> U - his PDP-11/34 most certainly does use switching power
> regulators. ;)
True, but I still haven't had major capacitor problems in one.
-tony
>
> I had to do some cap replacement on some older Motorola tube radios,I have
> some basic soldering skills. I was under the impression that the capacitors
> in computer equipment this big from this year would have been of better
> quality and it would not be an issue.
In general I will agree wit
> Thank you for the detailed information. I need to figure out how im going
> to get it out of the rack and moved to a place where i can test it over the
> next couple days where it will not be in the way. Ill find some way to do
> a dummy load and do an extended test to be sure the supply is wor
On 07/17/2015 04:03 PM, Eric Smith wrote:
Looking for an MC68451 datasheet (or scan). Most of the ones that turn
up from the usual database sites are actually for the MC68450 DMA
controller, which is entirely unrelated. The only one I found that is
actually for the MC68451 was "Advance Informatio
I have it. I'll postprocess and upload it and email you the pinout page
On 7/17/15 4:03 PM, Eric Smith wrote:
Looking for an MC68451 datasheet (or scan). Most of the ones that turn
up from the usual database sites are actually for the MC68450 DMA
controller, which is entirely unrelated. The onl
Looking for an MC68451 datasheet (or scan). Most of the ones that turn
up from the usual database sites are actually for the MC68450 DMA
controller, which is entirely unrelated. The only one I found that is
actually for the MC68451 was "Advance Information" from a databook,
and did not include the
I've got one each of the Heurikon HK 68/ME-2 and HK 68/M10-3 multibus
boards. There are brochures on bitsavers, but does anyone have
documentation, schematics, or software for either of these?
It also would be nice to get documentation, or at least switch and
jumper settings, for the Micro Memory
Sure
On Friday, July 17, 2015, Rod Smallwood
wrote:
> Hi Guys!
>Further to my previous email.
> If anybody would like to see the artwork I can send you a copy.
> Its in *.svg format.
>
> Regards
>
> Rod
>
>
U - his PDP-11/34 most certainly does use switching power
regulators. ;)
On 7/17/2015 4:06 PM, John Robertson wrote:
> On 07/17/2015 11:53 AM, Mouse wrote:
>>> I do find this witch-hunt against capacitors to be curious, given how
>>> few I've found to have failed. I suspect a lot of it comes
I tend to agree with your hunch.
On 7/17/2015 1:55 PM, Todd Killingsworth wrote:
> I suspect part of the "swap'em ALL out" mentality comes from the 90's when
> some botched industrial espionage had some of the bottom-tier cap
> manufacturers using a dodgy electrolytic formula for their caps. Thes
That might be a little different -- much more recent - presumably in the
ear of flat screens and PCs where there have been times when
manufacturers got fed bad capacitors for their boards - which then
failed later. IBM replaced a whole series of motherboards in one
organization that I worked at be
Replace - no, I don't agree - especially not for those of us who don't
have the kind of budget that your organization has. In my experience,
for equipment of this quality and vintage, 95% or more of the time an
hour to a few hours of re-forming is all that is necessary - and as Tony
has pointed ou
On 07/17/2015 11:53 AM, Mouse wrote:
I do find this witch-hunt against capacitors to be curious, given how
few I've found to have failed. I suspect a lot of it comes from
audiophools who think this is the way to fix anything...
Perhaps. But not all of it, certainly. I'm currently four for fou
I had to do some cap replacement on some older Motorola tube radios,I have
some basic soldering skills. I was under the impression that the capacitors
in computer equipment this big from this year would have been of better
quality and it would not be an issue.
I have someone scheduled to come out
I was operating the panel when i first got it, now the numbers do not light
up, panel is unresponsive, and run light stays lit.(just describing the
behavior, i will not start it back up till I work on the power supply)
On Fri, Jul 17, 2015 at 3:50 PM, devin davison wrote:
> I had to do some cap
Thank you for the detailed information. I need to figure out how im going
to get it out of the rack and moved to a place where i can test it over the
next couple days where it will not be in the way. Ill find some way to do
a dummy load and do an extended test to be sure the supply is working
prop
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of tony
duell
> Sent: 17 July 2015 20:23
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: PDP 11 gear finally moved
>
>
> > When I repaired my VT100s I had to replace all the electr
On 2015-Jul-17, at 11:42 AM, tony duell wrote:
>>> It is generally a good idea to re-form electrolytic capacitors in power
>>> supplies, and to bench check the power supplies (under some kind of
>>> load) before actually applying power to the whole unit.
>>
>> It is always a good idea to replace e
> When I repaired my VT100s I had to replace all the electrolytic caps on the
> monitor control board to cure the screen wobble. Before doing so I had
> reformed them all and I had tested them all for ESR and they had all tested
> fine so I was unable to determine which of them was the bad one. Pe
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of tony
duell
> Sent: 17 July 2015 19:56
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: PDP 11 gear finally moved
>
> >
> > Perhaps. But not all of it, certainly. I'm currently f
>
> Perhaps. But not all of it, certainly. I'm currently four for four
> fixing dead flatscreens by re-capping their power supplies; I imagine
> others have similar experiences. It's not a huge stretch to imagine
This could be taken to show that modern capacitors are not reliable, and given
th
some are good some are bad.
http://www.badcaps.net/
here is all the info you ever need on today's bad caps
not so much on yesteryears bad caps
On 7/17/2015 11:53 AM, Mouse wrote:
>> I do find this witch-hunt against capacitors to be curious, given how
>> few I've found to have failed. I
I suspect part of the "swap'em ALL out" mentality comes from the 90's when
some botched industrial espionage had some of the bottom-tier cap
manufacturers using a dodgy electrolytic formula for their caps. These
caps would have a frequent failure rate..
