 8/S that now runs FOCAL. I can give plenty of advice on ferroresonant power supply capacitors. Advice is easy to supply. -- Michael Thompson

13 years, 1 month

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test-drb April 2011