Tektronix 4010 Maintenance Manual page 25

Graph Mode. A graphic display mode which occurs upon
receipt of GS. It permits the Terminal to accept data as
addresses. Movement to the address can either be dark or
can result in drawing a vector. See Tables 2·3, 2-4, and 2-5.
Graphic Address. A combination of X and Y register
values which indicates a position on the display (X 0-1023,
Y 0-780) or off the display (Y 780-1023). Address of
bottom-left corner of display is OX, OY; address of top-right
corner of display is 1023X, 780Y. See Tables 2-4 and 2-5
for information about sending an address to the Terminal.
Graph Mode Memory. The ability of the Terminal to
remember the first three bytes of the last graphic address
when switched out of Graph Mode. The Terminal requires
receipt of only the low X byte to return to its last Graph
Mode address when switched back to Graph Mode.
Graph Mode Vector Drawing. See Table 2-4.
Hard Copy Mode. Permits copying of the Terminal
Display by a Hard Copy Unit. Applicable to 4010-1, but
not 4010. Mode is caused by READ from a Hard Copy
Unit. TBUSY holds the Terminal busy during Hard Copy
Mode. See Table 2-8.
Hold Status. A reduced intensity condition for the
display unit. It occurs if the Terminal is inactive for
approximately 90 seconds. The Terminal returns to View
Status as soon as data is received or a keyboard character is
entered.
Home Position. Top left corner of display unit in Alpha
Mode, commanded by OX,767Y. Beam moves to that
position upon initialization, and upon receiving ESC FF. It
is also arrived at by entering PAGE or RESET at the
keyboard.
Interface Specification. See documentation pertaining to
specific interface unit.
®
Characteristics-4010 Maintenance
Line, Alpha Mode. Consists of
~72
character spaces;
lines are 22 points apart (approximately 4 mm or 0.16
inch) between identical reference points. 35 lines comprise
the total display.
Line Feed. Moves writing beam down 22 points. This
equals one line in Alpha Mode. Occurs upon receipt of LF
or ESC FF. Occurs automatically when spacing past the end
of a line.
Line Length, Graphic. Maximum line lengths within the
quality display area are 18.75 cm (7.4 inch) horizontal,
14.3 cm (5.625 inch) vertical, 23.6 cm (9.29 inches)
diagonal. (Values given are within the display quality area
with the Terminal adjusted as outlined in the adjustment
procedure.)
Local Operation. Off-line operation used principally for
operator training, formatting of data, and equipment
maintenance. It is selected by the LOCAL/LINE switch at
the keyboard, and isolates the Terminal from the computer.
See Table 2-7 for details.
Margin, Horizontal. Margin
~
is located at OX; Margin 1
is located at 512X. Margins alternate automatically when
line-feeding past the 35th line. Carriage return resets the
beam to selected margin. ESC FF resets the Terminal to
Margin~.
Terminal also resets to Margin
~
in response to
PAGE or RESET keys.
Minibus. Signals available at each of the board-edge
connectors on the motherboard (except for Deflection
Amp and Storage board connector). See Dictionary of Line
Titles and Wire List in the Diagrams section for details.
Modes. Alpha (Alphanumeric), Graph (Graphic Display),
Gin (Graphic Input), Hard Copy. See specific mode
descriptions for details.
Options, Equipment. Options available for the 4010/
4010-1 at the time of this printing include the Optional
Data Communication Interface and a variety of TTY Port
Interfaces. Also see Accessories.
2-5