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@node Display Output, Strings, Compiling, Top
@chapter Display Output
@cindex display output
@menu
* Elementary Display I/O::
* Display Highlighting::
@end menu
@node Elementary Display I/O, Display Highlighting, Display Output, Display Output
@section Elementary Display I/O
@cindex display
ANS-Forth defines the following primitives words for input and output:
@ftable @samp
@item KEY ( --- char )
waits for a character typed on the keyboard and returns that character.
@samp{KEY} doesn't return on non-character input events like function
keys pressed. See @samp{EKEY} for a more complete keyboard query. [core]
@item KEY? ( --- flag )
returns true if a key is available for reading using @samp{KEY}, false
if no key is available. Eventually pressed function keys are not
detected but discarded. [facility]
@item EMIT ( char --- )
displays the character at the current cursor position. The effect of
control characters depends on the system. [core]
On UNIX systems @samp{EMIT}-ting the code decimal 10, line feed, has the
effect of both carriage return and line feed.
@item TYPE ( c-addr u --- )
displays the string of u characters starting at c-addr. [core]
@item AT-XY ( u1 u2 --- )
positions the cursor to column u1, row u2. [facility]
@end ftable
@node Display Highlighting, , Elementary Display I/O, Display Output
@section Highlighting
@cindex highlighting
@cindex screen control
@b{pfe}
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