Octek FOX-II, Руководство пользователя, Страница: 17 / 84

SYSTEM BIOS
When you install a new hard disk, make sure
whether it is already formatted. If not, the BIOS
has to check for a while before reporting the hard
disk error. In fact, the error arises only because
the hard disk is not formatted. If the hard disk
is formatted, you can run DOS F DISK and DOS
FORMAT.
Some fixed disks are specially handled and
must be set to 'Not Installed'. Consul t the fixed
disk manual for details.
OPTION 4 DISPLAY
Four types of display are supported:
I.
CGA 80 column mode
2. CGA 40 column mode
3 . EGA and VGA
4. Monochrome
If the type of display is incorrect, the BIOS
will prompt you and ask you to set up again. But
the BIOS is still able to display messages on the
display attached to the system.
Thus you can
enter the setup program.
The jumper JP4 must be set according to
this setting. Otherwise, the BIOS will report error
after self -test.
A-12
0
GENERAL FEATURES
Real A d d ress Mode
In this mode, physical memory is a
contiguous array of up to
I
megabyte. The
selector portion of the pointer is interpreted as
the upper 16 bits of a 20-bit address, and the
remaining 4 bits are set to zero. This mode of
operation is compatible with the 8088 and 8086.
Segments in this mode are 64KB in size and
may be read, written or executed. An interrupt
may occur if data operands or instructions attempt
to wrap around the end of a segment.
In this
mode, the information contained in the segment
does not use the full 64KB, and the unused end of
the segment may be overlay by another segment to
reduce physical memory requirements.
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