My first exposure to a computer at home was a BBC Micro with 32kB of RAM and
32kB of ROM. Included in this was a 16kB BASIC ROM which was regarded as fast
and powerful, featuring 32 bit integer variables, 40 bit floating point
variables, variable length strings, structured programming constructs
Pin 2 is TXD+ so I suppose that the RX side still works. I have no
suitable storage for this system (well, I have some RF71 drives but not
the carriers that would be needed to connect to the backplane properly),
so I was planning to netboot from a SIMH instance on a PC. However, to
configure
>
> Thanks for the information so far, folks.
>
> Now this boils down to interpreting the final CMS record for each file.
> I'm not clear on how to interpret them, however. For example,
>
>> Block 10, 87 bytes:
>> 00 02 c3 d4 e2 d5 01 76 00 01 c1 f1 01 75 00 00 c6 |.CMSNA1F|
>>
>
> Seems like rather than going through MUSIC/SP it'd be easier to just fire
> up VM/CE 1.2 (which is VM/370 r6) and use CMS TAPE (which is present)
> directly from the CMS UI. You can probably attach the file you've got as a
> tape device; not entirely sure Hercules will like the format, but it
>
> I'll dig into it a bit today, but I believe that I'm on the right track.
>
> Unfortunately, the data itself is client-proprietary, so no sharing
> there, sorry.
>
Hi Chuck,
I think I pulled the files out of a similar tape image for you about 8 years
ago using the CMSTAPE utility on
Hi Sellam,
It's on the other side of the city from me but I'm probably the nearest
you are likely to come across. Send me an email and we can discuss it.
Regards,
Peter Coghlan.
>
> I'm looking for someone near Glasnevin near Dublin, Ireland who would be
> willing to pick up an item for me and
Fred Cisin wrote:
On Tue, 29 Aug 2023, Tom Hunter via cctalk wrote:
My trick for successful landing the CDC Cyber/6000 series lunar lander
version was to set the initial height above the moon's surface to the
minimum height of 1' and then let it drop. I never successful landed from
the
>
> Gentles,
> The problem is I have stuff no one wants. Large plotter, dec writer in need
> of repair, Large Alpha server
> Suggestions?
> Dave
>
Dave,
I might be able to give a home to a large Alpha server. I've got a large
heap of faulty Alphas so I would be particularly interested if it
>
> I have a Gesswein MFM emulator from decromancer.ca; who offer an adaptor
> that yields a 2nd MFM data connector.
> I'll use mine in a Microvax 2000. Does anyone know how to hook it up as
> two MFM drives in a Microvax 2000?
>
> The vendor sold a 1in high adaptor box, BA40A, with DD50
>
>>> Anyone seen those before, and is it actually SCSI, or is it something else?
>
>> Common on old Sun SCSI stuff, it's a DD-50. Could be something else, but
>> they were indeed used for SCSI termination.
>
> Given what else was in there, this makes sense, and they look exactly like a
> SCSI
Rick Bensene wrote:
> Earlier today, I wrote:
>
>>> Doubtful that VW Bug was on the Autobahn at the time, and, while the
>>> advertisement was very
>>> novel with a full-on minicomputer in the back seat of a VW Bug, the amount
>>> of data
>>> potentially being transported was likely only 4K
>
> This evening I went to check Vstart for any oscillation. However, all of a
> sudden, the current draw is down to 85mA and PWM has started working. I am
> at a loss to explain it. I wondered if there might be a dry joint, but I
> have tried a few light taps and shakes and it continues to work.
> >
> > -Original Message-
> > From: Peter Coghlan via cctalk
> > Sent: 10 May 2023 12:04
> > To: 'General Discussion: On-Topic and Off-Topic Posts'
> >
> > Cc: Peter Coghlan
> > Subject: [cctalk] Re: Rainbow H7842 PSU Fault
> >
>
> I will do all the suggested checks, but I won't be able to do this for a
> number of days. However, I wanted to understand something in the meantime.
> The conditions I am applying are (I think!) what would happen during
> startup, and during startup the control board has to make the PWM
>
> I am going to read your answer more carefully later. But I wanted to check
> one thing. I measured the base-emitter voltage as negative in both cases,
> and yet the TIP121 appears to be conducting on the bad PSU. Surely that
> means that the TIP121 is not working correctly?
