PC Diagnostics, Testing, and Maintenance - Upgrading and Repairing PCs - page 997

PhoenixBIOS Version 4 (the most recent edition is Version 4, Revision 6.0) supports Pentium and
newer processors. The beep codes for this version are shown in Table 20.5 .
Table 20.5. PhoenixBIOS Version 4 and Later POST Beep Codes
IBM BIOS POST Error Codes
The original IBM PC and AT systems used BIOSs developed by IBM. However, more recent IBM
systems use BIOS products licensed from other vendors. Table 20.6 lists the beep codes for the IBM
BIOS.
Table 20.6. IBM BIOS Beep Codes