Memory Tests
RAM Address Line
Independence Test
Verifies the address independence of real-mode RAM (no address
lines stuck together). Test failure causes an error code to display.
Size Extended Memory
Sizes and clears the protected mode (extended) memory and writes
the value into CMOS bytes 30h and 31h. If the system fails to switch
to protected mode, an error code is displayed.
Real-Mode Memory Test
(First 640KB)
Read/write test on real-mode RAM. (This test is
not done during a
reset using
[CTRL] [ALT] and [DELETE]
). The test checks each
block of system RAM to determine how much is present. Test failure
of a 64 KB block of memory causes an error code to display, and the
test is aborted.
Shadow RAM Test
Tests shadow RAM in 64 KB segments (except for segments
beginning at A000h, B000h, and F000h). If they are
not being used,
segments C000h, D000h and E000h are tested. Test failure causes
an error code to display.
Protected Mode RAM
Test (Extended RAM)
Tests protected RAM in 64 KB segments above 1 MB. (This test is
not done during a reset using
[CTRL] [ALT] and [DELETE]
). Test
failure causes an error code to display.
Keyboard / Mouse Tests
Keyboard Test
Invokes a built-in keyboard self-test of the keyboard’s
microprocessor and tests for the presence of a keyboard and for
stuck keyboard keys. Test failure causes an error code to display.
Mouse Test
If a mouse is present, invokes a built-in mouse self-test of the
mouse’s microprocessor and for stuck mouse buttons. Test failure
causes an error code to display.
Tests of Flexible Disk Drive A
Flexible Disk Controller
Subsystem Test
Tests for proper operation of the flexible disk controller. Test failure
causes an error code to display.
Coprocessor Tests
Internal Numeric
Coprocessor Test
Checks for proper operation of the numeric coprocessor part of the
processor. Test failure causes an error code to display.
Parallel Port Tests
Parallel Port Test
Tests the integrated parallel port registers, as well as any other
parallel ports. Test failure causes an error code to display.
Serial Port Tests
Serial Port Test
Tests the integrated serial port registers, as well as any other serial
ports. Test failure causes an error code to display.
Hard Disk Drive Tests
Hard Disk Controller
Subsystem Test
Tests for proper operation of the hard disk controller. Test failure
causes an error code to display. The test does not detect hard disk
replacement or changes in the size of the hard disk.