On 2020-Apr-21, at 7:57 AM, Chris Zach via cctalk wrote:
> Well I'm starting to walk through this. First I took an IR picture of the
> boards in operation, then started troubleshooting.
>
> First I started checking voltages. J2 is easily accessible so I put a ground
> probe on pin 10, and checke
On 2020-Apr-19, at 3:09 PM, Chris Zach via cctalk wrote:
>> As I wrote earlier in the thread I think it is a good idea to check the V
>> sync and H sync signals to check that they are right in pulse length and
>> shape.
>
> Good starting point. From the schematics would that be scope probe to J
On 2020-Apr-18, at 10:03 AM, Rob Jarratt via cctalk wrote:
> I have another PSU I have been meaning to look at for a long time. This one
> has fairly high output ripple and some of the voltages do not appear to be
> where they should be. I have checked all the capacitors for ESR and they
> appear t
On 2020-Apr-15, at 5:23 PM, Chris Zach via cctalk wrote:
> Wonderful: A few weeks ago I forgot to turn off my VT52 and left it running
> for a day or two. Now the screen is filled with snow and it looks like the
> text is all over the place horozontally.
>
> Any tips or thoughts on where to s
On 2020-Apr-05, at 11:12 PM, Rob Jarratt wrote:
>>
>>> I have obtained a scope trace as you suggest. R32 is still lifted so
>>> the
>>> UC3842 is powered by the bench PSU, but I am using the full 240VAC (no
>>> variac). The channels are:
>>> 1. Ch1. 555 timer.
>>> 2. Ch2. D19 Anode
>>> 3. Ch3.
Here in Canada, ongoing for several years now, we've had the major fiasco of
the Phoenix payroll system.
I've never heard an accounting of where the fault lies, or why IBM isn't being
held more accountable.
A brief summary from Wikipedia:
The Phoenix pay system is a payroll processing system for
On 2020-Apr-05, at 2:53 PM, Rob Jarratt wrote:
> I have obtained a scope trace as you suggest. R32 is still lifted so the
> UC3842 is powered by the bench PSU, but I am using the full 240VAC (no
> variac). The channels are:
> 1.Ch1. 555 timer.
> 2.Ch2. D19 Anode
> 3.Ch3. D19 Gate.
> 4.
On 2020-Apr-05, at 6:05 AM, Rob Jarratt via cctalk wrote:
> I found time to follow Mattis’s suggestion today and I got some interesting
> results.
>
> I powered the UC3842 with about 16V from a bench power supply. I lifted R32
> so that the transformer would not supply it. I then used an isolati
On 2020-Mar-23, at 6:56 AM, emanuel stiebler via cctalk wrote:
> I have 4000/90 which behaves funny. It only starts, after switching on
> twice. The first time, all LEDs stay on, flipping the switch off/on, it
> boots happily.
>
> Any insight?
I've experienced behaviour like this in an Apple-som
On 2020-Mar-07, at 11:35 PM, Adrian Stoness wrote:
> yea i do but its not giving me anything thats making sens the value jumps all
> over the place. on the ones ive tried
If the Rs are high value, set the MM to the 2Mohm range and make sure your
fingers are not touching the metal circuit elemen
On 2020-Mar-07, at 11:10 PM, Adrian Stoness via cctalk wrote:
> trying to identify these soviet resistors anyone familiar with how they
> marked them i see 620 on these ones for the panel bulbs
> https://www.flickr.com/photos/1ajs/49633358106/in/dateposted-public/
>
> want to test all the lamps
On 2020-Mar-03, at 4:18 PM, Jules Richardson via cctalk wrote:
> Hopefully collective wisdom can help on this one - does anyone have a clue
> what system this core board was from:
> http://www.classiccmp.org/acornia/tmp/coresmall.jpg
>
> The curved edge connectors (presumably to make board inser
On 2020-Jan-17, at 4:04 AM, Guy Dunphy wrote:
> At 02:22 AM 17/01/2020 -0800, you wrote:
>>
>> On 2020-Jan-17, at 12:11 AM, William Maddox on CCTalk via cctalk wrote:
>>
>>> The seller thinks this may be a drum memory, but it is clearly not. My
>>> guess is that it is some kind of clock genera
On 2020-Jan-17, at 12:11 AM, William Maddox on CCTalk via cctalk wrote:
> The seller thinks this may be a drum memory, but it is clearly not. My
> guess is that it is some kind of clock generator. Anyone recognize this?
