>From: "Tom Jennings" <tomj(a)wps.com>
---snip---
>
>Though there's always selenium rectifiers, ugh. Besides being toxic,
>huge, hot, they are slow and terrible forward/reverse ratio, though
>likely faster than a relay. They've been around for a long time, I
>wonder how good they' be as a relay signal diode (shudder).
>
>
Hi
They should work. They even have a slight advantage
as diodes to absorb the flyback energy in DC relays.
The increased forward voltage drop means a quicker
release of the relay.
Also, I though I'd mention that most AC relays have
a small copper shunt coil to help delay the release
of the relay between cycles. This keeps the relay
>from chattering at 60Hz ( 50Hz for UK and Japan ).
I would guess the coil does the same thing for
a DC relay.
Dwight
>From: "Dwight K. Elvey" <dwight.elvey(a)amd.com>
>
>>From: "Steve Thatcher" <melamy(a)earthlink.net>
>>
>>you create your OR functionality with diodes - use two diodes (or as many
>inputs as you need) such as the 1N4001 for your inputs. Tie the cathodes
>together and attach that to the relay coil. Apply "logic high" (whatever
voltage
>your relays operate at) to either (or any) diode anode and the relay will turn
>on. The relay can be the next stage and does not have to be there to implement
>the OR.
>>
>>best regards, Steve Thatcher
>>
>
>Hi
> You don't need the steering diodes if the lines that provide the
>terms don't cross talk to other coils. This is pure relay logic
>and works with AC relays as well as DC. The diodes are only
>needed when you share complex terms that use the same stack of
>contact terms but would otherwise cross talk. The diodes allow
>one to optimize the number of contacts used by sharing common
>terms.
> Each relay contact can be used as a term in an equation. Normally
>open contact can provide inverting function and normally closed
>contact can provide isolation buffering ( needed for AC but can
>be optimized with diodes in DC ).
Oops!!
Should have said normally closed provide inverting and
normally open provide buffering.
> Designing with relays takes a slightly different mindset than
>with normal logic, like TTL. You have to think in terms of
>inverters and transmission gates. There are no NAND or NOR
>gates. The function of NAND and NOR is constructed by sharing
>the contacts of several relays and then using that shared
>stack to control the output ( that may be another coil of
>a relay ).
> Stacking contacts can provide AND like function and paralleling
>contacts can provide OR like function. Choice of normally
>open contacts provides OR and AND with inverted inputs,
>the Boolean equivalent of NAND and NOR.
> This takes a little more thinking of design because with double
>throw relays, one has to think of the source as providing the
>inverting and non-inverting signals. The contacts only provide
>OR and AND, depending on how they are arranged.
>Dwight
>
>
>>
>>Question: Wouldn't it be easier to implement an OR gate with no relays at
>>all (just two wires joining together)? Or would you need to use the relays
>>to keep the output voltage/amperage regulated?
>>
>>
>>Cheers,
>>Ade.
>>
>>
>
>
>
jos de waal <jos_dewaal(a)hotmail.com> wrote:
> I've asked my wife for her opinion on this and she said that she
> would instantly scrap and toss my stuff if she ever found herself in
> a similar situation. I can't blame her.
Have you instantly divorced her after hearing that in order to ensure
the safety of your collection?
I can't understand why everyone here is having so much difficulty with
their wives. Why did you marry them in the first place? Why in the
world would you want to marry someone who has no respect for your most
important Life's Work?
I would never even *date* a woman who does not share my most core beliefs,
and she must agree to protect our property with her life before there
can be any talk of marriage.
MS
Hiya
I found your email address while searching for information on Gemini
computers and Xebec controllers. I?ve recently acquired a Gemini Galaxy 3
with a hard drive but the version of CP/M it came with does not have the any
software for the hard drive. Basically do you have a any Gemini utility
software for the hard drive, and if so, can I please get a copy.
Many thanks
Richard
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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"50 Service" on an HP printer means that the fuser is not working (not
reaching an acceptably high temperature within an acceptable time period,
or, rarely, it's stuck on and overheating).
In these particular models, the fuser is a heated roller system, there is a
pressure roller (silicone rubber with a special "oil" on it to prevent
sticking) and a heating roller, a hollow aluminum tube (also with a special
silicon coating) with a heating element inside it. The heating element is a
very high power cylindrical quartz lamp running the length of the center of
the aluminum tube. The most likely cause of your problem is that the lamp
has burned out, although there are other possibilities (rare, however).
These can be replaced, but it may not be economical to do so. Also, examine
the roller carefully, if any of the coating on the hollow aluminum tube has
worn off, the tube should be replaced also (at some point, bare aluminum
will literally leave brown scorch marks on the paper).
These parts are available, but expect to pay $30 to $50 each for a new lamp
and tube. The job is not that difficult if you know what you are doing, but
substantially more difficult if you don't (big surprise, right?).
You may be able to buy an entire working fuser assembly for less, but the
lamp may have thousands of hours on it and the roller may be well worn. If
you plan to keep the printers, a "true fix" with new parts really is the
best way to go.
Be careful working in this area, the lamp is AC line operated, and the
roller is heated to nearly 400 degrees F. There are both shock and burn
hazards.
