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Error Message
Gate A20 Error
Invalid Boot Diskette
Keyboard Controller Error
Keyboard is Locked . . .
Please Unlock It
Keyboard Stuck Key Detected
Master DMA Controller Error
Master Interrupt Controller Error
Memory Size Decreased
Off Board Parity Error
Slave DMA Controller Error
Slave Interrupt Controller
System Memory Size Mismatch
Timer Channel 2 Error
Explanation
Gate A20 on the keyboard controller is not
working. Call for service.
The BIOS can read the disk in floppy drive A,
but cannot boot the system. Use another boot
disk.
The keyboard controller has failed during
POST.
Some systems have an electronic key that
enables the user to lock the keyboard.
There is a key pressed down.
Error in the master DMA channel.
Master Interrupt Controller failed during
POST.
The amount of memory on the Clean Screen II
is less than the amount in CMOS RAM.
Run Setup.
Parity error in memory installed in an expan-
sion slot. The format is:
OFF BOARD PARITY ERROR ADDR
(HEX) = (XXXX)
XXXX is the hex address where the error
occurred.
Error in the slave DMA channel.
Slave Interrupt Controller failed during POST.
The amount of memory on the Clean Screen II
is different than the amount in CMOS RAM.
Run Setup.
Most systems include two timers. There is an
error in timer 2.
Appendix C: Troubleshooting
43
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