I was just thinking about troubleshooting, and am curious if anyone has used a
frequency counter for troubleshooting? It seems like it would be another way to
find out if there are clock or data signals besides using a scope. And
reasonable frequency counters shouldn't cost more than $50.00 or so including
shipping.
Thanks for breaking the good news colin. :D
I really hope it goes to a nice home it would be a shame to neglect that big of a system.
Hmmm, asides from our two Canadian tire sores (they have something, there are Twinax terminals everywhere!) I really can't think of any place in town that would have an IBM mainframe of any kind. I can see modern servers and lots of them but the closest place I can think of that would hide an IBM would be the lower mainland....or the Okanagan valley.
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Hi,
I am trying to gauge whether there is sufficient interest in the Vector
Graphic to support a mailing list. Please reply or email me if you'd be
interested in joining.
The mailing list would be a LISTSERV on a university domain (.EDU) *NOT* a
Yahoo! Group.
Thanks!
Andrew Lynch
>
Edward writes
> Manual says something about "dissonant piano chord" - how is it
> supposed
> to sound like? One thing I've verified that without graphics card
> the chord sounds the same.
It's an arpeggio of some sort, perhaps with a 7th. Haven't worked it
out.
Getting the boot-tune means that much of the computer is working
properly. Try pulling the graphics and reseating the memory and
processor module & memory and see what pops out on TTY0. It could be
bad graphics (had that happen once in an Indigo), in which case there
is a surfeit of XL/Express graphics boards around (I have an Extreme
that I haven't used for years).
Do you know what the hardware is? Another possibility is that someone
tried to upgrade the processor module beyond what the boot PROM could
support. Most of the time the machine will 'let it slide', but some
cause issues (especially if it's a R10k on a R4k board). If you don't
know for certain than describe: "module with a big aluminum heat sink
and a small portion of board exposed that has several SMD memory chips
on it" can localize it to one of 2 processor modules (R4400 in either
200MHz/2MB cache or R4400/250 with 2MB). Also give the IP number of the
main board (it's near the riser for the GIO/EISA cards), and the model
number on the back (CMNB007-something).
> Really don't understand all the talks about catweasels secrets, etc.
> Just make few boards for the classiccomp group, and be done with the
> subject ;-)
I suppose--every once in awhile, I run into a very odd format that's
not compatible with any of the commodity controllers and am forced to
use a Catweasel on it. But 99% of what I see is plain old soft-
sectored media, readable on most WD17xx or NEC 765 controllers.
Cheers,
Chuck
-----REPLY-----
There has been lots of talk about these universal floppy controller devices
and I for one would LOVE to see one done but so far nobody has made one
work. The closest thing I have seen is either the external floppy drive and
compaticard combination or the parallel port Backpack external floppy drive
>from Microsolutions. If anyone actually makes the universal floppy reader,
please put me down to buy one as well.
However, IMO, the best solution for the universal floppy drive is an old PC
with a Catweasel and a 3.5", 5.25", and/or 8" floppy drive. Then just write
the software for it. Really, writing software for the Catweasel is really
simple and it is 100% open source.
The documentation is all available publicly, its supported in Linux, MS-DOS,
and/or Windows, the owner/manufacturer is as accomodating as one could
possibly hope for (Jens Schoenfeld). There is a developer list and lots of
enthusiastic users. The hardware is cheap and readily available. Count me
as diehard Catweasel fan!
The Catweasel in an old PC is as close to the perfect universal floppy drive
reader as far as I can see. What else is needed? More and better software
and that is about all.
There are Catweasel software available for practically every format
imaginable. Most if not all of the soft sector formats are covered by the
Tim Mann CW2DMK software. There are reader for many formats such as
specialty disks as the Amiga, Atari, Macintosh, Commodore, Nintendo, Apple
II, etc. There is software for many of the hard sector formats as well
(NorthStar, PTDOS, Data General, and Heath, at least. Vector Graphic is in
work).
Thanks and best of luck with your project. Really, if anyone does complete
a universal floppy reader which is even close to as good as the Catweasel, I
will be in line to buy it.
Andrew Lynch
>From a UK point of view 'motor' as in motor-generator would be taken to
some form of internal combustion engine.
I have heard lots of references to 'motor-generators' but never an
'engine-generator'.
Devices used for AC to DC, DC to AC and voltage conversion using a
electric motor coupled to a generator would be referred to as 'rotary
convertors'.
Rod Smallwood
-----Original Message-----
From: cctech-bounces at classiccmp.org
[mailto:cctech-bounces at classiccmp.org] On Behalf Of Tony Duell
Sent: 18 October 2007 01:18
To: cctalk at classiccmp.org
Subject: Re: VAXen at home
> It may be European vs US usage, but in the US "motor" almost always
> means electric motor in this and other contexts. So what you
That tends to be UK usage too. The thing under the bonnet (OK, hood) of
a car is called an 'engine' over here. 'Motor' for that would be very
uncommon.
