5-3 System BIOS Error MessagesROM BIOS Checksum Error- Indicates an invalid ROM BIOS failure.8254 Error- Indicates an 8254 timer controller failure.8237 Error- Indicates an 8237 DMA controller failure.74612 Error- Indicates a 74612 page register failure.8259 Error- Indicates an 8259 interrupt controller failure.8742 Error- Indicates an 8742 controller failure.Check Battery- Indicates a system backup battery disconnection orpower loss.RTC Checksum Error- Indicates that the system memory refresh function doesnot work.Refresh Indicator Error- Indicates that the system memory refresh does not work.Base 84K Memory Error- Indicates that the system’s first 64K memory does notwork.FDC Error User Check- Indicates that the floppy diskette controller does not work.FDD Seek Failure- Indicates a failure of the floppy diskette drive “seekoperation.6 Chapter 5: Troubleshooting