>
I'd be very
>
>
> > -Original Message-
> > From: Peter Coghlan via cctalk
> > Sent: 07 May 2023 10:34
> > To: General Discussion: On-Topic and Off-Topic Posts
> >
> > Cc: Peter Coghlan
> > Subject: [cctalk] Re: Rainbow H7842 PSU Fault
> >
&g
>
> The comments about the tolerance of the 7812 were right, it doesn’t
> appear to be an issue with the replacement 7812 regulator because when
> I tried using the bench PSU to feed exactly 12V to the circuit from the
> output of the 7812 the comparator still gave the wrong result. It was
> still
It seems a bit odd that a power supply from someone like DEC of that era would
be designed to depend so critically on the absolute value of a rail used
for startup purposes.
The output of the replacement 7812 varying between 12.2V and 12.4V suggest that
the 7812 itself could be faulty. Or
>
> Yes, that is certainly the problem. Presumably more current is flowing
> through the current sense resistor than should be.
>
Do you mean when the power supply is connected to the mains here?
If we are still talking about the test case when you are applying an external
supply to Vstart only,
Hi Rob,
>
> Thanks for the various replies. Here are my responses and further
> observations.
>
> I was asked if I had a load on the PSU while bench testing it. The answer to
> that is no.
>
I initially thought that the +0.6V on the -12V line might have been arriving
there via a load which was
>
> This seems to be because I measure a steady 0.6V on pin 6 of the transformer
> (p4, PSU Sheet 3). I just can't imagine where it might be coming from as the
> chopper won't be running. I had previously removed the transformer and there
> are no shorts between the pin 5-pin 6 winding and any of
>
> This seems to be because I measure a steady 0.6V on pin 6 of the transformer
> (p4, PSU Sheet 3). I just can't imagine where it might be coming from as the
> chopper won't be running. I had previously removed the transformer and there
> are no shorts between the pin 5-pin 6 winding and any of
Fred Cisin wrote:
On Mon, 17 Apr 2023, AT Customer Service via cctalk wrote:
Sorry, I forgot to post the location. I'm in Kent, Washington. USA.
disregard the AT customer service. Have E-mails in to them. not sure
what going on there, but its at anything is possible.
With a user name of
>
> There are some nice mixed signal oscilloscopes made by Rigol (Chinese) at a
> very affordable price.
>
Until just over a year ago, buying very afforadable Russian oil and gas also
seemed like a great idea with no downsides compared to getting these products
elsewhere.
Regards,
Peter Coghlan.
in the dark.
You seem to know something about it? Can you enlighten those of us that don't?
Regards,
Peter Coghlan.
Patrick Finnegan wrote:
>
> If by "coup" you mean rescued from getting turned off, then yes.
>
> Patrick Finnegan
>
> On Sat, Jan 28, 2023, 04:44 Peter
It appears there was some sort of coup in July 2022. The mailing list owner
was apparantly replaced and the list was moved from where it was previously
hosted to somewhere new. There were some vague declarations about needing to
deal with archives but I never saw any formal or informal
Paul Berger via cctalk wrote:
Indeed not not all SCSI terminators are created equal, there where three
types of signalling used Single Ended (SE) High Voltage Differential
(HVD) and Low Voltage Differential (LVD). LVD was created to squeeze a
bit more speed out of parallel SCSI.
That's
I telephoned the customer service department at a railway company. I think
the person I spoke to knew less about trains than this thing knows about
a PDP-11. Maybe they are using AI to do telephone answering now?
Regards,
Peter Coghlan.
Jay Logue via cctalk wrote:
I don't know about
Chuck Guzis via cctalk wrote:
> On 1/17/23 19:14, Chris via cctalk wrote:
>> My worst nightmare is some fiendish AI turning me into a really beautiful
>> woman. Maybe with no arms. The Terminator future doesn't seem so bad by
>> comparison.
>>
> My worst nightmare, which is sure to become reality
Peter Corlett wrote:
> On Tue, Jan 17, 2023 at 10:16:18AM +0000, Peter Coghlan via cctalk wrote:
> [...]
