>
> 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
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/
... 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
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.
?
?
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
>
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.
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
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