Post has attachment
It's been a while since I last posted about my collection. But recently one of my students gave me a Texas Instruments TI-30 that his father was getting rid of, and I thought about taking a family picture of the classic TI calculators in my possession.

As you can see, the SR-50A was quite popular. Most of the machines on the picture were bought for one or two euros a piece, came with a pouch, and some still had their manual. If you find any of these little wonders at the bottom of a drawer, please don't trash them. Give them away (or sell them), it should be rather easy to find someone who cares.
Photo

Post has attachment
Another new acquisition: an Original Odhner model 25, made in Sweden between 1938 and 1951. My girlfriend found it in a thrift shop last week-end for 6 euros. This machine is really great, 10 pinwheels, 11 digit counter (with carry), and a 20 digit accumulator with back-transfer. There is also a little push button on the right side for one-hand clearing of the drum.

The digit display wheel of the leftmost pinwheel was stuck, so I opened the machine to fix it. I also cleaned and greased everything inside. The machine is pleasant to do maintenance on, everything comes apart nicely, but properly inserting the carriage back is challenging. The rod that handles the counter carry has to be precisely aligned otherwise the carry jams, and it also has a sliding cogwheel that is kept in place by a long screw coming diagonally through the base. This wasn't easy to figure out.

I am really happy with this one. Even if the pinwheels are sometimes a bit easy to misalign, overall the whole thing operates really smooth.
Photo

Post has attachment
Here comes one of the beautiful latest additions to my collection: an Astra, produced by Astrawerke in Germany in 1922. But I think this particular model is probably a bit more recent, it has a crank lock lever not present in the original model. This is a Dalton-style adding/printing machine. I also got an invoice for when the machine was sold second hand in 1956 for 1400 Belgian francs. With inflation taken into account that would be around 150 euros today.

This calculator was given to me by one of my students, who found it in her grandmother's attic. The machine is in perfect working state, and in very good shape. Only the printing head cover is missing.
Photo

Post has attachment
Today I went across the nearby French border to visit a large flea market in Vieux-Reng. There, I found this wonderful Lagomarsino Numeria Model 5905 (from around 1965) for 5 euros. A few keys are currently stuck, and everything is not springing back into place as fast as it should, but the machine is in really good condition, and is only short of some good cleaning and greasing to operate fine.
Photo

Post has attachment
I am slowly going through my recent acquisitions, I literally have a heap of old calculators to photograph and register.

So here is a mysterious Condor 1212PDS, which is apparently identical to a BMC 1212PDS. The machine has a date tag from 1977 and has been made in Japan, but that's all I know about it. I paid 3 euros for it and the overall state is really good, except for the rod that holds the paper roll that is missing and has been replaced by an old radio antenna.
Photo

Post has attachment
Purchased a few weeks ago for 2 euros, a Qualitron Quali 407 from 1975. Typical LED bubble display, runs on 4 AA batteries.
Photo

Post has attachment
Found only one calculator today, a Hewlett Packard 28S from 1988. Not really what I'd call vintage, but one euro for a nice machine in such perfect condition was a good deal.
Photo

Post has attachment
Bonus video: https://youtu.be/Me67hIxvY3s

Great find from yesterday, an Olivetti Multisumma 20 from 1964. I only paid one euro for it, but the machine was really dirty and pretty much every key was acting funny. It took me a few hours to take the machine apart, clean and grease everything, and get it back "close enough" to working order.

Fun fact: damaged wiring in the power plug caused some electrical interference that would repeatedly turn on my coffee machine next door... Also, in the picture below you can see the machine before cleaning (left) and after (right), but the keypad plate looks worse because the paint is peeling apart. Fixing this will be for later.

In the video you can see the machine perform an automatic multiplication, which was an important feature of this model. The ink ribbons are dry and barely leave a mark on the paper, and a few digits are still acting up in the accumulator so the totals are still wrong, but the computation proceeds properly. Finally getting it to run this routine repeatedly without jamming was a nice reward for my few hours of work.
Photo

Post has attachment
Really nice flea market today, lots of people and nice weather. I found the following machines, for which I only paid one euro (each):

- Texas Instruments TI Programmable 57 (1977)
- Texas Instruments SR-50A (1975)
- Sharp ELSI MATE EL-203 (1977)
- Magic-Brain Calculator (1962)

The oddball of the group is the EL-203, which runs on a 9v battery.
Photo
Photo
2015-08-23
2 Photos - View album

Post has attachment
Two recent additions to my collection:

- Facit 1114 from 1972 (flea market, 3 euros)
- Hitachi KK621 from 1973 (gift from a friend)

The Facit works fine, but the Hitachi has all its VFD segments turned on.
Photo
Photo
2015-08-16
2 Photos - View album
Wait while more posts are being loaded