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The Book of Taliesyn
Приєднався 1 лис 2020
In ages past when spells were cast
In a time of men in steel
When a man was taught no special thing
It was all done by feel
"All the sciences of the world are collected in my breast,
for I know what has been, what is now,
and what hereafter will occur..."
ua-cam.com/video/uYZaXo4jOu0/v-deo.html&list (Deep Purple, 2nd Album, The Book of Taliesyn)
ua-cam.com/video/L2frAPi1Pv8/v-deo.html (The Doors)
ua-cam.com/video/MkcumppLBXw/v-deo.html (Led Zepplin 3)
ua-cam.com/video/AwwJ35ooyQg/v-deo.html (Cream: Those were the days)
suno.com/song/43794f8f-90e4-422c-aaf2-17aedb07cfcf
ua-cam.com/video/chA5IiTB4wg/v-deo.html
ua-cam.com/video/lW1XykerqXs/v-deo.html
In a time of men in steel
When a man was taught no special thing
It was all done by feel
"All the sciences of the world are collected in my breast,
for I know what has been, what is now,
and what hereafter will occur..."
ua-cam.com/video/uYZaXo4jOu0/v-deo.html&list (Deep Purple, 2nd Album, The Book of Taliesyn)
ua-cam.com/video/L2frAPi1Pv8/v-deo.html (The Doors)
ua-cam.com/video/MkcumppLBXw/v-deo.html (Led Zepplin 3)
ua-cam.com/video/AwwJ35ooyQg/v-deo.html (Cream: Those were the days)
suno.com/song/43794f8f-90e4-422c-aaf2-17aedb07cfcf
ua-cam.com/video/chA5IiTB4wg/v-deo.html
ua-cam.com/video/lW1XykerqXs/v-deo.html
A very brief overview of parallel port driven home made EPROM programmer. DSCN0481
The data seen in the EPROM being read is the translation table for the ANI for the step switch.
These are just a very few of the surface highlights of my home made
EPROM programmer. It works by using 10 binary bits from the parallel
port. 8 of those bits are for the data which can be anything in the range
from 00 to FF. Then there are two more bits used. One of those bits
acts to increment the address counter on the external programmer circuit,
and the 2nd of those two bits makes the programming pulse that does the loading of the data into the EPROM. All (10) of those bits coming from the
computer's parallel port go straight to 4N35 optocouplers via a 4.7 k
resistor. This assures a very low loading on each port bit and this method also completely isolates the computer's 5 volt supply from the 5 volt supply
used to run the external circuit. The programmer circuit has many options
to enable it to operate many types of EPROMS and other memory types.
These are just a very few of the surface highlights of my home made
EPROM programmer. It works by using 10 binary bits from the parallel
port. 8 of those bits are for the data which can be anything in the range
from 00 to FF. Then there are two more bits used. One of those bits
acts to increment the address counter on the external programmer circuit,
and the 2nd of those two bits makes the programming pulse that does the loading of the data into the EPROM. All (10) of those bits coming from the
computer's parallel port go straight to 4N35 optocouplers via a 4.7 k
resistor. This assures a very low loading on each port bit and this method also completely isolates the computer's 5 volt supply from the 5 volt supply
used to run the external circuit. The programmer circuit has many options
to enable it to operate many types of EPROMS and other memory types.
Переглядів: 61
Відео
A 3 AM call from John Dowland DSCN0473
Переглядів 199Місяць тому
In memory of John Dowland, and his music. Born 1563, died 1626.
North Electric model 7H6 "North Galion" phone DSCN0471
Переглядів 2,9 тис.Місяць тому
Received this phone as a junker. The housing was all busted up and had a big chunk missing from the bottom-front. There was no ringer coil and clapper assembly in it, although the (2) bells are the originals and were in place. It has 1950 dates stamped inside. Original cloth line cord was not salvagable, but original cloth handset cord was, and is seen here in use. I came up with a mixture of b...
