Casio FX-190 and FX-191

Brand:	Casio.
Model:	FX-190 and FX-191.
Origin:	Japan.
Introduction:	1979.
Type:	Pocket LCD scientific and programmable calculator with LCD scale.
Functions:	4-Basic function with constant, memory and parenthesis in normal and scientific notation, Trigonometric and Logarithmic direct and inverse functions, conversion of coordinates system, statistical functions, Heron's formula. Programming capability: Up to 52 step with basic flow control (conditional and unconditional jump, pause for display/input). Scale functions: Line segment display, pitch designation, n division, log scale, decimal portion indication display, extension & reduction, scale reversal.
Display:	LCD with 8 digits and indicators. LCD scale of 15 cm (FX-190) or 6 inches (FX-191).
Keyboard:	40 keys plus On/Off switch and rotating knob for contrast control.
Size:	9.21 x 2.32 x 0.31 in, 234 x 59 x 8 mm.
Accesories:	Cardboard box and plastic softcase. User manual in English and Spanish for the FX-190.
Condition:	(8/10) Very Good, minimum marks, working.
Download:	Casio FX-190 Operation Manual in english and spanish: download.