On Fri, May 22, 2020 at 6:21 PM Fred Cisin via cctalk
wrote:
>
> On Fri, 22 May 2020, Tony Duell wrote:
> > Of course plugging an RS232 cable (DB25, none of this DE9 nonsense!)
> > into a PC printer port (or a PC printer cable into an RS232 port) is a
> > good way to let
> But, I have some 3.25" drives that use same connectors as "standard" 3.5"
> drives, ("4 pin Berg"?) EXCEPT 5V and 12V are swapped in their positions
> in the coneectors!
I have an Archive Sidewinder tape drive on one of my PERQs. The power
connector is the same as a 5.25" floppy drive power
On Sat, May 9, 2020 at 5:59 PM Brian L. Stuart wrote:
> If it's the one I'm thinking of, the game is called hexapawn,
> though it's played on a 3x3 grid, like TTT. I've always
> had a fond spot for that article. It was one of my inspirations
> back when I did a lot of AI.
I remember Martin
On Sat, May 9, 2020 at 4:23 PM Noel Chiappa via cctalk
wrote:
>
> > From: Dwight Kelvey
>
> > There was a fellow that made a relay logic that could play tic tac toe
>
> What's with these new-fangled devices using _electricity_ anyway? :-)
>
> In high school, my math teacher (I think it
On Sat, May 9, 2020 at 1:07 PM Stefan Skoglund wrote:
>
> tor 2020-04-30 klockan 13:49 +0100 skrev Tony Duell via cctalk:
> > From time to time there are posts here about the Facit N4000 paper
> > tape punch/reader unit. The one that looks like a Facit 4070 with a
> >
On Fri, May 1, 2020 at 6:20 PM Hugh Pyle wrote:
>
> Tony, maybe your collection can help me answer a puzzle: which side is
> "top"? By my reading, for 8-level tape,
> - ANSI and other US standards have three data bits / index / then five data
> bits
> - ECMA has five/index/three... :)
>
On Fri, May 1, 2020 at 4:48 PM Anders Nelson via cctalk
wrote:
>
> Wow, what a response! Really appreciate the docs and first-hand experience,
> this is super helpful.
I feel very greedy now. Looking arounds I have (not all working, but
all could be got to work, it's things like drive belts I
>
> > Be warned that making any paper tape punch is going to be non-trivial.
> > Grinding and hardening the punch pins and making the die block for
> > them to run in is quite a difficult machining task. And that's needed
> > what ever drives them.
>
> True. At least the pins may be something you
On Fri, May 1, 2020 at 4:32 PM John Foust via cctalk
wrote:
> Were there any paper tape devices that did not use the sprocket holes
> to move the tape?
Yes, both punches and readers.
The Facit 4070 (and the N4000) punch uses a capstan and pinch roller
to move the tape. It's driven by a stepper
On Fri, May 1, 2020 at 5:02 AM Anders Nelson via cctalk
wrote:
>
> Hi all,
>
> I've had a paper tape reader for a while but never had a punch to make new
> tapes, and the ones i've found are not only very large but also very
> expensive. So I'm toying with the idea of making an open-source punch,
On Fri, May 1, 2020 at 2:18 AM Al Kossow via cctalk
wrote:
>
> On 4/30/20 2:55 PM, Josh Dersch wrote:
>
> > It is, I refoamed mine for VCFPNW last year. I can take internal pictures
> > if it'd help anyone out.
> >
> > - Josh
> >
>
> can you dump the firmware? or was that already done for the
>From time to time there are posts here about the Facit N4000 paper
tape punch/reader unit. The one that looks like a Facit 4070 with a
tape reader on the front (in fact the punch mechanism is much the same
as that in the 4070).
I have reverse-engineered mine and traced out the schematics. Of
On Thu, Apr 30, 2020 at 6:40 AM Tony Duell wrote:
>
> > Thanks in advance for any leads or on-topic discussion of the keyboard
> > protocol to tide me over in the meantime...
>
> I'll see what I can find, I am sure I have some notes on it somewhere.
Digging around, I have
> Thanks in advance for any leads or on-topic discussion of the keyboard
> protocol to tide me over in the meantime...
I'll see what I can find, I am sure I have some notes on it somewhere.
