Teletext separated mosaic graphics

[William_J_G Overington]

Doug Ewell wrote as follows.

> It would be great if we could converge on a solution for this that 
> would align with the guidance of UTC and Script Ad Hoc.

Well, it would. However, in my opinion that is not the best solution 
available and I hope that my proposed plane 14 solution will be 
considered please.

I have been thinking of how best to proceed and, as an encoding decision 
is unlikely to be made until at least the next meeting of the Unicode 
Technical Committee, there is the opportunity to give serious 
consideration to the matter and then any opinions formed can be put 
forward to the Unicode Technical Committee at that time.

I suggest that a way to do this is to have a plane 15 Private Use Area 
encoding available for experimentation. If people interested all use the 
same Private Use Area encoding that would possibly give as good 
experience as possible without a formal regular Unicode encoding.

I suggest that to start off that all thirty-two teletext control codes 
of the 1976 broadcast teletext specification are encoded, in the order 
that they appear in the 1976 broadcast teletext specification, from 
U+F7000 through to U+F701F.

The character names along the following pattern.

TELETEXT INFORMAL ARCHIVING ALPHANUMERICS GREEN

This all thirty-two would have a name starting with TELETEXT INFORMAL 
ARCHIVING

I appreciate that only twenty-seven were used in teletext broadcasts, 
yet for completeness I suggest encoding all thirty-two.

For the displayable glyphs, each would be two capital letters one above 
the other upon a pale. For the avoidance of doubt they are not 
superimposed one over the other. For example, for

TELETEXT INFORMAL ARCHIVING ALPHANUMERICS GREEN

the displayable glyph would be an A above a G upon a pale.

Where the original name has two words the first letter of each of the 
two words used, where the original name has only one word the first two 
letters of the word used.

Here is a link to the display of the code names. There is a facility to 
zoom-in on the display..

https://archive.org/details/broadcast_teletext_specification_1976/page/n25/mode/2up

William Overington

Friday 16 October 2020



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