Specifications

MU.ATD-1472E
5.4.3.2.5
Grid-and-stylusdevices. The following provisions cover techniques thatusea means
of establishingan x and y grid anda stylusfor designatingspecificpointson that grid for control
purposes (e.g., time-shared x and y potential grids and a voltage-sensitive stylus),
5.4.3 .2.5.1 Armlication. Grid and stylus devices maybe used to pick off data from a CRT,
enter points on a display, generate free-drawn graphics, and similar control applications. The grid may
be on a transparent medium allowing stylus placement dimct.lyover corresponding points on
the display or it may be displaced horn the display in a mnvenient position for stylus manipulation. In
either case a follower (bug, mark, hook) shall be presented on the display at the coordinate values
selected by the stylus. Devices of this type should be used only for zero order control functions (i.e.,
displacement of the stylus from the reference position causes a proportional displacement of the
follower).
5.4.3 .2.5.2 Dynamic characteristics. Movement of the stylus in any direction on the grid
surface shall result in smooth movement of the follower in the same direction. Discrete placement of
the stylus at any point on the grid shall cause the follower to appear at the corresponding coordinates
and to remain there as long as the stylus is not moved. Reiiesh rate for the follower shall be
sufficiently high to ensure the appearance of a continuous track whenever the stylus is used for
generation of free-drawn graphics.
5.4.3 .2.5.3 Dimensions and mounting. Transparent grids which are used as display overlays
shall conform to the size of the dispiay. Grids which are dispkteed from the display should
approximate the display size and should be mounted below the display in an orientation to preserve
directional relationships to the maximum extent (i.e., a vertical
planepassing through the nort.hhouth
axis on the grid shrdJpass through or be parallel to the northhuth axis on the display).
5.4.3.2.6 Mouse (Fme-movin~ XY connller~
5.4.3 .2.6.1 Arxdkation. A mouse maybe used on any flat surface to generate x and y
coordinate values which control the position
of the foIlower on the associated display. It maybe used
for data pickoff or for entry of coordinate values. It should be used for zero order control only (i.e.,
generation of x and y outputs by the controller results in propordonal displacement of the follower). It
should not k used for generation of free-drawn graphics.
5.4.3 .2.6.2 Dvnamic cbactaistics. The characteristics of the mouse and placement of the
maneuvering surface shall allow the operator to consistently orient the mouse to within 10°of the
comet orientation without visual reference to the controller (e.g., when the operator grasps the mouse
in what seems to be the correct orientation and moves it rectilinearly along what is assumed to be
straight up they axis, then the direction of movement of the follower on the CRT shall be between 350
and NY). ~m~~ik-m~lcti~_m~a&~&&~dsW
result in smooth movement of the follower in the same direction A(P. The controller shall be opemble
witbeifberthe ie#ters@tband. Acompio@excur&m
ofdlomwlul@&um&&t&ade“ Oftbe
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or offket uniess expandd movement is selected for an automatic sequencing mode of operation. If the
controller can drive the follower off the edge of the display, indicators shall be provided to assist the
operator in bringing the follower back onto the dispiay.
5.4.3 .2.6.3 Dimensions and shape.
The mouse shall have no sharp edges but shall be shaped
toughly as a rectangular solid, with limiting dimensions as follows.
Minimum Maximum
Width (spanned by thumb to finger grasp) 40 mm (1.6 in)
70 mm (2.8 in)
1.ength
70 mm (2,8in)
120 mm {4.7in)
Thickness
?5 mm (1 Om)
4(lmm{l.hml
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