I have an actual factory service manual for the Laserjet II, I may scan it
and make it into a PDF for the classic computer documentation effort.
However, unlike Imsai, Altair, etc., HP is very much still in business and
may take legal action if their copyrighted manuals are put on the web or
otherwise distributed. I have found Laserjet IV service manuals on the web,
and I have them downloaded.
Just a note on economic viability, you can buy entire working HP 4 printers
-- HP 4 Plus, the 12ppm version -- for well under $50, so putting in a $60
repair on a vastly inferior Laserjet II is of questionable economic
viability.
Just found this on James Willings old site:
http://www.rdrop.com/~jimw/jcgm-vcf.shtml
Scroll down near the bottom; there is a picture of a 'DECsystem 10 I/O
rack'.
Does anyone know who this belonged to?
If there's a -10 I/O rack running loose without a -10 to talk to, I have a
-10 that's been missing its I/O rack for many years, since it was destroyed
consequent to a flood. I think I should talk to the owner of that I/O rack,
and soon!!!!!
Thanks
Mike
(latest aquisition at the corestore: http://www.corestore.org/tc08.htm)
http://www.corestore.org
You know, this whole dust up has me thinking. I wonder the following:
(1) if each one on the list should create and publish for "internal" (i.e.,
list) use a general collections list. I don't mean a complete inventory, but
rather a high-level summary of our collections, so that all of us are aware
as to what each of us posesses so in the absence of specific intentions in a
will people with specific backgrounds can help disperse the collection.
Maybe this database functionality could be added to the classiccmp.org site
as part of a "member profile" section.
(2) if we should appoint several members of the list to a team of collection
evaluators/dispersers. This group could consist of maybe 5-10 people each
with backgrounds in specific collections (i.e., a DEC guy, a Commodore guy,
etc.) so that they can evaluate and manage the dispersal of a member's
collection. The #1 guy would be responsible for making contact, and each of
us would at least let our relatives/wives/SOs know who that person is so the
call does not seem out of the blue.
This whole setup may sound too formal for a group without formal
organization, but I think it could minimize any future conflicts or hurt
feelings.
Rich
Rich Cini
Collector of classic computers
Build Master for the Altair32 Emulation Project
Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/
/************************************************************/
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org]On Behalf Of Fred Cisin
Sent: Sunday, September 26, 2004 9:14 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Made first phone call
When I die, I hope that y'all contact my friends and relatives
immediately.
The executor of my will would prefer that you bring a big truck,
and/or provide dumpsters.
If you don't know me well enough to know who to contact,
write to deadguy(a)xenosoft.com
--
Grumpy Ol' Fred
Geoffrey Thomas <geoffreythomas(a)onetel.com> wrote:
> > I think a more apt comparison is the US allowing the museums of Baghdad to
> > be looted while they secured the oil fields.
> [...]
> That was possibly negligent and unthinking rather than deliberate , a case
> of tunnel vision.
It *WAS* deliberate. It was the actual reason for the whole war. The
war was not about oil: Iraq under Saddam was producing a lot more oil
than it does now, and They don't need that oil in the first place since
they have Zero Point Energy technology in Area 51. The war was about
Eden (Iraq's original ancient name), about the Navel of the Earth, and
about control over the entire planet and beyond, over the rest of the
solar system. They wanted Saddam out because he was trying to bring the
Anunnaki back to Earth. He was able to reestablish communication with
them by undigging and reactivating the interplanetary communication
equipment they left there. The entire war was about stopping the return
of the true original gods and goddesses and suppressing the ancient
advanced technologies and their technical documentation and historical
records, which is what they stole from the Baghdad Museum.
MS,
exopolitical loyalist and friend of Anunnaki, and by association of
Saddam Hussein. Long live Saddam!
http://ivan.Harhan.ORG/~msokolov/
I have an Emulex UC08 SCSI <-> QBus board I'm trying to make work.
It actually has 2 controllers on the board.
I can get into the firmware on both controllers fine -- when no drives are
connected.
However, when I connect a SCSI drive to a controller,
I can not get into the firmware for that controller.
It lights up the 3 error LEDS and puts a code "231" <octal> into the SA
register low byte.
Both controllers do this.
I've tried several disk drives and a tape drive.
A Zip100 SCSI drive did let me get into the firmware, but I couldn't but
System Can't See It.
Got the UC08 recently and have not got it working yet.
Does anyone know what UC08 error code "231" is?
The board firmware is Rev P.
The UC08 manual on bitsavers is current through Rev H and stops at octal
error code "121".
I'm thinking it's a cable problem since the firmware will run when no drive
is connected,
and won't run when one is.
One thing, the UC08 is the S handle flavor that has 2 HD50 male connectors.
It's made to go to a cabinet kit that converts the HD50 to 50 pin .1" header.
I'm using a known good SCSI HD50M to Centronics 50 pin cable.
But I had to get a HD50 F<->F gender bender to hook the cable to the UC08.
Any ideas?
Oops, not wanting to set Michael off again,
Any ideas that might help me solve the UC08 problem?
:-)
Ed K.