While not an issue for pre-90's electronics
> I do find this witch-hunt against capacitors to be curious, given how
> few I've found to have failed. I suspect a lot of it comes from
> audiophools who think this is the way to fix anything...
Perhaps. But not all of it, certainly. I'm currently four for four
fixing dead flatscreens by re-c
>
> > It is generally a good idea to re-form electrolytic capacitors in power
> > supplies, and to bench check the power supplies (under some kind of
> > load) before actually applying power to the whole unit.
>
> It is always a good idea to replace electrolytic capacitors in power supplies.
Cou
>
> I was trying to enter a short program at the front panel and there was a
> clicking sound followed by a burning smell. I cut the power, the front
> panel is unresponsive now, so I'm going to need to look over the power
Did you see anything on the panel when it died (was the numeric display st
It is generally a good idea to re-form electrolytic capacitors in power
supplies, and to bench check the power supplies (under some kind of
load) before actually applying power to the whole unit.
JRJ
On 7/17/2015 11:49 AM, devin davison wrote:
> Devin here, I had asked for advice on how to move a
> It is generally a good idea to re-form electrolytic capacitors in power
> supplies, and to bench check the power supplies (under some kind of
> load) before actually applying power to the whole unit.
I am not sure either would have done much good here. The OP said it
ran OK for an hour or so, w
> It is generally a good idea to re-form electrolytic capacitors in power
> supplies, and to bench check the power supplies (under some kind of
> load) before actually applying power to the whole unit.
It is always a good idea to replace electrolytic capacitors in power supplies.
The rest of the a
I'm using a genuine DEC RRD45 so no sector size issue and it's worked fine
with burned CDs in the past to load my VAX machines ... I've never had too
much trouble with burns ... I think I just got a funky image from HP ...
other people have reported issues with it ... I could see the RRD45 getting
With all this talking about keys ...
Anybody know where to get a spare one for the system above?
Cheers & thanks ...
Devin here, I had asked for advice on how to move a PDP 11 as well as how
to lock the heads on the RL Drives. It was quite a move. Ive never driven
in a large city before, dealing with traffic was more trouble than it was
to move and load up the equipment. Anyhow, i put a few images of what I got
u
thanks for the info. The Alpha in question is a 2100 4/275. It works
enough to connect to the web but I need to fix one of the drives.
On Fri, Jul 17, 2015 at 12:22 PM, John Willis
wrote:
> On Fri, Jul 17, 2015 at 7:53 AM, william degnan
> wrote:
>
> > related question - I was not able to mak
> That wasn't all that uncommon in the microprocessor world--once the
> price dropped sufficiently, doing multiuser applications by giving each
> user their own CPU was practical. Molecular was another outfit that did
> practically the same thing.
>
> Dual-CPU setups, where the "weaker" of the t
On Fri, Jul 17, 2015 at 7:53 AM, william degnan
wrote:
> related question - I was not able to make a bootable/readable image from
> the ISO I have 7.3, although it might have been a bad source. Is there a
> best way/ best software to make a usable 7.3 install CD that will work in
> an Alpha? J
Thanks, Richard! I'll try some of the ISOs I received and failing that I
might take you up on your offer. I'm going to get this box running VMS one
way or the other :O
Best,
Sean
On Fri, Jul 17, 2015 at 11:25 AM, Richard Loken <
richar...@admin.athabascau.ca> wrote:
> On Thu, 16 Jul 2015, Sean
I've got a few to try so I'll burn those today and see what happens. For
the 8.4 disc I have, I used the same process to burn the disc that I did
for OpenVMS VAX V7.3 ... I just copied the *.iso to a Mac and used Disk
Utility to burn the *.iso just to a regular CD-R. For V7.3 VAX this
produced a pe
I'm all set; thanks to all that responded! I've got a few different *.isos
to try and hopefully one of them will be palatable to my old 3000/400 ...
I'd rather run VMS on it than Tru64 :O I truly appreciate it!
Best,
Sean
On Thu, Jul 16, 2015 at 7:19 PM, Sean Caron wrote:
> Anyone got an ISO
On 07/16/2015 11:45 AM, Mike Stein wrote:
Not the same thing of course but remotely on-topic, and I never miss an
opportunity to put in a plug for Cromemco:
By comparison, Cromemco used semi-autonomous 4MHz Z80A SBCs for their
I/O processors, with 16KB of local RAM and up to 32KB of ROM;
commu
Sector size?
On Fri, Jul 17, 2015 at 8:25 AM, Richard Loken <
richar...@admin.athabascau.ca> wrote:
> On Thu, 16 Jul 2015, Sean Caron wrote:
>
> > Anyone got an ISO handy? Trying to get my 3000/400 up; V7.0 firmware; and
> > it does not like the OpenVMS V8.4 ISOs I got from HP ... I do have a
> v
On Thu, 16 Jul 2015, Sean Caron wrote:
> Anyone got an ISO handy? Trying to get my 3000/400 up; V7.0 firmware; and
> it does not like the OpenVMS V8.4 ISOs I got from HP ... I do have a valid
> Hobbyist license ... please chat with me off-list?
I have a 7.2 CDrom and a 7.3-1 CDrom that I can send
related question - I was not able to make a bootable/readable image from
the ISO I have 7.3, although it might have been a bad source. Is there a
best way/ best software to make a usable 7.3 install CD that will work in
an Alpha? Just curious as to why I was not able to make it work. I make
CD'
Hi Guys!
Further to my previous email.
If anybody would like to see the artwork I can send you a copy.
Its in *.svg format.
Regards
Rod
Hi Guys!
I now have prototype artwork for the two types of 8/e
front panel.
They differ only in the switch markings.
They do both have the same extra (but cosmetic only) features over the
first run.
Regards
Rod
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