>
> https://www.ebay.com/itm/Vintage-Mainframe-Computer-Part-Drum-Memor
On 2020-Jan-10, at 9:08 AM, Al Kossow via cctalk wrote:
> On 1/10/20 5:18 AM, Chris Zach via cctalk wrote:
>> Right off the bat it looks like a CDC Lark pack. Wonder if the whole thing
>> is a re-badged Lark.
>
> There were three different companies that made 8" drives like that, Amcodyne,
> Dat
On 2020-Jan-01, at 6:14 PM, Anders Nelson via cctalk wrote:
> I'd love to see examples of driving circuitry if it's not too much trouble.
Remarkable that Tom found someone with spec sheets for the same type.
Two examples of in-use are here (see the linked PDFs under tech data):
http://ma
On 2020-Jan-02, at 6:11 PM, Paul Berger via cctalk wrote:
> On 2020-01-02 9:58 p.m., Nemo Nusquam via cctalk wrote:
>> On 01/02/20 17:22, Ali wrote:
>>>
>>> >Well, Canada Post stopped delivering to individual >houses years ago.
>>>
>>> How does that work?
>> Community mailboxes that serve a neigh
On 2020-Jan-01, at 2:42 PM, Anders Nelson via cctalk wrote:
> I snagged one of these Nixie-like displays (from a calculator I assume) and
> I'd like to light it up. Does anyone know where I might find the datasheet
> for it? Google hasn't turned up anything.
>
> https://www.ebay.com/itm/2641106389
On 2019-Dec-16, at 10:35 AM, Michael Brutman via cctalk wrote:
> I ran across this modem (circa 1982) and saved it, but I have no idea on
> how to control it. Bitsavers doesn't seem to have a manual for it.
>
> It's a big, blue plastic box and it looks wonderful. There is an array of
> 8 lights
On 2019-Nov-25, at 11:01 AM, Paul Koning via cctalk wrote:
>> On Nov 25, 2019, at 1:45 PM, Richard Pope via cctalk
>> wrote:
>> On 11/25/2019 12:06 PM, Noel Chiappa via cctalk wrote:
From: Fred Cisin
Is that message about 1) history of internet? (THANK YOU for specifying
"internet"
On 2019-Nov-14, at 10:23 PM, Jim Brain via cctalk wrote:
> If you look at the values received by an 8N1 connection from a sender using
> the different settings, you get:
>
> AT
> at
> At
> aT
> 7E1
> E174
> 41D4
> E1D4
> 4174
> 7O1
> 61F4
>
On 2019-Nov-14, at 9:59 PM, Brent Hilpert via cctalk wrote:
> On 2019-Nov-14, at 9:30 PM, Jim Brain via cctalk wrote:
>> On 11/14/2019 11:05 PM, Brent Hilpert via cctalk wrote:
>>>
>>> (Without having gone through the code presented in full detail, but
>
On 2019-Nov-14, at 9:30 PM, Jim Brain via cctalk wrote:
> On 11/14/2019 11:05 PM, Brent Hilpert via cctalk wrote:
>>
>> (Without having gone through the code presented in full detail, but thinking
>> from root premises.)
>>
>> ASCII A = 0x41 --> 2 bits on
&g
On 2019-Nov-14, at 6:48 PM, Jim Brain via cctalk wrote:
> Well, I am off and running on getting my version of the code up to speed:
>
> https://github.com/go4retro/tcpser
>
> Man, some of this code is rough. I have learned a lot about writing C code
> in the last decade+.
>
> Anyway, while I w
On 2019-Nov-14, at 10:26 AM, dwight via cctalk wrote:
> __
> From: cctalk on behalf of Chuck Guzis via
> cctalk
> Sent: Thursday, November 14, 2019 8:22 AM
> To: dwight via cctalk
> Subject: Re: ge first transistors
>
> On 11/14/19 8:05 AM, dwight via cctalk wrote:
On 2019-Nov-13, at 5:22 PM, Electronics Plus via cctalk wrote:
> ... I can simply connect 2 modems to each
> other via a POTS phone cable, attach each modem via serial cable to a
> different laptop, and set one to Listen and the other to Answer via
> HyperTerminal.
