Toshiba A200 Personal Computer User Manual

2.4 System Board Troubleshooting 2 Troubleshooting Procedures
PORTEGE A200 Maintenance Manual (960-499) 2-23
Table 2-5 Debugging port status (4/7)
D port
F105h Initializes devices that are necessary to be initialized before initializing PCI bus.
Tests and initializes PIT.(only in COLD boot)
Sets test patterns to PIT#0 channel 0.
Checks if the test patterns can be read.
Initializes PIT channel 0 (sets the interval of timer interrupts to 55ms.
Initializes PIT channel 2. (sets the frequency of sound generator to
Tests PIT channel 1. (Check if the refresh signal operates correctly in the
condition that the refresh frequency is 30µ s.)
Tests PIT channel 2. (Check if the speaker gate operates correctly.)
Measures CPU clock.
Permits SMI other than auto off function.
Check if the Input power is over the rated one.
Controls battery-charging current.
Check if the AC adapter current is over the rated one.
Executes dividing process for measuring IRT time.
Sets the clock generator.
Checks the parameter block A.
Initializes CPU.
Measures the frequency of CPU and difference of frequency of Gsv High and
Checks if the CPU supports Geyserville.
Sets the CPU clock to High.
F106h Stores the memory size of each ROW to the buffer.
Reads EC version.
Renews the flash ROM type.
Judges the destination (Japan or overseas) from the DMI data.
Checks CMOS default setting. (Bad Battery, Bad checksum (ROM, CMOS)) ?
sets to default.
Initializes ACPI table. (for execution of option ROM)