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Loading and
Exchanging
Character Sets
(National for ASCII and
vice versa)
In a cold start that part of the
ASCII character set contained in
the Boot PROM of the computer
is loaded first. An ASCII charac
ter set is located in the file
CPM.SYS
on the system diskette.
During a cold start, this is loaded
by reading in the diskette as part
of the BIOS autostart function
and is simultaneously copied into
the memory area of the CRT
controller.
Following a cold start, the
indicator in the ASCII key,
located upper left in the key field,
lights up.
The system diskette loads and
executes the respective national
character set during
AUTOSTART
via the program
National (file name:
National.CMD).
If the character
set is not on the diskette, then
the ASCII character set remains
intact.
If the
national character set
is
loaded and the ASCII key de
pressed, then the LED indicator
turns off and the national charac
ter set is replaced by the
ASCII
character set.
NOTE:
If the national character set for
your country happens to be ASCII
(USA is ASCII), then nothing
happens when you depress the
ASCII key.
The ASCII character set is then
sent to the CRT controller and is
activated there. The national
character set is loaded back into
the BIOS memory area for
possible later use.
If the user loads his own charac
ter set using special BIOS rou
tines or a load program, then the
user can switch back and forth
between his character set and
the ASCII or NATIONAL charac
ter set just loaded, by depressing
the ASCII key.
6/18
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Страница 8: ...People System Overview General Information Components Main Unit Keyboard Display ...
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