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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#2
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"DoN. Nichols" wrote: I had a keyboard (originally from a Tektronix Silent-700 terminal Texas Instruments made the Silent-700 line of terminals. I think I still have one around here. -- You can't have a sense of humor, if you have no sense. |
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Ok - I took delivery from dear Dad of my Freshman and Sophomore year in
High School - my 900 gate Game system - plays NIM against you on a light display (15 bulbs) and a switch button box as the control box. Each gate is a potted RTL gate that is RAD hard and still works. I'm fixing it up and checking it out - maybe I can get it into some history place. Game machine like that in the early 60's. It was a 3th generation with me. Switches, tubes, RTL logic. Martin On 2/15/2012 12:14 AM, Michael A. Terrell wrote: "DoN. Nichols" wrote: I had a keyboard (originally from a Tektronix Silent-700 terminal Texas Instruments made the Silent-700 line of terminals. I think I still have one around here. |
#4
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Martin Eastburn wrote: Ok - I took delivery from dear Dad of my Freshman and Sophomore year in High School - my 900 gate Game system - plays NIM against you on a light display (15 bulbs) and a switch button box as the control box. Each gate is a potted RTL gate that is RAD hard and still works. I'm fixing it up and checking it out - maybe I can get it into some history place. Game machine like that in the early 60's. It was a 3th generation with me. Switches, tubes, RTL logic. I still have a few new RTL ICs. Some are early flatpak, and were surplus made for NASA. Others are DIP left over from trying to repair a Philco Seirra Frequency Selective Voltmeter. I needed two types I never did find. -- You can't have a sense of humor, if you have no sense. |
#5
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On 2/15/2012 11:05 PM, Michael A. Terrell wrote:
Martin Eastburn wrote: Ok - I took delivery from dear Dad of my Freshman and Sophomore year in High School - my 900 gate Game system - plays NIM against you on a light display (15 bulbs) and a switch button box as the control box. Each gate is a potted RTL gate that is RAD hard and still works. I'm fixing it up and checking it out - maybe I can get it into some history place. Game machine like that in the early 60's. It was a 3th generation with me. Switches, tubes, RTL logic. I still have a few new RTL ICs. Some are early flatpak, and were surplus made for NASA. Others are DIP left over from trying to repair a Philco Seirra Frequency Selective Voltmeter. I needed two types I never did find. I remember those days. I took one look at RTL and RAN to TTL. And never regretted it. |
#6
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On 2012-02-15, Michael A. Terrell wrote:
"DoN. Nichols" wrote: I had a keyboard (originally from a Tektronix Silent-700 terminal Texas Instruments made the Silent-700 line of terminals. I think I still have one around here. You're right. I've been working on some Tektronix 'scopes and plugins recently, and every time I start to type something electronic which starts with 'T', it comes out "Tektronix" -- even if it isn't. :-) And to add to the problems, if I tried to type the abbreviation of Texas Instruments, my spelling correction would change it to "IT". :-) Thanks for the correction. DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#7
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On 2012-02-16, Michael A. Terrell wrote:
Martin Eastburn wrote: Ok - I took delivery from dear Dad of my Freshman and Sophomore year in High School - my 900 gate Game system - plays NIM against you on a light display (15 bulbs) and a switch button box as the control box. Each gate is a potted RTL gate that is RAD hard and still works. I'm fixing it up and checking it out - maybe I can get it into some history place. Game machine like that in the early 60's. It was a 3th generation with me. Switches, tubes, RTL logic. I still have a few new RTL ICs. Some are early flatpak, and were surplus made for NASA. Others are DIP left over from trying to repair a Philco Seirra Frequency Selective Voltmeter. I needed two types I never did find. I remember when Popular Electronics gave a NIM playing computer built purely with rotary switches and lamps. :-) Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#8
