On Tue, 20 Nov 2018 16:07:24 -0600, Tom Marchant wrote:
>>>
>>Doesn't UNPK just swap nybbles of the rightmost byte
>It does do that.
>
>>and set all other zone bits to 0 regardless of character set?
>No. It never sets the zone bits to 0.
>It sets the zone bits to F when in EBCDIC mode and to 5 when in ASCII mode.
>
5? I would have expected 3:
for ( I = 48; I <58; I++ ) printf( "%x %c\n", I, I ); }
30 0
31 1
32 2
33 3
34 4
35 5
36 6
37 7
38 8
39 9
>Don't forget ASCII was a 7-bit code. IBM was probably among the first to
>design an 8-bit extension. I don't know when an 8-bit ASCII standard was
>introduced.
>
Hardly a standard; more a Babel:
https://www.iana.org/assignments/character-sets/character-sets.xhtml
-- gil
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