On Thu, Jul 12, 2018 at 3:20 PM, Eric Smith via cctalk
wrote:
> That reminds me of one of my favorite computer trivia questions:
>
> What is the shortest useful CP/M program?
My guess (and I am not a CP/M person) is that it's something
like the 0-length .com file. This will not affect memory when
On Mon, Jul 2, 2018 at 11:09 PM, Evan Koblentz via cctalk
wrote:
> Time to reveal a personal project related to vintage computing and unrelated
> to my role at VCFed.
>
> In the past two years, while getting neck-deep in the historic Lego 9700
> "Technic Control Center" set, I learned that there i
On Fri, Jun 29, 2018 at 9:27 AM, Peter Coghlan via cctalk
wrote:
> On 2018-06-28 at 17:05:32 -0700, Chuck Guzis via cctalk wrote:
>
>>
>> The original standard is very old--it dates form 1960--a very different
>> time; DCE was strictly under the control of the telcos, and I suspect
>> that connect
> It was my understanding from using the 730 that there was limited
> (really limited) microcode
> enough to load the WCS as the tu58 was a serial device (standard tu58)
> and the 730 had to
> unpack and stuff the WCS. You need little to do that but far from even
> PDP11 instruction set.
> The Mic
On Sat, Jun 2, 2018 at 7:45 PM, Warner Losh wrote:
> Given the vagaries of tape, I'm surprised nobody has made a simple TU58
> emulator that can feed the proper microcode bits to the 11/730...
>
> Then again, maybe there's no market for that.
Oh, I think there are. I belive you can use something
On Sat, Jun 2, 2018 at 7:37 PM, Alan Frisbie wrote:
> Tony Duell wrote:
>
>> > until the 8085 CFE loaded the microcode.
>>
>> Loaded from a TU58 cartridge, which is the main reason my 11/730 is not
>> running at the moment. The hardware is fine, I've rebuilt the drive
>> rollers,
>> but as yet do
On Fri, Jun 1, 2018 at 6:08 PM, Robert Armstrong via cctalk
wrote:
>>Eric Smith wrote:
>
>>The control stores of the 11/785, 8600, and 8650 were entirely WCS.
>>
>>All other VAXen had (relatively) large ROM control store and tiny WCS or
>>patch store.
>
> You forgot the 11/730 and 725. The KA7
On Wed, May 30, 2018 at 4:11 PM, Camiel Vanderhoeven via cctalk
wrote:
>> Gotcha. Which small VAXes had external ROM/PALs for microcode store?
>>
>
>
> Depending on your definition of small, the MicroVAX 1, and the VAX 8000 series
> (not that small). In both cases though, the ROM chips are a cust
On Tue, May 22, 2018 at 5:56 PM, Robert via cctalk
wrote:
> My latest score is an HP 9836CU (so, color with a 68010 CPU and HP-UX
> support) with a 98625A disk interface. I got the matching monitor, but
> I didn't get the video cable.
>
> Googling turns up that it's a very proprietary interface, b
On Thu, May 17, 2018 at 8:56 AM, jos via cctalk wrote:
> Subject says it all :
>
> anyone has datasheets for this obscure single chip Philips P800-type
> microprocessor ?
Sorry :-(
The only single-chip P800 I have any information on is numbered 'XSC2752',
and I don't have a data sheet for that.
On Sun, Apr 29, 2018 at 11:29 PM, Maciej W. Rozycki via cctalk
wrote:
> On Sun, 29 Apr 2018, Paul Koning via cctalk wrote:
>
>> So that's the answer: graphite powder. I now have a working analyzer
>> again. It will be interesting to see if the graphite wears off
>> eventually, I suppose it might
On Sat, Apr 28, 2018 at 3:57 PM, Anders Nelson via cctalk
wrote:
> Hey all,
>
> I have an IBM 5140 portable with a printer but I'd really like to use it as
> a terminal among other things. Any chance there's documentation available
> for that Centronics connector or another internal header with RS
On Sat, Mar 24, 2018 at 4:00 AM, Josh Dersch via cctalk
wrote:
> Hi all --
>
> I've got an 11/03 backplane here (designated as an "11/03 EA" originally but
> marked as "Model changed from EA to AA") inside a small chassis w/power
> supply, model "OH780-A." (So it was at some point in its life the
On Tue, Feb 6, 2018 at 5:09 AM, Zane Healy via cctalk
wrote:
> On 2018-02-05 21:07, Zane Healy via cctalk wrote:
> And obviously I meant to ask, is anyone able to get email from this list via
> either gmail or an email account hosted by RackSpace?