>From what I remember, the keyboard interface is 8 bits + a strobe
line. Bottom 7 bits are essentially
On Tue, Apr 28, 2020 at 10:34 PM David Collins via cctech
wrote:
>
> Further to Dave’s post below, I’m happy to share the Arduino code and
> schematic if anyone has a suitable reader and wants to try it. It was indeed
> designed to interface to the HP2748 but is pretty simple and could be
On Tue, Apr 28, 2020 at 5:01 PM Bill Degnan via cctech
wrote:
>
> Hi - COVID project I have been attempting to read some old Honeywell
> DDP-516 papertapes using the OP-80A or Teletype reader but it's inefficient
> and I don't want to damage the tapes. Does anyone have a reliable
> papertape
On Mon, Apr 27, 2020 at 11:11 PM Fred Cisin via cctalk
wrote:
>
> On Mon, 27 Apr 2020, Tony Duell wrote:
> > Of course toner cartridges for these printers are getting almost
> > impossible to find now. And I don't think any later Laserjets had a
> > 'VDO' interface op
[Canon CX printer]
>
> But, I didn't know that there was a popular Perq interface.
It's hardly 'popular' (or common). Any PERQ OIO card is rare. It's
just that the most common one (in fact AFAIK the only one from 3
Rivers) has the option of the Canon CX printer interface. Note that if
you find a
On Mon, Apr 27, 2020 at 3:54 AM Fred Cisin via cctalk
wrote:
>
> Eliminating one of the LEAST important:
>
> Picture 267 is a Corona Data Systems (later Cordata) laser printer. It's
> an ordinary Canon CX engine (Same as HP LaserJet and LaserJet-Plus (which
> had a large rasterizing board in
On Mon, Apr 27, 2020 at 12:33 AM Chris Zach via cctalk
wrote:
>
> I also picked up a pile of Perq boards, and all the DC600 tapes and
> floppies I could take out. The car was loaded with them, someone is
> going to have to curate these. But since I know that the most important
> thing is the
On Sat, Apr 25, 2020 at 11:29 PM Rob Jarratt via cctalk
wrote:
>
> Always wanted a Perq since using one in the 80s when I worked briefly at ICL.
> Guess this is all in the USA though.
You're making me feel very greedy, as I have 4 of them. All different,
and none for sale...
>
> Regards
>
>
On Sat, Apr 25, 2020 at 4:28 PM Chris Zach via cctalk
wrote:
>
> Hi!
>
> Does anyone here remember Bob Davis?
The PERQ-fanatic?
I never met him, but I had many enjoyable e-mail conversations with him
-tony
On Thu, Apr 23, 2020 at 1:57 PM emanuel stiebler wrote:
>
> On 2020-04-23 03:45, Tony Duell wrote:
>
> > Remember them? I have one. A rackmount box (quite tall, possible 12U
> > or more) with 2 PSUs at the bottom and mostly wire-wrapped boards in
> > the top part. Link
On Wed, Apr 22, 2020 at 10:31 PM emanuel stiebler via cctalk
wrote:
>
> Hi all,
> was just fishing in old memories & graphics systems. We had in the
> 1980's a big fridge from Grinnell Systems as a frame buffer on a 11/34.
>
> Anybody remember those? Links to any documentation?
Remember them? I
On Mon, Apr 6, 2020 at 4:40 AM Doug Jackson via cctalk
wrote:
>
> for me, the item that usually fails in the WTCP series is the switch at the
> end of the sensor.
>
> I have replaced the sensors each time, because dammit - My 40 year old iron
> sometimes just needs a new cord, or a new heater, or
On Tue, Feb 25, 2020 at 4:20 PM Alan Perry via cctalk
wrote:
>
>
> As previously discussed here, I have a Sun 3/260 that connects to a Sun
> external storage subsystem containing two 8” SMD drives. The external cabling
> is a 0.7m D-sub 25-pin (male both ends) data cable for each drive and a
>
On Sun, Nov 17, 2019 at 9:18 AM Paul Anderson via cctalk
wrote:
>
> The DEC ones
> can sometimes be converted to RX02s. I think the older (RX01 only) were the
> M7726 and M7727.
> The newer RX02 boards, M7744 and M7745, can be used for either.
> DISCLAIMER!! I'm taking
> the board numbers off the
On Wed, Nov 6, 2019 at 6:00 AM rescue via cctalk wrote:
>
> Well, it is something with the supplies. I tried the floppy power
> supply in place of the system one, and got a Cass? prompt !