Card 6: Milliwatt Test and FM radio line. DSCN0470
Переглядів 95Місяць тому
Milliwatt Tests were (and still are, these things still can be found and called in the modern phone network), used for transmission level testing. The idea is to have a known frequency being transmitted at a known level. These are typically 1000 cycles at 0 db. (they had to later change it to 1004 cycles because of some weird aliasing that happens when you sample at 8 kHz on a T1 channel)... So...
Sweep tone tests. Low to high, and high to low. DSCN0469
Переглядів 256Місяць тому
Sweep tone test numbers were to be found in lots of the larger offices. In Milwaukee back in the 1970s, they were scattered all over the metro area in all of the #1 and #5 crossbars and even in the downtown panel BRoadway exchange. The sweep tests were prefix 0008. It was an unsupervised line so it could be called long distance and there would be no bill for the call. (414) XXX-0008. Gone for m...
Charge Test DSCN0467
Переглядів 148Місяць тому
This is the 2nd of the two supervision tests on card #5. The other supe test is the "classic supervision test" shown in a separate video. This Charge Test is modeled after one that was in area code (312) back in the early 1970s. I think it was in Chicago. There were never very many of these. Only a couple in the old network. Featured here are the indicator LEDs on the card front and you can als...
This is the classic supervision test.
Переглядів 683Місяць тому
This type of supervision test was found in most #1 and #5 crossbar offices. This is my recreation of it, based upon memory and from listening to the Evan Doorbell tapes. Since there was a snarky comment about lack of explanation, here it is, copied and pasted from an answer I made to a previous inquiry,: In the days of the old electro-mechanical telephone network, most exchanges of any size had...
These are two of the supervision tests. 60 IPM and 120 IPM. DSCN0463
Переглядів 145Місяць тому
SUP Tests. Sorry about the modulation by the ceiling fan of the dialtone. Comes with the territory when there are spinning blades nearby. Got to keep that fan running otherwise the power supply gets too hot.
Tone Applier explained DSCN0461
Переглядів 376Місяць тому
In the old long distance network there were Tone Appliers. The idea for them was due to the fact that most busy signals in earlier times flashed supervision. Tone Appliers were added in some tandem switches because it was thought that should there be a call that goes through many long distance links, possibly the sound of a busy signal could get lost in the noise. So they added the tone applier...
Multifrequency Sender and Receiver DSCN0460
Переглядів 175Місяць тому
This is the MF trunk. It stores, sends and receives MF. The actual single-pair loop between the MF sender and the MF receiver is only about 200 feet. But it is fully capable of being several miles.
The twins. A pair of nixie clocks. DSCN0458
Переглядів 3762 місяці тому
The larger clock was made in 1994-1995. It uses the 16 button keyboard to set it. It has an alarm and it does 12 or 24 hour modes. It uses National NL-807 tubes for hours and minutes. NL-803 tubes for seconds. The smaller clock was made in 2010. It features National NL-6844A tubes. Larger clock has upper box made with real glass. Smaller clock is 1/8 inch clear plexiglas bolted to inside-frame ...
Experimental 8422 nixie clock in switchroom DSCN0457
Переглядів 7962 місяці тому
This is the experiment table in the switchroom. It has several circuits that have been there a long time to be tested. One of them featured here is the nixie clock that uses the 8422 tubes. Also seen here is part of the automatic testboard experiment, which is also ongoing and has been in progress for the past 15 years.
20 button 2500 telephone DSCN0455
Переглядів 3232 місяці тому
This video shows a regular old Western Electric 2500 style touchtone telephone with a 12-button 35Y style touchtone pad, that has been converted into a 20-button touchtone by bringing out the 1633 Hz and approximately 1880 or 1890 Hz column tones. The 1880/1890 Hz was not intentionally designed to be a coil tap. It is the end of that coil. It works, it makes perfectly recognizable and decodable...