I get cctalk via gmail with no problems (AFAIK).
On Mon, Dec 18, 2017 at 8:06 AM, Rob Jarratt via cctalk
wrote:
> I am reverse engineering the schematic for the input stage of my H7862 PSU.
> I have come across a KBU6J bridge rectifier which seems to be connected only
> to the two middle pins, which are the AC inputs. I can't see any other
> con
On Sun, Dec 17, 2017 at 5:04 PM, Aaron Jackson via cctalk
wrote:
> Now that I have my RX02 drive working I have started to take a look at
> the RL02 drives again. I hooked a scope up to the sector transducer and
> sector timing test points, and they look nicely aligned. So I moved on.
>
> Then I h
On Sun, Dec 10, 2017 at 2:06 AM, allison via cctalk
wrote:
Assuming it's the same as the one I worked on some years ago...
>> How does it detect the presence of a disk? and/or disk change?
It's a mechanical switch on the motor PCB. A similar switch detects
the write-protect hole.
>>
>>
> Fu
On Fri, Dec 8, 2017 at 3:03 PM, Aaron Jackson wrote:
>
> Manual says it should be S1=off, S2=on for RX211 and RXV21
In the photo, I think S1 is on and S2 is off. Check them with an
ohmmeter if in doubt!
-tony
On Fri, Dec 8, 2017 at 2:45 PM, Aaron Jackson via cctalk
wrote:
> - Strapped RX01 - I don't know what this means
>
> - PDP8 - eh?
No idea as to the fault (heck, it's not in front of me with a logic analyser
to hand), but I think I can explain that.
There is a pair of DIP switches on the control
On Wed, Dec 6, 2017 at 6:07 PM, Chuck Guzis via cctalk
wrote:
> On 12/03/2017 10:00 AM, Tony Duell wrote:
>
>> That sounds like the original version with the separate logic module.
>>
>> I think the display is the same between the 2 versions. I am also
>> pretty sure the same display is used in al
On Sun, Dec 3, 2017 at 4:39 AM, Chuck Guzis via cctalk
wrote:
> On 12/02/2017 05:18 PM, Paul Berger via cctalk wrote:
>> A good source of replacement displays is from 12C of the same vintage,
>> there was lots of them produced and they can often be obtained for a
>> reasonable cost. If you you lo
On Sun, Nov 26, 2017 at 3:02 PM, Adrian Graham via cctalk
wrote:
>> What happens if C101 is removed? Also try running it with TR101
>> removed (or at least the emitter lead of that transistor disconnected).
>
> Nothing happens, in that the picture is the same as it is with both those
> component
On Sun, Nov 26, 2017 at 12:32 PM, Philip Pemberton
wrote:
> On 26/11/17 06:17, Tony Duell wrote:
>>> Also - does anyone know what the material on the printhead capping
>>> station is, or if they're still available?
>>> It looks like a cardboard or blotting paper pad with a plastic backing
>>> card
> Also - does anyone know what the material on the printhead capping
> station is, or if they're still available?
> It looks like a cardboard or blotting paper pad with a plastic backing
> card. This one is soaked in ink and looks like it could do with being
> replaced. I assume it's to stop the ca
On Sat, Nov 25, 2017 at 11:02 PM, Adrian Graham via cctalk
wrote:
> Evening!
>
>> OK... Firstly, measure the voltage on pin 8 of the monitor PCB. Can you get
>> it to swing from 0 to around 12V?
>
> Yes, it tops out at 11.82V.
Can you get it down to 0V?
