Hi,
I've got Sun Fire V100 that I'm pretty sure at some point in time
actually worked, since I loaded the board with the maximum amount
of memory supported (2G).
Now, however, when powering on, the LOM comes up but upon issuing the
poweron command the main CPU apparently doesn't, all I get is either
1. print_message: Wrong message ID
2. or continuous scrolling of what look like blocks of register dumps
I can reliably get effect 1, but the effect 2 is not easy to reproduce.
The memory itself seems ok - transplanted it into a known good V100
board and that booted up to readiness (no OS installed yet), included
full memory init. Just on general principle (i.e. try the obvious things
first) I also retried with known good PSU, same result.
There are no obvious signs of trouble (e.g. bulked up or leaky
electrolytic capacitors, scorch marks).
Any ideas what that message wants to tell me?
Full bootup transcript below, note the fan failure is due to this being
run as a naked board removed from the case, so the case fans are 'missing'.
-------------------------- cute here for new monitor --------------------
LOMlite starting up.
CPU type: H8/3437S, mode 3
Ram-test: 2048 bytes OK
Initialising i2c bus: OK
Searching for EEPROMs: 50(cfg)
I2c eeprom @50: OK
i2c bus speed code 01... OK
Probing for lm80s: none
Probing for lm75s: 48
Initialising lm75 @48: OK
System functions: PSUs fans breakers rails gpio temps host CLI ebus clock
Power restored
LOMlite console
lom>
LOM event: +0h0m0s LOM booted
lom>
LOM event: +0h0m0s host power on
�
LOM event: +0h0m7s Fan 1 FATAL FAULT: failed 0%
LOM event: +0h0m7s Fault LED 3Hz
print_message: Wrong message ID
lom>
lom>poweroff
lom>
LOM event: +0h0m50s host power off
lom>poweron
lom>
LOM event: +0h0m55s host power on
�
LOM event: +0h0m56s Fan 1 recovered
LOM event: +0h1m2s Fan 1 FATAL FAULT: failed 0%
print_message: Wrong message ID
lom>
lom>poweroff
-------------------------- cute here for new monitor --------------------
Kind regards,
Alex.
--
"Opportunity is missed by most people because it is dressed in overalls and
looks like work." -- Thomas A. Edison
Does anyone have, or know of a reasonably priced supplier of good clean
used, or new 8" floppy diskette boxes? The kind made of plastic like these?
https://www.ebay.com/itm/134258177087
I have one 8" box with Xerox software in which the plastic literally
crumbling.
The price this seller wants for the case itself is reasonable but I find the
price of shipping outrageous.
Total shipping price for three boxes is shown to be $21.35.
I may be crazy, but this seems nuts for something so light.
Thank You
Don Resor
Tom Persky at https://www.floppydisk.com/ sells all types of FDs, albeit
well above the AOL price :-)
Interesting article about this last man standing in the business:
https://eyeondesign.aiga.org/we-spoke-with-the-last-person-standing-in-the-f
loppy-disk-business/#:~:text=Tom%20Persky%20is%20the%20self,and%20recycling%
20of%20floppy%20disks.
BTW, there are still four companies making iron oxide tape, but just
currently for audio/video/instrument usage.
If the demand for FDs continues past Tom's inventory then I wouldn't be
surprised to see one of them make some FDs too.
Tom
-----Original Message-----
From: cctalk-request(a)classiccmp.org [mailto:cctalk-request@classiccmp.org]
Sent: Friday, October 14, 2022 10:00 AM
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Subject: cctalk Digest, Vol 97, Issue 35
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Best I can tell the diodes are Passivated Silicon, Bead diodes, of which there are three flavors.
https://pdf1.alldatasheet.com/datasheet-pdf/view/1073401/NJSEMI/A15A.html
On EEVBlog it was suggested that these were Sintered Glass Bead diodes.