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Richard wrote: I remember those days. I took one look at RTL and RAN to TTL. And never regretted it. I did a lot of work with TTL, but I've used RTL and DTL when I had to. Then there was NMOS PMOS and finally CMOS which is the most used right now. There are some interesting Silicon/Germanium high speed semiconductors being manufactured these days. -- You can't have a sense of humor, if you have no sense. |
#9
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"DoN. Nichols" wrote: On 2012-02-15, Michael A. Terrell wrote: "DoN. Nichols" wrote: I had a keyboard (originally from a Tektronix Silent-700 terminal Texas Instruments made the Silent-700 line of terminals. I think I still have one around here. You're right. I've been working on some Tektronix 'scopes and plugins recently, and every time I start to type something electronic which starts with 'T', it comes out "Tektronix" -- even if it isn't. :-) And to add to the problems, if I tried to type the abbreviation of Texas Instruments, my spelling correction would change it to "IT". :-) Thanks for the correction. No problem. I knew that you knew who really made it. -- You can't have a sense of humor, if you have no sense. |
#10
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"DoN. Nichols" wrote: On 2012-02-16, Michael A. Terrell wrote: Martin Eastburn wrote: Ok - I took delivery from dear Dad of my Freshman and Sophomore year in High School - my 900 gate Game system - plays NIM against you on a light display (15 bulbs) and a switch button box as the control box. Each gate is a potted RTL gate that is RAD hard and still works. I'm fixing it up and checking it out - maybe I can get it into some history place. Game machine like that in the early 60's. It was a 3th generation with me. Switches, tubes, RTL logic. I still have a few new RTL ICs. Some are early flatpak, and were surplus made for NASA. Others are DIP left over from trying to repair a Philco Seirra Frequency Selective Voltmeter. I needed two types I never did find. I remember when Popular Electronics gave a NIM playing computer built purely with rotary switches and lamps. :-) How about their 'calculator' built with NE2 ring counters, and 'programmed' with a rotary switch and a telephone dial? -- You can't have a sense of humor, if you have no sense. |
#11
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On Wed, 15 Feb 2012 22:35:38 -0600, Martin Eastburn
wrote: Ok - I took delivery from dear Dad of my Freshman and Sophomore year in High School - my 900 gate Game system - plays NIM against you on a light display (15 bulbs) and a switch button box as the control box. Each gate is a potted RTL gate that is RAD hard and still works. I'm fixing it up and checking it out - maybe I can get it into some history place. Game machine like that in the early 60's. Sounds like a fun project. What's NIM? It was a 3th generation with me. Switches, tubes, RTL logic. And, um, what's "threeth"? -- Fear not those who argue but those who dodge. -- Marie Ebner von Eschenbach |
#12
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On 2012-02-16, Michael A. Terrell wrote:
"DoN. Nichols" wrote: On 2012-02-16, Michael A. Terrell wrote: [ ... ] I still have a few new RTL ICs. Some are early flatpak, and were surplus made for NASA. Others are DIP left over from trying to repair a Philco Seirra Frequency Selective Voltmeter. I needed two types I never did find. I remember when Popular Electronics gave a NIM playing computer built purely with rotary switches and lamps. :-) How about their 'calculator' built with NE2 ring counters, and 'programmed' with a rotary switch and a telephone dial? Hmm ... I seem to have missed that one. Perhaps when I moved and it was a while before I could find a place to buy new issues? Any idea when that one appeared? It sounds like fun. Come to think if it -- with the proliferation of LEDs, does anyone still make and sell NE2s? Last I've seen them has been in AC power switches in power fanout boxes for home computers, in generally blinking or not even that as the lamps age. :-) Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#13
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"DoN. Nichols" wrote: Michael A. Terrell wrote: How about their 'calculator' built with NE2 ring counters, and 'programmed' with a rotary switch and a telephone dial? Hmm ... I seem to have missed that one. Perhaps when I moved and it was a while before I could find a place to buy new issues? Any idea when that one appeared? It sounds like fun. '67 to '70, while I was in high school. Come to think if it -- with the proliferation of LEDs, does anyone still make and sell NE2s? Last I've seen them has been in AC power switches in power fanout boxes for home computers, in generally blinking or not even that as the lamps age. :-) \ You can buy bags of 100 on Ebay, and I think Mouser still sells them. -- You can't have a sense of humor, if you have no sense. |
