Toshiba 420CDT User Manual page 29

LED status
01H KBC initialization
ROM checksum test
02H Special register initialization
PIT test
PIT initialization
PIT function check
03H CMOS check
KB initialization
04H Initialization of
memory configuration
05H SM-RAM check
06H Self test check
Read of Power Supply
information
07H ROM/RAM copy
08H Initialization of internal VGA
0AH First 64 KB memory test
0BH System memory initialization
0CH System initialization
0DH Interrupt vector initialization
18H PIC initialization
1FH Display initialization
25H System memory test
30H Extended memory test
40H DMA page register test
41H DMAC test
42H DMAC initialization
4AH PIC test
50H Mouse initialization
55H KBC initialization
60H HDD initialization
65H FDD initialization
70H Printer initialization
80H SIO initialization
90H Timer initialization
A0H NDP initialization
2-10
Table 2-1 Printer port LED boot mode status
Test item Message
BIOS is damaged! .....
PIT ERROR
—
MEMORY REFRESH ERROR
TIMER CH.2 OUT ERROR
CMOS CHECKSUM ERROR
CMOS BAD BATTERY ERROR
KBC ERROR
—
—
—
—
—
—
FIRST 64KB MEMORY ERROR
FIRST 64KB MEMORY PARITY ERROR
—
—
—
—
VRAM ERROR
SYSTEM MEMORY ERROR
SYSTEM MEMORY PARITY ERROR
EXTENDED MEMORY ERROR
EXTENDED MEMORY PARITY ERROR
DMA PAGE REGISTER ERROR
DMAC #X ERROR
—
PIC #X ERROR
—
KBC ERROR
HDC ERROR/HDD #0 ERROR
FDC ERROR/NO FDD ERROR
—
—
RTC UPDATE ERROR
TIMER INTERRUPT ERROR
—
420 Series