This will work for some modems,
On 2019-Nov-02, at 2:39 PM, Guy Dunphy via cctalk wrote:
> A rack, a Tektronix XY display,
> a rack drawer, blanking panels, some neat mysterious instruments, two 8"
> floppy drives,
> and a probable PDP-something all for $45?
For what little it matters, the rack unit immediately below the CRT
On 2019-Oct-20, at 9:14 AM, Nigel Johnson via cctalk wrote:
> On 20/10/2019 06:43, Peter Corlett via cctalk wrote:
>> On Sat, Oct 19, 2019 at 02:23:46PM -0400, Nigel Johnson via cctalk wrote:
>>> Judging by the year, it was probably a teletext terminal. [...]
>> It's not Teletext, unless that word
On 2019-Oct-14, at 12:46 PM, Chuck Guzis via cctalk wrote:
> On 10/14/19 12:26 PM, Al Kossow via cctalk wrote:
>>
>> On 10/14/19 9:32 AM, Daniel Seagraves via cctalk wrote:
>>> What’s the best way to restore a dull BOT marker
>>
>> replace it
>>
>> there were rolls of brady BOT tape on ebay but
On 2019-Oct-10, at 5:33 AM, Wouter de Waal via cctech wrote:
>> Very likely a semi custom or custom memory device, due to the prefix.
>
> Armed with that and the fact that pin 1 connects to the leadframe I figured
> maybe it's something like the 6830 Mikbug prom -- 0V on 1, 5V on 12, data on
> t
On 2019-Sep-27, at 6:47 AM, Paul Koning via cctalk wrote:
> I make it a habit to assume that every email which contains just a link but
> no explanation is a scam with a forged sender address.
>
> Ed, if this is actually from you and actually real, and you want people to
> look at it, you need t
On 2019-Sep-25, at 3:07 AM, Guy Dunphy via cctalk wrote:
> Does anyone else recognise some of the other boards?
There is a stack of IO interface boards, including HSTs, for the HP 2100/1000
series there.
Lower-right stack in this pic, 7 boards, boards have one red and one grey
handle:
On 2019-Sep-23, at 4:24 PM, Kevin Parker via cctalk wrote:
> I resurrected an old keyboard and mouse I like. Not wishing to gross anyone
> out but it looks like over time there was a build-up of oil etc from my
> hands etc and over time being stored away its turned to a really almost hard
> paste l
On 2019-Sep-02, at 9:35 AM, 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
> suppl
On 2019-Aug-30, at 7:24 PM, John Ames via cctalk wrote:
> Ran into this at the electronics-surplus store just down the way from
> my workplace and grabbed it on the cheap. I don't actually know what
> it *is,* but the labels on the switches make it look a *hell* of a lot
> like a 16-bit general-pur
On 2019-Aug-16, at 11:56 AM, systems_glitch via cctalk wrote:
> On Fri, Aug 16, 2019 at 2:53 PM Paul Koning wrote:
>>
>>> On Aug 16, 2019, at 2:43 PM, systems_glitch via cctalk <
>>>
>>> I'm sure DEC wouldn't have bothered with hard gold plating if their
>>> connectors were metallurgically incom
On 2019-Aug-14, at 1:26 PM, Allison Parent via cctalk wrote:
> IPhoned it in!
>
>> On Aug 14, 2019, at 2:19 PM, Noel Chiappa via cctalk
>> wrote:
>>
>> From: Jonathan (systems_glitch)
>
>> Yep, fun times on LSI-11/2!
>
> Heh, this one was _utterly trivial_ compared to the 'must have working m
On 2019-Jul-29, at 6:34 PM, Jim Brain via cctalk wrote:
> I have an ill NLS MS-230 Miniscope. Is there anyone on list that might be
> interested in getting it running for me? I'm willing pay for the privilege.
