Toshiba A20-S259 Maintenance Manual - Page 125

3.5 Memory Test 3 Tests and Diagnostics 3.5 Memory Test To execute the Memory Test, select 2 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions on the screen. Move the highlight bar to the subtest you want to execute and press Enter. Subtest 01 Conventional memory 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. Subtest 02 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 the new data and compares the result with the original data. The constant data is FFh, AAh, 55h, and 00h. Satellite A20 Maintenance Manual (960-444) 3-13