IBM 1620 invalid character symbol

Philippe Verdy via Unicode unicode at
Wed Sep 27 16:08:15 CDT 2017

But it is not the case for this early computer, whose typewriter terminal
is clearly using non-interchangeable font balls but old metalic type on a
"wheel of hammers".
It's clearly also that this is not that typerwriter (described in the
munalk) that was used to typeset the manual using more conventional
typophaphic tools used by book editors.
So we can't compare what is in the manual with what was actually printed
(as described in the manual).

2017-09-27 19:02 GMT+02:00 Asmus Freytag via Unicode <unicode at>:

> 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./
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the Unicode mailing list