>
>> Scope the video output from the CPU b
On Fri, Nov 24, 2017 at 8:41 AM, Brent Hilpert via cctalk
wrote:
> On 2017-Nov-23, at 5:07 PM, Adrian Graham via cctalk wrote:
>>> On 23 Nov 2017, at 21:18, Brent Hilpert via cctalk
>>> wrote:
>>> ...
>>> You might check the contrast control.
>>> I can't find the actual schematic for the contras
On Wed, Nov 8, 2017 at 7:05 AM, Josh Dersch wrote:
> On 11/6/2017 8:59 PM, Tony Duell wrote:
>
> What BOOTROM version do you have in your machine? I have 4.0, I'm curious
> if there's a later version.
Mine is 4.0
-tony
On Tue, Nov 7, 2017 at 3:47 PM, Ethan Dicks via cctalk
wrote:
> Yes. An 8/e/f/m bezel and panel should fit. It shouldn't be horribly
> hard to find a bare Omnibus backplane block. The original PSU might
> be a bit tougher, but except for classic purity, there's nothing
> wrong with coming up
On Tue, Nov 7, 2017 at 6:39 AM, Eric Smith wrote:
> On Mon, Nov 6, 2017 at 9:59 PM, Tony Duell via cctalk
> wrote:
>>
>> Mine identifies the CPU as a 68010 in the power-on diagnostic. But from
>> what
>> I remember the PGA socket could also take a 68012 (with ext
On Tue, Nov 7, 2017 at 4:52 AM, Josh Dersch via cctalk
wrote:
> I'm curious if other people out there with 9836U's can confirm whether their
> machine has a 68000 or a 68010 in it, I'd just like to settle the internet
> discrepancy once and for all :).
Mine identifies the CPU as a 68010 in the p
On Sun, Nov 5, 2017 at 5:43 PM, Aaron Jackson via cctalk
wrote:
> Hi everyone,
>
> I have managed to hook up an RL02 drive to my PDP-11 (thanks to Dave
> Wade for the drives) . This took me longer than I thought it would - I
> tried with a flat ribbon cable with a DIY terminator going straight int
On Sun, Oct 29, 2017 at 6:51 PM, Chuck Guzis via cctalk
wrote:
> On 10/29/2017 11:44 AM, emanuel stiebler via cctalk wrote:
>> Anybody looking for one?
>> Free for pickup, 80433 colorado
>
> That's a 150VDC (octal base) voltage regulator tube?
That was my first thought too (the good old OD3)
On Sun, Oct 29, 2017 at 8:08 PM, Tomasz Rola via cctalk
wrote:
> - no moving parts
> - keeps working on zero volts with no problem
> - no proprietary unrepairable circuits
> - no worry that rohs-no-lead solder breaks
> - no manual required
> - repairs can be done anywhere, cheaply
> - expansion c
On Sat, Oct 14, 2017 at 5:05 AM, Ethan Dicks via cctalk
wrote:
> Hi, All,
>
> I have some Hitachi parts, marked 21-18470-01, that I pulled from a
> DEC Professional 350 on an upgrade to 256Kx1 DRAMs. I am trying to
> track down a specific thing about them. I found a vcfed.org post
> about these
On Sat, Oct 7, 2017 at 9:31 PM, Jerry Weiss via cctalk
wrote:
>
>> On Oct 7, 2017, at 12:55 PM, jos via cctalk wrote:
>>
>>
>> Looks like another computer will be joining the stable shortly, containing a
>> Diablo 31 drive.
>>
>> From the manual it looks that it does not need heads to be locked
On Sun, Oct 1, 2017 at 6:09 PM, js--- via cctalk wrote:
>
>
> On 10/1/2017 12:02 PM, Tony Duell via cctalk wrote:
>>
>> On Sun, Oct 1, 2017 at 5:18 PM, js--- via cctalk
>> wrote:
>>>
>>> You need a 25khz monitor. Here's a list I've comp
On Sun, Oct 1, 2017 at 5:18 PM, js--- via cctalk wrote:
>
> You need a 25khz monitor. Here's a list I've compiled over the years.
