Precision, Input mode
||Scientific, 8 BCD digits, exponent
||1 storage register, not permanent
||8 digit 7 segment
black&white LCD plus sign
and memory indicator
||Manufactured in the GDR (former
East Germany) by
VEB Mikroelektronik "Wilhelm Pieck", Mühlhausen.
MR601: Original pricing 400 DM (approx. 200 Euro), introduced around
SR1: Original pricing 123 DM (approx. 61 Euro), introduced around 1985.
||3x small button sized cells
||Length 13.2cm, Width 7cm, Height 1cm
Elektronischer Taschenrechner für Technik und
Wissenschaft MR609/MR412 (German, 48 pages, includes a scan
of the MR609 warranty certificate dated 30.4.1987 and a list of
East-German repair centers)
German Diploma thesis about calculators and minicomputers in former East Germany: "Kleincomputer in der DDR"
by Tom Schnabel (follow the link "Einsatzgebiete" and "Der Einsatz der
Taschenrechner" to get to the article about the MR609/SR1).
||From 1979 to 1984 the MR609 was
used in a field
trial in 24 schools in the GDR. The tests were successful and
calculators were introduced at schools starting 1985/1986 using the
"SR1". It was technically identical to the MR609. However, its
subsidized price made it more
"RFT" stands for Radio- und Fernseh-Technik (Radio and Television