Stanford Extended ASCII

Stanford Extended ASCII (SEASCII) is a derivation of the 7-bit ASCII character set developed at the Stanford Artificial Intelligence Laboratory (SAIL/SU-AI) in the early 1970s.[1] Not all symbols match ASCII.

Carnegie Mellon University, the Massachusetts Institute of Technology, and the University of Southern California also had their own modified versions of ASCII.[1]

Character set

Each character is given with a potential Unicode equivalent.

SEASCII[2][3][1]

	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
0_ 0	·/NUL 00B7/0000	↓ 2193	α 03B1	β 03B2	∧/^ 2227/005E	¬ 00AC	ε 03B5	π 03C0	λ 03BB	γ/HT 03B3/0009	δ/LF 03B4/000A	∫/VT 222B/000B	±/FF 00B1/000C	⊕/CR 2295/000D	∞ 221E	∂/∇/DEL 2202/2207
1_ 16	⊂ 2282	⊃ 2283	∩ 2229	∪ 222A	∀ 2200	∃ 2203	⊗ 2297	↔ 2194	_ 005F	→ 2192	~ 007E	≠ 2260	≤ 2264	≥ 2265	≡/≍ 2261/224D	∨ 2228
2_ 32	SP 0020	! 0021	" 0022	# 0023	$ 0024	% 0025	& 0026	' 0027	( 0028	) 0029	* 002A	+ 002B	, 002C	- 002D	. 002E	/ 002F
3_ 48	0 0030	1 0031	2 0032	3 0033	4 0034	5 0035	6 0036	7 0037	8 0038	9 0039	: 003A	; 003B	< 003C	= 003D	> 003E	? 003F
4_ 64	@ 0040	A 0041	B 0042	C 0043	D 0044	E 0045	F 0046	G 0047	H 0048	I 0049	J 004A	K 004B	L 004C	M 004D	N 004E	O 004F
5_ 80	P 0050	Q 0051	R 0052	S 0053	T 0054	U 0055	V 0056	W 0057	X 0058	Y 0059	Z 005A	[ 005B	\ 005C	] 005D	↑ 2191	← 2190
6_ 96	` 0060	a 0061	b 0062	c 0063	d 0064	e 0065	f 0066	g 0067	h 0068	i 0069	j 006A	k 006B	l 006C	m 006D	n 006E	o 006F
7_ 112	p 0070	q 0071	r 0072	s 0073	t 0074	u 0075	v 0076	w 0077	x 0078	y 0079	z 007A	{ 007B	| 007C	◊/altmode/esc 25CA/001B	} 007D	^/rubout/del 005E/007F

  Letter   Number   Punctuation   Symbol   Other   Undefined   Differences from ASCII

See also

• Stanford Artificial Intelligence Laboratory (SAIL/SU-AI)
• Stanford Artificial Intelligence Language (SAIL)
• Stanford/ITS character set

References

1. Beebe, Nelson H. F. (2005). "Proceedings of the Practical TEX 2005 Conference: The design of TEX and METAFONT: A retrospective" (PDF). TUGboat. Salt Lake City, Utah, USA: University of Utah, Department of Mathematics. 26 (1): 39-40. Retrieved 2017-03-07. The underscore operator in SAIL source-code assignments printed as a left arrow in the Stanford variant of ASCII, but PDP-10 sites elsewhere just saw it as a plain underscore. However, its use as the assignment operator meant that it could not be used as an extended letter to make compound names more readable, as is now common in many other programming languages. The left arrow in the Stanford variant of ASCII was not the only unusual character. (NB. Shows a table of Stanford extended ASCII following that described in RFC 698.)
2. Mock, T. (1975-07-23). "RFC 698: Telnet extended ASCII option". RFC 698. NIC #32964. Archived from the original on 2017-03-07. Retrieved 2017-03-07. (NB. Replaced by RFC 5198.)
3. Cowan, John Woldemar (1999-09-08). "Stanford Extended ASCII to Unicode". 0.1. Unicode, Inc.

Further reading

• "double bucky". Free On-line Dictionary of Computing (FOLDOC). 1994-12-07. Archived from the original on 2017-03-07. Retrieved 2017-03-07.
• Knuth, Donald Ervin (1979). TEX and METAFONT — New Directions in Typesetting. Bedford, MA, USA: Digital Press. p. 169. ISBN 0-932376-02-9. (NB. Shows a table of SEASCII differing in a few code points from that described in RFC 698.)

External links