a symbol of computer-world in the early 80s, "Pocket computer" for iPhone/iPad !
DPC-100 reference manual
http://www.detune.co.jp/dpc100_reference/index.html
*"DETUNE" on DPC-100s upper-left links it.
-many mathematical functions support
-direct mathematical formula entry
-BASIC programming
-load/save and exchange user programs
-good old days "Pocket computer" traditional design