I do believe they are still in okay working condition. My thought process is that they are probably quite noisy. Installing a modern type of diode would also I believe dramatically reduce generation of heat.
It is nice that a Power Supply board is laid out in a way that you can access all of the components. Nothing like some of the small 5v switching supplies in which most of the components are shoved close together.
I downloaded the 1977 GE Semiconductor manual, but it’s not easy to find it without a part number.
Back when I was in my early 20’s a neighbor whom was an Engineer at Xerox in the power supply division at 701 South Aviation Blvd. El Segundo, gave me a bundle of those soft bound Motorola reference manuals, some RCA TTL manuals, Zener Diode reference etc. The books sat on my shelf for many years until I ran out of room. I moved them to my shed which at the time was safe from the weather. After years of storage many of them were damaged from dampness etc.
In the last 10 years I realized I should have taken better care of them. I realize they are almost worth their weight in gold.
I was able to find a few of those books used and purchased them at (luckily) reasonable prices.
I regret that and a home brew vacuum tube combo preamplifier/amplifier stereo unit. I was forced to part with. My father referred to it as “junk taking up space”.
It contained 4 6V6GTs, 2 12AU7As, and a 5U4 Rectifier. The front end was early GE (germanium I suppose) transistors. They were of the metal oval shaped black painted metal can type with the pinched evacuation nipples.
Don Resor
From: Joshua Rice <Rice43(a)btinternet.com>
Sent: Thursday, October 13, 2022 9:44 AM
To: D. Resor <organlists1(a)sonic.net>
Subject: Re: [cctalk] Re: Xerox 820II U07 Power Supply magic smoke....
On Oct 13, 2022, at 2:32 PM, D. Resor <organlists1(a)sonic.net <mailto:organlists1@sonic.net> > wrote:
A couple reasons I'd like to have a circuit diagram is to know what the RIFA capacitors purpose are. The other is, a couple of the electrolytic capacitor are double covered with what appears to be rubbery heat shrink tubing, therefore I cannot read what their value are.
Generally, though not always, these are simply “coupling” capacitors, that are used to limit RF interference from appearing on the mains supply. Most, though not all, PSUs will work fine without them. Some others won’t function right as they’re used for generating clock signals from the mains supply. I believe that some PDP-11 supplies use them for this purpose.
One of these two electrolytic capacitor appears to have a dried substance around the top. The over-pressure venting cuts in the top of these two capacitors are not split. At this point I cannot tell if it is dried electrolyte, cement to hold the sleeve on, or possibly paper.
Sometimes it’s just glue , but better safe than sorry, Cut off the sleeving (it’s used for electrically isolating the cap from other components), get the rating off of it, and replace with like. Probably worth heatshrinking them again as well.
Seems someone was in hurry on the day this PS was tested. I cannot make out date, is it 1983?
<https://www.dropbox.com/s/zlt2ocpqulil13j/pssticker.jpg?dl=0> https://www.dropbox.com/s/zlt2ocpqulil13j/pssticker.jpg?dl=0
Looks like ‘85
What type are the diodes, their rating etc.? I seem to remember this type with a black band were rated at 3 amps, but that's all I remember.
The TO-3 transistor/regulator has no P/N silkscreened on it.
Having a circuit diagram helps to cover many bases. Apparently it's an Astec AA12070.
It’s unlikely that these would have failed. If they have, i would (as another person suggested,) just replace the unit with a modern Meanwell supply. At that point, it’s probably not worth the time and effort to replace all the parts.
Placed the PS board back in the garage to continue airing out! 😉
Don’t fear the RIFA, but keep the windows open, just in case.
Josh.
Where might I find a schematic diagram for the Xerox U07 8" FDD,HDD
expansion cabinet for the 820II, and/or the 105P80450 power supply?
The Xerox Professional Computer Technical Reference Manual I downloaded from
bitsavers.org doesn't seem to have those particular schematic diagrams.
