Howdy to the list (and especially to Tony)...
I have a Macintosh 512K I would like to use to demonstrate certain UI
principles (okay, and also to play Dark Castle). The display hasn't worked
properly since I got it though.
In an attempt to stabilize the image, I pulled off the insulating
fibreboard covering the sweep board, and looked for bad solder joints to
fix. The problem is I don't know what a bad solder joint looks like aside
>from 'dull', and none of the joints look particularly 'dull' to me.
I reflowed a few joints randomly, with no clear sense of what I was doing
or where particularly to focus my attentions. Predictably it did not
change the behaviour of the image on the display noticeably.
I just in the last few minutes switched the machine on to photograph the
display for your expert appraisals, and found that its behaviour has
changed since it has sat. Now when I switch it on the internal speaker
makes a repeated popping. I'm guessing the power supply is resetting
itself continuously for whatever unknown reason.
I could use some guidance repairing this fault. What's my first step?
Tony, I'm a module swapper because that's what I know, and usually the
problems I have are in software anyway. I'm handy with a soldering iron,
though, and I'm showing a willingness to learn something new. Help!
ok
r.
We had one of these in our installation connected
to one Displaywrite system, if I remember well,
and another in the S/390 room.
I asked about it sometime ago. It appears to have
one 37 pin standard interface, but it's not clear what
is (or do) the other connector.
Regards
Sergio
----- Mensaje Original -----
Remitente: Chad Fernandez <fernande(a)internet1.net>
Fecha: Jueves, Octubre 25, 2001 7:28 am
Asunto: Re: IBM 8 Inch Drive
> It looks like a toaster, without the bread slots!! :-)
>
> What type of controller board does this use? Anybody know?
>
> Chad Fernandez
> Michigan, USA
>
> Owen Robertson wrote:
> >
> > A dual IBM 8" diskette drive is for sale on eBay:
> >
> > http://cgi.ebay.co
> >
> > It looks like the Display Writer drives to me. Will it work with
> a System/36
> > 5362? The connector on the drive looks like it matches the
> connector on my
> > 5362.
>
Congrats, Daniel.
I am a HAM amateur since 1974, my call is PE1CKF.
Just like you I never passed the morse code tests.
It is difficult to find the time *each* evening
for, let's say 20-30 minutes, listening to morse.
But with the latest developments like morse code
exam at 5 words per minute or even less (!) perhaps
I will one day be able to talk to you on 40 or 20
meters without the morse code study.
During the study at the Technical Highschool, in the 3rd
year, you work for some companies as part of the education.
One semester I had to stay as a guest with some people.
In the evening I was alone in my room so I took my rig,
an ICOM-211 144-146 MHz all mode, with an HB9CV antenna
with me the next week. Could enjoy the local HAMs, but
after some 10 minutes participation, the woman came up
the stairs. I had to stop immediately whatever I was
doing because her electrical organ made very strange
sounds as if an old drunk sailor had hidden inside the
organ and was mumbling something ....
I am pretty sure that many people on this list are HAM.
- Henk.
> -----Original Message-----
> From: Daniel A. Seagraves [mailto:DSEAGRAV@toad.xkl.com]
> Sent: vrijdag 26 oktober 2001 5:20
> To: classiccmp(a)classiccmp.org
> Subject: [OT] New toy...
>
>
> I got a new toy today... The FCC granted me the callsign KC9ALV.
> Now not only can I annoy my mom by leaving large computer parts around
> the house, I can annoy her by coming over the phone lines and
> TV and such. ^_^
> (I'm just kidding... All I have that I can use is an HT, I
> didn't pass the Morse
> so the HF rig is a paperweight until December, which is the
> next time the test
> runs around here. But once I get HF access, I may have to
> worry! ^_^ And I do
> know enough about RFI to know how to stop it, I'm just making
> a joke about it.)
>
> -------
>
>
Tony and Sellam, thanks to both of you for the suggestions. I'm going to
give Sellam's idea a try first since it's easier to poke a few keys than to
open the box ;>) I'll let you know what I find out.
The H89 was just one of several computers I've been given recently. Among
them were several TS1000s, a ZX80, a TS1500, an Apple ][e with monitor,
dual drives, and printer, and more.
The CP/M boxes alone include the H89, two Z100s (one with hard drive!), and
a Xerox 820 with hard drive and dual 8" drives. As I bring these boxes
into action I'm sure I'll have plenty of questions for the CP/M folks out
there, and some for the Z80 and S-100 hardware people too ;>)
For starters: The Z100 with the hard drive looks good, but I can't format
the ZDOS partition. PREP initializes the drive, tests the media (this
takes 1.5 hours on a 20 MB drive), and creates the partitions. I can then
monkey around with the size of the partitions and their names, etc.
However, FORMAT E: /S produces "Invalid media type reading drive E: Abort,
retry or fail?" I've swapped three different hard drives into the system,
and replaced the hd controller (I don't think I have a spare data separator
board).
I can successfully initialize and copy files to the CP/M-85 partition
(can't make it bootable yet as I don't have complete CP/M-85 system disks
for it).
And, what are the four adjacent jumpers on the hd controller (not the
Format Enable)? Is there any documentation available for this board? I
have docs for all the Z100 hardware except the hd controller . . .
Any ideas are welcome!
