Amiga ANSI escape code spec

h0ffman · 01 July 2024, 20:15

I'm looking for an Amiga ANSI escape code spec. The one I found here doesn't seem to match what I'm seeing in actual ANSI art files.

For example the link say the following...

Select color 1 = 9B 33 31 6D

But in the file I'm looking at it's..

1B 5B 33 31 6D

Any idea why these are different?

paraj · 01 July 2024, 20:46

Isn't it just because that documentation is assuming you'll be using a specific scripting language (AREXX?) that has a shorthand way of specifying escape sequences?

"Real" escape sequences always start with ESC ('1B' - sometimes rendered as ^[ like ^C is '03' with the hat meaning "control key", i.e. ^A = 1, ^G = 7 (bell), ... , ^[ = 27 ). And that's what AmigaDOS interprets.

'1B 5B 33 31 6D' would be "^[[31m" or "ESC[31m" which according to this (http://www.bambi-amiga.co.uk/aos39_m...k-main114.html) is "Turns on text color1 (shadow, default black)."

Not an ANSI expert, and don't know what's standard, but hopefully should give a starting point.

alkis · 01 July 2024, 20:59

I think 0x9b is interchangeable with 0x1b 0x5b
This is called CSI (Control Sequence Introducer) and it has 2 represenations
- 1 byte (0x9b) or
- 2 bytes (0x1b 0x5b)

I would assume that the 2 byte sequence came first (in a 7-bit ascii era) and then later the one byte as a optimisation (?)

thomas · 01 July 2024, 21:50

RTFM?
http://amigadev.elowar.com/read/ADCD.../node008C.html
http://amigadev.elowar.com/read/ADCD.../node0508.html

01 July 2024, 20:15	#1
h0ffman Registered User Join Date: Aug 2008 Location: Salisbury Posts: 771	Amiga ANSI escape code spec I'm looking for an Amiga ANSI escape code spec. The one I found here doesn't seem to match what I'm seeing in actual ANSI art files. For example the link say the following... Select color 1 = 9B 33 31 6D But in the file I'm looking at it's.. 1B 5B 33 31 6D Any idea why these are different?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Amiga ANSI Art - What is this style?	OddbOd	Nostalgia & memories	19	15 May 2023 23:08
ANSI control-code (?) bug in "all" AsmOne versions under Kick 2.0+	Photon	support.WinUAE	4	17 July 2011 19:29
Amiga ANSi art on Windows	Crashdisk	request.Apps	1	26 January 2011 22:02
Quick spec check for Amiga O/S's	Macca	Amiga scene	5	01 May 2008 09:55
Military spec Amiga 500	Pyromania	Amiga scene	17	02 September 2004 21:50

01 July 2024, 20:46	#2
paraj Registered User Join Date: Feb 2017 Location: Denmark Posts: 1,228	Isn't it just because that documentation is assuming you'll be using a specific scripting language (AREXX?) that has a shorthand way of specifying escape sequences? "Real" escape sequences always start with ESC ('1B' - sometimes rendered as ^[ like ^C is '03' with the hat meaning "control key", i.e. ^A = 1, ^G = 7 (bell), ... , ^[ = 27 ). And that's what AmigaDOS interprets. '1B 5B 33 31 6D' would be "^[[31m" or "ESC[31m" which according to this (http://www.bambi-amiga.co.uk/aos39_m...k-main114.html) is "Turns on text color1 (shadow, default black)." Not an ANSI expert, and don't know what's standard, but hopefully should give a starting point.

01 July 2024, 20:59	#3
alkis Registered User Join Date: Dec 2010 Location: Athens/Greece Age: 53 Posts: 725	I think 0x9b is interchangeable with 0x1b 0x5b This is called CSI (Control Sequence Introducer) and it has 2 represenations - 1 byte (0x9b) or - 2 bytes (0x1b 0x5b) I would assume that the 2 byte sequence came first (in a 7-bit ascii era) and then later the one byte as a optimisation (?)

01 July 2024, 21:50	#4
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 7,033	RTFM? http://amigadev.elowar.com/read/ADCD.../node008C.html http://amigadev.elowar.com/read/ADCD.../node0508.html

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)