Hey folks,
Now that I'm done moving house I have time to wrench on the 6150.
Before moving it worked; you'd power it on, the LCD status countdown
would get to an OK value, but the CRT wasn't legible. I figured I'd be
wrenching on the CRT.
Instead, now when I power it on, it powers on for a second or two and
then shuts off. I'm assuming this indicates a short or power-draw
somewhere. I've reseated the CPU and RAM cards, the peripherals, and
unplugged the hard drives (2x ESDI) and floppy in case they had a
fault that was drawing too many amps and causing the power supply to
shut-down. I noticed nothing on the CPU or RAM boards (exploded caps,
etc.)
What should I look at next?
--
-Jon
+44 7792 149029
Hi!
As I'm preparing to setup my old hardware, I fetched two VAXstations
(4000/90 and /96) from storage and cleaned one of them throughoutly.
Then I gave power (to both of them), but both won't really start:
all 8 diag LEDs are on (--> power available but CPU didn't start
executing instructions.)
I took the PSU (from the cleaned /90), a DEC H7819-AA, and measured
it. Unfortunately I didn't find pinouts or schematics at a first
search. The plate states that there should be 3.3V, 5V, 12V, -12V and
-9V. I found most of that:
+------------------------------------------------------------------+
| o |
| DEC H7819-AA PSU 10 +---+ 1 |
| (view at the bottom side) | | |
| | | |
| | | |
| 18 +---+ 9 |
| o |
| +-------+ +-------+ |
| | Fan | | Fan | |
+----------------+-------+----+-------+----------------------------+
With above pin numbering, this is what I could find / measure / deduce:
3V3 brown 10 1 blue 12V
3V3 brown 11 2 black GND
GND black 12 3 red 5V
GND black 13 4 red 5V
GND black 14 5 black GND
5V red 15 6 black GND
5V red 16 7 white -12V
5V red 17 8 blue (0.78V)
(4.91V) lilac 18 9 brown (-1.65V)
Most values look plausible, except those three in parentheses. At
least one of them should probably be -9V wrt. GND I guess, but that's
totally absent. And what's the other two? (If I got the colors wrong:
Please forgive, I'm red-green blind.) That could be some "power-okay"
indicator, or external switch-off?
Maybe anybody has faced these issues and can point me to some docs
or "well known to be failing" capacitors? I'd be quite grateful for
any hints! :) ...and hope that maybe the above drawing/measurements
will be helpful for anybody else later on.
Thanks,
Jan-Benedict
--
OK. I have just read in a bunch of Rainbow disks. Most of them read fine on
the first, second or third try. Some have a sector or three amiss (I've not
yet checked to see if those sectors are mapped to the filesystem or not).
Some appear to be 'unformatted' though sometimes they read with errors.
These disks have what appears to be some kind of grime/mold/??? on their
surface.
Is there a good way to read these diskettes? To clean the grime off and
allow the floppy to spin (they all are super loud)...
At the rate things are going, there will be 5-10 of these...
Warner
Hello,
I have a number of DC1000 tape cartridges, with and without relevant data on them.
I have 2 questions:
1. Has anybody the IRWIN TFORMAT software?
2. I want to make images from the cartridges.
Has anybody done this?
We tried with Linux Mint, but the drive is unknown.
Thanks in advance
Lothar
Does anyone have one of Dwight Elvey's KIM-1 diagnostics boards out there who
would be willing to let me borrow it (I'm in southern California)? I would be
happy to pay shipping and a rental cost, provide a deposit, etc. Please contact
me off list if you're willing and the arrangements you'd prefer.
Yes, I'm aware schematics exist, but I was hoping not to place my ability to
fix this unit entirely upon my ability to assemble a board if a working one is
already out there.
--
------------------------------------ personal: http://www.cameronkaiser.com/ --
Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser(a)floodgap.com
-- I went to San Francisco. I found someone's heart. Now what? ----------------
Just letting everyone know that Bob Applegate passed away a few days ago.
He had been battling cancer for some time. He was involved with vintage
computing for some time. Here is his website: http://www.corshamtech.com/
This is the website for his memorial:
https://everloved.com/life-of/robert-applegate/
Take care,
Jeff Brace
VCF National Board Member Chairman & Vice President
Vintage Computer Festival East Showrunner
VCF Mid-Atlantic Event Manager
Vintage Computer Federation is a 501c3 charity
https://vcfed.org/ <http://www.vcfed.org/>
jeffrey(a)vcfed.org
Along the same lines as the 640K quote, I vaguely remember reading a book
that quoted Bill Gates when asked about developing any software for NeXTSTEP
(Probably porting Microsoft Office to compete against Lotus Improv and Word
Perfect) where his reply was "Develop for it? I'll piss on it!"
It's been 20 years since I saw that book and I have never been able to
confirm that was something he was quoted as saying, but it would then
explain why Microsoft entirely ignored NeXTSTEP (or they were just too busy
working on Windows and other unix ports).
-John
Hello Chris,
I saw this old post while searching for stuff related to the CPT Phoenix word processors. I was an engineer at CPT Corp. from 1978 thru 1989 and helped design the CPT 8100, 8500, 9000, and Phoenix systems.
The original monitor that I have has burned-out and I am searching for a replacement. You seem to have found/acquired the exact monitor that I have been looking for!
Would you care to sell the monitor, and keyboard too, to me? I would be most appreciative. It would certainly find welcome home, back with one of its original designers.
Best regards,
Rich Jones
Metasoft, Inc.
> 640K was maybe "enough for anyone"
>
> Weird but I even seem to remember someone saying "who woukd been more than
> 64k"
> Ed# SMECC
>
>
>
And let's not forget "what's the hardest part about emulating Gerald Ford
on a PDP-8? Figuring out what to do with the other 3K."
