Diehl alphatronic calculator (1973) magnetic cards part 1

I found on ebay some magnetic stripe paper cards, 5x18.8 cm looking like this


I was curious for what machines they were and soon found it: Robotron K1000 desktop calculator series (K1002+3). More about that in upcoming thread part 2.

I first found Diehl alphatronic. (Diehl and the alphatronic brand was sold to Triumph-Adler in 1978).
The first German programmable calculator was the Diehl combitron (1966).
The alphatronic was green and had 160 registers for 1600 instructions.
https://www.calcuseum.com/scrapbook/BITMAP/BONUS/16343/_SMD16343_XL.jpg
Someone can attach many different peripherals (4 at a time):
2 magnetic tape cassettes
2 magnetic card devices
1 mark sense card reader
2 typewriters
2 floppy disks 8"
2 ROM cartridges for maths or stats
paper tape reader
and a plotter
(see the brochure here)
https://www.calcuseum.com/scrapbook/BONUS/16343/1.htm
The certatronic was enhanced and orange (1974). The alphatronic DS 200/300/400 were grey. All with green, grey and white keys.
One photo with a DS400 + 8" Floppy is on pinterest. Hi-res photos of inside and ROM modules are on catawiki.
A photo of a magnetic card reader is on the brochure, card inserted vertically. I found a tiny photo with a card inserted horiziontally, but I think that is the mark sense reader.
https://datenbank.iser.fau.de/sucheAnzeigen.php?q=I1152&h=

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