commit 13ccc593346b8928386b97e50b90e1d3c44fed25
parent f118bb6577d6c676e643cc4fbdaaab2bc488b875
Author: Aymeric Mansoux <aymeric@bleu255.com>
Date: Tue, 14 Jun 2022 11:20:41 +0200
Merge branch 'master' of /var/www/git.bleu255.com/repos/permacomputing
Diffstat:
1 file changed, 1 insertion(+), 0 deletions(-)
diff --git a/character_terminal.mdwn b/character_terminal.mdwn
@@ -39,6 +39,7 @@ Problems:
* Some special-purpose VT terminals feature bitmap and vector graphics ("Sixel" and "ReGIS"), and some terminal emulators (xterm) actually support them. However, Sixel graphics was defined so that each individual color needs to be separately transmitted (no proper bitplanes), so it makes sense only for very low-color images.
Some technical vocabulary:
+
* ANSI X3.64 is a ~1976 control sequence standard for character-based video terminals. It was criticized for being too complicated for "dumb" hardware and thus requiring a microprocessor. One of the complications was the use of ASCII decimal numbers as command parameters (earlier terminals had used single bytes instead).
* VT100 and VT102 are physical, microprocessor-based text terminals manufactured by Digital Equipment Corporation in around 1978-1983. They became the de-facto reference implementation of the ANSI standard.
* ANSI.SYS on the [[IBM PC]] is another influential implementation of the standard. Notably, it supports the cell-specific foreground and background colors of the CGA-compatible display controllers. "Ansi art" therefore usually refers to art made for the IBM PC textmode, including the non-standard pseudographic characters featured in the IBM PC character set.