> I'd like to see the unit working, but I have no experience with analog
> scopes,
On 2019-Jul-24, at 10:31 AM, Jeffrey S. Worley via cctalk wrote:
> Yesterday evening, in the process of refurbishing five very badly
> treated Atari 800 computers I had a hunch and subjected a failed Pokey
> chip (Atari Part CO12294 Wikki link https://en.wikipedia.org/wiki/POKEY
>) to high hea
On 2019-Jul-13, at 1:48 PM, Lyndon Nerenberg via cctalk wrote:
> Another of the un-acknowledged people in the upcoming July 29
> 'celebrations'.
>
> https://www.theguardian.com/technology/2019/jul/13/margaret-hamilton-computer-scientist-interview-software-apollo-missions-1969-moon-landing-nasa-wom
On 2019-Jun-10, at 11:11 AM, Mark J. Blair via cctalk wrote:
> I wouldn’t invest in an IoT buzzword company whose web page admits that the
> products they are talking about don’t exist yet, headed by a non-engineer,
> even without the fishy international money laundering smell. It’s interesting
On 2019-May-27, at 5:53 PM, Glen Slick via cctalk wrote:
> On Mon, May 27, 2019 at 4:14 PM shad via cctech
> wrote:
>>
>> Hello,
>> do you know the people who made the video?
>> I think the factory is the Satilai in Saronno.
>>
>> Andrea
>
> I believe those guys are based somewhere in the U
Didn't this start out with the RUN LED not lighting up?
I don't recall it being mentioned that that was repaired.
Perhaps pursue fixing that - while it may be a secondary problem that
doesn't resolve a 'bigger' problem, it could be that it uncovers a common
problem.
On 2019-May-20, at 12:11 AM, Glen Slick via cctalk wrote:
> On Sun, May 19, 2019 at 11:48 PM Brent Hilpert via cctalk
> wrote:
>>
>> Except the SRUN (K8 SRUN L) action is not latched, so it probably appears as
>> an
>> active-low heartbeat pulse with some period
On 2019-May-19, at 9:09 PM, Glen Slick via cctalk wrote:
> On Sun, May 19, 2019 at 8:05 PM Mister PDP via cctalk
> wrote:
>>
>> After that, I decided to try and find out why the
>> Run/Halt light was not coming on when I hit the switch. Looking at the H11
>> schematics, the light relies on the SR
So it appears it went for 168 K$ at hammer.
With buyer's premium, that puts the sale price at 210 K$.
https://www.rrauction.com/bidtracker_detail.cfm?IN=5222
On 2019-Apr-18, at 9:30 AM, Chuck Guzis via cctalk wrote:
> On 4/18/19 9:02 AM, Jim Manley via cctalk wrote:
>> Jussi Kilpelainen's page cited above (
>> https://www.tindie.com/products/kilpelaj/core-memory-shield-for-arduino/)
>> refers to the work of Ben North and Oliver Nash to create another co
On 2019-Apr-18, at 8:47 AM, Jon Elson wrote:
> On 04/18/2019 04:49 AM, Brent Hilpert via cctalk wrote:
>> It's a 4-wire 3D planar array. By topology and construction I would guess it
>> date it from the 60s.
> Make that EARLY '60s. As soon as somebody figured out t
On 2019-Apr-17, at 9:47 PM, Grant Taylor via cctalk wrote:
> On 4/17/19 10:30 PM, Andrew Luke Nesbit via cctalk wrote:
>> Hello all,
>
> Hi,
>
>> I have been wanting to acquire a plane of magnetic core memory as a piece of
>> computing history. My partner actually thinks they look very beautifu
On 2019-Apr-15, at 1:29 PM, William Donzelli wrote:
>> It doesn't show up here:
>>
>> https://en.wikipedia.org/wiki/List_of_military_electronics_of_the_United_States
>
> I think 99.99mumble percent of JETDS systems ("AN/") do not show up on
> that list.
>
> I have a 1972 edition of one of
On 2019-Apr-15, at 12:16 PM, ED SHARPE via cctalk wrote:
> It is in a metal suitcase appears to be military analog computer Ed!
>
> On 4/14/2019 5:44 PM, Sam O'nella via cctalk wrote:
>> Is there a specific reference you have for this?
