Appendix A
(00)Going to give control to INT 19H boot loader.
Error Code-01
AMI
(01)Processor register test about to start,
and NMI to be disabled,286 reg.
Award
rocessor test 1;Processor status(1FLAGS) verification;
processor status flags carry, zero, sign, overflow.
The BIOS will set each of these
flags, verify they are set then turn each flag off and verify it is off.
Phoenix (01)[Beep]=none 80286 register test in –progress.
Error Code - 02
AMI (02)NMI is disabled. Power on delay starting. Power on de- lay starting.286reg.
AST (02)Test CPU register.
Award
(02)Processor test 2;Read/write/verify all CPU registers except SS,SP and BP with
ata pattern FF&00.Determine status of manufacturing jumper.
Chips&Tech (02)Test CPU register.
Dell (02)[Beep]=1-1-3 CMOS write/read test .
Phoenix (02)Verify real-mode operation(Beep)=1-1-1-3.CPU Flags test.
Phoenix (02)[Beep]=1-1-3 CMOS write/read test in-progress or failure.
Error Code – 03
AMI
(03)Power on delay complete.
To check soft reset/power
before keyboard BAT is in progress. ROM BIOS checksum(32K at F800:0) passed.
AST (03)Test 8042 keyboard controller reset.
Award
(03)Initialize Chips; Disable NMI,PIE,AIE,UEI,SQWV, disable video, parity
checking, DMA; Reset math Coprocessor; Clear all page registers,
shutdown byte; Initialize timer 0,1 and 2 including set EISA timer to a known
state; Initialize DMA controller
s 0 and 1; Initialize interrupt controller 0 and
1;Initialize EISA extended registers. Calculate BIOS EPROM and sign-
checksum;
fail if not 0.Initialize EISA registers(EISA)BIOS only).Clear 8042
Chips & Tech (03)ROM did not checksum.
Phoenix&Dell
Maskable Interrupt(NMI).[Beep]=1
Error Code – 04
AMI
(04)Any initialization before keyboard BAT is complete. Reading keyboard SYS
bit, to check soft reset/power-on. Re
ading keyboard SYS bit, to check soft
reset/power On. Keyboard controller test with and without mouse passed. 8259
AST (04)Low level keyboard communication, keyboard ID verification.
Award
(04)Test memory refresh toggle;
riodically refreshed in order to
keep the memory from decaying.
This function assures that the memory refresh
function is working properly.
Test CMOS RAM I/O port interface and verify battery
Chips & Tech (04)DMA Controller failed.
Phoenix&Dell
(04)Get the CPU type (Beep)=1
1.CPU register test. Programmable Interval
Error Code – 05
AMI
Going to enable ROM. i.e.
RAM/Cache if any. Going to enable ROM.i.e.
disable shadow RAM/cache if
any.Chipset initialization over,DMA and interrupt controller disabled. CMOS
pending interrupt disabled.
AST (05)Read keyboard input port.
Chips & Tech (05)System timer bad.
Award
(05)Keyboard controller s
test enable keyboard interface. Blank video,
keyboard; Keyboard controller initialization. Initialize Chips;
- WV, disable video, parity checking, DMA; Reset math Co-
processor; Clear all page registers,CMOS shutdo
wn byte; Initialize timer 0,1 and 2
including set EISA timer to a known state; Initialize DMA controllers 0 and
1;Initialize interrupt controller 0 and 1; Initialize EISA extended Regis-
manufacturing status, reset if set(loop 1
Phoenix&Dell (05)[Beep]=1-2-2 DMA initialization in-progress or failure.
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