It measures 88.5 x 59.0 mm horizontally and is about 8.3 mm thick. The DM15 calculator is about the same size as a credit card. In 2011 it was released again as the HP-15c Limited Edition, which ran at a speed about 100 times faster than the original. This HP-15c was first released in 1982 and discontinued in 1989.
The DM15 Scientific calculator emulates the popular HP-15c Scientific calculator. There is also a HP9100 desktop scientific calculator from 1968 which still mostly works. I have a HP21 and a HP29C which are non-functioning. I also have a HP65, a HP32S and a HP42s which all work. It is held in place with some strips of stiff foam rubber.Ĭontacts were added and taped underneath. I replaced the original expired batteries with a suitable NiCd pack, intended for older cellphones. I am a long-time user of my HP35 scientific calculator from 1974. Other models include the DM41, DM16, DM12 and DM11 which all emulate corresponding HP versions. The DM15L has real keys and is a similar size to the original HP15c. The DM15 is a credit card size scientific calculator in a titanium shell. I purchased my DM15 and DM15L scientific calculators from SwissMicros.
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