IBM 8688 USB diagnostic tests, Video Controller Test, USB Functionality Test, USB Keyboard Test

Subtest	Description
Pixel Throughput	Reports the speed at which complex patterns are
	drawn on the screen.

These video tests might not appear correctly when displaying high-resolution VESA video modes on a multisync monitor. The monitor must be adjusted for each individual video mode. After the video mode you will be using appears, you must run the Aspect Ratio and Display Centering subtest to center the monitor.

The graphics mode tests are:

Test Name	Test Description	Type of Monitor
320 x 200	Displays a black and white 9 x 13 window and	All color monitors.
Graphics Test	redisplays it in reverse video. Then displays a
	three-color screen, a screen of random colors,
	then a black and white screen, and finally 256
	colors
640 x 200	Displays three black and white boxes, then	All color monitors
Graphics Test	goes from a black screen to a white screen,
	and back to a black screen.
640 x 350	Displays a 16-color screen, then fills the	EGA and VGA adapters
Graphics Test	screen with random colors, then returns to a	only.
	blank screen.
640 x 480	Displays a 16-color screen, then fills the	Only VGA adapters.
Graphics Test	screen with random colors, then returns to a
	blank screen.

Video Controller Test

This test verifies the functionality of the graphics controller in VGA mode. The video controller test verifies vertical synchronization, horizontal synchronization, the graphics controller, the attribute controller, and the DAC register.

USB diagnostic tests

The USB tests diagnose problems with USB devices.

For the USB test error codes, see “USB test error codes” on page 167.

USB Functionality Test

Select USB Test from the USB menu to diagnose problems with USB devices and to make sure that USB support is provided in the SAL/EFI.

USB Keyboard Test

Use this test to diagnose USB keyboard hardware functionality and to determine the data transfer rate between the USB host controller and the USB keyboard. This procedure tests the USB keyboard key codes and keystrokes.

Chapter 3. Diagnostics 53