30 I.P.M. reorder DSCN0453
Переглядів 1382 місяці тому
Not a well known or often used reorder. But there are Evan Doorbell recordings of it in a very few places he found it on the public switched network of the 1970s. Made here, just.........because.........
ANI then callback circuit. DSCN0452
Переглядів 1,3 тис.2 місяці тому
ANI then callback circuit. DSCN0452
Stepper tour part 2 Through the hole in the wall. DSCN0451
Переглядів 1022 місяці тому
Stepper tour part 2 Through the hole in the wall. DSCN0451
Overview of 200 line, 5 path Stepper DSCN0450
Переглядів 6962 місяці тому
Overview of 200 line, 5 path Stepper DSCN0450
A call is placed to 622 the talking clock.
Переглядів 3122 місяці тому
A call is placed to 622 the talking clock.
ANI part two. Shows some other parts of it across the room. DSCN0448
Переглядів 1912 місяці тому
ANI part two. Shows some other parts of it across the room. DSCN0448
Home Made automatic number identification (ANI) for 200 line step-by-step exchange. DSCN0447
Переглядів 4932 місяці тому
Home Made automatic number identification (ANI) for 200 line step-by-step exchange. DSCN0447
That is a very nice telephone.
Very cool!
Thankyou..for you great Vids👍
Thanks! Nice work!
What is happening here?
In the days of the old electro-mechanical telephone network, most exchanges of any size had these test numbers. The term "supervision" comes from the old operator cord boards on which there was a lamp for each line. When that line was in the "off-hook" or "answered" condition, the supervision lamp on the operator's board would light up, letting her know the line was in use. As time progressed, and after Direct Distance Dialing (DDD) came out, then people could dial their own long distance calls. In order to keep track of how long they talked and then to bill them accordingly, some automatic way to monitor the "supervision" of every line had to be implemented. ---------------------------------------------------------------------------------------------------------------------------------- In this way, the old "supervisory" lamp circuits for operators slowly got redefined and used for billing. In a step office such as mine, when a called line answers and goes "off-hook" the line DC polarity reverses. This is known as "reversed polarity supervision". It can be seen in this video on the ammeter which monitors the testboard's outgoing line. That meter has zero at the center. RIGHT of center is STRAIGHT line polarity with Tip being positive and Ring being negative. When the meter needle passes through zero and goes left of center, that is reversed polarity. Remember it this way "Left is the REVERSE of normal". ------------------------------------------------------------------------------------------------------------------------------------- So a supervision test is a number that when called acts like someone picking up and hanging up a phone. Its purpose is to test the action of the supervisory relays. Hope this helps explain. Please go look up Evan Doorbell and all of his old phone tapes. He explains it all in much greater detail. Keep the questions coming guys! I am happy to answer them all!
Sweep tone test?
Yes. Card #4. Sweep Tone Tests. There are two sweep tests on that card. Coming up soon. Stay Tuned. 😎
Love it. I wish I had the space available to keep my projects around for that long. Thanks for posting the video.
I could be mistaken, but seem to recall some training film from the forties that indicated this tone on answer was to alert a long distance operator of pick-up of the called party. I suppose helpful if answer supervision on a multiple tandem call was not present, similar to this recording: ua-cam.com/video/_KUwH2BrMf0/v-deo.htmlsi=Xo4PCY-eCgnnT1mJ&t=36
Yes that is likely true too. Back in those days, some long distance trunks were fairly faint, rather noisy, and low in level. Then after a few of them would be stacked end-to-end as was done quite frequently, the transmission was not only low in level, but quite flat in frequency response as well. It then amounted to a very tinny sounding, far away, noisy connection that sometimes was difficult to talk through. Operators in those days were required to pronounce numbers in a very specific way to be understood through such connections. Instead of just saying "nine" she would say "NYE---Uhhn". Not unlike the phonetic alphabet and numbers used by pilots and military. (they say nine-er). But that ubiquitous "BAWWWWP" of old city-dialtone burst when a long distance call picked up was a big part of my boyhood telephone memories. So I brought it back on my private exchange, so that we can continue to enjoy it! ⚔⚡⚡
@@leroyjones6958 I was an AT&T TSPS operator in summer 1987 and there were a few old biddies in the office who had stories! Apparently they used to "accidentally" brush a colleague with ringing current on a cord when bored! (I then moved on to 1A2 installation, and eventually PBX's like Horizon and Dimension - all gone now!) Love your setup!