>
> 25khz 640x400 SOG monitors
>
> HP 98204A (used with 82913A 12" 640x240 and 82912A 9" 640x240 monitors)
Are you sure about that one? The HP98204A that I have give
On Sun, Oct 1, 2017 at 8:24 AM, devin davison via cctalk
wrote:
> I found another HP machine at the scrapyard today. I have another
> similar model that boots up to HP basic. I do not see an exact model
> number anywhere on it, all i see is Hp 9000/300 on the front. It
> appears similar to the oth
On Sat, Sep 30, 2017 at 6:32 AM, Chuck Guzis via cctalk
wrote:
> Still a few too many read errors for my taste, so this weekend is going
> to be a session with a 'scope and alignment tape. I think I've got a
> way to adjust skew--just hook a logic analyzer probe to each channel and
> set the LA
On Mon, Aug 28, 2017 at 7:30 PM, Rob Jarratt
wrote:
> So do I, but I fear they are going to be really difficult to remove. They are
> both epoxied
> in two places, in both cases one of the glue dabs is pretty inaccessible. I
> am minded
Are you sure it's epoxy? Every time I've had components g
On Mon, Aug 28, 2017 at 5:52 PM, Rob Jarratt
wrote:
> I have posted some information along with a rough schematic here:
> https://rjarratt.wordpress.com/2017/08/28/decstation-5000-model-240-h7878-possible-fault-found/.
> Other information is in the previous post:
> https://robs-old-computers.com
On Mon, Aug 28, 2017 at 12:49 PM, Rob Jarratt via cctalk
wrote:
> My recently acquired DECstation 5000/240 has had a PSU failure. After
> replacing a couple of small capacitors with high ESR, I have been doing some
> basic checks to see which stages are working. My first step has been to
> check t
On Sat, Aug 26, 2017 at 7:09 PM, Rob Jarratt
wrote:
>
>> -Original Message-
>> From: Tony Duell [mailto:ard.p850...@gmail.com]
>> Sent: 26 August 2017 18:39
>> To: r...@jarratt.me.uk; Rob Jarratt ; General
>> Discussion: On-Topic and Off-Topic Posts
>> Subject: Re: DECstation 220. Another
On Sat, Aug 26, 2017 at 5:57 PM, Rob Jarratt via cctalk
wrote:
>
> I have replaced several parts in the area of the monitor sense circuit,
> including the comparator and the buffer it is driving, but the comparator
> does not seem to be doing what you would expect. I have reverse engineered
> the
Was somebody here looking for information on the Subject: line a while
back? It's an IEEE-488 to RS232 interface, often used with the Commodore
PET.
I have come across and scanned the user manual for it. There's not much
technical information in there, but it does give the DIP switch settings and
>
> Late last year I picked up a Sony PVM-9041QM 9” ex-broadcast monitor
> for not much money at all, it sits nicely on top of an Apple ][ and looks
> excellent with a pair of Disk][s stacked next to it. There MUST be TV
> studios around your area pretty much throwing these out these days.
You hav
On Wed, Aug 23, 2017 at 12:23 AM, Mark J. Blair via cctalk
wrote:
> Now, you say you want a color monitor. I think that similar color CCTV
> monitors
> are even more commonly available. I haven't been paying close attention to
> them
> since I've been looking for a specific monochrome monitor,
On Sat, Aug 19, 2017 at 6:14 PM, Rob Jarratt via cctalk
wrote:
> For the time being I have decided to take a look at the other spare board,
> which works less well in that it does not produce any kind of video output
> at all, but on the basis that the 82C206 seems to be OK, it might be easier
>
On Thu, Aug 17, 2017 at 4:55 AM, Terry Stewart via cctalk
wrote:
> The monitor is a Personal System/2 Monochrome display. Model 8503. It’s VGA
> but mono.
