| Beep Code | Error Description | Beep Code | Error Description |
| 1-1-3 | CMOS Read/Write | 4-2-4 | Gate A20 failure |
| 4-4-3 | Parallel Port error | 1-3-3 | RAM Refresh Verification error |
| 1-1-4 | ROM BIOS Checksum failure | 4-2-3 | Shutdown failure |
| 4-4-2 | Serial Port error | 1-3-4 | First 64K RAM Chip/Data Line failure |
| 1-2-2 | Programmable Interval Timer failure | 4-2-2 | Timer Tick failure |
| 4-4-1 | Realtime Clock failure | 1-4-1 | First 64K RAM Odd/Even Logic |
| 1-2-3 | DMA Initialisation failure | 4-2-1 | Video ROM search proceeding |
| 4-3-2-3 | RAM test above 64K failure | 1-4-2 | First 64K RAM: Address Line |
| 1-3-1 | DMA Page Register Read/Write failure | 3-4-2 | Display Retrace failure |
| 1-4-3 | First 64K RAM: Parity failure | 3-4-1 | Display Memory failure |
| 1-4-4 | Fail-Safe Timer Feature (EISA only) | 3-4-3 | Keyboard Controller failure |
| 2 | Software NMI Port failure (EISA only) | 3-1-2 | Slave DMA Register failure |
| 3-1-3 | First 64K RAM Chip/Data Line failure | 3-1-4 | Master Interrupt Mask Register failure |
| 3-4-2 | Slave Interrupt Mask Register failure | 4-3-1 | Unexpected Interrupt in Protected Mode |