>> How about translating code from Z80 which has several registers to 6502
>> with rather fewer? That would seem to need some more intelligent thinking
>> on how to
Fred Cisin wrote:
How well does it do on something "simple", and less esoteric, such as
translating FORTRAN to BASIC?
On Mon, 16 Jan 2023, Chuck Guzis via cctalk wrote:
How about FORTRAN to RPG?
Certainly more of a challenge!
But, a good way to quanitfy how far along they are getting on it.
>
> Windows 2003 and XP is about as obsolete now as the IBM PC was in 1995.
> Probably more so. XP is popular on Vogons but I'm sure considerably less
> then 5% of computers actually host it.
>
> There's also the issue of beating a dead horse. There will always and
> forever (and forever...) be
he unit was
> powered on, it does not seem to be overheating.
>
> On Tue, Dec 20, 2022 at 1:09 PM Peter Coghlan via cctalk <
> cctalk@classiccmp.org> wrote:
>
>> I had something similar with a VT220. I didn't get around to
>> investigating it
>> b
I had something similar with a VT220. I didn't get around to investigating it
before the flyback transformer failed :-(
I can only suggest to run it for a short time with the cover off and the lights
out while looking for any glows / discharges around the flyback transformer,
the EHT cable, the
I am looking for advice to get the 11/34 system up and running. I have
started to put together a site to document my progress, to stay on track
with the repair effort. The system has 2 rl02 drives, and an attached 9
track tape drive. I had worked to repair a power supply issue at first,
>
> I think that a good thing is to ramp up the input voltage slowly. Use a
> bench PSU to supply the Vstart voltage and then use a variac with
> insulation transformer to feed the rest if the supply. Use some small
> loads on the 5V and 12V outputs. Now you can safely probe the PSU and
>
It is often possible to infer the component ratings needed from the other
components around them. A component in the base circuit of a transistor is
likely to experience lower currents and voltages than one in the collector
circuit.
In this case, we can see from Tony's diagram that there is a
Don,
Does the url suggest you may have searched for a H5901 rather than a H9501?
Regards,
Peter Coghlan.
>
> NTE seems to turn up these possibilities for a H9501.
>
> https://www.nteinc.com/search/search/search.php?ss360Query=H5901
>
> Don Resor
>
> Sent from someone's iPhone
>
>> On Nov
g rectifiers when
power is applied through the light bulb and a lesser or no voltage rise
on an output which has a shorted rectifier or other issue that needs
closer inspection. It also means there is no need to hide behind the
sofa when you switch it on :-)
Regards,
Peter.
>
> Thanks
>
Hi Rob,
I'm only guessing here. I think the sequence may have been that the
main switching transistor failed first as it would be under more stress
than a diode in the base circuit. If the transistor shorted E-B-C then
the HT would become connected to the circuitry at it's base which would
be
Maciej W. Rozycki via cctalk wrote:
>
> Same here, five 1800uF 25V caps to replace in the H7821 according to my
> notes. Overall if you spot a cap that says SXF on it, then replace it
> right away whether already leaking or not. These were made by Chemi-con.
> Other Chemi-con lines
On 15/11/2022 10:06, Antonio Carlini via cctalk wrote:
On 24/10/2022 21:07, Antonio Carlini via cctalk wrote:
the bitsbox one may be a teensy bit to large but the ebay one should
fit nicely. Neither is too expensive even with postage so I'll buy a
few, given that I do have a fair few PSUs
Jon Elson via cctalk wrote:
On 11/9/22 20:52, Warner Losh via cctalk wrote:
I have a few old exabyte tapes of possible historic value. Who can I pay to
get them recovered that has the best chance of success?
Very difficult. We were a big user of Exabyte drives for
processing of physics
>
> I'm seeking to buy a Sun Microsystems monitor with a 13W3 interface.
>
> Ideally somewhere around central Europe for pickup in person. But I'm happy
> to consider shipping options as well.
>
I have a GDM1604B40 monitor (Sony Trinitron design) with a 13W3 connector.
