Sharp EL-9900 User Manual

1 Display screen:

Displays up to 132 pixels wide by 64 pixels tall of graphs and texts.

2 Power ON/OFF key:

Turns calculator ON. To turn off the calculator, press 

@, then o.

3 Key operation keys:

These keys are used to change the key functions.

@:

Changes the cursor to “2”, and the next keystroke enters the

function or mode printed above each key in yellow.

A:

Changes the cursor to “A”, and the next keystroke enters the

alphabetical letter printed above each key in purple.

Press 

@ . to lock the specific keys in the alphabet

entering mode. (ALPHA-LOCK)

4 Graphing keys:

These keys specify settings for the graphing-related mode.

Y:

Opens the formula input screen for drawing graphs.

G:

Draws a graph based on the formulas programmed in the 

Y

window.

T:

Opens a Table based on the formulas programmed in 

Y.

W:

Sets the display ranges for the graph screen.

Z:

Changes the display range of the graph screen.

U:

Places the cursor pointer on the graph for tracing, and displays

the coordinates.

,:

Displays the substitution feature.

":

Displays both a graph and a table at the same time.

y:

Opens the table setup screen.

d:

Draws items on the graph. Use this key also to save or recall the

graph/pixel data.

f:

Sets the operations of the graph screen.

k:

Calculates specific values based on formulas programmed in
Y