Manual Number: 40110-005-2
Page 86
ISA BIOS NMI Handler Messages
The ISA NMI (non-maskable interrupt) messages are described below.
Message
Description
Memory Parity Error
Memory failed. The message appears as follows:
MEMORY PARITY ERROR AT XXXXX ;
where XXXXX is the address (in hexadecimal) at which
the error has occurred. If the memory location cannot be
determined, the message is “Memory Parity Error ????”
I/O Card Parity Error
An expansion card failed. The message appears as follows:
I/O PARITY ERROR AT XXXXX ;
where XXXXX is the address (in hexadecimal) at which
the error has occurred. If the address cannot be determined,
the message is “I/O Card Parity Error ????”
DMA Bus Time-Out
A device has driven the bus signal for more than 7.8
microseconds.
Port 80 Codes
The following codes are presented on Port 80H as the BIOS performs its reset procedure.
Code
Description
Uncompressed Initialization Code Checkpoints
D0
NMI is disabled. Power-on delay starting. Initialization code checksum to be
verified next.
D1
Initializing DMA controller, performing keyboard controller BAT test, starting
memory refresh and entering 4GB flat mode next.
D3
Starting memory sizing next.
D4
Returning to real mode. Executing any OEM patches and setting stack next.
D5
Passing control to uncompressed code in shadow RAM at E000:0000H. Initialization
code copied to segment 0 and control to be transferred to segment 0.
D6
Control in segment 0. Checking if <Ctrl> + <Home> was pressed and verifying
system BIOS checksum. If <Ctrl> + <Home> was pressed or system BIOS
checksum is bad, going to checkpoint code E0H next. Otherwise, going to checkpoint
code D7H.
D7
Main BIOS runtime code to be decompressed and control to be passed to main BIOS
in shadow RAM. Boot Block Recovery Code Checkpoints:
E0
Onboard floppy controller initialized, if any. Beginning base 512KB memory test
next.
E1
Initializing interrupt vector table next.
E2
Initializing DMA and interrupt controllers next.
Summary of Contents for SB686P Series
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