>>
>>> On Apr 14, 2019, at 2:16 AM, ED SHARPE via ccta
On 2019-Apr-11, at 10:04 PM, Paul Birkel via cctalk wrote:
>
> Now consider a DSKY. Currently at $27,500.00. Auction estimate: $60,000+
> Great provenance! “The DSKY that saved Apollo 14.”
>
> https://www.rrauction.com/bidtracker_detail.cfm?IN=5222
I looked up this auction too, after Marc me
On 2019-Apr-03, at 11:17 PM, Pontus Pihlgren via cctalk wrote:
> Could you provide an URL. ebay search works (or not works) in mysterious
> ways.
https://www.ebay.com/itm/Digital-Equipment-PDP-10-Control-Console/183760017149
https://www.ebay.com/itm/ULTRA-Rare-Vintage-ORIGINAL-KENBAK-1-aka-CTI
On 2019-Mar-26, at 9:28 AM, Noel Chiappa via cctalk wrote:
>> From: Ben Bfranchuk
>
>> Now they seem to have have found a SCRAPPED Apollo guidance
>> computer and am rebuilding the missing pieces.
>
> Wow. What a great site (and that guy has mad skills, everything from
> repairing old Teletypes,
On 2019-Mar-24, at 3:14 PM, ben via cctalk wrote:
> On 3/24/2019 10:27 AM, Mike Stein via cctalk wrote:
>> And I have some in Toronto; Falco, ADM-11 and bits & pieces.
> Did anyone out there (In Canada) buy the surplus VideoTex terminals,
> I saw Many Many years ago.
Like this?:
http:/
On 2019-Mar-22, at 11:14 AM, Chuck Guzis via cctalk wrote:
> On 3/22/19 10:28 AM, Glen Slick via cctalk wrote:
>> On Fri, Mar 22, 2019 at 9:59 AM Chuck Guzis via cctalk
>> wrote:
>>>
>>> At the expense of being boo-ed for this, could the original Rockwell
>>> stuff perhaps have been assembled usi
On 2019-Mar-12, at 1:21 AM, shad via cctech wrote:
> I always have been amazed by the complexity and peculiarity of
> fixed/removable hybrid discs like DEC RC25 and CDC 9457.
> Looking at some specifications found on the web, these drives look quite
> similar each other, even if these are compl
On 2019-Mar-11, at 2:37 PM, allison via cctech wrote:
> On 03/11/2019 02:11 PM, Jay Jaeger via cctech wrote:
>> I have several PDP-11's in my collection (among other things), and not
>> enough PC05 tape readers (or enough room) to go around. But most if not
>> all of my machines have M7810 PC11 in
On 2019-Mar-11, at 2:37 PM, allison via cctech wrote:
> On 03/11/2019 02:11 PM, Jay Jaeger via cctech wrote:
>> I have several PDP-11's in my collection (among other things), and not
>> enough PC05 tape readers (or enough room) to go around. But most if not
>> all of my machines have M7810 PC11 in
On 2019-Mar-10, at 5:16 PM, Al Kossow via cctalk wrote:
> On 3/10/19 2:18 PM, Murray McCullough via cctalk wrote:
>> Historians, though not all, credit this development as the
>> beginning of the electronic-computing revolution that was truly underway by
>> the mid-70s.
>
> Scotty, more power to t
On 2019-Mar-10, at 3:59 PM, Will Cooke via cctalk wrote:
>> On 3/10/2019 3:18 PM, Murray McCullough via cctalk wrote:
>>> Back in 1965 Jack Kilby, Jerry Merryman and James Van Tassel at texas
>>> Instruments created an integrated circuit designed to replace the
>>> calulator. Historians, though not
On 2019-Mar-05, at 10:07 PM, Richard Loken wrote:
> On Tue, 5 Mar 2019, Brent Hilpert via cctalk wrote:
>
>> TRIUMF was using /11s for cyclotron control I believe, that's not where you
>> anticipate UNIX showing up.
