Memory Test - Toshiba T4500 User Manual

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 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.
Subtest 02 RAM Address Pattern Data (Real Mode)
This subtest writes address pattern data created by the exclusive-ORing (XORing),
to
end to 640 KB), then reads the new data and compares the result 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
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
NOTE: The CONFIG.SYS file must be configured without expanded memory manager
programs such as EMM386.EXE, EMM386.SYS or QEMM386.SYS. Also, the HIMEM.SYS
must be deleted from the CONFIG.SYS file.
This subtest writes constant data and address data to extended memory (maximum
address 100000h) then reads new data and compares the result with the original data.
the address segment and address offset in conventional memory (0 program
KB) then reads the new data and compares the result with the original data.
Current data
3-9