The keyboard has a matrix with rows and columns. So it is possible to test the incoming signals to the outputs where places for diodes have been left open. Maybe the square root is hidden there. I once succeeded in finding the whole set of trigonometric functions which were provided in the chip but not wired to the keyboard. It was a much later version of a calculator (in 1981) with models of different complexity.
@IanScottJohnston
Жыл бұрын
That calculator puts a lot of modern ones to shame.....so many digits...🙂
@mikesradiorepair
Жыл бұрын
I have a Monroe 650 and it does have the square root key. It is between the division and subtraction keys. Other than the missing key they are the same internally. Almost identical to a Canon Canola L163 except the L163 and a % key while the 650 has better memory function. They use the exact same circuit board and to change it from a 650 to a L163 you just move a jumper that is marked L163 650.
@____________________________.x
Жыл бұрын
I noticed that lap counter thing straight away, that would be really useful for double checking I'd added up a column properly. And that RV button, the number of times I get values switched when trying to calculate £/g
@georgestephens2593
Жыл бұрын
Now I have calculator envy!
@EngineeringVignettes
Жыл бұрын
PCB: "Made in Japan" Well, everyone knows, all the best stuff is made in Japan :) Nice calculator, the keys were made to last. Cheers,
@youtuuba
Жыл бұрын
Similar in many ways to my old Canon "Canola" 161S. Same kinds of reed switches, lots of Nixies, but it is older than this one in the video....it has no LSI chips, instead it has a card rack with several large boards plugged in, all using LOTs of pre-TTL simple logic gate ICs to do everything. Because it has no solid state memory, it has an acoustic delay line (externally it looks like an old early 1980s vintage HDD) where a cycling series of 1s and 0s exist as pings or no pings on a long wire that is coiled up inside, plucked electromagnetically, and read back the same way, and strings of several numbers are constantly held in this, going around and around, modified on the fly as needed by whatever function is being done by the logic. It is kinds hard to believe that such a sophisticated calculation of large numbers, plus all the oddball extra functions and variable number of digits and such can be accomplished by just a few cards worth of discrete logic. Mine worked when I bought in on eBay, except one of the keys had a dead reed switch. I was not able to find a suitable replacement, so I just relocated it to one of the rarely used switch positions, swapping reed switches to get the more important key working again.
@rene0
Жыл бұрын
Reed switches.. This thing is made to last. Yes, it's a beauty. Let us know how restoration goes if you plan any.
@robinbrowne5419
Жыл бұрын
Wow. Awesome calculator. I have never seen one with so many digits. Good on TI and Canon. 👍 Happy New Year IMSAI Guy and kitty.
@W1RMD
Жыл бұрын
You show the coolest stuff! Thanks for sharing and Happy New Year!!
@CaptainKirk01
Жыл бұрын
So I thought Id mention this channel "Dalibor Farný" A small company that is bringing back, and also learning to manufacture really huge Nixie Tubes from scratch.
@IMSAIGuy
Жыл бұрын
My friends wife bought him one. I haven't see it yet
@CaptainKirk01
Жыл бұрын
@@IMSAIGuy Oh Please show it when you do!
@IMSAIGuy
Жыл бұрын
@@CaptainKirk01 I hear it is still not shipped. But I will try and get some video when he does get it.
@AndySpicer
Жыл бұрын
That thing must have cost a fortune in the early 70’s.
@hagopboghossian6841
Жыл бұрын
Wow, the old electronics, i like to see classic electronic products, they were made mostly in USA Japan UK Germany etc.
@pietpaaltjes7419
Жыл бұрын
It is a beauty :-) My 'old' Casio college fx-100 has a RV function. It is marked X Y with a double pointed arrow in the middle. I loved this function at school.
@rfburns5601
Жыл бұрын
Your HP calculator will show 31 or 32 digits by hitting shift > show (not shitshow). My HP42S does. The power connector looks like an XLR? Imagine the damage you could do by plugging that cord into a mixing console.
@gyrgrls
Жыл бұрын
Impressive, but the HP calculators of the day utilized RPN and featured a 7 segment LED readout. I remember being totally flabbergasted by the HP-45, circa 1973.
@IMSAIGuy
Жыл бұрын
that's the year I graduated high school and my parents bought be an HP-45
@TeslaTales59
Жыл бұрын
I think they have one of those at the Computer History Museum in San Jose. Nice machine. Nixie always look good, eh?
@vincei4252
Жыл бұрын
That's an excellent calculator. Especially like the lap feature! I have a 12 digit Sharp Compet QS-2122, sadly it's not a nixie display!
@CarlosGarcia-wu4uw
Жыл бұрын
Love the sound of the keyboard!
@TheOwlman
Жыл бұрын
Forget 22/7, use 355/113 and get six decimal places 😄
@gyrgrls
Жыл бұрын
use 1 x 3.141592653589793 ...
@TheOwlman
Жыл бұрын
@@gyrgrls Well you could, however, if your memory is bad then it is easier to do better than the 22/7 I was taught in school decades ago without much effort in memorising. After all, splitting 113355 into two three digit numbers and making the bigger one the numerator isn't a stretch, though I personally just hit the π key when it is available.
@megatesla
Жыл бұрын
13:25 Contrary to popular belief these old reed switches can oxidize on the inside or stop working for other reasons. I have had to replace some on vintage calculators. I have also had to replace faulty keyboard diodes on a Canon calculator, so you might want to check the diodes as well.
@megatesla
Жыл бұрын
3:16 The constant button usually works a bit different on vintage calculators. For example you can do 3 * 2 = 6, then press 4 = and it will do 4 * 2 and display 8, etc. Maybe you can check if the Monroe also does that in addition to just pressing = to display the last answer * 2. It should also work for division.
@IMSAIGuy
Жыл бұрын
I was able to find an instruction manual and everything does work, a bit odd, but does work
@tomran247
Жыл бұрын
Delightful!
@frankowalker4662
Жыл бұрын
A thing of beauty. :)
@open_forum_photos8273
Жыл бұрын
Leave pi on the nixie screen for 72 hours to overclock them bright!
@radarmusen
Жыл бұрын
Looks like there is a unpopulated switch and space for a reed switch.
@oldguy9051
Жыл бұрын
Yeah - and easy to test... ;-)
@papyblue2162
Жыл бұрын
Magnificent!
@arthurharrison1345
Жыл бұрын
Unless they're electrolytic or paper types, the capacitors should not be replaced.
@megatesla
Жыл бұрын
10:40 The Canon L163 uses Hitachi CD71 nixie tubes, so I would assume these are the same.
@JaenEngineering
Жыл бұрын
Maybe accumulating both nominators and denominators has something to do with fractions. For example if you calculated 1÷2 then 2÷3 then 3÷4 you'd end up with 1+2+3 (6) & 2+3+4 (9) in the accumulators. Don't know if that's useful for anything,
@__--JY-Moe--__
Жыл бұрын
10+/- e16!! I feel smarter just looking @ this!!
@jerril42
Жыл бұрын
That is a beautiful machine. What were the blue and white components in the power supply (12:04)? My guess is diodes.
@IMSAIGuy
Жыл бұрын
yes diodes. at HP we used ones the same shape but were green. We called them 'glob of snot' diodes
@jj74qformerlyjailbreak3
Жыл бұрын
My Sobax 600 has 14 nixies. I would be willing to trade it for that Heathkit scope you last repaired.
@jj74qformerlyjailbreak3
Жыл бұрын
It does Sq root. The very first to offer it.
@jj74qformerlyjailbreak3
Жыл бұрын
I can’t find any service manual. The thing is 5 slot cards fully populated with orange IICs I know nothing about.
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