>
> But was it Unix or something else
On 2019-Mar-05, at 8:36 PM, Warner Losh via cctalk wrote:
> On Tue, Mar 5, 2019 at 5:17 PM Al Kossow via cctalk
> wrote:
>> On 3/5/19 5:16 PM, Al Kossow via cctalk wrote:
>>> Today's tape recovery gem. UBC's PDP-11 UNIX tools distribution ca. 1983
>>
>> oh.. and Bill Webb's name is all over this
On 2019-Feb-24, at 2:03 AM, GerardCJAT via cctalk wrote:
> Back in ''70, sometimes we were running "basic" BASIC ( NOT Time sharing ) on
> 2116B, 2100A, just for FUN.
>
> Is there some copy still around ??
>
> I had a look in Google, Bitsavers, HPmuseum, with NO success.
>
> Thank for help and
On 2019-Feb-06, at 10:37 PM, Fritz Mueller via cctalk wrote:
>> 4116 datasheet specs 2mS, my calcs give a refresh period of 1.5mS, the
>> 14.5uS from the manual would give 1.86 mS, 7% shy of 2.
>> The schematic specs 1% resistors, and the parts list does appear to spec a
>> high-tolerance "1%200
On 2019-Feb-06, at 7:48 PM, Chuck Guzis via cctalk wrote:
> On 2/6/19 6:33 PM, Brent Hilpert via cctalk wrote:
>
>> Granted you could drill the holes from the rear of the flange,
>> however from what I can see the hinge design doesn't look like it
>> will allow the
On 2019-Feb-06, at 4:19 PM, Chuck Guzis via cctalk wrote:
> On 2/6/19 2:29 PM, Brent Hilpert via cctalk wrote:
>
>> (I take it you mean "now look at the -left- side".)
>
> Well, you know, my *other* right... :)
>
>> However, looking at my 7970A, it a
On 2019-Feb-06, at 5:29 PM, Paul Koning wrote:
>> On Feb 6, 2019, at 8:25 PM, Brent Hilpert via cctalk
>> wrote:
>> On 2019-Feb-06, at 5:11 PM, Fritz Mueller via cctalk wrote:
>>>>> On Feb 6, 2019, at 2:24 PM, Brent Hilpert via cctalk
>>>>> wr
On 2019-Feb-06, at 3:39 PM, Fritz Mueller wrote:
>> On Feb 6, 2019, at 2:24 PM, Brent Hilpert via cctalk
>> wrote:
>>
>> Is the schematic available for the memory board at-issue?
>> Curious myself to see what approach for refresh DEC used.
>
> Yes, here:
On 2019-Feb-06, at 5:11 PM, Fritz Mueller via cctalk wrote:
>>> On Feb 6, 2019, at 2:24 PM, Brent Hilpert via cctalk
>>> wrote:
>>>
>>> Is the schematic available for the memory board at-issue?
>>> Curious myself to see what approach for
On 2019-Feb-06, at 12:24 PM, Chuck Guzis via cctalk wrote:
> On 2/6/19 11:25 AM, Jay West wrote:
>
>> Yes, it's all "standard 19 inch" but. the HP gear and mounting
>> kits of that time expected certain things to be present in the rack
>> design/construction well beyond just the space betwe
On 2019-Feb-06, at 1:21 PM, Noel Chiappa via cctalk wrote:
>> From: Brent Hilpert
>
>> what about the refresh circuitry of the memory board?
>> ...
>> It might also explain why a number of 4116s were (apparently) failing
>> earlier in the efforts ... replacing them might have just replaced them
>>
On 2019-Feb-06, at 10:53 AM, Noel Chiappa via cctalk wrote:
>
> I'm not sure that's going to tell us much: the latest development is that
> Fritz looked at the actual memory contents again, and it is once again
> trash; _almost_ identical to what was there before:
>
> PA:171600: 016162 004767 00
On 2019-Feb-04, at 3:40 PM, Jack Harper via cctalk wrote:
>
> I am mounting a couple of heavy (130-pounds each) HP7970e tape drives to a
> 19" rack.
>
> The screw holes that mate to the standard spaced holes on the right side of
> the drive after you open the case are visible and obvious.
>
>
On 2018-Dec-28, at 4:43 PM, Adrian Stoness via cctalk wrote:
> have u seen the agc being fired up videos
Yes, videos from list member curiousMarc :
Episode 1: https://www.youtube.com/watch?v=2KSahAoOLdU
He's up to Episode 5, the others should show up in subsequent links from the
1st.
