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Disclosed is a programming concept for combining the functions of both the IBM 3101 and Digital VT100 displays into one display routine.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
86% of the total text.
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Combined IBM 3101 and Digital VT100 Display Service
Disclosed is a programming concept for combining the functions of both the
IBM 3101 and Digital VT100 displays into one display routine.
The display functions of both IBM 3101 and Digital VT100 async terminals
were contained in one display service routine by combining functions and using
common code in the following areas: 1) Case Selection - Used case selection
conditions. Same function between emulators was mated with one function
request case condition. Later, code spread/split based on VT100 or 3101 or
both. 2) Erase End-of-Line - Affected area/length was calculated. Emulator
specifics were handled. 3) Erase End-of-Screen - Affected area/length was
calculated. Emulator specifics were handled. 4) Scrolling - One scrolling routine
was used for both to scroll forward and backwards and clearing the display. 5)
Updating Physical Display - Common computation of start point in display and
length of update. 6) Determining How Much of Display Changed - Used
minimum/maximum routine to compute start and end point for display update
when less than entire display changed. Values of variables used in routine were
key. 7) Sending Host Data - Shared code to construct escape sequence and data
buffers for transmission to host. 8) Character Updates on Display - Shared code
to update a character on display. 9) Tab Function - Shared code to search for
next tab stop. 10) Cursor Movement - shared code for cursor movement keys