#14
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On 2012-02-17, Michael A. Terrell wrote:
"DoN. Nichols" wrote: Michael A. Terrell wrote: How about their 'calculator' built with NE2 ring counters, and 'programmed' with a rotary switch and a telephone dial? Hmm ... I seem to have missed that one. Perhaps when I moved and it was a while before I could find a place to buy new issues? Any idea when that one appeared? It sounds like fun. '67 to '70, while I was in high school. O.K. I was working by then, in electronics, and did not bother with Popular Electronics by then. Instead, the industrial mags available at work were more fun for me -- including the ad for a company to do assembly work for your company. They pulled the nicest looking receptionist from the front desk and posed here with a Ungar soldering iron -- the kind with the screw-in ceramic heating elements. And had her posed holding it by the ceramic, not the cork grip a little farther back on the handle. Based on the serenity of her expression, it was clear that the other end of the iron's cord was *not* plugged in. :-) Come to think if it -- with the proliferation of LEDs, does anyone still make and sell NE2s? Last I've seen them has been in AC power switches in power fanout boxes for home computers, in generally blinking or not even that as the lamps age. :-) \ You can buy bags of 100 on Ebay, and I think Mouser still sells them. Hmm ... 100 of those, and 100 caps and resistors and a diode and other cap of the right size, and you could have a nice "old computer" front panel simulator. :-) Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#15
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"DoN. Nichols" wrote: Michael A. Terrell wrote: '67 to '70, while I was in high school. O.K. I was working by then, in electronics, and did not bother with Popular Electronics by then. Instead, the industrial mags available at work were more fun for me -- including the ad for a company to do assembly work for your company. They pulled the nicest looking receptionist from the front desk and posed here with a Ungar soldering iron -- the kind with the screw-in ceramic heating elements. And had her posed holding it by the ceramic, not the cork grip a little farther back on the handle. Based on the serenity of her expression, it was clear that the other end of the iron's cord was *not* plugged in. :-) That, or she really was a blonde. ;-) You can buy bags of 100 on Ebay, and I think Mouser still sells them. Hmm ... 100 of those, and 100 caps and resistors and a diode and other cap of the right size, and you could have a nice "old computer" front panel simulator. :-) Orget creative with thin plexiglass and make your own 'Nixie' style displays y edgeligting the individual layers. ;-) -- You can't have a sense of humor, if you have no sense. |
#16
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On 2012-02-18, Michael A. Terrell wrote:
"DoN. Nichols" wrote: [ ... Ne-2 lamps ... ] Hmm ... 100 of those, and 100 caps and resistors and a diode and other cap of the right size, and you could have a nice "old computer" front panel simulator. :-) Orget creative with thin plexiglass and make your own 'Nixie' style displays y edgeligting the individual layers. ;-) Hmm ... you know that a commercial product had that. The Non-Linear System's digital voltmeters used a series of stepper motors to implement a Kelvi-Varley divider. Four digits, IIRC. Really noisy with the sound-deadening cover off for test or repair. :-) However -- they needed a lot more illlumination than a NE-2 could create. They used the little flanged incandescent lamps of the 327 series. (I forget what the actual number was. 327 was 28V IIRC, and 328 was 6V. They were common in aircraft indicators and such.) Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#17
