Toshiba portege 610ct 620ct Instruction De Maintenance
610CT
3-9
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.
and follow the directions displayed on the screen. Move the highlight bar to the subtest you
want to execute and press Enter.
Subtest 01
Constant data
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 result with the original
data. The constant data is FFFFh, AAAAh, 5555h, and 0000h.
to 640 KB), then reads the new data and compares the result with the original
data. The constant data is FFFFh, AAAAh, 5555h, and 0000h.
Subtest 02
Address pattern data
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 result
with the original data.
(XORing), to the address segment and address offset in conventional memory
(program end to 640 KB), then reads the new data and compares the result
with the original data.
Subtest 03
Refresh
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 result with the original
data.
to 640 KB) then reads the new data and compares the result with the original
data.
The constant data is AAAAh and 5555h.
NOTE: There is a short delay between write and read operations, de-
pending on the size of the data.
pending on the size of the data.
Subtest 04
Protected mode
This subtest writes constant data and address data to extended memory (maxi-
mum address 100000h) then reads new data and compares the result with the
original data.
mum address 100000h) then reads new data and compares the result with the
original data.
The constant data is FFh, AAh, 55h, and 00h.