Dell Latitude CPi User Guide - Page 196
Coprocessor Error Exception Test, USB Memory Structure Test
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Subtests The 11 subtests in the System Set test group confirm the following computer functions: CMOS Confidence Test Checks the nonvolatile RAM (NVRAM) for accessibility and reliability of data storage by performing a data pattern check and verifying the uniqueness of memory addresses. DMA Controller Test Tests the direct memory access (DMA) controller and verifies the correct operation of its page and channel registers by writing patterns to the registers. Real-Time Clock Test Confirms the functionality and accuracy of the computer's real-time clock (RTC). System Speaker Test Checks the functionality of the speaker by generating eight tones. System Timers Test Checks the timers used by the microprocessor for event counting, frequency generation, and other functions. Only the functions that can be activated by software are tested. Interrupt Controller Test Generates an interrupt on each interrupt request (IRQ) line to verify that devices using that line can communicate with the microprocessor and that the interrupt controller sends the correct memory addresses to the microprocessor. Coprocessor Calculation Test Checks the use of different types of numbers and the math coprocessor's ability to calculate correctly. Coprocessor Error Exception Test Verifies the math coprocessor's ability to handle errors and to send IRQs to the microprocessor. PC Card Controller Test Checks the functionality of the PC Card controller on the system board. USB Register Test Checks the integrated registers of the Universal Serial Bus (USB) interface. This subtest does not test USB peripherals. USB Memory Structure Test Monitors the ability of a USB controller to process a simple set of memory-resident instructions.