This indicates that all hardware tests were completed without encountering errors. Of course, having a description of those codes would be helpful, and different BIOSes have different meanings for the codes. This is a short list of most frequent on-screen BIOS error messages. Your system may show them in a different manner. There is an error in timer 2.
Several systems have two timers.
It would be a good idea to replace the battery. The previous value is different from the current value. Error in the first DMA channel. Error in the second DMA channel. The BIOS cannot communicate with the floppy disk drive controller.