I don't know if it works
Antonio Carlini via cctalk wrote:
On 01/11/2022 23:10, Peter Coghlan via cctalk wrote:
I've taken the boards out of a whole bunch of H7821 and H7822 PSUs to
replace the electrolytics without removing the fans. It was difficult at
first but the more I did, the easier it got. I did come across
On 24/10/2022 21:07, Antonio Carlini via cctalk wrote:
the bitsbox one may be a teensy bit to large but the ebay one should
fit nicely. Neither is too expensive even with postage so I'll buy a
few, given that I do have a fair few PSUs knocking around.
Turns out both sets of X2 caps I bought
>
> I've been trying to do a little work on the RDI BriteLite IPX I have here, but
> when it runs more than a few minutes the LCD just blanks out white. The
> machine
> seems to still respond to commands, so it seems like it's something with the
> display hardware. Even powered off and back on it
I'm working on cleaning up a bit of battery leakage in a MicroVAX 3100
Model 10 and while it's apart I decided to look inside the PSU (an
H7822-00).
It's nice and clean inside with no bulging caps. What it does have is an
X2 capacitor, as shown here:
Mike Loewen wrote:
On Wed, 14 Sep 2022, Jonathan Katz via cctalk wrote:
I have a TVI-921C at the museum. I power it on and it beeps
continuously. One long, solid tone that does not stop until I power it
off. How do I start diagnosing this?
Check the power supply voltages.
After
I'm not in the UK but I think I have a COMAL paged rom image for the BBC Micro
somewhere. I don't think I ever tried using it, I have no documentation
for it and I don't know anything about it but if there is any interest, I will
try to find it.
Regards,
Peter Coghlan.
>
> This is a query which
Boston GB, Boston USA or Boston somewhere else?
Regards,
Peter Coghlan
(No Bostons anywhere near where I am anyway).
>
> Looks like both of them are North of Boston, but one is like a 19 hour drive
> away and one is a half hour drive away.
>
> I'd guess the half hour one. :D
>
> -Paul
>
>
>
>
> For an extra $1 now you can get integrated WiFi (and Bluetooth but
> there isn't any BT software support yet) in the form of the $5 Pi
> Pico W, so that's one route to talking to an IP network for IoT or
> something like this.
>
> A neat thing about the Pico is that you can do hard real-time
>>
>> If I am trying to calculate the height a sea harbour wall needs to be, can I
>> not consider the height of the tide and the height of the waves separately
>> and add them together, just to make it easier to work it out even though I
>> know that it would be physically impossible to
Wayne S wrote:
>> On May 12, 2022, at 09:56, Peter Coghlan via cctalk
>> wrote:
>>
>> Toby Thain via cctalk wrote:
>>>> On 2022-05-11 7:02 p.m., Peter Coghlan via cctalk wrote:
>>>> Given the normal usage that has evolved for the t
Toby Thain via cctalk wrote:
On 2022-05-11 7:02 p.m., Peter Coghlan via cctalk wrote:
Given the normal usage that has evolved for the terms DC and AC rather than
their dictionary definitions, I would suggest that the current that gets
passed by a rectifier has both a DC component and an AC
>
> Wayne: AC DC terminology has been well documented since the 1800's.
> Don't try to reinvent the terms or no one will know what you are talking
> about.
> I answered a few things below...
>
They didn't have switch mode power supplies in the 1800s. Terms like AC and
DC as understood back
Maciej W. Rozycki wrote:
> On Thu, 12 May 2022, Peter Coghlan via cctalk wrote:
>
>> Anyway, the good news is that I think I have found the source of the
>> problem. One of the capacitors used to filter the (DC?, pulsed DC?,
>> rippled DC?, biased AC?) supply to the 9V r
to DC ?
>
>
> Sent from my iPhone
>
>> On May 11, 2022, at 01:36, Peter Coghlan via cctalk
>> wrote:
>>
>> The ripple on the rectified 5V and 12V supplies gets transformed into an
>> isolated AC source for the 9V supply.
