3.5 Memory Test
To execute the Memory Test, select 2 from the DIAGNOSTIC TEST
menu,
press Enter
and
follow the directions displayed on the screen. Move the highlight bar to the subtest you want
to execute and press
Enter.
Subtest
01
RAM constant data (real mode)
This subtest writes a 256-byte unit
of
constant data
to
conventional memory (0
to 640 KB), then reads the new data and compares the results with the original
data.
The constant data is
FFFFh,
AAAAh,
5555h, and
OOOOh.
Subtest 02 RAM address pattern data (real mode)
This subtest writes address pattern data created by the exclusive-ORing
(XORing) to the address segment and address offset
in
conventional memory
(program end to
640 KB), then reads the new data and compares the results
with the original data.
Subtest
03
RAM refresh (real mode)
This subtest writes a 256-byte unit
of
constant data to conventional memory (0
to 640 KB), then reads the new data and compares the results with the original
data.
The constant data is AAAAh and 5555h.
NOTE:
There
is a short delay
between
write
and
read
operations,
depending
on
the
size
of
the
data.
Subtest 04 Protected mode
3-10
NOTE:
The
CONFIG.SYS
file must
be
configured without expanded memory
manager programs such as
FMM386.EXE,
FMM386.SYS or
QFMM386.SYS.
Also,
the
HIMFM.SYS must
be
deletedfrom
the
CONFIG.SYSfile.
This subtest writes constant data and address data to extended memory (maxi-
mum
address 100000h), then reads new data and compares the results with the
original data.
The constant data is FFh,
AAh,
55h, and
OOh.
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