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"DoN. Nichols" wrote: On 2012-02-18, Michael A. Terrell ? wrote: ? ? "DoN. Nichols" wrote: [ ... Ne-2 lamps ... ] ?? Hmm ... 100 of those, and 100 caps and resistors and a diode and ?? other cap of the right size, and you could have a nice "old computer" ?? front panel simulator. :-) ? ? ? Orget creative with thin plexiglass and make your own 'Nixie' style ? displays y edgeligting the individual layers. ;-) Hmm ... you know that a commercial product had that. The Non-Linear System's digital voltmeters used a series of stepper motors to implement a Kelvi-Varley divider. Four digits, IIRC. Really noisy with the sound-deadening cover off for test or repair. :-) Today, you could use a couple rectangular LEDs per segment. You could even change the color for out of range conditions. However -- they needed a lot more illlumination than a NE-2 could create. They used the little flanged incandescent lamps of the 327 series. (I forget what the actual number was. 327 was 28V IIRC, and 328 was 6V. They were common in aircraft indicators and such.) And in legended indicator switches. I still have a few of both types as spares. -- You can't have a sense of humor, if you have no sense. |
#18
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On Feb 16, 11:13*pm, "DoN. Nichols" wrote:
* * * * Come to think if it -- with the proliferation of LEDs, does anyone still make and sell NE2s? *Last I've seen them has been in AC power switches in power fanout boxes for home computers, in generally blinking or not even that as the lamps age. :-) * * * * Enjoy, * * * * * * * * DoN. Chicago Miniature http://www.chml.com/products/pdf/5-4.pdf Several flavors in stock at Mouser. Now I have to wonder why it is that whenever I do a new design, at least one part goes obsolete before the design is finished. But I can still buy NE2s by the thousands? |
#19
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On 2012-02-19, Michael A. Terrell wrote:
"DoN. Nichols" wrote: On 2012-02-18, Michael A. Terrell ? wrote: ? ? "DoN. Nichols" wrote: [ ... Ne-2 lamps ... ] [ ... ] Hmm ... you know that a commercial product had that. The Non-Linear System's digital voltmeters used a series of stepper motors to implement a Kelvi-Varley divider. Four digits, IIRC. Really noisy with the sound-deadening cover off for test or repair. :-) Today, you could use a couple rectangular LEDs per segment. You could even change the color for out of range conditions. Yes, those would be pretty good. Of course, they would be *much* more expensive to make than the off-the-shelf 7-segment LED readouts. (There was a *lot* of precision machining in that NLS readout assembly. :-) However -- they needed a lot more illumination than a NE-2 could create. They used the little flanged incandescent lamps of the 327 series. (I forget what the actual number was. 327 was 28V IIRC, and 328 was 6V. They were common in aircraft indicators and such.) And in legended indicator switches. I still have a few of both types as spares. Indeed so, as do I. Lovely little things. What would be nice would be to get LEDs in the same package -- ideally with a built-in bridge rectifier to make them happy with AC power. :-) Should last a *lot* longer than the same lamps in a vibrating environment like an aircraft cockpit. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#20
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"DoN. Nichols" wrote: On 2012-02-19, Michael A. Terrell wrote: "DoN. Nichols" wrote: On 2012-02-18, Michael A. Terrell ? wrote: ? ? "DoN. Nichols" wrote: [ ... Ne-2 lamps ... ] [ ... ] Hmm ... you know that a commercial product had that. The Non-Linear System's digital voltmeters used a series of stepper motors to implement a Kelvi-Varley divider. Four digits, IIRC. Really noisy with the sound-deadening cover off for test or repair. :-) Today, you could use a couple rectangular LEDs per segment. You could even change the color for out of range conditions. Yes, those would be pretty good. Of course, they would be *much* more expensive to make than the off-the-shelf 7-segment LED readouts. (There was a *lot* of precision machining in that NLS readout assembly. :-) Which would be easy with a CNC machine. Can you imagine the problems NCR had making their mechanical cash registers without CNC? However -- they needed a lot more illumination than a NE-2 could create. They used the little flanged incandescent lamps of the 327 series. (I forget what the actual number was. 327 was 28V IIRC, and 328 was 6V. They were common in aircraft indicators and such.) And in legended indicator switches. I still have a few of both types as spares. Indeed so, as do I. Lovely little things. What would be nice would be to get LEDs in the same package -- ideally with a built-in bridge rectifier to make them happy with AC power. :-) Should last a *lot* longer than the same lamps in a vibrating environment like an aircraft cockpit. LED replacements have been available for over 20 years, but they are even more expensive than the lamps they replace. -- You can't have a sense of humor, if you have no sense. |