>
I recall discussion of this issue on the mailing list a number of
times in the past, often involving more heat than light. I'd suggest
searching the mailing list archives if this were possible. I had a
quick look just now but I was only able to find this:
Christian Corti via cctalk wrote:
On Tue, 10 May 2022, Peter Coghlan wrote:
> Ahead of the 78M09 is another TO220 package marked D45H8 which seems to
> be a transistor. Then I am completely lost. I can't find the rectifier
That TO220 part would be the rectifier. It either has two legs (simple
Peter Coghlan wrote:
> Tony Duell wrote:
> > On Sun, May 8, 2022 at 1:02 PM Maciej W. Rozycki via cctalk
> > wrote:
> >
> > > In the H7821 it's -9Vdc return pairing with -9Vdc supplied on the yellow
> > > wire (an isolated circuit). Pin numbers 14 & 13. Try measuring voltage
> > > across the
Tony Duell wrote:
> On Sun, May 8, 2022 at 1:02 PM Maciej W. Rozycki via cctalk
> wrote:
>
> > In the H7821 it's -9Vdc return pairing with -9Vdc supplied on the yellow
> > wire (an isolated circuit). Pin numbers 14 & 13. Try measuring voltage
> > across the suspicious connections as any
Hi Maciej,
>
> >
> > What is H7826 used in? I don't think I have any of those.
>
> DECstation 5000/1xx systems and TURBOchannel Extender boxes. Not sure if
> anything else.
>
Ok. I have VAXStation/MicroVAX and Alpha systems but no DECStations so that
explains why I haven't seen them.
>
> >
Hi Maciej,
>
> Right, my notes indicate Nichicon PL parts might be problematic too, e.g.
> one at 4700uF/10V on 5V output of the H7826 PSU.
>
What is H7826 used in? I don't think I have any of those.
>
> I can confirm now Nichicon PF 47uF/35V parts to be the source of an issue
> with my Bel
Hi Maciej,
Thanks for your input.
"Maciej W. Rozycki" wrote:
>
> Lying on a side would also permit leaking, I've seen an H7821 damaged in
> storage that way. Gravity only helps with the leads up.
>
I have lots of H7821s that were on their side for a few years and leaked a
lot but I also have
"Maciej W. Rozycki" wrote:
>On Mon, 2 May 2022, Peter Coghlan via cctalk wrote:
>
>> Thankfully, it doesn't seem to have been there long and didn't get a chance
>> to spread around the board. Bizarrely this capacitor has it's legs pointing
>> upwards and manag
"Maciej W. Rozycki" wrote:
>On Mon, 2 May 2022, Peter Coghlan via cctalk wrote:
>
>> Thankfully, it doesn't seem to have been there long and didn't get a chance
>> to spread around the board. Bizarrely this capacitor has it's legs pointing
>> upwards and manag
I wrote:
>
> At least the H7822 does not seem to suffer from the leaky capacitor problem
> like the H7821 does.
>
Well, it's made a liar of me already. While checking over my previous work
replacing the zener diode to make sure I didn't break something else, my
eye was drawn to a ring of sticky
I'm having a lot of problems with DEC power supplies. Newly failed ones
are getting added to the end of the queue quicker than I am managing to
pop fixed ones off the top of the queue :-(
The latest one to give trouble is a H7822 in a MicroVAX 3100. This machine
apparantly never got deployed
A few months ago, I mentioned a faulty H7816-BA power supply in a rackmount
DEC 3000/600 Alphaserver. I finally got around to looking at it again
recently. I hoped I had an identical working power supply to compare it to
but I didn't. It turns out what I had is two working H7816-AA power
I had to desolder a fairly large number of 14/16 pin ICs from a two layer
PCB recently. I had an basic soldering iron and a spring loaded solder
sucker thing. I also had some wick but never having had good results with
this, I decided not to bother trying it this time.
I was aware of the idea
at a local recycler is asking for one (which was around
$100) is fair.
On 4/15/22 3:30 AM, Peter Coghlan via cctalk wrote:
It's worth what someone is willing to pay for it and this will vary
widely.
I got one for EUR 20 in 2006. I didn't think this was a bargain because
I was under the im
It's worth what someone is willing to pay for it and this will vary widely.
I got one for EUR 20 in 2006. I didn't think this was a bargain because
I was under the impression I was getting it for free before I travelled
to pick it up. The previous owner had no further use for it and needed
the
I have several difficult slides in my H960 rack.
What is the best lubricant for the slides?
I was wondering if graphite would work better than oil due to the fact
that it won't pick up dirt and dust.
