test-drb

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101090 discussions

by rdawson16＠hotmail.com

Did you guys catch this: http://aturingmachine.com/ Cool! Randy _________________________________________________________________ The New Busy is not the old busy. Search, chat and e-mail from your inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=PID27925::T:WLMTAGL:ON:…

16 years, 1 month

IBM Monochrome "Black and White" Parallel card double

by billdeg＠degnanco.com

> > If it's the original IBM5151 monitor, remember there's no horizontal > oscillator in the monitor. The Hsync (or more correctly HDrv, which is > what IBM called it) output from the MDA card goes to the base of the > horiztoal driver transistor, the collector is then transformer-coupled to > the base of the horizotnal output transistor. > > This means a 5151 will try to run at whatever freqeucny you give it, the > horizotnal output stage is likley to protest if it's way off, though. I > don;t think that if you give it an HDrv of the wrong frequency it will > ever give you a double image. > > -tony > It is a 5151. I was able to reproduce the problem on a newer monochrome monitor. bd

16 years, 1 month

HP 64000 relocatable file format / assembler

by classiccmp＠philpem.me.uk

All this talk about the HP 64000 has got me thinking... The HP 165xB Inverse Assembler Toolkit includes a DOS-based table assembler that appears to be derived from something used on the HP 64000, and it spits out what the manual calls a "HP 64000 format relocatable object file". This is what the analyser loads to run an IA. Did HP ever publish a spec for the .R (relocatable object) file, or has it ever been successfully reverse engineered? This is one of those "curiosity killed the cat" type projects; I've been wanting to use the HP LA inverse assemblers on a PC since I got my 1651B (mainly because a PC can theoretically handle a much larger symbol table). Writing an assembler / compiler for my own custom format and VM is always an option, I suppose, but I'd rather like to be able to run the HP IAs that I don't have the source code for (ISTR I've got a 68000 one somewhere). Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

16 years, 1 month

Whatever happened to the DG software archive...

by mjkerpan＠kerpan.com

... that was announced by Bruce Ray back in December. The original posting promised details in a few weeks but AFAIK such details never can forward. Did something happen to cancel the deal at the last second or are things just taking longer than originally thought. Mike

16 years, 1 month

pdp-11 ME11-L core memory system engineering drawings

by hp-fix＠xs4all.nl

I've aquired the pdp-11 ME11-L core memory system engineering drawings. Before I put it on ebay, if some one is interested, contact me off-list. -Rik

16 years, 1 month

PDP, TYPESET-8 and linotypes

by michaelkraus1969＠yahoo.com

Linotypes, when driven from paper tape, used the 64 bit, six level TTS or Teletypesetter code. There are two key line ending codes that were always in sequence. One was the?RETURN code and the other was the ELEVATE code. ? On the linotype, the ELEVATE key would end the line and "elevate" the matrixes, as a group, to the caster and eventually to the distributor. ? ?

16 years, 1 month

Dice (was Leaving computers on... (was Re: Disc analyser news update))

by roger.holmes＠microspot.co.uk

On 26 Mar 2010, at 06:00, cctalk-request at classiccmp.org wrote: > > Message: 8 > Date: Thu, 25 Mar 2010 18:58:19 +0000 (GMT) > From: ard at p850ug1.demon.co.uk (Tony Duell) > Subject: Re: OT: Leaving computers on... (was Re: Disc analyser news > update) > To: cctalk at classiccmp.org > Message-ID: <m1NusG5-000J3xC at p850ug1> > Content-Type: text/plain > >> There is a little test jig that is sometimes used, that holds diagonal >> corners of the die between centers, for a spin. If the die reverses >> direction of rotation right before it settles to a stop, then it fails. > > The 'Pviot test for loads'. There are several other ways to make dice > show numbers with the 'wrong' prboabiltiy, though. Six LCD displays, single chip microcomputer and an orientation sensor? :-) Keeps it on topic anyway. > > Totakky OT, byut 'Scarne on Dice' has a couple of chapters on this. (No, > I don't gamble, but I happen to have said book on my bookshelf) > > -tony >

16 years, 1 month

DECTalk DTC01

by pontus＠Update.UU.SE

Hi All. I've become curious about the different DECTalk devices. There seems to have been a number of variants. The stand alone DTC01, a UNIBUS version and a PCI card version (DTC07). Do all these sound the same? Or are newer ones more advanced? The number (07) on the PCI version indicate that there has been at least seven versions, what are the others? And finally, does anyone have system over and would consider selling it? (DTC01 seems to be the simplest and is thus preferred) Regards, Pontus.

16 years, 1 month

Desperately Looking for Honeywell DDP-516 documentation

by hachti＠hachti.de

Hi Folks, I recently came across a Honeywell DDP-516 computer. I'm currently resurrecting the system. That basically means assembling the pieces I got and fixing minor issues. The most work comes from missing mounting hardware :-( The system came with a paper tape reader interface. And a paper tape punch interface. I have schematics for the reader interface. --- But I'm desperately looking for the paper tape punch interface schematics! Does anyone have these? Al? Bill? CHM? Someone else? There's also another DDP-516 owner who would like to get hold of these schematics. I have no information about that interface. Only the programming interface is known. And it is not the same interface module as used in the H316. The H316 interface has PTP and PTR in one and uses completely different ?PACs. BTW: I could need some spare ?PACs to fix a memory (so far at least one CM006). Will write a separate post after having checked out the system, listing all I'm looking for. Best wishes, Philipp :-) -- http://www.hachti.de

16 years, 1 month

Scrapping and re-use (was Re: Talking of old IBM systems)

by ethan.dicks＠gmail.com

On Wed, Mar 24, 2010 at 11:30 AM, Chuck Guzis <cclist at sydex.com> wrote: > On 24 Mar 2010 at 9:16, blstuart at bellsouth.net wrote: > >> I don't know about the ocean, but they did send them off to >> scrap yards and stuff to be demolished... > > There's another aspect to the problem, that CDC ran into during the > 70's--that of used parts finding their way into the mainstream. > Apparently, this was enough of a problem that CDC ordered that any > decommissioned system be reduced to unusable junk... DEC had a problem in the 1980s with parts and machines that had been scrapped ending back in the sales stream. The big problems for them were maintaining the perception of quality (much of what got scrapped had failed some aspect of the testing process) and the tax issue of claiming that an item was scrapped but still out in the world. I was told one source of this was the recyclers picking through the bins of scrap coming from DEC and reselling things that were deemed resellable. They were paying by the pound for precious and ferrous metal scrap but making much more from the occasional gem. As the story goes, DEC bought a large shredder (large enough to accept 19" racks!), ensuring that re-use would not be feasible. We had a similar issue at Software Results - obsolete (prototypes and Rev 0 boards) and unrepairable boards were lying around after they'd been scrapped - we couldn't repair them since they'd been written off, so since they were large and green (because of the solder mask), one of our student employees nailed a bunch of them to a wooden frame in an irregular isosceles triangle pattern and made a "COMBOARD Christmas Tree" (using 9-track write rings as ornaments and tractor-feed tearoffs as garlands). Because the boards were rendered more unusable (as computer peripherals) by drilling nail holes in them, it was considered an acceptable re-use. I wish I had a picture of it still. -ethan

16 years, 1 month

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