[GreenKeys] Teletype ASR33 - approximate date of introduction: 1963

[gil smith]

And 1963 was also the debut of ASCII -- which brings up a couple of 
questions:  Did the folks at Teletype Corp design ascii?  Was ascii 
available for the first time on the model 33?  Who were the folks involved 
on tweaking ascii to the still-used 1967 version?

ASCII-63 was mostly identical to the current ASCII-67 version. The 
definitions of the control characters (col-1) varied between the two 
versions. Also, in ASCII-63, the upper 32 positions (col-4) were undefined, 
except for three: RUB (0x7F), ACK (0x7C), and ESC (0x7E). There are 
inconsistent references to an ALT-MODE char (0x7D) in ASCII-63. In the 1967 
version, RUB became DEL and stayed in the same position,
but ACK and ESC moved into the control character area (col-1). In ASCII-67, 
^ replaced the up-arrow symbol, and _ replaced the left-arrow.

ASCII-63 and ASCII-67 are the common variants of ASCII, but there appear to 
have been some transitional versions as well: in the Teletype Model 33 
manual, there are references to a 1965 version of ASCII, that had SS in 
place of SUB (0x1A), \ for @ (0x40), ~ for \ (0x5C), an odd character in 
place of | (0x7C), and | for ~ (0x7E). A
Teletype code card for M33 and M35 machines indicates a 1966 version of 
ASCII, though the printable characters shown on the card were identical in 
all versions.

gil


At 06:52 AM 7/11/2008, wa2hwj at att.net wrote:
>There's a print ad on Ebay that dates the 33 to 1963, also. (list "teletype")
>
>Jack K0TTY
>
>NNNN
>
>
>-------------- Original message from "Bryan Brodie" 
><greenkeys at vaporland.com>: --------------
>
>
> > According to Wikipedia, it was introduced around 1963:
> >
> > http://en.wikipedia.org/wiki/ASR-33_Teletype
> >
> >
> > > ---------- Forwarded message ----------
> > > From: "Alf Fisher"
> > > To:
> > > Date: Fri, 11 Jul 2008 08:15:22 +0100
> > > Subject: [GreenKeys] Teletype ASR 33
> > > Hi all,
> > >
> > > Please can someone tell me when the Teletype ASR33 first came into 
> service?
> > >
> > > Alf
> > > G3WSD



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