Hi all,
Who can help me with an EMI filter from an IBM 5110 ?
Mine has an internal non-repairable short circuit.
This EMI filter is a CORCOM type F2280 and is located in the mains
entry box underneath the screen tube.
Any one ?
Thanks Henk
>Suppose you wanted to write an application for a manufacturing process that
>will, in all probability, run for the next 30 years. No direct control of
>the process itself is entailed (i.e., you don't need the program to
>operation valves or run motors), but you do need this program to compute
>manufacturing parameters for each customer. I/O requirements are very
>modest, mostly simple keyboard and display.
>
>What would you write it in? Clearly, you'd want to be independent of a
>particular software vendor, so the likes of Visual BASIC isn't an option.
>You'd also want to write in a language that isn't nearing obsolesence, nor
>one that's still evolving. "Niche" languages would be out of the question,
>as longevity could be a problem.
>
>So what would it be? My vote is for FORTRAN.
Impossible to say without a better specification of the application, however
given the longevity requirement, unless it was a very bad fit, I would probably
use 'C' (not C++, C# etc - plain vanilla 'C') for several reasons:
- It's been around a long time, and has been ported to many different platforms,
making it a well known and popular language.
- It has a reasonably clearly defined standard.
- It has always been developed with an eye to portability.
- It is still being used in many systems, and is likely to continue to be used
for a considerable time into the future.
- It's flexible enough to use as a general purpose language, and has the ability
to get "down and dirty" if you need. (Ie: It will probably not be a bad
environment for the task at hand).
But what is probably the most important reason to me:
- I have a mature 'C' compiler (I first released it in 1988) which I can port to
any damn platform I need, so I don't have to count on having a vendor to support
C tools on this future unknown system.
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.parse.com/~ddunfield/museum/index.html
>
>Subject: Re: Releasing OS/2
> From: "John Allain" <allain at panix.com>
> Date: Fri, 14 Oct 2005 15:59:09 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
What I'd like to see is a comparison of OS/2 to say DRI Concurrent386
and Win3.1 or Nt3. I picked the latter two as I know them well. I have
both concurrent386 and OS/warp 3 but never used them. Maybe I'm missing
something and I'd like to have an idea of and how practical their use
would be in the present as part of my PC based supporting systems.
Allison
>
>Subject: Re: OT: Language for the ages
> From: "Zane H. Healy" <healyzh at aracnet.com>
> Date: Fri, 14 Oct 2005 12:37:39 -0700 (PDT)
> To: cctalk at classiccmp.org
>
>>
>> > Are there any schools teaching FORTRAN and more? Does it
>> >have an active community? If not, ...
>>
>> Amazingly*, Yes.
>> I go visit my old college bookstore every few years for fresh titles
>> in Computer Science (this year: I bought O/S internals by Stallings).
>> It's a top 25 undergraduate engineering ranked place with a big
>> budget for new equipment so I was quite surprised to see this year
>> the book "Classical Fortran" by Kupferschmid. In my head I'm thinking
>> Fortran is Only for classiccmps and classiccmps are Retired equipment.
>> Apparently this course is for maintenence programmers.
>>
>> John A.
>> * to me, for one.
>>
>
>Fortran seems to still be the favorite language for number crunching.
>
> Zane
That is the forte' of Fortran. However user interfaces in fortran are sparse
as the language is not well suited to textual data.
I feel there is no one language for all tasks. For example older 8080/z80
hardware was likely programmed in ASM for embedded apps due to size constraints
of availabe ROMs. However I've seen a lot of stuff with basic in ROM and the
programming in BASIC so the hardware could be somewhat self supporting.
It would seem that languages that persist are those best able to cope with
large changes in computing environments. Fortran and BASIC are old and well
known as are Pascal and C and likely a few others. The rest are dialects or
specializations that live in specific application environments. When those
environments become passe` or surperceeded the languages will either evolve
or become "old".
Allison
>
>Subject: Re: luddites!
