1. Character set assigments (Re: How do I display IBM PC characters?)
[ Added comp.os.linux.developments.system as receiver because terminal driver
is part of kernel -- right? Added comp.terminals as receiver, because that
is terminal (or terminal emulation) issue. ]
?: I'm trying to figure out how to display IBM PC characters. I know it's
?: possible, but doing a simple printf() with the value gets it masked to
?: 7-bits, and when I tried ncurses, it put the wrong character up... Any
?: pointers to more info on this?
? Before you do your printf, print this: "\033(U" and it will switch
?to the DOS character set. "\033(B" will switch back. Or vice versa.
Just a comment (and some surprising notes :-))
These ESC ( U is guite odd code in standards view as
far I understands. ESC ( assigns bank G0. And bank G0 is on accessible
in range 128-255. That is GR (right side; characters (128)160-255) can newer
point to to bank G0. Only to banks G1-G3.
It should be more understandable if code is
ESC - A Assing Latin/1 (area (128)160-255) to G1
ESC - U Assign DOS character set (area 128-255) to G1
But it isn't that way :-)
And codes 'ESC ( U', 'ESC ) U', 'ESC * U' and 'ESC + U' have already another
standard meaning (see later).
(both ESC - and ESC ) assigns G1 -- charset names are different.
Hmm. ESC - can assign areas 160-255 (32-127),
ESC ( can assign area 161-254 (33-126) -- yeas these are very confusing.)
By to way -- from where that ident "U" comes for DOS character set?
Just curious.
Oops. Letter "U" is reserved for Latin-greek-1 (iso-ir-27) according
of RFC 1345 (that is informal RFC).
RFC 1345 lists following codes:
ESC ( U Assigns iso-ir-27 to G0
ESC ) U Assigns iso-ir-27 to G1
ESC * U Assigns iso-ir-27 to G2
ESC + U Assigns iso-ir-27 to G3
RFC 1345 don't list codes
ESC - U Assign {something} (160-255 (32-127)) to G1
ESC . U Assign {something} (160-255 (32-127)) to G2
ESC / U Assign {something} (160-255 (32-127)) to G3
[ Hmm. Perhaps I comment some other issues later. ]
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