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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 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 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.
44 Planar Clean Screen PC User’s Manual
CS Manual LAYOUT#1787 3/9/98 5:33 PM Page 44