> From: Brad Parker <brad at heeltoe.com>
> Date: Fri, 14 Oct 2005 13:15:00 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>
>"Jeff Davis" wrote:
>>
>>Well, your own example proved the existance of productivity gains - 3 people
>>with a machine could produce as much as 10 people without the machine, ergo
>>the 3 people are more productive. If you give 9 of those workers the
>>machines, and keep 1 around to do maintenance on the machines, the whole group
>>is nearly 3x as productive.
>
>yes, but what if the 7 people who loose their jobs leave town and the town
>goes belly up?
>
>if you measure at the planet level it all probably makes sense, but at a
>local level it's not so clear.
>
>20,000 unemployed textile works in NC who won't ever be retrained may
>have a better understanding of this effect... (but only in NC).
>
>-brad
I cannot argue with that. Nor did I say that it was pleasent. I will say
that technological change has been responsable for several migrations and
those that didn't now commute a distance that took as many as 3-4 days by
wagon at one time.
The wholesale movement of production from one local to another of far lower
employement is older than automation and has always come with a social and
economic price that automation alone did not always entail. It's very
different to have ones job change then the facility disappear completely.
Allison
>
>Subject: Re: PCs that support only one floppy drive in hardware
> From: "Chuck Guzis" <cclist at sydex.com>
> Date: Thu, 13 Oct 2005 21:08:13 -0700
> To: cctalk at classiccmp.org
>
>On 10/13/2005 at 9:36 PM Allison wrote:
>
>>OK I have one so I know what it is. FD55BVR, care to guess? Also a
>>FD55BFR?
>
>Let's see, the BV is a 360K unit with head-load solenoid. The BF has me
>stumped. The F would indicate a 720K drive, but if that were so, the B
>wouldn't be part of it. FWIW, the "R" is a delimiter and ends the
>capacity/special feature field. What follows next is a number, such as
>200, that signifies revision, bezel color, etc. A final "U" means the
>drive is UL approved.
>
>Cheers,
>Chuck
>
No, the 55FV has a door latch solinoid as the head load when the door latch
is closed. The 55BF is same drive with light beige front, the latch lever
is opposite side a different lever shape the led shape is round.
Otherwise they are interchangeable.
Allison
Speaking of Gates, he showed up as guest lecturer at an entry-level
CompSci course at UW-Madison this week:
http://www.news.wisc.edu/11679.html
for MTV's "mtvU" network's "Stand In" series:
http://www.mtvu.com/on_mtvu/stand_in/
The other episodes are available on broadband but this one
isn't up yet.
>From the looks of the picture, I'd say this was a smaller
discussion session. It's not the big lecture hall they'd
use for a popular freshman course like 302.
- John
Hi everybody!
Firstly, if anybody tried contacting me in the last month, please forgive me
for being absent. I'm still catching up on my e-mail backlog since I had a
math exam on 10th of October that was quite important to prepare for.
Next, we've received quite an interesting donation at the University Museum
yesterday: what looks like an electromechanical guidance system for a
missile. A few photos are on
http://www.iser.uni-erlangen.de/anzeigen.php?inventarnummer=I1062
(click on small one for bigger version, click "Weitere Infos" (further
information) for two pictures of the innards (front and back)).
I'm asking here because we'd like to acquire some background information on
this unit, what type of missile it came from and so on. According to its
former owner, it was purchased from a scrapper in the mid-70s.
A small metal nameplate above the connectors reads:
| U.S. | Guidance Computer | G&C |
| PART NO.10586600-39 |MOD NO.4 |
| SER NO. 614 |WT. 55.75 |
| MFD BY THE BENDIX CORP E-P DIV |
| CONTR.NO.DA-01-021-AMC-11344 Z |
| ARMY MISSILE COMMAND |
Below that is a sticker reading "SA PROGRAM" with four boxes, the first one
stamped "T2". The small dial between the connectors (two of which are
covered with adhesive tape) is an hours run meter with two hands, indicating
a run time of 157 hours. Next to that is a sticker with "Pueblo Army Depot"
and a large "R" in a box. There is also a material tag of the Bundeswehr
(German armed forces) stuck onto one lid.
