.BG
.FN tek4105
.TL
Tektronix Color Terminal
.CS
tek4105(ask=F, file)
.AG ask
if `TRUE',
whenever a new plot is about to be produced the message "GO?" appears
on the screen.  This allows further viewing,
making a hard copy, etc., before the screen is erased.  When ready for
plotting to proceed, simply hit carriage return.
.AG file
name of the file to which output should be sent.
This enables the characters that would have been sent to the
terminal to be caught in a file for later plotting.
By default, output is sent to the terminal.
.PP
There are various models of Tektronix
graphics terminals which are only slightly different from the 4105.
The `tek4105' device driver may work on these terminals.
.PP
On `tek4105' scopes, graphics is drawn in a "graphics area" while
interaction with the computer is carried out in the "dialog area".
When not doing graphics, the terminal is placed in ANSI mode, which allows
it to be used with a screen editor.
.PP
Refer to the 4105 Operators Manual for a description of how to execute the
following "setup commands" which set non-default options:
DAENABLE yes; FLAGGING input; BYPASSCANCEL null.
.PP
If `ask' is TRUE,
whenever a new plot is about to be produced the message "GO?" appears
on the screen.  This allows further viewing,
making a hard copy, etc., before the screen is erased.  When ready for
plotting to proceed, simply hit carriage return.
.PP
When graphic input (`identify', `locator') is requested from this
terminal, the cursor lines appear horizontally and vertically across
the entire screen.  Adjust the lines to intersect at the desired point, and then 
type any single character.
A carriage return alone will terminate graphic input
without transmitting the point.
.PP
Colors 0 to 7 default to black, white, red, green, blue, cyan, magenta,
and yellow.
Area fills may be done with colors -7 to 0 (solid fill) or
1 to 16, 50 to 174 (patterned).
Character size, rotation, and line type may be changed.
Characters may appear in sizes 1, 2, or 3, with rotation
in multiples of 90 degrees.
There are 8 line types (1 through 8) giving solid, dotted, dot dash,
short dash, long dash, dash 3-dot, long dash dot, and dash space.
.PP
A device must be specified before any graphics functions can be used.
.KW device
.WR
