[Simh] Simh Digest, Vol 78, Issue 8

[Larry Baker]

Appendix A of the OS/8 Handbook, "Character Codes, ASCII Character  
Set", has both 8-bit octal and 6-bit octal character codes.  I have a  
paper copy.  There may be a scanned copy online.  Let me know if you  
want me to scan the appendix from my copy.

Larry Baker
US Geological Survey
650-329-5608
baker at usgs.gov

On May 10, 2010, at 9:00 AM, simh-request at trailing-edge.com wrote:

> Date: Mon, 10 May 2010 17:02:49 +0300
> From: Sergii Kolisnyk <kolkmail at gmail.com>
> Subject: [Simh] 6-bit variants of ASCII (AKA DEC SIXBIT)
> To: simh at trailing-edge.com
> Message-ID:
> 	<AANLkTik5raDPigy1GOzABCKdYrBmu9LlgK18hlb4gvcg at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hello!
>
> Could you give me some web links to definitive manuals on DEC SIXBIT  
> codes?
> If there are none, may be somebody could take time and tell from his  
> memories
> about _different_variants_ ?
>
> I'm putting what I can find or remember here:
> http://en.wikipedia.org/wiki/Sixbit_code_pages
> I have found ECMA-1 standard (may be you know its ANSI and/or ISO  
> names?)
> http://www.ecma-international.org/publications/files/ECMA-ST-WITHDRAWN/ECMA-1,%201st%20Edition,%20March%201963.pdf
>
> ECMA-5 tells to use DEL-escaping to represent full ASCII code space:
> http://www.ecma-international.org/publications/files/ECMA-ST-WITHDRAWN/ECMA-5,%203rd%20Edition,%20June%201970.pdf
>
> I'm also wondering how it got into ISO/IEC 7811-2
> http://cardforum.cardprom.ru/standard/ISO-card-magnetic18.gif
>
> Could you correct my mistakes, if any?
> (As I remember, PDP-8 used other variant, with halves of code space
> swapped, so A got 01 code.)
>
> Thank you in advance!
>
> Best regards,
> Sergii Kolisnyk