>
> I found one manual on the web. It’s the “IBM Personal System/2 Display
> Hardware Maintenance Manual - Vol. 1” January 1993. Document Numb
On Wed, Aug 16, 2017 at 7:10 PM, Rob Jarratt via cctalk
wrote:
> I suppose that, happily, it looks possible to procure replacements for this
> chip. I am slightly puzzled by the packaging of this chip though. It is
> surface mounted on my CPU board, but the packages available for this chip
> are
On Wed, Aug 16, 2017 at 7:12 PM, Chuck Guzis via cctalk
wrote:
> On 08/16/2017 10:40 AM, Tony Duell via cctalk wrote:
>
>>
>> I have just looked at it, and unfortunately it is of no help with this
>> question (I assume that if manuals for other versions of the FD235
>&g
On Wed, Aug 16, 2017 at 6:28 PM, Al Kossow via cctalk
wrote:
> I was looking at this thread
> https://forum.kryoflux.com/viewtopic.php?f=3&t=749
>
> And they mention the data they were looking at has AGC applied.
>
> I didn't know any floppies used AGC in their read channel and in particular
> I'm
On Mon, Jul 31, 2017 at 4:30 PM, Jay Jaeger via cctech
wrote:
> I did see one reference online from the December 1994 DECUServe Journal
> to the batteries being "in a clip holder under the center column of the
> drive". One might take that to mean in the center area between the
> logic card cage
On Sun, Jul 30, 2017 at 8:17 PM, Jules Richardson via cctalk
wrote:
> On 07/30/2017 11:28 AM, Tony Duell wrote:
>>
>> I certainly traced out the schematics of mine, but I forget which PSU was
>> fitted to my machine (something tells me it was made by Farnell).
>
>
> That could well be - I do thin
On Sun, Jul 30, 2017 at 8:17 PM, Jules Richardson via cctalk
wrote:
>> The former are the ones that normally fail, but I would change the lot.
>
>
> I'd be inclined to agree in the case of any class X/Y caps as they're a
> known failure point in any piece of vintage equipment... but not every
> s
On Sun, Jul 30, 2017 at 5:18 PM, Jules Richardson via cctalk
wrote:
> On 07/30/2017 10:59 AM, Ian Frost via cctalk wrote:
>>
>> Any body any experience in fixing these old Acorn PSUs - or managed to
>> source alternative modern supplies?
In general smoke from a power supply that keeps on working
On Mon, Jul 24, 2017 at 6:12 AM, Fritz Mueller via cctalk
wrote:
> "OMG, are you nuts, don't take the heads out, you'll never get them
> aligned,"
>
> or is it:
>
> "Meh, RK05 alignment is not really that tough, and you would be better off
> making sure your heads are thoroughly clean and i
On Fri, Jul 21, 2017 at 7:30 PM, Chuck Guzis via cctalk
wrote:
> Even before flexible magnetic disks were used to record digital
> information, they found use in audio equipment. E.g. the Telefunken DT-600:
>
> http://vintage-technics.ru/Eng-Telefunken_600.htm
Off-topic, but I have the desktop
On Mon, Jul 17, 2017 at 7:56 PM, shad via cctalk
wrote:
> Hello Tony,
> I read you have an R80 for 730.
> I have such machine, unfortunately the 80 is broken, I suppose the HDA is
> gone.
> The belt is also almost gone.
> That's why I would really like to find replacements.
Alas the belt is o
On Mon, Jul 17, 2017 at 1:39 PM, Greg Griffith via cctalk
wrote:
> Hi Everyone,
>
> I recently ended up with a DEC RA80 that I'd like to try to get running.
> Unfortunately, it seems someone removed it's servo card along the way.
>
> I was looking to see if anyone had one that they were looking to
On Sun, Jul 2, 2017 at 7:03 AM, Chuck Guzis via cctalk
wrote:
> On 07/01/2017 10:27 PM, Tony Duell via cctalk wrote:
>
>> I was told years ago that in general the thinner-wall sockets are better
>> quality -- they have to be made from stronger steel alloy to work at
>>
On Sun, Jul 2, 2017 at 12:09 AM, Jules Richardson via cctalk
wrote:
> Anyway, I picked up a cheap 7/32" deep socket from Menards ($3 or so) - and
> as it happens, it Just Works without modification. It's not marketed as
> thin-walled; I expect they just made it cheap by leaving out a bunch of
> m
On Sat, Jul 1, 2017 at 8:12 PM, Adam Sampson via cctalk
wrote:
> Jules Richardson via cctalk writes:
>
>> Google suggests that they might be 7/32", but I'm not sure; that's
>> less of a common size (vs. 3/16" or 1/4", say) - I'm not even sure I
>> could find a driver like that around here.