To me, a 'motor generator' is just that. An electric motor driving an
electric generator, to be used to convert voltage/frequency, etc. A
'rotary converter' (or 'Dynamotor; if oyu go back far enough) is a
simialr thing with common field windings/frame/etc rather than 2
separate electrical machines with the shafts coupled.
> call a "motor-generator" would be here just plain called a "generator"
A 'generator' over here is either just the mechanical-to-electircal
energy converter or , as you said, a heat engine coupled to such a
machine. Certainly if you hired a 'generator' (as somebody suggested we
should do for a VCF-type event), you'd expect to get something with the
engine included.
I don't know how common these other term are across the Pond, but an
'alternator' is an AC-output geneterator, a 'Dynamo' (short for
'Dynamo-electric machine' is a generator, normally DC output, with a
wound field, and a 'Magneto' (short for 'Magneto-electric machine' is a
genatore with a permanent magnet field. Which means the common bicycle
dynamo (as it's normally called over here' is in fact a magneto....
-tony
> I really want something bigger and something that just screams "I'm
> dimming your lights!". A crimson running off a serial terminal does
> not seem to cut it for me.
IBM is a different mindset at the mini/mainframe levels than UNIX-type
systems, and hobbyists suffer from the fact that IBM does not court the
hobbyist market. Notice that I did not say it was a worse mindset, just
different, nor did I imply that any company must bend over backwards
for the hobbyist.
IBM minis are optimized for database, accounting and semi-mainframe
type tasks, too, and there are many pitfalls and booby traps in place
to prevent horrible and unscrupulous people from buying them secondhand
without giving IBM their cut, at least on the AS/400 level. You might
want to look at one of the heftier VAXen or Alphas running VMS-
different from UNIX and bulletproof, but still from within the same
"interactive terminal" mindset. The OpenVMS Hobbyist program and the
availability of free/low cost documentation and help is a big plus
there, too.
A VAX 7000 or AlphaServer 4k series will dim the lights on a branch
circuit, definitely, and if that doesn't cut it you can plug in a
couple of LaserJet IIISIs. Note that dim lights = low voltage = bad
news for extended operation of SMPSUs, though :).
Be patient: RealityEngines happen.
>My 8809 came from a tire store. I is probably just spare parts now,
>because it is covered with brake grinding debris.
Oh that can't be healthy to the drive. hmm, I wonder if the will ever replace those systems soon?
They have been in use for almost two decades now however inventory work does not mean graphics so they might stick with
whatever they have until it finally gives the ghost.
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I'm sure I saw a development system at DEC for the 4004 running on a PDP-8 circa 1975.
Rod Smallwood
-----Original Message-----
From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of Roy J. Tellason
Sent: 13 October 2007 19:41
To: cctalk at classiccmp.org
Subject: Re: 4004 and IC history / was Re: Vintage computer photogallery
On Saturday 13 October 2007 05:13, Brent Hilpert wrote:
> Can't remember where I read it, but it seemed plausible for the time
> the
> 4004 was being developed (1970), also that it was compounded by
> management's perceptions that the 4004 was a little business on the
> side and not willing to invest much in it, memory chips still being the focus.
> On the other hand, I wonder what packages the original Busicom designs
> utilised - that Intel would otherwise have been obligated to produce -
> one would expect, or typically, they would be larger. (The 4040 would
> go to a larger package, of course.)
Having heard of the 4004 of course, I know basically nothing about it.
Except that it's the part that was supposed to have started all this... And
the 4040? I've only seen mention of it now and then.
(Snip)
> Perhaps not speed as an issue but you were wired into the small family
> of chips that understood the highly specific machine/bus cycle, at
> least until the 4008/9 came along that broke out the address/data busses.
4008/9? First I've heard of these at all.
Can you give any sort of a general overview of what those parts were all about?
I remember very little about the 8008, it having appeared in that Radio-Electronics article way back when.
I do remember, even after the 8080 article in Popular Electronics came out, not thinking very much of microprocessors for quite a while. They seemed limited, it appeared that you had to really go through a lot to fit your thinking and way of doing things to what they could handle, and it took me quite a while before I got to the point where I got a really good grip on the tradeoffs involved, like low package count, etc. :-)
--
Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James M Dakin
It seems that there are a number of websites and listservers for classic
computers. Have any of you who run such sites looked at forming a WebRing? It
would certainly be easier to have an up-to-date webring resource than having to
wade through Google search results. I, for one, would enjoy being able to go to
one site to find sites that contain information I'm looking for!