#21
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On 02/14/2012 10:14 PM, Michael A. Terrell wrote:
"DoN. Nichols" wrote: I had a keyboard (originally from a Tektronix Silent-700 terminal Texas Instruments made the Silent-700 line of terminals. I think I still have one around here. I have 2 rolls of paper for Silent-700, still in the black plastic bags. -- Gary A. Gorgen | "From ideas to PRODUCTS" | Tunxis Design Inc. | Cupertino, Ca. 95014 |
#22
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"Gary A. Gorgen" wrote: On 02/14/2012 10:14 PM, Michael A. Terrell wrote: "DoN. Nichols" wrote: I had a keyboard (originally from a Tektronix Silent-700 terminal Texas Instruments made the Silent-700 line of terminals. I think I still have one around here. I have 2 rolls of paper for Silent-700, still in the black plastic bags. I had a whole case, but I think it was in the warehouse I lost when I got sick. I bet someone would buy that paper on Ebay. -- You can't have a sense of humor, if you have no sense. |
#23
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On 2012-02-20, Michael A. Terrell wrote:
"DoN. Nichols" wrote: On 2012-02-19, Michael A. Terrell wrote: "DoN. Nichols" wrote: [ ... ] Non-Linear System's digital voltmeters used a series of stepper motors to implement a Kelvi-Varley divider. Four digits, IIRC. Really noisy with the sound-deadening cover off for test or repair. :-) Today, you could use a couple rectangular LEDs per segment. You could even change the color for out of range conditions. Yes, those would be pretty good. Of course, they would be *much* more expensive to make than the off-the-shelf 7-segment LED readouts. (There was a *lot* of precision machining in that NLS readout assembly. :-) Which would be easy with a CNC machine. Can you imagine the problems NCR had making their mechanical cash registers without CNC? Indeed -- lots of custom fixturing. Actually, I think that the frame for all the Plexiglas (or Lucite) panels was likely made with a horizontal mill with a stack of cutters on it cutting all the guide slots in the sides in a single pass, then assembled to make the overall frame. [ ... ] Indeed so, as do I. Lovely little things. What would be nice would be to get LEDs in the same package -- ideally with a built-in bridge rectifier to make them happy with AC power. :-) Should last a *lot* longer than the same lamps in a vibrating environment like an aircraft cockpit. LED replacements have been available for over 20 years, but they are even more expensive than the lamps they replace. Not when you count the cost of replacing them frequently, or having a crucial indicator lamp burn out in the cockpit. (Of course, they typically had two or three lamps per indicator, so you get some warning when one lamp burns out. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#24
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On 2012-02-20, Gary A. Gorgen wrote:
On 02/14/2012 10:14 PM, Michael A. Terrell wrote: "DoN. Nichols" wrote: I had a keyboard (originally from a Tektronix Silent-700 terminal Texas Instruments made the Silent-700 line of terminals. I think I still have one around here. I have 2 rolls of paper for Silent-700, still in the black plastic bags. And what color is the paper by now? :-) Unless it was stored in a cool environment the whole time, it is likely too dark to use. :-) After all, the printing was done by flashing it with heat. That is what made it "silent" compared to the mechanical marvel which was the ASR-33 Teletype. :-) Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#25
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"DoN. Nichols" wrote: On 2012-02-20, Michael A. Terrell wrote: "DoN. Nichols" wrote: On 2012-02-19, Michael A. Terrell wrote: "DoN. Nichols" wrote: [ ... ] Non-Linear System's digital voltmeters used a series of stepper motors to implement a Kelvi-Varley divider. Four digits, IIRC. Really noisy with the sound-deadening cover off for test or repair. :-) Today, you could use a couple rectangular LEDs per segment. You could even change the color for out of range conditions. Yes, those would be pretty good. Of course, they would be *much* more expensive to make than the off-the-shelf 7-segment LED readouts. (There was a *lot* of precision machining in that NLS readout assembly. :-) Which would be easy