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