@@AlexisKasperavicius Oh yes. I remember when TSPS was brand new! We phone phreaks called it "tiss-piss" because it thwarted many good old hacks such as down-upping the hookswitch at just the right time to interrupt the ANI MF spill that the 4A machine downtown issued out to the CAMA equipment. We called this humble procedure "CAMA Fraud" and here is how it worked: After down-upping the hookswitch just as the 4A was about to go "ka-BEEP-click", there would be a long delay, a ring, and then a CAMA operator would come on and ask for the originating number because ANI failed so now they must ask. Well it turns out that in a crossbar #1 office such as my phone at the time was in, those CAMA operators could accept anything in the local marker group of the originating exchange. In my case the local marker group consisted of (4) prefixes so that amounted to my choice of 40,000 numbers to give her. As long as it was in this group, the call would go through after she entered it. I'd usually give her a test number such as a sweep tone or loop-around or something. ---------------------------------------------------------------------------------------------------------------------- TSPS put an abrupt end to that. But then a few months later after high school a girl I knew from school hired on as a TSPS operator. I would dial 411 and play operator roulette until she answered and I'd say hello to her using her name and she'd freak out until she realized it was me! Because back at that time they routed directory assistance out to the then brand new TSPS center. Good times. -------------------------------------------------------------------------------------------------------------------------- It all went away. So I have had to build my own. I do also have a little 1A2 that works in a 5 member hunt group in the stepper.
Amazing! That installation is gorgeous! Nice work!
Absolutely Stunning...Can I please have your address+what times are u out and where do u hide,ya Spare Key😂i'm comming!...thx for sharing 👍
WoW ,now thats what i call a, X-Rated nixie clock..Impressed👍
Looks great Mate.Keep it up👍
Very impressive!
Complete with WWV in the background.. Awesome Job .
very cool video. keep it up man
Well done you. Are the thumbwheels and keypad used for setting the time or alarms etc.? Kind regards, Terry
The thumbwheels are used for setting. The smaller clock is much simpler. It only has 17 ICs total. It uses (6) of the 74HC160 synchronous counters. In an effort to minimize complexity and parts count, the thumbwheels also serve as the number loaded on the next clockpulse after either 23:59:59 (for 24 hour mode), or 12:59:59 in 12 hour mode. As seen in the video, it is operating in 24 hour mode, so the thumbwheels must be left at 0000 so that it goes to that at midnight. If it was in 12 hour mode, the thumbwheels need to be set to 0100 to make it work correctly. When ever this clock gets set, those wheels must be returned to those values otherwise timekeeping won't work. ----------------------------------------------------------------------------------------------------------------------------------------- The other larger clock uses about 42 ICs and is much more complex. It has a settable alarm. The keyboard is used to set time, set alarm, turn the tubes on and off, select 12 or 24 hour mode, and keyboard also controls the seconds counter, zeroing it then holding it until time to turn it loose. When I built that one in 1994, I wanted an easily settable clock. Just punch in the numbers. Easy to set, hard to build. it is all wirewrapped. The larger older clock uses a pair of 74LS160 counters for seconds. Minutes and hours are 74LS192. Those turned out to need help resetting to values less than ten, with the aid of 74LS221 pulse maker (monostable multivibrator) to assure a reset pulse of a defined interval instead of attempting to reset on a spike. I realize now that 74LS192 is not an ideal counter to make a clock out of for this reason, but it's done long ago, works real well and so I leave it that way. The most recent effort, a clock based upon the rare 74142 counter/driver........it needs help too. had to actually add 3 more counters to "supervise" the 74142s. But that clock operates ok, and the parts count for it is 16 ics. So I actually beat my old record of fewest ICs by one IC. Those old old TTL counters are hard to reset properly on the fly to make them be modulo 6 instead of modulo 10, and then the entire modulo 24 business gets even stranger yet. But a 4024 binary counter came to the rescue there, because bits "16" and "8" are ANDed together, so it spits out a nice pulse when N=24. It needed a 74HC221 to make a solid reset pulse of 100 uS. 74142, by far not the most efficient way, but has it ever even been done before? I wonder.
