Tables; Control Character Effect On Terminal - Tektronix 4010 Maintenance Manual

Characteristics-4010 Maintenance
TABLE 2-1
Control Character Effect on Terminal
ASCII TTY Effect
BEL CONTROL G A burst of 1200 hertz tone on the speaker. Makes Terminal go busy for
approximately 200 ms.
Sending a character or vector to the Terminal during the tone burst will
terminate that burst.
BS CONTROL H Backspaces one space.
Backspacing to the left of the margin will cause wraparound.
CR
RETURN or Causes carriage return by clearing X register. Clears Gin and Graph. (If the
CONTROL M crosshair is reset with CR, the resulting status of Y and Margin perform the Page
Full function. With interfaces directly connected to the CPU, it is better to clear
the cursor by sending ESC ENQ or ESC FF.)
ESC CONTROL SHIFT K First character of a special two-character sequence. (See ESC ENQ, ESC FF,
ESC ETB, ESC SUB.) ESC raises LCE (B on the Minibus) which remains high
until after the trailing edge of the next byte or activation of HOME. Does not
cause a response on TBUSY.
ESC ENQ
CONTROL SHIFT K Causes Terminal status and/or cursor position to be sent to CPU. Useful for
CONTROL E remote diagnostics, in addition to graphic uses. Local copy is not generated. See
explanation under Gin Mode.
Activates echoplex suppression. If the CSTROBE(s) generated does not cause a
CBUSY response, TC will remain in Gin Mode. This would occur if ESC ENQ
were struck while in LOCAL. Does not cause a response on TBUSY.
ESC ETB
CONTROL SHIFT K
MAKE COpy is asserted.
CONTROL W
ESC FF CONTROL SHIFT K Same as PAGE signal from keyboard. Erases screen. Resets X to O. Resets Y to
CONTROL L 1023. Y then counts down to 767 at 614 kHz. Resets Gin, Echoplex
Suppression, Margin, and Graph.
ESC SUB CONTROL SH I FT K
Clears Graph. Starts crosshair cursor (which sets Gin). Activates Echoplex
CONTROL Z Suppression (see below). Does not cause a response on TBUSY.
GS CONTROL SHIFT M Sets Terminal to Graph Mode; sets for dark vector. Does not cause a response on
TBUSY.
HT
CONTROL I Spaces one space to right.
LF CONTROLJ Y moves down one line (counts down by 22). If Y underflows, margin is
complemented and Y counts down to 767. Strap on TC- 1 can be set so that it
also causes carriage return.
SI CONTROL 0
If strap on TC-1 is set for SI-SO, selects the normal Character Set (ROM A).
Does not cause a response on TBUSY.
SO
CONTROL N If strap on TC-1 is set for SI-SO, selects the alternate character set (ROM B), if
installed. Does not cause a response on TBUSY.
US
CONTROL SHIFT 0
Clears Terminal from Graphic Display Mode.
VT
CONTROL K Y counts up by 22. If Y exceeds 767, Y will then count back down to 767.
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