For your enjoyment the part which smoked.
https://www.dropbox.com/s/al9kx3yw9ypwp89/Xerox105p80450.jpg?dl=0
I certainly am glad I have the lid off while testing. Unfortunately these
capacitors which appear to be film type were hidden from view.
The fuse didn't blow, but that .22uf 250v capacitor certainly stunk up the
house. It smelled like burnt popcorn, plastic and the bottom of a coffee
pot which has boiled dry, yech!
I know that if I had pulled the power supply board first I might have seen
the physical cracks in these boxed capacitors.
Wasn't it Marc V. that said in one of his videos, you don't need to shotgun
them all! Oi, lol
It's when things like this happen that I most always worry about not going
over vintage equipment fine tooth comb.
Don Resor
Hi all,
anybody has some GCC or any other tool chain for the above?
Or some pointers, which was the last version of the GCC tool chain which
supported the i860, and would be still compile-able on this days tools/OS's?
Anything?
Thanks in advance!
> Date: Wed, 12 Oct 2022 15:54:33 -0500
> From: Steve Lewis <lewissa78(a)gmail.com>
> Subject: [cctalk] datapoint 2200 programming
>
> Does anyone know how the 1970/1971 original Datapoint 2200 was programmed?
> It had tapes containing terminal programs to access different types of
> systems. And the instruction set was said to be similar what became the
> 8008. But how were these terminal programs created and how were the tapes
> written? Were they under emulators on larger systems, like a PDP-10?
> Were there any tapes that had something like a machine code editor and
> tape-write routines? I assume no kind of ROM was built into the system
> (unless it had a built in machine code editor, and routines to write that
> content to a tape?) Was a version of BASIC ever built for the 8008 that
> ran on a Datapoint 2200 or similar system?
>
> -Steve
While in college, 1973 to 77, I had a part-time job where one of the things we did was use a Datapoint 1100 dual cassette model to act as a data entry terminal for a database system running on a Cascade 80 minicomputer.
I did the Datapoint programming, which was to query the db over an async line for a form template, allow the operator to fill in the form, then upon entry, send the data back. The db would provide the next form to display. A rudimentary state machine at several levels.
The Datapoint came with a Cassette Tape operating system, called CTOS I believe. You booted it up, and the second drive was your working drive. The Programmer’s manual referenced shows you the commands. There was an simple tape file system, Editor, Assembler, Debugger, and a library of subroutines for common access to the system’s I/O.
I remember very little about the details of working on it, but I had no problems getting the data entry system working. You just sat down and started programming it. The instruction set was the model for the 8008, but it preceded the popularity and availability of that chip.
My boss did some real inspired work on the Cascade Data side. He managed to insert the database access code into high memory of the system, and hook into the native OS. So we could use the system normally, but the database serviced the terminal in the background. I did other Cascade programming in assembly, I wrote my own instruction card for the system.
In my senior year, the facility switched over to using IBM System 3 equipment, and I got to work with RPG, 8-inch diskettes, and 96-column cards.
Dave.
Sent from Mail for Windows
Hi all!
Been working on my 386i's, all the power supplies are smoked, so I
bought a totally burned out one, gutted it, and connected a PC/AT power
supply up to the card edge. Sure enough it works, and I now know that it
needs +5, +12, -5, -12 (for the ISA bus) and a 5 volt "supply ready"
signal as well.
Also found the serial console interface works, and realized I should
update the 386i FAQ with this information. So what would be the best way
to do that in this day and age?
CZ
Trying to tar a directory and transfer it to my AT&T 7300 (SVR2 unix).
Tar -tf works fine on the Mac OSX, but when I copy it over the Unix (not
gnu) tar gives me a:
Tar: blocksize = 20
directory checksum error
When I try to tar -tf the file. Which usually means the block size is off.
Any way I can check to see what the block size is on a modern system
(like a Mac)? tar -tvf doesn't seem to tell me.
Thanks!
C
