Toshiba A20-S259 - Satellite - Pentium 4 2.66 GHz Maintenance Manual page 75

2.12 Sound Troubleshooting
LED Status Test item
00h IRT Check system
01h Memory check
02h CMOS check and
initialization
03h Resume branch
Satellite A20 Maintenance Manual (960-444)
Table 2-3 Printer port LED boot mode status (3/8)
2 Troubleshooting Procedures
Message
Initialization of special register
PIT CH1 initialization size (Setting refresh interval
to 30 m/s)
Check of the type and size of DRAM (at Cold
Boot)
The system halts when the DRAM size is zero.
SM-RAM stack area test (The system halts when
the stack area can not be used.)
Cache configuration
Enabling L1 cache
CMOS access test (at Cold Boot) (the system
halts when an error is detected.)
Check of CMOS battery level
Check of CMOS checksum
CMOS data initialization (1)
Setting of IRT status (setting boot status and IRT
busy flag, the bit remained is zero)
Storing DRAM size
Resume branch (at Cold Boot)
Not resume when a CMOS error is detected
Not resume when resume status code is not set
Resume error check
ICH Power Failure error resume error 7Ah
SM-RAM checksum check resume error 73h
Check of change of memory configuration resume
error 73h
System BIOS RAM area checksum check resume
error 79h
PnP RAM checksum check resume error 77h
Transition to resume process
Resume error process
Reset of the CPU clock to low
Disabling all SMI
Clearing resume status
Return to ROM
Setting the area of C0000h to EFFFFh to PCI
(Disabling DRAM)
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