> Then I switched back, and got a Cass? prompt ! G ! I'm still
> digging maybe something failed
On Sat, Oct 26, 2019 at 6:53 PM nico de jong via cctalk
wrote:
> In order to test things, I've developped a simulator and assembler for
> the P857, although without floating point and I/O processor, as I have
> no documentation for that, so maybe I can harvest something from the
> documents you
On Sat, Oct 26, 2019 at 6:36 PM nico de jong via cctalk
wrote:
>
> Hi all,
>
> Back in the 70's and 80's Philips had a quite popular series of mini
> computers called P800, which also branched out to the PTS series and
> possibly other.
>
> Could I be lucky to find other list members interested
> Theinfrared array you're thinking of was invented at PLATO, for flat panel
> (plasma) displays. They don't work for CRTs because of the convex screen.
My HP150 will have to disagree with you there.
-tony
On Wed, Sep 25, 2019 at 3:12 PM Noel Chiappa via cctalk
wrote:
> > What is missing, however, is an engineering manual with the schematics.
>
> Well, the M7820's will be the same as in the DH11. The M7285 and M7279 are
> DJ11-specific, though.
>
> I was going to say that 'does anyone even
On Tue, Sep 24, 2019 at 9:15 AM Tony Duell wrote:
>
> On Tue, Sep 24, 2019 at 9:13 AM Bill Degnan via cctalk
> wrote:
> >
> > > >
> > > >
> > > > Here's the full board, for reference:
> > > >
> > > > http://yahozna
On Tue, Sep 24, 2019 at 9:13 AM Bill Degnan via cctalk
wrote:
>
> > >
> > >
> > > Here's the full board, for reference:
> > >
> > > http://yahozna.dyndns.org/scratch/random/board1.jpeg
> > >
> > > Thanks,
> > > Josh
> > >
> >
> > /Mattis
> >
>
> You confirmed it is not Omnibus bd, like a drive
On Mon, Sep 2, 2019 at 5:35 PM Alan Perry via cctech
wrote:
>
>
> Can anyone here provide a pointer to info on testing vintage power
> supplies? Search results on the web may eventually lead to the kind of
> info that I am looking for, but I have to get through too many pages of
> modern PC power
On Wed, Aug 28, 2019 at 6:07 PM Marvin Johnston via cctalk
wrote:
>
> While getting ready to order some Kemet caps from Digi-key (same P/N
> posted earlier), I noticed they all had "RIFA" on them. Is this a big
> OOPS to order them, or would they be okay?
>
> I tend to prefer fixing something
On Wed, Aug 28, 2019 at 5:06 PM Ethan O'Toole via cctalk
wrote:
>
>
> We were at this HOPE conference in NYC. We were helping with it in those
> days, so we had some equipment at the ops area. A whole bunch of commotion
> went down in the OPS area, including someone grabbing a fire extingisher
>
On Sat, Aug 17, 2019 at 4:38 PM Noel Chiappa via cctalk
wrote:
>
> > From: Charles Morris
>
> > Is there any standard pinout for 20 ma current loop using a DB-25
> > connector, analogous to the well-documents RS-232 serial interface?
> > ...
> > Or would you recommend I use a
On Fri, Jul 26, 2019 at 12:23 PM Jules Richardson via cctalk
wrote:
>
>
> Hi all,
>
> Someone on one of the Facebook vintage groups found an IBM 5160 with an MDA
> display for sale in Australia, except that it's a bit odd in that the
> machine had what appears to be an MDA card, the output of
On Mon, Jul 22, 2019 at 8:23 AM Christian Corti via cctalk
wrote:
>
> On Sun, 21 Jul 2019, Guy Dunphy wrote:
> > http://www.bitsavers.org/bitkeepers is something else.
> > The site's contact email is right down the bottom of the front page.
> > Visual, to stop spambots.