@@leroyjones6958 That's Genius. Thanks so much for sharing and inspiring.
As a kid I alwas watched over the shoulder of telco workers to see what numbers they were dialing. I'd collected quite a few ANI and other special numbers that way.
Super. Wow.
When i started work back in 1968 that was the telephone exchange eqipment in use...😂 brings back memories ,thanks
Very nice. Thank You for the video.
If the bus has eight ports, does that mean you could do a time call and ANI at the same time?
Nope. I wish it did but since there is only ONE of the Digitalker units available, when ever the bus controller assigns one of the 8 ports of Digitalker, to one of the specific applications, all of the other 7 remaining ports are held in a waiting que until Digitalker is again available after the first call disconnects. It is a "first come, first served" type of arrangement. For instance it is set up so that when Digitalker is busy elsewhere and the talking clock line is called, it will not even answer the call until the bus is selected for Digitalker to be assigned to the clock. It is 8 ports, but only one at a time can be serviced. (it is expandable too by the way, if it ever needs 8 more) 😎
@@leroyjones6958 Wow, thanks for the write up! Very interesting-and such a beautiful setup you have there. Looks like a lot of fun! Please keep the videos coming! :)
How does it work? By that I mean, how does it know which line is calling it?
The diode matrix translates a "1-of-200" contact closure into an 8-bit binary number. (two hex digits). The hex line ID numbers range from 01 through C8, with 00 reserved for testing. Since there are 5 linefinders, the ANI must scan across them until it finds the one which has the call to the ANI. That happens when you hear those fast little beeps. The beeps are the ANI scanning. Once the proper linefinder is identified, then a 48 volt signal is sent to back jack pin 5 on it. That 48 volts flows through the linefinder and then out on either the A or the A1 bank wiper, which has landed upon those bank contacts which represent the line I.D. of the calling line. That signal then flows through a 200 conductor cable, over to the diode matrix, which generates the 8-bit line I.D. code, which it then sends over to the ANI on those 3 boards on the table across the room. There, that 8-bit line I.D. code then gets turned over to a 2732A EPROM which has been programmed to act as the translation table that contains all of the phone numbers associated with all 200 of the 8-bit line I.D. numbers. Those phone number digits then get passed along to Digitalker so it can be spoken and at the same time it is fed to the flashing green 7 segment readout, which shows the calling phone number one digit at a time as it gets spoken.
Nice work! Greetings from Montreal!
Thank you! It was a long hard slog. The first time it talked was really glorious. That came after 2 months of work. It has been in service in its temporary configuration now since 2015. Most of the bugs are out of it now. :)
Holy cow ! You are definitely brave to do this entirely in discrete logic. The last time I did a discrete logic design was more than 10 years ago for my first nixie clock. Since then, everything uses an FPGA, RasPi CPU, or both. BTW, my first major electronics project was in 1979 when I built an ASCII video terminal for remote timeshare access (110 baud dialup), and it was the same Radio Shack keyboard.
Thanks! Just swapped out several of the old 7400 style ICs in that RatShack keyboard. Installed a variety of CMOS ones such as HC, C, HCT, and had to settle for a few LS ones in sockets where none of the CMOS ones seem to operate correctly. But now have total keyboard current down to 90 mA, where as originally it sucked up 450 mA!
I have the same meter. 👍