>
> Ye
On Wed, Jun 28, 2017 at 2:04 AM, Warner Losh via cctalk
wrote:
> Had a static discharge event with my VR-201 and suddenly the background is
> 'grey' rather than 'black'. By this I mean I see maybe 50% of the color
> (where before I saw maybe 1%) and maybe half a dozen solid diagonal lines.
> This
On Fri, Jun 16, 2017 at 6:20 PM, Rob Jarratt
wrote:
>
>> I have therefore come to the conclusion that people don't want my scans (for
>> whatever reason). And I am not going to waste my time scanning manuals as a
>> result. So no Philips P800 schematics, etc.
>>
>
>
> I would suggest that it is no
On Fri, Jun 16, 2017 at 3:17 PM, Alan Perry via cctalk
wrote:
>
>
>> On Jun 15, 2017, at 23:11, Lyle Bickley via cctech
>> wrote:
>>
>>
>>
>> Having volunteered with Collections (cataloging, etc.), I know that one
>> session at VCF would be insufficient to qualify someone to properly
>> handle a
On Sun, May 28, 2017 at 5:22 PM, Mattis Lind via cctalk
wrote:
> Can someone tell me what kind of connector this is:
>
> http://i.imgur.com/ZvLLQSO.jpg?1
>
> A source for a mating male connector is appreciated!
EDAC 516 series. Still made, and available from companies like RS components.
Be warne
On Sun, May 28, 2017 at 4:50 PM, Mattis Lind via cctalk
wrote:
> Hello!
>
> I recently received a HP9816 machine. The previous owner originally got the
> machine without a keyboard but subsequently sourced a keyboard off ebay.
>
> Unfortunately this keyboard was not in the best shape. One key was
On Fri, May 26, 2017 at 8:45 PM, Bob Rosenbloom via cctalk
wrote:
> Spring cleaning time!
>
> I have three vintage HP 9836 computers, two monochrome monitors, one color
> monitor and three printers.
> I'm sure they are going to need work to get running. No testing has been
> done. Could probably g
On Sun, May 21, 2017 at 3:08 AM, allison via cctalk
wrote:
> The only boards with T11 I have are RQDX1/2/3. However I have a few
> T11s that were ES parts from
As an aside, there's a T11 in the VT240 terminal. I am certainly not suggesting
raiding such a terminal for the T11 chip though.
I alw
On Wed, May 10, 2017 at 6:22 PM, Shoppa, Tim via cctalk
wrote:
> I usually also found a useful current loop supply in the base. Sometimes I
> would find
> bipolar relays and 20mA/60mA conversion supplies. I was a little surprised at
> some
> of the current loop supplies - some of them weighed 2
On Sat, Apr 29, 2017 at 7:36 PM, Aaron Jackson via cctalk
wrote:
>> Since it doesn't smoke, I'm thinking the horizontal sweep
>> transistor may have gone out. It may have shorted, which
>> then may have burned up the primary winding in the flyback
>> (if left on long enough). I'd check that tran
On Sat, Apr 29, 2017 at 5:45 PM, Aaron Jackson wrote:
> I have measured these again because I thought they seemed a bit
> strange. I must have probed the wrong pad on the circuit board earlier
> (my probes don't fit in the CRT header).
>
> Here are all the voltages and they don't seem too promisin
On Sat, Apr 29, 2017 at 4:44 PM, Aaron Jackson wrote:
> Unfortunately I do not have an oscilloscope anymore. I've been trying to
> find a cheap one on eBay for a few months but the prices seem very high
> these days. I might be able to borrow one. For now I just have a true
> RMS multimeter.
>
> I
On Sat, Apr 29, 2017 at 4:19 PM, Aaron Jackson wrote:
> Seems to be working fine as a terminal hooked up to the TV which is good
> news. I am sure you are correct about me having made a measurement error
> there...