with a CNC machine. Can you imagine the problems NCR had making their mechanical cash registers without CNC? Indeed -- lots of custom fixturing. Actually, I think that the frame for all the Plexiglas (or Lucite) panels was likely made with a horizontal mill with a stack of cutters on it cutting all the guide slots in the sides in a single pass, then assembled to make the overall frame. Their early models were brass & steel parts, wih a small glass window over the mechanical displays. LED replacements have been available for over 20 years, but they are even more expensive than the lamps they replace. Not when you count the cost of replacing them frequently, or having a crucial indicator lamp burn out in the cockpit. (Of course, they typically had two or three lamps per indicator, so you get some warning when one lamp burns out. They were $17 each, and the lamps were 85 cents. The problem is that a lot of them were used on AC, and the early LED replacements not only had to be DC, but the sockets had to be wired for the correct polarity. -- You can't have a sense of humor, if you have no sense. |
#26
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On 02/20/2012 05:52 PM, DoN. Nichols wrote:
On 2012-02-20, Gary A. wrote: On 02/14/2012 10:14 PM, Michael A. Terrell wrote: "DoN. Nichols" wrote: I had a keyboard (originally from a Tektronix Silent-700 terminal Texas Instruments made the Silent-700 line of terminals. I think I still have one around here. I have 2 rolls of paper for Silent-700, still in the black plastic bags. And what color is the paper by now? :-) Unless it was stored in a cool environment the whole time, it is likely too dark to use. :-) After all, the printing was done by flashing it with heat. That is what made it "silent" compared to the mechanical marvel which was the ASR-33 Teletype. :-) Enjoy, DoN. I'm sure they have deteriorated, by now. ( 40 yrs. ) I think the mechanical marvel is the model 35 Teletype. One of the jobs I had at Tymshare, was evaluating terminals. I had just about everything that could put characters on paper. :-) Most were preproduction or prototypes. There was a lot of strange terminals in the late 60's, early 70's. -- Gary A. Gorgen | "From ideas to PRODUCTS" | Tunxis Design Inc. | Cupertino, Ca. 95014 |
#27
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On 2012-02-21, Michael A. Terrell wrote:
"DoN. Nichols" wrote: On 2012-02-20, Michael A. Terrell wrote: "DoN. Nichols" wrote: On 2012-02-19, Michael A. Terrell wrote: "DoN. Nichols" wrote: [ ... ] Non-Linear System's digital voltmeters used a series of stepper motors to implement a Kelvi-Varley divider. Four digits, IIRC. Really noisy with the sound-deadening cover off for test or repair. :-) [ ... ] Which would be easy with a CNC machine. Can you imagine the problems NCR had making their mechanical cash registers without CNC? Indeed -- lots of custom fixturing. Actually, I think that the frame for all the Plexiglas (or Lucite) panels was likely made with a horizontal mill with a stack of cutters on it cutting all the guide slots in the sides in a single pass, then assembled to make the overall frame. Their early models were brass & steel parts, wih a small glass window over the mechanical displays. Hmm ... early being when? I first saw them back in 1960/1961 IIRC. Speaking of "mechanical displays", we had one DVM at a later date which was a servo driven Veeder-root counter which rotated the digit drums do display the position of a 10-turn pot. I forget who made those. Not very impressive, really. :-) LED replacements have been available for over 20 years, but they are even more expensive than the lamps they replace. Not when you count the cost of replacing them frequently, or having a crucial indicator lamp burn out in the cockpit. (Of course, they typically had two or three lamps per indicator, so you get some warning when one lamp burns out. They were $17 each, and the lamps were 85 cents. The problem is that a lot of them were used on AC, and the early LED replacements not only had to be DC, but the sockets had to be wired for the correct polarity. Yes -- a problem. That's why I wanted one with a built in bridge rectifier. Are those made now? O.K. A quick search finds this: http://www.martekled.com/-strse-173/midget-flange-based-LED/Detail.bok and they offer your choice of AC, positive center contact, and negative center contact. (And, your choice of colors, too.) And the price is down to $4.25 if you buy in sufficient quantities (1000). :-) Unit price is $8.95 ea, which is better than it once was, at least. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#28
