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7-bit mode operation
Once
GO
and
G1
are determined by the host system, the ASCII control
characters SI and SO are used to switch
GO
to
G1
or
G1
to
GO;
SI for
GO
and
SO for
G1
are used to determine the current active character set. However,
you cannot change the characters that are already displayed on the screen or
stored in the character buffer. The following figure illustrates the concept of
character set control.
Character Set Selection for Outbound Operation
01
234567
B
h;ft In (51)
234567
ASCII
Characters
SCS-G1
01
234567
B
Special
Graphics
Shift Out (SO)
Alternate
Characters
Character Set Selection for Inbound/Keyboard Operation
01
234567
B
Sh;ft In (511
ASCII
Characte
B
Special
Graphics
SCS-G1
Alternate
Characters
Shift Out (SO)
5-77
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