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< h1 > CASIO fx - CG50 </ h1 >
< p > TBD </ p >
< h2 > Pictures </ h2 >
< p > Click images to view full size </ p >
< a href = " /res/img/calculators/casio-fx-cg50/1s.jpeg " >< img src = " /res/img/calculators/casio-fx-cg50/1s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/casio-fx-cg50/2s.jpeg " >< img src = " /res/img/calculators/casio-fx-cg50/2s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/casio-fx-cg50/3s.jpeg " >< img src = " /res/img/calculators/casio-fx-cg50/3s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/casio-fx-cg50/4s.jpeg " >< img src = " /res/img/calculators/casio-fx-cg50/4s.jpeg " width = " 15% " ></ a >
< h1 > CASIO fx - 120 ( 1977 - 78 ) </ h1 >
< p > TBD </ p >
< h2 > Specifications </ h2 >
< table class = " skami " >
< tr >
< td >< b > Size </ b ></ td >
< td > 8.4 cm x 16.2 cm x 2.4 cm </ td >
</ tr >
< tr >
< td >< b > Weight ( w / battery ) </ b ></ td >
< td > 209 g </ td >
</ tr >
< tr >
< td >< b > Type </ b ></ td >
< td > Scientific </ td >
</ tr >
< tr >
< td >< b > CPU </ b ></ td >
< td > Hitachi HD38111A </ td >
</ tr >
< tr >
< td >< b > Registers </ b ></ td >
< td > 2 standard < br > 1 constant < br > 4 bracket < br > 1 memory </ td >
</ tr >
< tr >
< td >< b > Features </ b ></ td >
< td >% , +/- , RV , F , Sci , a < sup > b </ sup >& frasl ; < sub > c </ sub > , Sqr , x < sup > 2 </ sup > , pi , < sup > 1 </ sup >& frasl ; < sub > x </ sub > , trig , < br > hyp , DMS - DD , log , y < sup > x </ sup > , SD , nCr , P - R , n !</ sup ></ td >
</ tr >
< tr >
< td >< b > Display </ b ></ td >
< td > 12 - digit VFD ( NEC LD8197A ) </ td >
</ tr >
</ table >
< h2 > Pictures </ h2 >
< p > Click images to view full size </ p >
< a href = " /res/img/calculators/casio-fx-120/1s.jpeg " >< img src = " /res/img/calculators/casio-fx-120/1s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/casio-fx-120/2s.jpeg " >< img src = " /res/img/calculators/casio-fx-120/2s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/casio-fx-120/3s.jpeg " >< img src = " /res/img/calculators/casio-fx-120/3s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/casio-fx-120/4s.jpeg " >< img src = " /res/img/calculators/casio-fx-120/4s.jpeg " width = " 15% " ></ a >
< h1 > CASIO fx - 82 ( 1982 - 85 ) </ h1 >
< p > TBD </ p >
< h2 > Pictures </ h2 >
< p > Click images to view full size </ p >
< a href = " /res/img/calculators/casio-fx-82/1s.jpeg " >< img src = " /res/img/calculators/casio-fx-82/1s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/casio-fx-82/2s.jpeg " >< img src = " /res/img/calculators/casio-fx-82/2s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/casio-fx-82/3s.jpeg " >< img src = " /res/img/calculators/casio-fx-82/3s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/casio-fx-82/4s.jpeg " >< img src = " /res/img/calculators/casio-fx-82/4s.jpeg " width = " 15% " ></ a >
< h1 > Texas Instruments TI - 30 ( 1976 - 90 ) </ h1 >
< p > TBD </ p >
< h2 > Pictures </ h2 >
< p > Click images to view full size </ p >
< a href = " /res/img/calculators/ti-30/1s.jpeg " >< img src = " /res/img/calculators/ti-30/1s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/ti-30/2s.jpeg " >< img src = " /res/img/calculators/ti-30/2s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/ti-30/3s.jpeg " >< img src = " /res/img/calculators/ti-30/3s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/ti-30/4s.jpeg " >< img src = " /res/img/calculators/ti-30/4s.jpeg " width = " 15% " ></ a >
< h1 > Texet 880 Executive ( 1977 - 78 ) </ h1 >
< p > The calculator measures 74.2 mm x 135 mm x 22.2 mm . It weighs 86 g without the battery installed , which is a 9 v PP3 - type battery . Rather than the usual press - stud type holder , the housing has two metal slide clips . There is also what I assume to be a sponge at one end which is supposed to aid in holding the battery in , however it appears to have gone completely hard and I will most likely replace it in the future . There 's small adaptor hole at the top, of which the input isn' t specified ( though it 's generally agreed that it' s 4.5 v centre - positive ) .</ p >
< p > The case is black & amp ; silvery colored with a thin brushed metallic front panel . The eight - digit bubble display has an absolutely < i > terrible </ i > viewing angle , which means you either have to be holding it under your coat or against your face to read it !</ p >
The keypad is particularly strange in the way that it has 3 cancel buttons , < pre > [ CE ] </ pre > , < pre > [ C ] </ pre > and < pre > [ CA ] </ pre > , while the < pre > [ CS ] </ pre > button is a Clear Sign button , < i > not </ i > another cancel ! The keys themselves are particularly stiff and you really have to push them to get them to register . Many 880 s suffered something referred to as the " pseudo fixed decimal bug " where , if you typed in < pre > 1 + 1.00 = </ pre > , it would display < pre > 2.00 </ pre > instead of the expected < pre > 2 </ pre >
< h2 > Specifications </ h2 >
< table class = " skami " >
< tr >
< td >< b > Size </ b ></ td >
< td > 7.4 cm x 13.5 cm x 2.2 cm </ td >
</ tr >
< tr >
< td >< b > Weight ( w / o battery ) </ b ></ td >
< td > 86 </ td >
</ tr >
< tr >
< td >< b > Type </ b ></ td >
< td > Arithmetic </ td >
</ tr >
< tr >
< td >< b > Logic </ b ></ td >
< td > Algebraic </ td >
</ tr >
< tr >
< td >< b > Power Source </ b ></ td >
< td > PP3 9 v </ td >
</ tr >
< tr >
< td >< b > Display </ b ></ td >
< td > 8 - digit LED </ td >
</ tr >
</ table >
< h2 > Pictures </ h2 >
< p > Click images to view full size </ p >
< a href = " /res/img/calculators/texet-880/1s.jpeg " >< img src = " /res/img/calculators/texet-880/1s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/texet-880/2s.jpeg " >< img src = " /res/img/calculators/texet-880/2s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/texet-880/3s.jpeg " >< img src = " /res/img/calculators/texet-880/3s.jpeg " width = " 15% " ></ a >
< a href = " /res/img/calculators/texet-880/4s.jpeg " >< img src = " /res/img/calculators/texet-880/4s.jpeg " width = " 15% " ></ a >
<!--< h2 > TL ; DR </ h2 >
< ul >
< li > Sponge in battery compartment has gone hard and should probably be replaced </ li >
< li > Power input is unlabelled but is widely agreed to be 4.5 v centre - positive </ li >
< lI > Uses an 8 - digit bubble display with a terrible viewing angle </ li >
< li > Has 3 cancel buttons ( < pre > [ CE ] </ pre > , < pre > [ C ] </ pre > and < pre > [ CA ] </ pre > ) </ li >
< li > Has particularly stiff keys </ li >
< li > Many suffered from the " pseudo fixed decimal bug " , however mine does not </ li >
</ ul >-->
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