Acer Aspire X3990 Desktop Service Guide
Page 77
Obtain the failing symptoms in this chapter are only intended to test Acer products. Verify the symptoms by attempting to recreate the failure by running the diagnostic tests or repeating thesame operation. 3. Chapter 4 69 Non-Acer products, prototype cards, or modified options can give false errors and invalid system responses. 1. Refer to "Power System check...
Obtain the failing symptoms in this chapter are only intended to test Acer products. Verify the symptoms by attempting to recreate the failure by running the diagnostic tests or repeating thesame operation. 3. Chapter 4 69 Non-Acer products, prototype cards, or modified options can give false errors and invalid system responses. 1. Refer to "Power System check...
Acer Aspire X3990 Desktop Service Guide
Page 80
...is done. See Bootblock Recovery Code Checkpoints sectionfor more information. NMI is done including RTC and keyboard controller. Re-enable CACHE. Test base 512KB memory. Set stack. BIOS now executes out of checkpoints that flat mode is enabled. Copying Main BIOS into memory.... checkpoint is either a byte or word value output to I/O port 80h.The BIOS outputs checkpoints throughout bootblock and Power-On Self Test (POST) to determine if BIOSrecovery is forced. Bootblock Initialization Code Checkpoints The Bootblock initialization code sets up the chipset,memory, and ...
...is done. See Bootblock Recovery Code Checkpoints sectionfor more information. NMI is done including RTC and keyboard controller. Re-enable CACHE. Test base 512KB memory. Set stack. BIOS now executes out of checkpoints that flat mode is enabled. Copying Main BIOS into memory.... checkpoint is either a byte or word value output to I/O port 80h.The BIOS outputs checkpoints throughout bootblock and Power-On Self Test (POST) to determine if BIOSrecovery is forced. Bootblock Initialization Code Checkpoints The Bootblock initialization code sets up the chipset,memory, and ...