26 Oct
2012
26 Oct
'12
4:39 p.m.
On 10/26/2012 02:37 PM, Richard wrote:
I did some terminal firmware for a customer in the early (pre-PC) 80s.
I had to refresh my memory, so I dug into my musty-smelling files and
turned up two documents that I worked from. The first is titled
"PRESENTATION LEVEL PROTOCOL VIDEOTEX STANDARD", dated May, 1981 from
Ma Bell. Unfortunately, that standard doesn't discuss multiple
character sets, so attached to it was a section from another standard
titled "Teletex Zeichenvorrat und Kodierung (basierend auf CCITT
Empfehlung S. 61)" that covers character formation (among other things)
Francois Dion <francois.dion at gmail.com>
writes:
Anybody else
dabbled in NAPLPS? (ANSI X3.110)
I remember reading about NAPLPS in BYTE at the time it came out. I
never heard of anyone that actually implemented it. The BBS dudes
went with the ANSI escape codes supported by the IBM PC and clones and
other terminal manufacturers already had their own standards like
ReGIS from DEC and Tektronix 4010/4014 graphics sequences. Only a
couple people ever supported the ReGIS coding sequence besides DEC,
IIRC. By the time it was feasible to make a cheap graphics terminal,
it was also feasible to make a cheap PC with graphics and suitable
client software that talked any protocol you wanted. from multibyte codes.
Does that count as dabbling? I think I still have the engineering
prototype PCB for the terminal wandering around... It feeds an OEM CRT
monitor kit and takes a (now missing) serial keyboard.
--Chuck