Appendix A
(1E)Select memory type.
(1E)Global equipment byte set for proper display type.
(1E)If EISA NVM checksum is good, execute EISA initialization(EISA BIOS ONLY). Size
system memory.
(1E)Test keyboard controller.
ACER
AMI
Award
Compaq
Phoenix&Dell (1E)[Beep]=2-4-3 1st 64K RAM chip or data line failure- bit E.Base 64K RAM
test(16 bits).
Error Code - 1F
AMI
Award
Compaq
(1F)Video mode set call for mono/color begins. Mode set call for mono/color OK.
Set EISA mode; If EISA non- volatile memory checksum is good, execute EISA initialization.
If not, execute ISA test an clear EISA mode flag. Test EISA configuration memory
integrity(checksum & comm.- unication interface).
(1F)Test system memory.
(1F)Test 286 protected mode.
Phoenix&Dell (1F)[Beep]=2-4-4 1st 64K RAM chip or data line failure- bit F.
ACER
AMI
AST
Award
Compaq
Error Code - 20
(20)Test 128K.
(20)Memory refresh period 30 micro second test complete. Base 64K memory/address test
started. Address line test to be done next. Video mode set
completed.
(20)Power up bus board(EISA only).
(20)Enable slot 0;Initialize slot 0(system board).(Check memory size).8259 stuck
bits test.
(20)Test real and extended memory.
Phoenix&Dell (20)[Beep]=3-1-1 master DMA register test in-progress or failure. Test DRAM
refresh.(Beep)=1-3-1-1. Upper 16 of 32 bit test failed.
AMI
Award
Compaq
Error Code - 21
(21)Address line test passed. Going to do toggle parity. (21)ROM type 27256 verified. Video
display OK.
(21)Enable slots 1 through 15;Initialize slot 1.Test stuck NMI bits (parity I/O
check).
(21)Init time-of-day.
Phoenix&Dell (21)[Beep]=3-1-2 slave DMA register test in-progress or failure.
AMI
Award
Compaq
Error Code - 22
(22)Toggle parity over. Going for sequential data R/W test on 64K memory. Power
on message display OK.
(22)Enable slots 2; Initialize slot 2.Test 8259 working.
(22)Init 287 Coprocessor.
Phoenix&Dell (22)[Beep]=3-1-3 master interrupt mask register test in- progress or fail. Test 8742
keyboard controller.(Beep)=1- 3-1-3
AMI
Award
Compaq
Error Code - 23
(23)Base 64K sequential data R/W test passed. Going to SET BIOS stack and to do
any setup before Interrupt vector Init. Any setup before interrupt vector Init about to
start. Power on message displayed.
(23)Enable slots 3;Initialize slot 3.Test protected mode.
(23)Test keyboard and interface.
Phoenix&Dell [Beep]=3-1-4 slave interrupt mask register test in-progress or fail.
ACER
AMI
Award
Compaq
Phoenix
AMI
Award
Compaq
Error Code - 24
(24)Test keyboard controller(8042).
(24)Setup required before vector initialization complete. Interrupt vector initialization about to
begin.
(24)Enable slots 4;Initialize slot 4.Size extended memory.
(24)reset A20 ads set default CPU speed.
(24)Set ES segment to register to 4 GB.(beep)=1-3-2-1. Verify CMOS/Configure
CMOS.
Error Code - 25
(25)Interrupt vector initialization done. Going to read Input port of 9042 for turbo
switch(if any).Going to read I/O port of 8042 for turbo switch(if any).
(25)Enable slots 5;Initialize slot 5.Test extended memory.
(25)Test diskette subsystem.
Phoenix&Dell (25)[Beep]=none interrupt vector loading in-progress.
AMI
Award
Compaq
Phoenix 6.0
AMI
Error Code - 26
(26)I/O port of 8042 is read. Going to initialize global data for turbo switch. Going
to initialize global data for turbo switch.
(26)Enable slots 6;Initialize slot 6.Test protected mode exceptions.
(26)Test fixed disk subsystem.
(26)Enable A20 line. Verify/Load NVRAM parameters.
Error Code - 27
(27)Global data initialization for turbo switch is over. Any initialization before
setting video mode to be done next.
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