Powdered graphite for lubricating locks?
I wouldn't like to have conductive stuff like
"Maciej W. Rozycki" wrote:
>On Sat, 5 Feb 2022, Peter Coghlan via cctalk wrote:
>
> > > This PSU seems to have been used across various Cisco devices and I had
> > > one fail several years ago in a WS-C1202 Ethernet/FDDI switch, also
> > > having
>
know if
> there was a lower profile model).
>
> Thanks,
> Jonathan
>
> --- Original Message ---
>
> On Saturday, February 5th, 2022 at 09:17, Phil Blundell via cctalk
> wrote:
>
> > On Thu, Feb 03, 2022 at 06:06:10PM +, Peter Coghlan via cctalk wrote:
>
Phil Blundell wrote:
>
> Does that PSU have a PWM controller IC, or is it built entirely from
> discretes?
> If there is an IC driving the chopper transistor then you may be able to get
> some clues about the likely characteristics of the transistor from the IC
> datasheet.
>
It's all discretes.
"Maciej W. Rozycki" wrote:
> On Thu, 3 Feb 2022, Peter Coghlan via cctalk wrote:
>
>> Today I finally managed to check it out. The ceramic F4A mains input fuse
>> beside the power switch on the back panel had blown. When I opened it up,
>> I found a POWER-ONE
I have a Cisco IGS router which hasn't worked for a long time. When I was
last using it several years ago, it occasionally crashed and restarted.
This turned out to be due to a poor contact on a connection in the
cable going from the output of the power supply to the main board. I
cleaned the
On Wed, 19 Jan 2022 at 12:00:33 +0100, Peter Corlett via cctalk wrote:
>On Tue, Jan 18, 2022 at 04:47:36PM -0700, Grant Taylor via cctalk wrote:
>> On 1/18/22 2:21 PM, Peter Coghlan via cctalk wrote:
>>> https://www.thisiswhyimbroke.com/floppy-disk-table/
>> I like it!
On Wed, 19 Jan 2022 at 04:06:59 -0800, D. Resor via cctalk wrote:
>
> There was also a 5.25" diskette which was nicknamed "IPL" for "initial
> program load", and an interface board which was installed into the
> typewriter and was referred to as the "IBM Typewriter Modularity Option".
>
Hi Don,
On Tue, 18 Jan 2022 at 13:38:32 -0700, Adam Thornton via cctalk wrote:
>
> I wish I'd kept some. I had some AOL CDs from slightly later that made
> decent coasters for decades. Although I guess with the shutter, the floppy
> wouldn't really have made a very good coaster.
>
I can only conclude
On Wed, 12 Jan 2022 at 17:28:33 -0600 Richard Schauer via cctalk wrote:
On Wed, 12 Jan 2022, Peter Coghlan via cctalk wrote:
They do have spikes of solder sticking out from the positive ends
Yes, those are tantalum caps. The "hat" as I've always called it marks
the po
On Wed, 12 Jan 2022 at 19:30:58 +, Peter Coghlan via cctalk wrote:
On Wed, 12 Jan 2022 at 11:02:47 -0600 Jon Elson via cctalk wrote:
On 1/11/22 5:17 PM, Peter Coghlan via cctalk wrote:
Thanks Jon.
Here is a badly focused picture of the suspect components:
http://www.beyondthepale.ie
On Wed, 12 Jan 2022 at 11:02:47 -0600 Jon Elson wrote:
On 1/11/22 5:17 PM, Peter Coghlan via cctalk wrote:
Thanks Jon.
Here is a badly focused picture of the suspect components:
http://www.beyondthepale.ie/cctech/p1010198.jpg
WOW, I don't know what those are! They look like big
ceramic
On Wed, 12 Jan 2022 at 11:02:47 -0600 Jon Elson via cctalk wrote:
On 1/11/22 5:17 PM, Peter Coghlan via cctalk wrote:
Thanks Jon.
Here is a badly focused picture of the suspect components:
http://www.beyondthepale.ie/cctech/p1010198.jpg
WOW, I don't know what those are! They look like big
t it is working to help you
> reveal the bad component. In case the power supply has any inductors that
> might suffer from a shorted tant, I would remove and use my own bench supply
> as described above.