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"DoN. Nichols" wrote: On 2012-02-21, Michael A. Terrell wrote: Their early models were brass & steel parts, wih a small glass window over the mechanical displays. Hmm ... early being when? I first saw them back in 1960/1961 IIRC. I'm talking about the all mechanical cash registers that were the main products of NCR. The had several large buildings in the Dayton area that were machine shops cranking out all the parts to feed their assembly plants. They started building them over 100 years ago. Speaking of "mechanical displays", we had one DVM at a later date which was a servo driven Veeder-root counter which rotated the digit drums do display the position of a 10-turn pot. I forget who made those. Not very impressive, really. :-) Sounds as bad as the old HP printer with a bunch of rubber wheels and solenoids to rotate them to the proper number to log a frequency. Yes -- a problem. That's why I wanted one with a built in bridge rectifier. Are those made now? O.K. A quick search finds this: http://www.martekled.com/-strse-173/midget-flange-based-LED/Detail.bok and they offer your choice of AC, positive center contact, and negative center contact. (And, your choice of colors, too.) And the price is down to $4.25 if you buy in sufficient quantities (1000). :-) Unit price is $8.95 ea, which is better than it once was, at least. That's a big improvement. The AC version in white would make a nice universal replacement, but colored lamps would eliminate the need for those tiny colored silicone rubber covers. I first saw the 327/328 lamps on a tour of the VOA Bethany facility while it was being upgraded from the original design. It was one tech's job to wander around the facility to test & replace bad lamps. There were over 3,000 in use, and they were still installing new equipment. -- You can't have a sense of humor, if you have no sense. |
#29
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On 2012-02-22, Michael A. Terrell wrote:
"DoN. Nichols" wrote: On 2012-02-21, Michael A. Terrell wrote: Their early models were brass & steel parts, wih a small glass window over the mechanical displays. Hmm ... early being when? I first saw them back in 1960/1961 IIRC. I'm talking about the all mechanical cash registers that were the main products of NCR. The had several large buildings in the Dayton area that were machine shops cranking out all the parts to feed their assembly plants. They started building them over 100 years ago. O.K. I thought that we were still talking about the NLS digital voltmeter readouts. :-) Speaking of "mechanical displays", we had one DVM at a later date which was a servo driven Veeder-root counter which rotated the digit drums do display the position of a 10-turn pot. I forget who made those. Not very impressive, really. :-) Sounds as bad as the old HP printer with a bunch of rubber wheels and solenoids to rotate them to the proper number to log a frequency. How about the line printers (not HP) which had a drum of letter forms rotating and a solenoid driving a hammer on the other side of the paper to drive it into the ribbon. Early ones had all the letters lined up, but tended to fail with the massive current surge when you printed a line of all '*' or all '_'. The latter, btw, made a nice "tear here" weakened point. :-) Yes -- a problem. That's why I wanted one with a built in bridge rectifier. Are those made now? O.K. A quick search finds this: http://www.martekled.com/-strse-173/midget-flange-based-LED/Detail.bok and they offer your choice of AC, positive center contact, and negative center contact. (And, your choice of colors, too.) And the price is down to $4.25 if you buy in sufficient quantities (1000). :-) Unit price is $8.95 ea, which is better than it once was, at least. That's a big improvement. The AC version in white would make a nice universal replacement, I wonder why they make the polarized DC versions? Perhaps brighter? I didn't see a clue that the AC ones cost any more -- though they *should*. :-) but colored lamps would eliminate the need for those tiny colored silicone rubber covers. The ones which tended to tear when you tried to pull them over the rim of the bulb sleeve, or when you pressed on them to eject a bad bulb. :-) Who was it -- Honeywell -- who made those switch assemblies. I know that MicroSwitch made the snap-on switch elements. I first saw the 327/328 lamps on a tour of the VOA Bethany facility while it was being upgraded from the original design. It was one tech's job to wander around the facility to test & replace bad lamps. There were over 3,000 in use, and they were still installing new equipment. With a pushbutton on each panel to light all bulbs on that panel? There were such on the flight simulator instructor's control panel which a company I worked for for a while made. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#30
