Operating Modes - Tektronix 4010 Maintenance Manual

Dual Key Entry
Using SHIFT Key
The Shift key can be used with any
one of a number of other keys. The
ASCII-coded characters sent are
then as indicated on the upper
section of the keys as shown in Fig.
1-5. E, R, T, I, S, D, and L are
exceptions to this. The SHIFT L
key combination sends the ASCII
code for a reverse slant line. SHIFT
plus any of the following keys
sends the same character as the key
alone: E, R, T, I, S, and D; the
name on the upper portion of these
keys refers to the TTY name for
the code which is sent when the
key is used with the CTR L key.
Dual Key Entry
Using CTR L Key
The CTR L key can be used with
anyone of the alphabet keys to
change their transmitted code to
that requ i red for ASC II control
characters. The keys are shown in
Fig. 1-5, and listed in Table 1-1
along with the ASCII-coded
character that is sent when the key
is pushed while the CTRL key is
held down.
Triple Key
Entry
Certain ASCII control character
codes require that the CTRL and
SH I FT keys both be held down
before they can be transmitted in
response to pressing a third key.
The key combination and resultant
characters are as listed in Table 1-2.
OPERATING MODES
General
Normal operation of the Terminal is achieved with the
keyboard LOCAL/LINE switch at LINE position. The
following operations are then possible:
®
Transmitting - ASCII-coded data is transmitted to
the computer as entered at the keyboard.
Receiving - Alpha Mode causes alphanumeric char-
acters to be written as received; control characters are
executed as received; Terminal goes into a reduced
intensity status (Hold) after approximately 90 seconds
of inactivity; Terminal returns to View status upon
keyboard entry or upon receipt of data from the
computer. Graph Mode causes received data to be
interpreted as specific addresses for the X and Y registers
within the Terminal, resulting in moving the display unit
beam to specific positions; the basic address positions
are shown in Fig. 1-6. Control characters are executed as
received.
Installation and Operation-4010 Maintenance
TABLE 1-1
Dual Key Combinations vs ASCII Control Characters
Key
ASCII
Combination Character Comment
CTRLA SOH
CTRL B STX
CTRLC ETX
CTRL D
EOT
CTRL E (WRU) ENO WRU
=
Who are you?
CTRL F ACK
CTRLG BEL
CTRL H BS
CTRL I (TAB) HT TAB
=
Horizontal Tab
CTRLJ LF
CTRL K
VT
CTRL L (FORM) FF FORM
=
Form Feed
CTRL M CR
CTRL N SO
CTRLO SI
CTRLP
DLE
CTRLO DCl
CTRL R (TAPE)
DC2
Commonly used to start a
tape punch unit.
CTRL S (X OFF)
DC3
X OFF
=
Transmission Off.
Commonly used to stop a
tape reader unit.
CTRL T
(T;8;PE)
DC4 Commonly used to stop a
tape punch unit.
CTRL U
NAK
CTRL V SYN
CTRLW ETB
CTRLX CAN
CTRL Y EM
CTRL Z SUB
TABLE 1-2
Triple Key Combinations vs ASCII Control Characters
Key Combination
Character
CTRL SHIFT K
ESC
CTRL SHIFT L FS
CTRL SHIFT M GS
CTRL SHIFT N
RS
CTRL SHIFT
0 US
CTRL SHIFT P
NUL
1-5