So the logic side is working. The problem is very likely to be in the
monitor circ
On Sat, Apr 29, 2017 at 2:34 PM, Aaron Jackson wrote:
> The heater and control pins appear to be giving sensible voltages. The
> logic of the board is fine, I can type on the terminals keyboard and I
> get the correct characters on the other end of the serial cable. The PSU
> is putting out 31v wh
On Fri, Apr 28, 2017 at 5:10 PM, dwight via cctalk
wrote:
> I'll have to give mine a look. I hate that foam.
There seem to be 2 types. One turns to a sticky goo, the other turns to
dust. I refer to them both as 'Evil Foam'. I have just removed some from
the drives of an RX01 (the older drives, on
On Fri, Apr 28, 2017 at 4:38 PM, Aaron Jackson via cctalk
wrote:
> Yes we checked for the glow. It's very dim but it is there. I will bring
What do you mean by 'very dim'? It should be a distinct orange glow,
best seen looking
up the base of the CRT.
I normally start by checking the CRT pin volt
On Thu, Apr 27, 2017 at 6:42 PM, Ethan Dicks via cctalk
wrote:
> Hi, All,
>
> I'm cleaning/refurbing a TRS-80 Model 4 I picked up at VCFe that was
> in dirty-but-mostly-working shape. I've completely dismantled,
> cleaned and reassembled the keyboard, I fixed the bad cable to the
> floppy control
On Mon, Apr 24, 2017 at 4:03 PM, Rick Bensene via cctalk
wrote:
> Tony D. wrote:
>
>> Are any DEC enthusiasts here jealous of this :
>>https://www.flickr.com/photos/tony_duell/33427116663/in/dateposted-public/
>
> Interesting coincidence. I was digging through some boxes of stuff
> yesterday, a
On Mon, Apr 24, 2017 at 3:34 PM, Ethan Dicks wrote:
> On Mon, Apr 24, 2017 at 5:35 AM, Tony Duell via cctalk
> wrote:
>> Are any DEC enthusiasts here jealous of this :
>>
>> https://www.flickr.com/photos/tony_duell/33427116663/in/dateposted-public/
>
> Yes. I hav
On Mon, Apr 24, 2017 at 10:42 AM, Pontus Pihlgren wrote:
> On Mon, Apr 24, 2017 at 10:35:13AM +0100, Tony Duell via cctalk wrote:
>> Are any DEC enthusiasts here jealous of this :
>>
>> https://www.flickr.com/photos/tony_duell/33427116663/in/dateposted-public/
>>
&g
Are any DEC enthusiasts here jealous of this :
https://www.flickr.com/photos/tony_duell/33427116663/in/dateposted-public/
-tony
On Sat, Apr 22, 2017 at 2:20 AM, Fred Cisin via cctalk
wrote:
> Some words in English, such as "large" are just too subjective.
The one I object to, particularly in book titles is 'modern'. I have a wonderful
set of books entitled 'Modern Electrical Engineering' with no obvious date.
Wonderful i
On Fri, Apr 21, 2017 at 6:24 PM, Rob Jarratt
wrote:
>
>
>> > My back of the envelope calculation comes to approximately
>> > 4 million miles of paper tape.
>>
>> I think you're out by a factor of 10 267*10^9 bytes, divide by 10 as
>> there are
>> 10 bytes to the inch on paper tape, and conver
On Fri, Apr 21, 2017 at 5:36 PM, Thomas Kula via cctalk
wrote:
> To be fair, while we may have missed the 020th and 20th anniversaries,
> we're well ahead of the 0x20th anniversary.
>
> So --- what base are we using?
Or what about celebrating 8192 days of the list, which I think
is a little over
On Fri, Apr 21, 2017 at 3:42 PM, Pontus Pihlgren via cctalk
wrote:
> On Fri, Apr 21, 2017 at 09:34:52AM -0500, Jay West via cctalk wrote:
>>
>> But that being said... we should have had a party or something *grin*.
>>
>
> You could argue that years are index starting from zero. Thus the
> 20-year
On Thu, Apr 20, 2017 at 8:27 PM, Rob Jarratt
wrote:
>
>
>> > The bitsavers archive is 267 Gbytes.
>> >
>> > So at 4.7G per DVD, it comes out to almost 60 DVD's.