> > Also Al posts
On Mon, Jul 22, 2019 at 5:21 AM ED SHARPE wrote:
>
> Great to know Tony! Yea the battery is dead indeed! Will the wallwart
> power it even though the battery is dead? Wish I could remember where
> I put the wall warts... missing are the one for a 16 line portable, a
>
On Sun, Jul 21, 2019 at 7:02 PM ED SHARPE via cctalk
wrote:
>
> thanks for pointing this handy manual out just got one of these in alas
> with out the wall wart to charge it... and the 16 line screen version
> has is in a display but its wall ward is stored
On Tue, Jun 11, 2019 at 1:50 PM Paul Berger via cctalk
wrote:
> The process documented above is essentially the process I started last
> night, but in my case I used a GPIO in my HP 9000-332 to cycle through
> the inputs and record the output. It is very handy to have general
> purpose parallel
On Tue, Jun 11, 2019 at 12:23 AM Paul Berger via cctalk
wrote:
>
>
> On 2019-06-08 7:14 a.m., Piero Andreini via cctalk wrote:
> > desperately looking for jedec file of PAL 16L8 position U69 part # 1820-2991
> We can hope that it is all combinational logic and I can run trough all
> combinations
On Sat, Jun 8, 2019 at 6:18 PM Alan Hightower via cctech
wrote:
>
>
> L series are combinatorial only. You (or someone who has a working one)
Not so. The 16L8 has feedback connectoionsfrom the outputs to the logic
array. So while there are no registers (D types), you can make SR type
circuits
On Fri, Jun 7, 2019 at 6:50 PM CuriousMarc wrote:
>
> >The clock chip seems to be a normal digital watch/clock chip. The inputs to
> >it are essentially the 'set' buttons, the outputs are the 7 segment lines and
> >digit strobes. But I have not found a data sheet on it anywhere.
> Tony, looks
On Fri, Jun 7, 2019 at 4:44 AM Curious Marc wrote:
>
> Thanks, I’ll see if I can find replacements. You can easily see how they get
> zapped: they are 2.5V chips, the NiCd battery *is* the voltage regulator.
> Charging circuit is a simple diode connected to 5V via a resistor. Battery
> dies,
On Thu, Jun 6, 2019 at 8:57 PM CuriousMarc via cctalk
wrote:
>
> All HP fans in general and Tony in particular,
> I have the exact same problem. HP98035 real time clock module
> (http://hpmuseum.net/display_item.php?hw=168), plugged into a HP9825T
> (http://hpmuseum.net/display_item.php?hw=171),
On Wed, Jun 5, 2019 at 2:45 AM Grant Taylor via cctalk
wrote:
>
> Does anyone have any experience working with modems that didn't include
> internal / auto dialers?
Only from the side of the things that talked to them, like the HP11284 interface
for the HP9830
>
> They came up in a conversation
On Fri, May 31, 2019 at 11:17 PM Jon Elson via cctalk
wrote:
> As far as I remember, there IS no removable
> cover on those HDAs, they were hermetically sealed except
> for a tiny, filtered, pressure relief vent.
Well, the HDA was assembled, so it can come apart again. The
RA82 printset gives
On Fri, May 31, 2019 at 4:12 PM Jon Elson wrote:
>
> On 05/30/2019 10:56 PM, Tony Duell via cctalk wrote:
> > [1] I feel DEC got one thing wrong here. The preamplifier
> > ICs are inside the HDA and thus can't be replaced.
> This was pretty common practice in a number of driv
On Thu, May 30, 2019 at 8:20 PM shad via cctech
wrote:
>
> Hello,
> I'm in the process of cleaning and hopefully restore to operation of a DEC
> R80.
> The unit has some minor sign of corrosion, however it's VERY dirty, even
> inside the hood.
> The filters are obviously to be removed and
On Tue, May 14, 2019 at 12:57 AM Fred Cisin via cctalk
wrote:
>
> On Mon, 13 May 2019, Chuck Guzis via cctalk wrote:
> > The last game that I recall playing with any frequency was Chess 3.0 on
> > a Cyber 74. Other games over the years have held my interest for only
> > a couple of hours, tops.
Firstly, does anyone have the printset (schematic) for the DEC LA50
printer? It's
not on Bitsavers and I can't find it anywhere else.
Secondly (and more interesting/less likely to be known) I have a thing here
called a 'Computest 3020'. It seems to be a luggable data logger. A case,
very deep
On Sun, Apr 21, 2019 at 1:33 AM Bill Degnan via cctalk
wrote:
>
> I am fashioning an RGB cable from parts. The computer (LNW80) does not
> send an "intensity" signal, it is only a 6pin rgb. The magnavox rgb 80
> display that I wish to use to receive has a pin for an intensity signal.
