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System diagnostic tests (continued)
Component Tests
Memory Walking 0
(continued)
Address
Refresh
Hard disk drives
Hard disk format
Media analysis
Performance
Seek
Read/verify
Check test cylinder
Force bad tracks
Floppy disk
Diskette format
drives
Drive speed
Random read/write
Sequential read/write
Disk change line
Keyboard Controller
Scan/ASCII code
Video
Function
Checks data lines for shorts
and bits that are 0
Checks for address line shorts
Checks the refresh interval
See ‘Hard Disk Diagnostics’
See ‘Floppy Disk Diagnostics’
Tests the keyboard controller
Tests the scan codes assigned
to the keys
Keyboard clock line
Keyboard data line
Adapter
Attribute
Tests the keyboard clock line
Tests the keyboard data line
Tests the display adapter
memory
Tests the display adapter
attributes
80 x 25 display
40 x 25 display’
320 x 200 graphics’
Tests the 80 x 25 display
Tests the 40 x 25 display
640 x 200 graphics*
Tests the 320 x 200 graphics
display
Tests the 640 x 200 graphics
display
* Test appears only if you have installed a color monitor.
Performing System Diagnostics
B-11