On 2018-Dec-09, at 2:06 PM, Adrian Graham via cctalk wrote:
>> On 9 Dec 2018, at 21:40, Mattis Lind via cctalk
>> wrote:
>>
>> Don't know if this worth saving. https://www.ebay.com/itm/283294561797
>>
>> 8 inch CDC disks from 1982. Maybe something interesting?
>
> It might be just me, but thos
On 2018-Nov-20, at 11:18 AM, Paul Koning wrote:
>> On Nov 20, 2018, at 2:07 PM, Brent Hilpert via cctalk
>> wrote:
>>
>> ...
>> The PCB-transformer key design is novel, but (in the TS-1) so is the
>> scanning & communication.
>> There is n
On 2018-Nov-20, at 11:42 AM, Al Kossow via cctalk wrote:
> On 11/20/18 11:28 AM, Brent Hilpert via cctalk wrote:
>
>> Were there 3 PROMs on the TS-1? I don't remember
>
> There are three bipolar proms on the 2624 that you can see on the pcb picture
> I still need
On 2018-Nov-20, at 1:21 AM, Mike Stein via cctalk wrote:
> - Original Message -
> From: "Al Kossow via cctalk"
> To: "General Discussion: On-Topic and Off-Topic Posts"
> Sent: Monday, November 19, 2018 6:29 PM
> Subject: Battery warning in Falco terminals
> ...
>> Also, I suspect the fi
On 2018-Nov-20, at 5:11 AM, Al Kossow via cctalk wrote:
> On 11/19/18 11:54 PM, Brent Hilpert wrote:
>
>> I didn't have need / get as far as doing an I/O map or memory map for the
>> Z80.
>>
>> Should I send these files along?
>>
>
> Yes, please to dumps/docs and board/terminal pics from you a
On 2018-Nov-19, at 3:29 PM, Al Kossow via cctalk wrote:
> I've been helping the MAME guys simulate a TS-2624, which is a block mode HP
> emulating terminal.
> I had bought this a while ago, and never dumped the firmware. Unfortunately
> there is a large
> NiCd battery right in the middle of the
On 2018-Nov-11, at 2:04 PM, Rob Jarratt wrote:
>> -Original Message-
>> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Brent
>> Hilpert via cctalk
>> Sent: 11 November 2018 21:50
>> To: General Discussion: On-Topic and Off-Topic Posts
&g
On 2018-Nov-11, at 1:32 PM, Rob Jarratt wrote:
>> -Original Message-
>> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Brent
>> Hilpert via cctalk
>>
>> On 2018-Nov-11, at 11:52 AM, Rob Jarratt via cctalk wrote:
>>> Thanks for all
On 2018-Nov-11, at 11:52 AM, Rob Jarratt via cctalk wrote:
> Thanks for all the replies. If that is indeed what it is, then I still have
> not been able to find the source of one of the signals that seems to be
> causing the Reset, every pin I have found so far is an input, I have not
> found it
On 2018-Nov-03, at 9:27 PM, Guy Dunphy via cctalk wrote:
. . .
> The front panel is in pieces atm. And clean now.
> Incidentally, several people called the material used for the lamps shroud
> plate 'MDF.'
> It's not, it's that high density cloth+bakelite (or something) material used
> for electr
On 2018-Oct-30, at 8:07 AM, Klemens Krause via cctalk wrote:
> Is there anybody out with a working classic PDP-8?
>
> For a long time we had the problem, that starting a program on our 8 by
> pressing keys, this program crashed. Examining the memory
> contents showed, that typically one or two
On 2018-Oct-05, at 5:38 PM, Kevin Parker via cctalk wrote:
> Be most grateful if anyone can advise here please. Rescued a TRS-80 MC10 from
> deceased estate recently - it was headed for the bin
> but got saved.
