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This technique provides for high speed rearrangement of text lines on a text display system without rewriting all lines of text in the memory to which the display is connected.
English (United States)
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Linking Algorithm For Display Memory
This technique provides for high speed rearrangement of text lines on a text
display system without rewriting all lines of text in the memory to which the
display is connected.
When a line of text is added or deleted to a frame of text being displayed by a
text display system, some or all lines change position on the display screen' This
rolling up or rolling down of lines is known as scrolling. If it is necessary to
move the storage locations of all lines in the display refresh memory that are
scrolled on the display screen, a relatively long time is required and the display
screen may noticeably blink.
The present technique substantially shortens the time required for scrolling
by designating a fixed refresh memory buffer length for each line, for example,
256 bytes. Each line is written into the refresh memory with a pointer which
points to the address of the beginning of the next sequential line on the screen.
The display hardware reads and follows this pointer. When a line is added or
deleted, the pointers are rewritten, as required, instead of the entire line of text.
In Fig. 1, a four-line display screen and the corresponding refresh memory
contents are shown. The pointer in parentheses at the end of each line points to
the beginning address of the following line to be displayed.
Assume now that the line EEE is to be added at the bottom of the screen so
that all other lines must be shifted up one line. In this case the...