>>
>> That is not totally ridiculous
>>
>> Now, if I want bitsavers on paper tape
>>
>> >
>
> My back of the envelope calculation
On Thu, Apr 20, 2017 at 6:49 PM, Shoppa, Tim via cctalk
wrote:
> Ben asks:
>> Just how big is the server?
>> As a wish list, I've always wanted that as a offline set of DVD's for the
>> common stuff.
>
> The bitsavers archive is 267 Gbytes.
>
> So at 4.7G per DVD, it comes out to almost 60 DVD's.
On Wed, Apr 12, 2017 at 8:15 PM, Fred Cisin via cctalk
wrote:
of which I don't know. It is a 40 pin to 50 pin ribbon cable with a
black box connecting them that is labeled TANDY. I know of nothing
the Tandy made that used a 50 pin connector other than a hard disk.
>
> On Wed, 12 A
On Wed, Apr 12, 2017 at 3:51 PM, Bill Gunshannon via cctalk
wrote:
>
> So, I just picked up an MISE from Bartlett Labs (cause I really liked
> the M3SE I had) and decided to revive one of my TRS-80 MOdel I's.
> In my box of "stuff" I found an interesting ribbon cable the function
> of which I don'
On Thu, Mar 30, 2017 at 9:13 PM, Noel Chiappa via cctalk
wrote:
> I'm still not clear, from the discussion, how exactly that nice 'square-wave'
> interference is happening - could it be capacitative crosstalk? (I'd have
> thought capacitative cross-talk would be inverted - driving a positive volta
On Wed, Mar 29, 2017 at 6:01 PM, Chuck Guzis via cctalk
wrote:
> Or the time an English co-worker related the story surrounding her
> initial job interval in the US. She described the stunned look on the
> face of the desk clerk at the local Holiday Inn when she asked to be
> knocked up at 7:30
On Mon, Mar 13, 2017 at 8:45 PM, Marc Howard via cctech
wrote:
> Hi,
>
> The "2" key on my VT52 is very hard to use. You've gotta pound it and you
> might get 2 "2"s for your trouble.
>
> I assume that the keyboard switch is made of unobtanium (If you know of a
> substitute chime in) so I'm think
On Fri, Mar 10, 2017 at 5:15 PM, Jay West via cctalk
wrote:
> Local electronics place has a HP 9815A for sale, the appearance from a 10
> foot distance was "fair" or slightly less than fair condition. If someone is
> serious about it, let me know and I'll inquire further.
>
No I don't want to try
On Fri, Mar 3, 2017 at 6:26 AM, Josh Dersch wrote:
> Cool. I managed to snag an M8217+M9403 so all I need to do is track
> down/build some cabling to tie the two together (any idea what the max
Officially it's just a pair of standard DEC 40 way ribbon cables.
> length of these cables is?). I
On Wed, Mar 1, 2017 at 7:39 PM, Chuck Guzis via cctalk
wrote:
> On 03/01/2017 11:14 AM, Charles Anthony via cctalk wrote:
>> Part of the iconic mainframe experience is the cold room sounds; for early
>> Multics installations (and other systems) the sound of the Selectric
>> operator's console.
>
>
On Tue, Feb 28, 2017 at 4:21 PM, allison via cctalk
wrote:
>
> The tape recorders used had no agc. They were simple portables and used the
> mic or line input and headphone output.
I have to disagree with you there. I have just looked at the documentation for a
couple of the Radio Shack tape r
On Tue, Feb 28, 2017 at 6:10 PM, Jim Brain wrote:
> A digital one. The current goal is to feed the incoming data stream into an
> Atmel AVR running at 5V for parsing. The final goal is to do the same, but
> run the AVR at 3V on two coin cells.
OK. I assume you don't want to be running special
On Tue, Feb 28, 2017 at 5:12 PM, Tapley, Mark via cctalk
wrote:
> On Feb 28, 2017, at 9:55 AM, Jim Brain via cctalk
> wrote:
>
>> Analog, which is my nemesis, curses me again.
I fail to see how anyone can be a good digital designer and not
understand analogue
electronics.
>>
>> I have a cute i
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