| | System Beep Codes |
| Beep | Description | Beep | Description |
| Code | Code |
| | |
| 1-1-2 | CPU register test in progress | 2-4-3 1st 64 K RAM chip or data line failure - bit E |
| 1-1-3 CMOS read/write test in progress or failure | 2-4-4 1st 64 K RAM chip or data line failure - bit F |
| 1-1-4 BIOS ROM checksum in progress or failure | 3-1-1 Slave DMA register test in progress or failure |
| 1-2-1 Timer Test in progress or failure | 3-1-2 Master DMA register test in progress or failure |
| 1-2-2 | DMA initialization in progress or failure | 3-1-3 | Master IMR test in progress or failure |
| 1-2-3 | DMA page register read/write test in progress | 3-1-4 | Slave IMR test in progress or failure |
| or failure |
| | | |
| 1-3-1 RAM refresh verification in progress or failure | 3-2-2 Interrupt vector loading in progress |
| 1-3-2 | 1st 64 K RAM test in progress or failure | 3-2-4 | Keyboard controller test in progress or failure |
| 1-3-3 | 1st 64 K RAM chip or data line failure (multi | 3-3-1 | CMOS power fail and checksum test in progress |
| bit) |
| | | |
| 1-3-4 1st 64 K RAM odd/even logic failure | 3-3-2 CMOS Config info validation in progress |
| 1-4-1 1st 64 K RAM address line failure | 3-3-3 | RTC/Keyboard controller not found |
| 1-4-2 1st 64 K RAM parity test in progress or failure | 3-3-4 Screen memory test in progress or failure |
| 1-4-3 Fail-safe timer test in progress | 3-4-1 Screen initialization test in progress or failure |
| 1-4-4 | Software NMI port test in progress | 3-4-2 Screen retrace tests test in progress or failure |
| 2-1-1 1st 64 K RAM chip or data line failure - bit 0 | 3-4-3 Search for video ROM in progress |
| 2-1-2 1st 64 K RAM chip or data line failure - bit 1 | 4-2-1 Timer tick interrupt test in progress or failure |
| 2-1-3 1st 64 K RAM chip or data line failure - bit 2 | 4-2-2 Shutdown test in progress or failure |
| 2-1-4 1st 64 K RAM chip or data line failure - bit 3 | 4-2-3 | Gate A20 failure |
| 2-2-1 1st 64 K RAM chip or data line failure - bit 4 | 4-2-4 | Unexpected interrupt in Protected Mode |
| 2-2-2 1st 64 K RAM chip or data line failure - bit 5 | 4-3-1 | RAM test in progress or failure above address |
| 0FFFFh |
| | | |
| 2-2-3 1st 64 K RAM chip or data line failure - bit 6 | 4-3-2 | No memory in Bank 0 |
| 2-2-4 1st 64 K RAM chip or data line failure - bit 7 | 4-3-3 | Interval Timer Channel 2 test in progress or |
| failure |
| | | |
| 2-3-1 1st 64 K RAM chip or data line failure - bit 8 | 4-3-4 Time-Of-Day Clock test in progress or failure |
| 2-3-2 1st 64 K RAM chip or data line failure - bit 9 | 4-4-1 | Super I/O chip failure |
| 2-3-3 1st 64 K RAM chip or data line failure - bit A | 4-4-4 | Cache test failure |
| 2-3-4 1st 64 K RAM chip or data line failure - bit B | | |
| 2-4-1 1st 64 K RAM chip or data line failure - bit C | | |
| 2-4-2 1st 64 K RAM chip or data line failure - bit D | | |