On the inside, there are eight (!!) subassemblies of mechanical calculating
gear, as follows:
CR/SA DISPLACEMENT MODULE, 2x
CR/SA VELOCITY MODULE, 2x
PROGRAM GEN. MODULE
SR VELOCITY MODULE
SR INTEGRATOR MODULE
SR DIPLACEMENT MODULE.
The last three are linked via gear trains, the first five only have electric
I/O. There are lots of Autosyn Transmitters, precision potentiometers,
switches, small relays and motors on those!
As far as electronics go, we have:
SERVO AMPLIFIER MODULE 5x
INT MOD & PREAMP MODULE 2x
CUTOFF NULL DET. MODULE
ROLL ARMING MODULE
ELECTRICAL MODULE
VOLTAGE MONITORING MODULE.
There was no documentation whatsoever with it, so if it is declassified by
now (I hope so), any information (or pointer to) is welcome.
Yours sincerely,
--
Arno Kletzander
Stud. Hilfskraft Informatik Sammlung Erlangen
www.iser.uni-erlangen.de
Lust, ein paar Euro nebenbei zu verdienen? Ohne Kosten, ohne Risiko!
Satte Provisionen f?r GMX Partner: http://www.gmx.net/de/go/partner
a scholar and a gentleman. I even considered building
my own, though not sure if MM made the artwork
available. Was put off by the fact that the board has
7 layers according to the article. If anyone is
knowledgeable enough of pcb production - is it
possible to make a 7 layer board w/o special
equipment/materials? Why did it even need 7 layers?
How many layers were did the IBM PC mobo have? I know
for a fact that the RE robot puter (80188) mobo had 2
sides (top and bottom, no sandwich).
--- cctech-bounces at classiccmp.org
<chenmel at earthlink.net> wrote:
> On Fri, 7 Oct 2005 07:29:40 -0700 (PDT)
> Chris M <chrism3667 at yahoo.com> wrote:
>
> > dont have one, but want one. I hope youll make
disk
> > images available.
>
> I certainly will. A list member has extended a warm
welcome to the idea
> of me imaging my disks and putting them on his site.
More to follow
> when they're all imaged and online.
>
> > --- cctech-bounces at classiccmp.org
> > <chenmel at earthlink.net> wrote:
> > > Does anybody else on the list have an MPX-16
system?
> > I recently
> > > acquired one from a list member and am wondering
how
> > many of these
> > > systems still exist. I have a large
(relatively)
> > collection of
> > > diskettes with mine.
> > >
> > > The MPX-16, for those not familiar with it, was
> > published as a project
> > > in Steve Ciarcia's 'Circuit Cellar' column in
Byte
> > magazine. It was a
> > > three part 'construction' article and the
machine
> > was sold by MicroMint
> > > for a time. What I've heard is that about 500
> > machines in total were
> > > produced.
> > >
> > > It's an early 'IBM Compatible' in that they
designed
> > it to be similar to
> > > the PC, but only to a certain degree. It uses a
> > serial console rather
> > > than keyboard/display adapter, and it runs
CP/M-86
> > and supposedly MS-DOS
> > > though I don't have DOS diskettes for mine. It
has
> > ISA slots and a
> > > similar architecture to the IBM-PC, coming out
of
> > that early era before
> > > there were PC clones from the likes of Compaq.
> > >
> > > I'm curious of how many other MPX-16 systems
have
> > survived to today.
> > > There isn't a lot about it online. I can share
what
> > information I have,
> > > as I have manuals and docs with my system. I'm
> > interested in hearing
> > > from other people with this machine.
> > >
> > > Scott
> >
> >
> >
> >
> > __________________________________
> > Yahoo! Mail - PC Magazine Editors' Choice 2005
> > http://mail.yahoo.com
__________________________________
Yahoo! Music Unlimited
Access over 1 million songs. Try it free.
http://music.yahoo.com/unlimited/