Glen
0/0
> YEsterday, somebody here (sorry, I can't remember who -- Alan Pearson?)
yup, that was me :-)
> admit that I don't have a clue about whatever bit of Java he claims people
> should understand.
Hang on, I'm only moaning about CS graddies who have been taught Java
for a year at college :-) java.lang.Object is the base class of everything
in Java, if they don't know that after being taught it for a whole year then
they know nothing much about Java, IMHO. Probably don't know a great deal
about inheritance either. It only annoys me when I end up interviewing them
and their CV says "studied Java programming for 1 year, in-depth
understanding of language & APIs", when they plainly know jack (in a box).
Doesn't mean anyone else should know it, only people who claim to "know
Java".
> Nor could I make any obvious comments about #include<foo.cpp> .
> It doesn't look particularly bad to me.
As you say, you're not a programmer. I wouldn't expect you to make any
comments. But people who have been taught C++ would recognise that this
is not the "done thing". To quote Gordon The Big Engine (sorry, too many
kids videos!), "it isn't wrong, but we just don't do it" :-)
> Does the above make me clueless.
Not at all, if I had 1/10th your hardware knowledge I'd be a very happy
chappy :)
-al
I got an Altos 586 from a friend a while ago, with an external 2400 baud
modem and a Wyse (50?) terminal. There were no Unix install disks
included. I am looking to reinstall the OS, does anyone know where I
could get a copy of the Xenix that it uses?
--
Joseph Kaye
1989 Lincoln Mark VII LSC 1995 Ford Aerostar XLT
-80HP NOS System -Contemplating Nitrous Install...
-B&M AOD Shift Kit -4.0 V6 / Electronic 4wd
-Addco Swaybars and Koni Struts -ALL YOUR BASE ARE BELONG TO US
>Fine. How about the original Macintosh that went for close to $1,000
>because it was "signed on the inside of the case by all the original
>design team members"?
You know, if someone is going to be an excited collector, they should be
an EDUCATED collector. ALL macs up thru the Plus and part way thru the SE
were signed on the inside by the original design team.
Now a 128k that was NOT signed (but that the back case was original)...
THAT would be an oddity and possibly of value (but since TTBOMK, there is
no such beast, I would have to seriously doubt the authenticity).
Things like that make me laugh. (I WISH I could sell one of my 128s for
$1000, I would make a point of fixing the two that don't work!... but of
course, if it is the signatures they want, I can sell them a platinum Mac
Plus that reboots spontaneously)
-chris
<http://www.mythtech.net>
I have had several Altos 586s Some ran MPM and some ran a very early version
of Xenix.
Does your machine boot? Have a hard drive? It has been a long time but I
really liked the Altos machines.
Paxton
Astoria, OR
>I just in the last few minutes switched the machine on to photograph the
>display for your expert appraisals, and found that its behaviour has
>changed since it has sat. Now when I switch it on the internal speaker
>makes a repeated popping. I'm guessing the power supply is resetting
>itself continuously for whatever unknown reason.
In the pre SE analog boards (128, 512, 512ke, Plus... they all used
essentially the same board), there were a few common problems.
One was a cracked solder joint on the main power feed (?). I think its
location was "J1", if I remember correctly. The joint looked broken, in
that the pin sticking thru the back side would have a blob of solder
around it that would have a crack in it, and possibly be seperated from
the board. If I remember right, it was a red cable in a group of cables,
located kind of in the center of the board.
Another common problem was a bad high freq capacitor. It was a large
capacitor located near the top of the analog board. I think it might have
been the only large cap up there. Unfortuantly, it didn't tend to show
any damage to a visual inspection. I can get specs on the cap and
location when I am at work tomorrow.
The final common problem was a bad diode near the bottom of the board.
When it was bad, the machine would make a "flup flup flup" kind of noise
when you try to turn it on (Ah HAH... sounds like what you might have).
Again, it showed no signs of damage toa visual inspection, but would test
bad. And again, I can get specs on it when I get to work tomorrow.
An ever so handy book for fixing these problems is "The Dead Mac
Scrolls", but good luck finding a copy, I think it has been out of print
for some time (although, there may be an updated version, I just tend to
doubt it will cover the old units). I happen to have a copy, and would be
more than happy to skim thru it and work with you to find the problems
and repair them.
I will email again tomorrow with better details of where to check and
what to test.
-chris
<http://www.mythtech.net>
In a message dated 10/25/01 2:15:45 PM Pacific Daylight Time,
dhquebbeman(a)theestopinalgroup.com writes:
> There were Altos' that ran MP/M-II, and others than ran XENIX... ISTR
> that the 586 was the squarish-box that ran MP/M-II, while the other
> model that had a hi-techish, Datageneralish look to it ran XENIX.
> We had both...
>
>
The Z-80 Altos was the 580. This was the same squashed hexagon design used in
the 586, 786 etc. Since it was a multiterminal machine each terminal had it's
own Z-80 IIRC. These ran CPM and MPM.
The 586s were an 8086 16 bit designs. Most of the ones I saw ran Xenix.
however I had a couple that ran MPM-II based on a version of Digital Research
DOS-86, I can't remember what it was called.
Most 586s were of the squashed Hex design that I think Doug is calling DGish.
I do seem to remember the first 586s were shipped in a square box, a la the
8XXX series. Of course my memory could be off, it has been a long time and I
never saw one of those.
Paxton
Astoria, OR
