ASCII is 50 years old

http://the60sat50.blogspot.fr/2013/06/monday-june-17-1963-ascii.html

by bpierre • 13 years ago

59 32 13 years ago

the60sat50.blogspot.fr

Man, it would have been nice for printing numbers in bases greater than ten (e.g. hex) if 0-9 had come right before A-Z.

js22• 13 years ago

Turns out there's a reason for their placement:

- "The digits 0–9 were arranged so they correspond to values in binary prefixed with 011, making conversion with binary-coded decimal straightforward."

- "The letter "A" was placed in position 0x41 to match the draft of the corresponding British standard."

(Source: wikipedia.)

leviself• 13 years ago

Another interesting bitwise trick: flip bit 5 to swap the case of an alphabetic letter.

kps2• 13 years ago

The 1963 standard (linked from the article, and below[1]) does a reasonable job of describing the design rationale in the appendices.

“B4.2 Base 12 Numeric Digits. For those applications requiring use of the sterling monetary system or duodecimal arithmetic, the digits 10 and 11 can replace the two graphics immediately following the digit 9.”

[1] http://www.wps.com/projects/codes/X3.4-1963/index.html

DanBC• 13 years ago

For anyone confused about pre-decimal English currency (http://gwydir.demon.co.uk/jo/units/money.htm)

4 farthings = 1 penny

48 farthings = 1 shilling

960 farthings = £1

There were farthings, half-pennies, pennies, threepences, sixpences, shillings, florins, and half-crowns.

I guess we're lucky in only having to fiddle around with dates in awkward formats.

breadbox• 13 years ago

There's a well-documented reason for the placement of (nearly) every single character in ASCII. Unfortunately, not all of the reasons are still very compelling. In fact, a distressingly large number of them have to do with the various techniques for encoding bytes on punch cards.

For the curious, I recommend the book "Coded Character Sets: History and Development" by Charles E. Mackenzie. It's an older book, and so it's about the pre-Unicode, US-centric codes. Also, most of the pages focus on the many variants of EBCDIC rather than the stabler ASCII standard. But I guarantee that it will give you a lot of historical perspective.

asmithmd1• 13 years ago

Holy $h!7 - That book is 650 pages. That is a lot of history.

JoeAltmaier• 13 years ago

Surely EBCDIC is what you're referring to?

js22• 13 years ago

I've probably consulted the ASCII(7) man page more frequently than any other, and consistently for almost two decades now.

fnordfnordfnord• 13 years ago

I'm embarrassed to admit that TIL there is a man page for ASCII. I wish I had known this years ago.

breckinloggins• 13 years ago

And on OS X at least, it gives you a path to a file. If I "cat /usr/share/misc/ascii" on Mountain Lion, I get an ASCII table (in ASCII, of course).

decklin• 13 years ago

I got tired of looking at it in my terminal, so I made this: http://man-ascii.com/

(I had forgotten until now that the Linux and BSD versions of this man page are so differently laid out! I was running Linux at the time.)

stox• 13 years ago

And the US Navy has finally decided allow use of lower case in messages.

nsns• 13 years ago

     __  __                     __     
    /\ \/\ \  __               /\ \    
    \ \ `\\ \/\_\    ___     __\ \ \   
     \ \ , ` \/\ \  /'___\ /'__`\ \ \  
      \ \ \`\ \ \ \/\ \__//\  __/\ \_\ 
       \ \_\ \_\ \_\ \____\ \____\\/\_\
        \/_/\/_/\/_/\/____/\/____/ \/_/

mililani2• 13 years ago

I can't even figure out what that is supposed to say. I'm guessing, Hiee! ????

peter_l_downs• 13 years ago

"Nice!" ?

smaili• 13 years ago

nyar• 13 years ago

And I still can't triforce

mogrim• 13 years ago

ASCII: what a disaster. As anyone who's ever had to program in any language other than English will have discovered.

angersock• 13 years ago

Pax americana, my friend.

dragonwriter• 13 years ago

ASCII: what a disaster. As anyone who's ever had to program in any language other than English will have discovered.

Isn't programming always in some language other than English?

StefanKarpinski2• 13 years ago

ASCII: the American Standard Code for Information Interchange.

Avshalom• 13 years ago

It's not that ASCII is a disaster. It the refusal to default to larger encodings for so long after it became obviously useful (that is as soon as computers stopped being one offs).

EvanAnderson• 13 years ago

Bob Bemer, often cited as the "Father of ASCII", proposed escape sequences to extend ASCII to handle larger encodings in 1960, pre-standardization. http://www.bobbemer.com/ESCAPE.HTM

Dylan16807• 13 years ago

What else would you use? The only sane format for storing text is unicode, and unicode is a superset of ASCII. Unicode also is an enormous undertaking so don't be impatient about it.

Go ahead and complain about the proliferation of 8-bit extensions of ASCII, but that's not a problem with ASCII itself.

jokoon• 13 years ago

I wish there would be other ways to encode text, even phrases.

I once put a lot of time to gather a very short list of the most used english words.

Why not encode a phrase with its grammar ?

AaronFriel• 13 years ago

Because then you could never encode real works of literature that use esoteric or non-standard grammar. Good luck encoding Huckleberry Finn with your system.

On the other hand, encoding smaller units reliably (phonemes, graphemes, whatever is appropriate) and using compression over top of that usually gets you really close to what you wanted, but with greater expressiveness. English text compresses really fantastically well, so why overthink it?

ASCII is 50 years old

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