> Other
On Sun, Mar 24, 2019 at 2:42 PM Richard Loken via cctalk
wrote:
>
> On Sat, 23 Mar 2019, Mike Kenzie via cctalk wrote:
>
> > I have a several in Ottawa as well. A few different brands, ASR, Dec, VC
>
> Do you have any Volker-Craig user or service documentation? Docs from
> Canadian companies
On Mon, Mar 18, 2019 at 2:59 AM Earl Baugh via cctalk
wrote:
>
> Howdy,
>
> I’ve recently gotten a second Sun 3/Xxx 3 slot VME chassis, however the
> power supply is a EU version, 240v. I know on a number of “newer” power
> supplies there is a switch to go from 240 to 115. I’ve taken this one
>
On Wed, Mar 6, 2019 at 12:16 AM Alan Perry via cctech
wrote:
>
> For a little background, I had run the system for about 15 minutes, then
> it sat for a couple months while I removed the PVA from the display,
> then, when I tried to run the system again, the system started to boot
> and then the
On Wed, Feb 20, 2019 at 11:40 PM Warner Losh via cctalk
wrote:
> At least on the Rainbow the floppy chip is kept in MFM mode all the time,
> unless you've written something to hack it to read alien disks.
And modified the hardware. On the Rainbow the 'Dden/' pin of the
floppy controller chip is
On Mon, Feb 11, 2019 at 6:03 PM Noel Chiappa via cctalk
wrote:
>
> > From: Jon Elson
>
> > Likely some disk controllers did NOT SUPPORT crossing 64K boundaries!
>
> No; the RK11 spec says "[the two extended memory bits] make up a two-bit
> counter that increments each time the RKBA
On Mon, Feb 11, 2019 at 4:13 PM Jon Elson via cctalk
wrote:
>
> On 02/11/2019 07:04 AM, Noel Chiappa via cctalk wrote:
> > A look at the RK11 registers after the swap-out showed an anomaly; something
> > about the extended memory address bits? (Maybe a multi-block transfer than
> > crosses a 64KB
On Tue, Jan 8, 2019 at 9:31 PM Fred Cisin via cctalk
wrote:
> I first encountered it about 60 years ago, in fifth grade. Our textbook
> said, "PI is about 3.1416 or 22/7." Our teacher insisted that that
> sentence meant "PI is about 3.1416, or exactly 22/7." I argued it. I
> pointed out that
On Sun, Jan 6, 2019 at 5:45 AM Fritz Mueller via cctalk
wrote:
> I’m speaking of the G740 at C13 on the RK11-C backplane, appearing on sheet
> RK11-C-06 in the engineering drawings and described in the last paragraph of
> section 3.2.5 in the RK11-C manual?
>
> On my RK11-C, this is jumpered
On Sun, Jan 6, 2019 at 12:45 AM Fritz Mueller via cctalk
wrote:
> > • Try using the drive on the other bus if RSTS can be booted of from
> > DK4.
>
> Easy enough experiment to try; would need to re-jumper the G740 disk
> selection flip chip in the RK11-C too, I guess?
No. One difference
On Thu, Dec 20, 2018 at 5:21 PM emanuel stiebler via cctalk
wrote:
>
> Always wanted to have one, but they never come with a keyboard :(
Mine did, albeit with a couple of keycaps missing. But the keyboard
swithes are mechanically indentical to those on a VT52 and I had
a spare keyboard PCB from
On Sun, Dec 9, 2018 at 6:50 AM Josh Dersch via cctalk
wrote:
> If anyone has any insights into the inner workings of the RK8E (in
> particular the CRC circuit, since it's used to compare the on-disk cylinder
> address stored in the header with the cylinder selected by the RK8E's
> address
On Sun, Dec 9, 2018 at 6:50 AM Josh Dersch via cctalk
wrote:
> If anyone has any insights into the inner workings of the RK8E (in
> particular the CRC circuit, since it's used to compare the on-disk cylinder
> address stored in the header with the cylinder selected by the RK8E's
> address
On Thu, Dec 6, 2018 at 11:19 AM Liam Proven via cctalk
wrote:
>
> On Wed, 5 Dec 2018 at 23:12, Chris Hanson wrote:
> >
> > It’s a Sun-2 so it’s not really arguable whether it’s the first ever Sun
> > workstation: It’s not.
