ER-A850 (serv.man8). ERA850 880 Sharp Application Operation Manual - Sharp EPOS User Guide / Operation Manual. Page 5

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The Sharp A850 Terminal is designed primarily for the leisure and hospitality businesses.  The
terminals have PC capability using MS-DOS and can be connected to another PC using an
RS232 cable, used in stand-alone mode as a PC, or networked to other terminals.  A variety of
printers may be used in conjunction with the terminals; slip, audit, receipt, dispense, or dot
matrix.

The Sharp A850 Terminal has  a flat key  entry keyboard and up to 156 buttons may  be
configured.  There may be several keyboards defined for  different terminal functions, for
example, bar or restaurant, and  each will have its own key  position sheet.  A flexible plastic
sheet is laid over the key position sheet as protection against spillage.  The keyboard will
sound as a keystroke is registered.

The layout of the all the  buttons is controlled by definition files and  associated files such as
PLU codes of preset item buttons and payment type buttons.  A typewriter-style QWERTY
keyboard layout can be defined for file maintenance functions, or you can use a PC keyboard
connected to the terminal.

At the back of the Sharp A850 Terminal may be a customer display showing the value of each
item as it is selected.  An amount due from the  customer may also be displayed.  Where an
alteration (such as error correct) has  been entered by the operator, a negative value may be
shown.  Indicators are displayed when void item or refund buttons have been pressed or when
the sub total is displayed.

An operator display on the Sharp A850 Terminal shows information relating to the current
trading or management function.  The information may be in the form of prompts of what to do
next or lists of available choices.