User's Manual

Chapter 6: Tekterm Application
<BKSP> Key Behaviour In TESS
158Psion Teklogix 7530 Hand-Held Computer User Manual
6.5.5.3 < BKSP> Key Behaviour In TESS
Field mode
• In a left justified field, the <BKSP> key erases the character directly
to the left of the cursor and then moves the cursor one position to the
left. When the last character in the field is deleted, the field displays
the value that it contained before it was modified, and the field is
opened.
• In a right justified field, the <BKSP> key erases the character on
which the cursor is positioned and shifts the remaining characters to
the right by one position. When the last character in the field is
deleted, the field displays the value that it contained before it was
modified, and the field is opened.
• If the <BKSP> key is pressed when the field is empty, the 7535 emits
a keyboard error beep.
• The <BKSP> key does not delete data pre-filled by the host applica-
tion.
• If the <BKSP> key is pressed in a field that has not been modified, the
7535 emits a keyboard error beep.
• If data is entered into a field and is then deleted before the field is
completed, the field remains unmodified when the cursor leaves the
field or when the screen is transmitted.
Replace mode
• In a left justified field, the <BKSP> key erases the character on which
the cursor is positioned unless it is one position to the right of the last
character in the string; in this case, the <BKSP> key erases the char-
acter to the left of the cursor.
• In a right justified field, the <BKSP> key erases the character on
which the cursor is positioned. The remaining characters are then
shifted to the left of the cursor, and the cursor is shifted to the right by
one position.
• If the <BKSP> key is pressed while the cursor is in the right-most
character position of the field, the cursor does not shift to the left
when that character is erased; it remains in the right most position in
the field.
• When the last character in a field is erased, the field remains empty –
that is, any pre-filled data is not displayed. Pressing the <BKSP> key
in the empty field results in a keyboard error beep.
• The <BKSP> key can delete data pre-filled by the host application.
• If data is entered in a field and is then deleted before the field is com-
pleted, the field remains unmodified when the cursor leaves the field
or when the screen is transmitted.