HP TC4100 - Manual (Page 79)

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Chapter 4 Error Messages
*If the BIOS detects RAM error, it displays an additional word-bitmap (xxxx) indicating the address line or bits that failed.
1-3-1-3 Test 8742 Keyboard Controller
1-3-4-1 RAM failure on address line xxxx*
1-3-4-3 RAM failure on data bits xxxx* of low byte of memory bus
2-1-2-3 Check ROM copyright notice
2-2-3-1 Test for unexpected interrupts
1-2 Search for ROMs. One long, two short beeps on checksum failure
1 One short beep before boot
Table 4-2. Beep Codes
Beeps POST Routine Description