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? single char wildcard, not at start
* multi char wildcard, not at start
(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*
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This article describes a system for switching between the display of special, normally non-display, characters and the substitution of a blank or other special character in their stead.
English (United States)
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Display With Optional Character Substitution
This article describes a system for switching between the display of special,
normally non-display, characters and the substitution of a blank or other special
character in their stead.
In text editing systems, various special codes occur in the data stream to
indicate, for example, variable space (i.e., changeable for line justification
purposes), fixed space, tab, etc. Normally, it is desired that these editing control
codes be invisible on the display, or that they be simplified in the display so as to
not distract from readability of the text. However, there are other times when the
operator needs to know the exact nature of the editing codes in the data stream.
In the figure, the data stream on line 10 from the refresh buffer of a CRT
display may contain editing or other control codes 12, 14, 16 which are normally
not displayed. In their stead, the normal display would show a blank character
code 18 or some other common substitute code such as for a simple mark
indicating that one of the set of editing codes 12, 14, 16 occurs at that point.
Common code 18 is resident in register 18R. Editing codes 12, 14, 16 are
resident in registers 12R, 14R and 16R as well as occurring in the data stream
on line 10.
A select line 20 is provided by which the operator can switch between the
display of the editing codes 12, 14, 16 or the common substitute code 18. When
one of the editing codes is encountered in the data stream 10,...