>
> Not my claim; the author of the video's. Take it up with him, if
>
On Mon, Nov 26, 2018 at 12:50 PM Dave Wade via cctalk
wrote:
>
> Folks,
>
>
>
> I have a VAXStation 4000/VLC which I would like to try to use as a
> workstation. I have a keyboard and mouse, but can't find any connector for
> the video port in the UK, and the only thing I can find in the USA is
On Sun, Nov 11, 2018 at 6:32 PM Rob Jarratt via cctalk
wrote:
>
> I am still working on the causes of a Reset on my Pro 350. One 8-pin DIP
> chip that I have traced to is marked as follows:
>
>
>
> 9643TC-B1
>
> F 8313
>
> KOREA
>
>
>
> It is very close to the F-11 chips at the bottom left and
On Sun, Nov 11, 2018 at 7:41 AM Alan Perry wrote:
>
>
>
> On 11/10/18 11:00 PM, Tony Duell wrote:
> > On Sun, Nov 11, 2018 at 6:56 AM Alan Perry wrote:
> >>
> >>
> >> On 11/10/18 10:51 PM, Tony Duell wrote:
> >>> On Sun, N
On Sun, Nov 11, 2018 at 6:56 AM Alan Perry wrote:
>
>
>
> On 11/10/18 10:51 PM, Tony Duell wrote:
> > On Sun, Nov 11, 2018 at 6:47 AM Alan Perry via cctalk
> > wrote:
> >
> >> What I got was the system unit, a VR201 monitor, a keyboard, a vertical
On Sun, Nov 11, 2018 at 6:47 AM Alan Perry via cctalk
wrote:
> What I got was the system unit, a VR201 monitor, a keyboard, a vertical
> deskside stand for the system unit, and a LQP02 daisy wheel printer. I
> also got the MS-DOS and CP/M doc and software slip cover boxes. The CP/M
> disk box is
On Sat, Nov 10, 2018 at 7:42 PM dwight via cctalk wrote:
>
> He needs a larger pulley if going from 60 to 50 ( as a motor pulley ). It
> needs to be 20% bigger because the motor turns slower on 50 Hz. 6/5 to be
> exact.
I like the way Tektronix handled this issue in the 8560 (service manual on
On Sun, Nov 4, 2018 at 12:37 PM Rob Jarratt via cctalk
wrote:
>
> I have posted previously about a DEC Pro 350 I am trying to get working
> again. At the moment it seems to be constantly resetting the CPU.
>
>
>
> I have traced one possible path for the cause of this back to a NEC chip for
>
On Sat, Nov 3, 2018 at 1:09 AM Adrian Graham via cctalk
wrote:
>
> Hi folks,
>
> This week I managed to get my paws on a machine that I only ever saw in
> ‘coming up!’ type magazine articles in the mid-80s. It’s made by a UK
> manufacturer of Viewdata set top boxes and home micro modems called
On Sun, Oct 28, 2018 at 6:10 PM Rob Jarratt wrote:
> Thanks for the datasheet. I have to say I am not totally convinced that I
> have correctly identified the reset pin on the F11 because there seems to be
> a lot of logic behind it. This particular path I am pursuing now seems a bit
> more
On Sun, Oct 28, 2018 at 5:53 PM Rob Jarratt via cctalk
wrote:
>
> I am trying to trace the reason why the CPU on my Pro 350 is apparently
> being constantly reset. I have reached a DEC 8640 chip. Does anyone have a
> pinout for it, perhaps even a datasheet, so I can understand what it is
>
On Sat, Oct 27, 2018 at 3:38 AM steve shumaker via cctalk
wrote:
>
> OK, got it. Will be my first one. Now, how does one transport the
> thing? Does it easily come off the pedestal? Can it be laid on it's
> back? Anything need to be secured before it gets moved?
It does come off the stand
t;> Radio Shack Coco joystick (which needed a different connector)
>
> On Sat, 20 Oct 2018, Tony Duell wrote:
> > And is electrically different.
> > The CoCo Joystick is a potential divider across the 5V rail. Moving the
> > joystick varies the output voltage (2 vo
On Sat, Oct 20, 2018 at 6:52 PM Fred Cisin via cctalk
wrote:
> Similarly, although they sold a joystick board, they didn't sell
> joysticks. DA15 connector for two joysticks.