>
> Good luck!
>
> 73 Eugene W2HX
> Subscribe to my Youtube Channel:
On Tue, 11 Jan 2022 13:57:07 -0600, Jon Elson wrote:
On 1/11/22 10:40 AM, Peter Coghlan via cctalk wrote:
I have a rackmount DEC 3000/600 Alphaserver containing a H7816-BA power supply
which doesn't work. As I mentioned before, this power supply is a real pig
to work on.
I also have two
I have a rackmount DEC 3000/600 Alphaserver containing a H7816-BA power supply
which doesn't work. As I mentioned before, this power supply is a real pig
to work on.
I also have two tabletop DEC 3000/600 Alphaservers which contain H7816-AA
power supplies which are similar but not identical. The
Speaking of problems with DEC power supplies...
Some time ago I posted about problems with five 1800uF capacitors in multiple
H7821 power supplies leaking electrolyte, particularly when the machines are
stored in the wrong orientation.
One of my MicroVAX 3100 machines has a slightly different
>
>> -Original Message-
>> From: cctalk On Behalf Of Christian Corti
>> via cctalk
>> Sent: 06 January 2022 10:02
>> To: General Discussion: On-Topic and Off-Topic Posts
>>
>> Subject: Re: Source for replacement caps in H744 regulators
>>
>> On Thu, 6 Jan 2022, r...@jarratt.me.uk
Many years ago, a friend gave me an Overland T490 tape drive which has
some kind of autoloader attached which takes ten tapes. I was told it
came out of a Tandem system. The tapes are square cartridges similar
but different to a DEC TK50. I can't find very much information about
the drive on
>
> I've read that there is circuitry in the expansion base (BA40A?) has
> circuitry . Does anyone know what the circuitry does? Is it required
> for SCSI operation? (I hope not, or I'll have to kludge one up to make
> use of pk2k SCSI boot-roms!)
>
I don't know what circuitry there is or is
Jonathan Stone wrote:
>
> I recently rescued two Microvax-2000s but both have dead RD53s. Does
> anyone have a ROMable image of the Microvax 2000/Vaxstation 2000 boot-PROM
> patches from Wolfgang Moeller at http://ftp.gwdg.de/pub/vms/pk2k/ ? �
> I'm looking to install NetBSD, not VMS and I
Early on, floppy disks on the BBC Micro were 5.25in FM with 10 sectors
per track and 256 bytes per sector. However, BBC Micros are probably not
common where you are and some programming in 6502 assembly or BBC Basic
and a knowledge of the Osbourne filesystem would be required.
I might be
>
> Is there anyone with a VT100 (or any VT1xx, if so please specify which)
> that can make a photo displaying text in reverse video? I'm making a
> detailed simulation of the VT100 hardware, and I'd like to see what, if
> any, effect dot streching has. I searched the "VT100 Technical Manual",
>
Zane Healy wrote:
>
> Sorry Peter, I wasn’t even thinking about that at the time, as Malte had
> reported he was able to read them with DECW$BOOKREADER. Though thinking
> about it again, it’s not a bad idea, as it would let me see exactly what
> I’m seeing.
>
> Any pointers to “FILE”? I’m
Antonio Carlini wrote:
On 18/05/2021 10:17, Peter Coghlan via cctalk wrote:
The content of your posting which I was replying to and the error
message you
quoted suggested to me that your concern was that the bookreader files you are
attempting to read are "corrupt".
I think Zane w
Zane Healy wrote:
> On May 17, 2021, at 2:43 PM, Peter Coghlan via cctalk
> wrote:
>> Zane,
>>
>> How about redirecting DECW$BOOKREADER to display on an X server elsewhere?
>>
>> $ SET DISPLAY /NODE=domain.name /TRANSPORT=TCPIP /CREATE
>> $ MCR DECW$B
Zane Healy wrote:
> On May 17, 2021, at 1:54 PM, Malte Dehling wrote:
>>
>> On Mon, May 17, 2021 at 12:46:31PM -0700, Zane Healy wrote:
On May 16, 2021, at 5:51 AM, Malte Dehling via cctalk
wrote:
I have now generated a contents listing for the CONOLD CDs:
1 - 100 of 248 matches
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