>
> The original owner was a bit of an electronics hobbyist and his
> brother-in-law
On 2018-Sep-23, at 7:46 AM, Michael Thompson via cctech wrote:
> Visitors to the RICM like to play SPACEWAR! in the PDP-12. Unfortunately
> using the console switches is uncomfortable, not intuitive, and is tough on
> the switches. We would like to recreate the switch boxes used on the PDP-1
> to
On 2018-Sep-23, at 7:46 AM, Michael Thompson via cctech wrote:
> Visitors to the RICM like to play SPACEWAR! in the PDP-12. Unfortunately
> using the console switches is uncomfortable, not intuitive, and is tough on
> the switches. We would like to recreate the switch boxes used on the PDP-1
> to m
On 2018-Sep-22, at 11:54 AM, Noel Chiappa via cctalk wrote:
>> From: Brent Hilpert
>
>> A glance at the schematic ... you might think it's just a linear
>> regulator
>
> And the writeup in the maint manual gives that impression too, which didn't
> help! (Hence my assumtion that it was acting in t
On 2018-Sep-21, at 4:03 PM, Noel Chiappa via cctalk wrote:
>> From: Brent Hilpert
>
>> In typical "down-converters" there are additional current paths in the
>> supply, paralleling the input path, that can provide the 'additional'
>> electron flow rate. ... the whole rationale of a switching su
On 2018-Sep-21, at 4:03 PM, Noel Chiappa via cctalk wrote:
>> From: Brent Hilpert
>
>> If the heatsinks seem huge compared to modern day supplies, that's more
>> likely the result of technology improvements - faster devices, and
>> moving from bipolar switching transistors to mosfets. Bipolar
>> t
On 2018-Sep-21, at 3:20 PM, Noel Chiappa via cctalk wrote:
>> From: Mattis Lind
>
>> The H744 is a buck converter. You can read about buck converters here:
>> https://en.wikipedia.org/wiki/Buck_converter
>
> Wow, that was incredibly hard to read; no clear and simple explanation of the
> basic
On 2018-Sep-21, at 1:03 PM, Noel Chiappa via cctalk wrote:
> Oh, one thing I forgot to include:
>
>> a lot of the incoming power in that 30V AC has to be thrown away, in
>> producing +5V.
>
> So, if my understanding is correct, the 'switching' H744 really isn't much
> better than a classic linear
On 2018-Sep-21, at 12:38 PM, Noel Chiappa via cctalk wrote:
> So there's something about the H744 I'm not sure I understand; hopefully those
> with more analog-fu will set me straight if I'm confused.
>
> This supply runs off 20-30V AC. It takes the input AC, rectifies it, and runs
> it through
On 2018-Sep-03, at 8:39 AM, jos via cctalk wrote:
> the following late fifties HP equipment is available in Switzerland.
> Stored in less than ideal conditions, but seem otherwise quite OK.
>
> Feel free to forward to more fitting mailing list / fora.
>
> Not my equipment, my only interest in thi
On 2018-Jul-25, at 6:47 AM, Christian Corti via cctalk wrote:
> On Wed, 25 Jul 2018, it was written
>> Christian, when I was restoring the HP Computer Museum's 2116A I ordered a
>> bunch of these 345 bulbs from 1000bulbs.com - but it seems they no longer
>> stock them.
>>
>> I did find this listin
On 2018-Jul-20, at 10:18 AM, Jules Richardson via cctalk wrote:
> Anyone got pinout/spec information for a MOS MCS2529? In particular, I'm
> curious about operating voltage. I acquired a Melcor SC-635 calculator
> yesterday and there seems to be some uncertainty about the output voltage of
> its
The HP9830 (1972) with it's ROM'ed BASIC works this way.
LIST produces a 'cleaned up' version of the source code.
On 2018-Jul-17, at 1:21 PM, Guy Sotomayor Jr via cctalk wrote:
> I should also mention that for the IBM S/23, once the BASIC program is
> entered, the original
> source is discarde
On 2018-Jul-03, at 5:59 PM, Jon Elson via cctalk wrote:
> On 07/03/2018 03:35 PM, Ian Finder via cctalk wrote:
>> On Tue, Jul 3, 2018 at 1:21 PM, Monty McGraw via cctalk <
>> cctalk@classiccmp.org> wrote:
>>
>>> I've been repairing my Tektronix 4052.
>>>
>>> I've got the digital logic working - b
101 - 200 of 281 matches
Mail list logo