> In some of the documentation, the sketch of a joystick was clearly the
> Radio Shack Coco joystick (which needed a
On Wed, Oct 17, 2018 at 9:33 AM Josh Dersch via cctalk
wrote:
> And I was wrong -- the flyback's fine (yay!). Found a nearby 0.015uF, 400V
> film capacitor that was shorted. Replaced it and now I have video! It's a
> bit dim, it's too wide, and gets wider as it warms up but it's a start :).
On Mon, Sep 10, 2018 at 2:07 PM, Robert Feldman via cctalk
wrote:
> If you want a small, portable, battery-powered terminal, get an HPLX palmtop
> (95, 100 or 200). Runs for weeks or months on two AA batteries. The HPLX
> palmtops have a VT100 emulation. I have not had a need to use it, but
On Thu, Sep 6, 2018 at 6:15 PM, Carlo Pisani via cctalk
wrote:
> I am building my own VT100 terminal (FPGA project), and it will be
> laptop-shape :P
Trend Data System (the company that made some very nice paper tape readers
made/sold such a terminal many years ago. There were at least 2
On Tue, Aug 14, 2018 at 6:01 PM, Pete Turnbull via cctalk
wrote:
> On 14/08/2018 16:52, Tony Duell via cctalk wrote:
>
>> But I have here a little square board (the same size as the older
>> Unibus grant continuity card) with just 2 pairs of pins linked. In
>> the etch
All the PDP11 people here will know the little square grant continuity
board used
in Unibus machines, along with the later dual-height one that also connected the
NPG signal. And the common Qbus grant continuity board that was also a full
dual-height one that had a couple of pairs of pins linked
On Thu, Jul 26, 2018 at 5:28 PM, Chuck Guzis via cctalk
wrote:
> On 07/26/2018 08:26 AM, Tony Duell wrote:
>
>> I believe if you want to be pedantic that a motor-generator set is a motor
>> (with an armature/rotor and a field/stator) mechanically coupled to a
>> generato
On Thu, Jul 26, 2018 at 4:14 PM, Chuck Guzis via cctalk
wrote:
> Such MG setups were very common in industry before modern
> semiconductors. When I had a summer job showing movies at a drive-in
> theater (a long time ago), the supply for the carbon-arc lamps was a
> 40hp motor powered by
> There are, however, DEC products other than the RK05 which had different
> transformers for 50 Hz and 60 Hz. For example, the H771 power supply used
> in the RX01 and RX02. There were three H771 models, The H771A for 90-132
> VAC 60 Hz, The H771C for 90-132 VAC 50 Hz, and the H771D for 180-264
On Wed, Jul 25, 2018 at 5:48 PM, Eric Smith via cctalk
wrote:
> I'm not sure about motors, but 60 Hz power transformers can't handle as
> high a maximum power (or current) when used for 50 Hz. The maximum power
> has to be derated. Some transformers are specified/sold with a single power
>
On Sat, Jul 21, 2018 at 3:26 AM, Al Kossow via cctalk
wrote:
>
>
> On 7/20/18 2:43 PM, Mattis Lind wrote:
>
>> And as Al wrote: No it is not at all QIC. The drive has four fixed tracks
>> and the encoding is MFM.
>
> These 4-track fixed-head drives were common drives prior to the invention of
On Fri, Jul 20, 2018 at 7:40 PM, Brent Hilpert via cctalk
wrote:
> If you want to power it through the charger jack, then you need to assess
> whether there is any internal charging circuitry (rectification,
> aforementioned
> current-limiting R, etc.) sitting between the jack and the cells.
On Fri, Jul 20, 2018 at 5:06 PM, Dave Wade via cctalk
wrote:
>> -Original Message-
>> From: cctalk On Behalf Of dwight via
> cctalk
>> Sent: 19 July 2018 22:17
>> To: Liam Proven ; General Discussion: On-Topic and
>> Off-Topic Posts
>> Subject: Re: GoTEK SFR1M44-U100...
>>
>> One thing
On Fri, Jul 13, 2018 at 5:35 PM, Al Kossow via cctalk
wrote:
> Man, these things are annoying.
>
> All of the bands are bad, and they leave residue on the spools.
> There are no EOT BOT holes on the HP tape, and the drive locks
I assume you mean the HP9144 and HP9145 drives/tapes. The
HP9142
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
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
> 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
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
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 th
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
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