Toshiba A20-S259 - Satellite - Pentium 4 2.66 GHz Maintenance Manual page 76

2 Troubleshooting Procedures
LED Status
(03h)
04h SMRAM initialization
05h CPU initialization
2-26
Table 2-3 Printer port LED boot mode status (4/8)
Test item
2.12 Sound Troubleshooting
Message
Setting resume error request
System BIOS ROM to RAM copy (The system
halts when an error is detected.)
SMRAM initialization
Check of Wake Up factor
SMRAM base rewrite and BIOS CPU state map
store
Enabling SMI by ASMI
Initialization of devices that needs initialization
before PCCI Bus initialization
PIT test (at Cold Boot) and initialization of PIT
Setting test pattern for PIT#0 CH0
Check whether the test pattern set can be read
PIT CH0 initialization (setting tim er interrupt
internal to 55m/s)
PIT CH2 initialization (setting the frequency for
sound generator to 55 m/s)
PIT CH1 test (Check whether the refresh signal is
working properly when the refresh interval is
30m/s. The system halts when the time is out.)
PIT CH2 test (Check whether the speaker gate is
working properly.)
Measuring of CPU clock
Enabling SMI except for auto-off function
Battery discharge current control (ICmA)
Executing division proves for measuring IRT time
Setting of clock generator
Check of parameter block A
CPU initialization
Micro code update
Check of Geyserville support
Setting CPU clock to high
Setting of Graphics Aperture Size
Satellite A20 Maintenance Manual (960-444)