IBM 1620 invalid character symbol

[John W Kennedy via Unicode]

Indeed, the later 1620-2 was equipped with a Selectric, which probably has something to do with the fact that the ж-like character was replaced on that model by the “pillow” character (which doesn’t seem to be available in Unicode at all).

> On Sep 27, 2017, at 1:02 PM, Asmus Freytag via Unicode <unicode at unicode.org> wrote:
> 
> On 9/27/2017 9:32 AM, Ken Whistler via Unicode wrote:
>> The only font on that machine can be found by feeling the key strikers in the typewriter.
> In that context it's worth remembering that there while you could say for most typewriters that "the typewriter is the font", there were noted exceptions. The IBM Selectric, for example, had exchangeable type balls which allowed both a font and / or encoding change. (Encoding understood here as association of character to key).
> 
> That technology was then only two years in the future.
> 
> Other typewriters used interchangeable type wheels for the same purpose, but I believe that generally came later.
> 
> A./

-- 
John W Kennedy
"Harriet thanked Heaven, with grim amusement, for the scholarly habit; at least, one did not have to argue about what was or was not evidence."
  -- Dorothy L. Sayers: "Gaudy Night"