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"DoN. Nichols" wrote: On 2012-02-22, Michael A. Terrell wrote: I'm talking about the all mechanical cash registers that were the main products of NCR. The had several large buildings in the Dayton area that were machine shops cranking out all the parts to feed their assembly plants. They started building them over 100 years ago. O.K. I thought that we were still talking about the NLS digital voltmeter readouts. :-) Sorry, I thought 'NCR' was enough information. Of course I grew up near there and knew some employees. How about the line printers (not HP) which had a drum of letter forms rotating and a solenoid driving a hammer on the other side of the paper to drive it into the ribbon. Early ones had all the letters lined up, but tended to fail with the massive current surge when you printed a line of all '*' or all '_'. The latter, btw, made a nice "tear here" weakened point. :-) We had a large DataProducts drum printer on the SATE for the PRC-77. It would shake the entire computer booth when it printed a line of asteriks to signal a failure. I was there one day when the engineer from Data general was doing a core dump to the printer. it didn't have a refolder, so the paper was sraying off the ceiling. ;-) Years later, I had to scrap a tractor trailer load of those printers, along with a trailer full of VAX based CAD systems that had come off lease. The owner wanted cerified destruction to keep them off the market. It made me sick to trash the uncased NTSC studio grade monitors. but the contrast said they could not be resold. A lot of small TV stations would have paid $1000 each for them, for spares. I wonder why they make the polarized DC versions? Perhaps brighter? I didn't see a clue that the AC ones cost any more -- though they *should*. :-) Probably for the anal retentive types? Also, it would allow for simple bicolor indicators, by simply inverting the polarity if two are wired in parallel. but colored lamps would eliminate the need for those tiny colored silicone rubber covers. The ones which tended to tear when you tried to pull them over the rim of the bulb sleeve, or when you pressed on them to eject a bad bulb. :-) Who was it -- Honeywell -- who made those switch assemblies. I know that MicroSwitch made the snap-on switch elements. Master Specialties. I may still have a new switch or two left. http://www.marineairsupply.com/catalogs/10_Series.pdf I first saw the 327/328 lamps on a tour of the VOA Bethany facility while it was being upgraded from the original design. It was one tech's job to wander around the facility to test & replace bad lamps. There were over 3,000 in use, and they were still installing new equipment. With a pushbutton on each panel to light all bulbs on that panel? There were such on the flight simulator instructor's control panel which a company I worked for for a while made. They used the switch itself, with the console in diagnostics mode. He would just push a switch, then pull it out with what looked like an IC extractor and replace a bad lamp, and test again. -- You can't have a sense of humor, if you have no sense. |
#31
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On Feb 18, 10:39*pm, rangerssuck wrote:
On Feb 16, 11:13*pm, "DoN. Nichols" wrote: * * * * Come to think if it -- with the proliferation of LEDs, does anyone still make and sell NE2s? *Last I've seen them has been in AC power switches in power fanout boxes for home computers, in generally blinking or not even that as the lamps age. :-) * * * * Enjoy, * * * * * * * * DoN. Chicago Miniaturehttp://www.chml.com/products/pdf/5-4.pdf Several flavors in stock at Mouser. Now I have to wonder why it is that whenever I do a new design, at least one part goes obsolete before the design is finished. But I can still buy NE2s by the thousands? Millions of power bars sold every year still have a neon indicator in them. They're cheap and they're "green", neon being basically a by- product of air liquification and fractionation. Think of how much toxic waste an LED needs to get manufactured. Stan |
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