Below are the ALR Beep codes that can occur. However, because of the wide variety of different computer manufacturers with this BIOS, the beep codes may vary.


01CPU register test in progress
02Real-time clock write/read failure
03ROM BIOS checksum failure
04Programmable internal timer failure (or no video card present)
05DMA initialization failure
06DMA page register write/read failure
08RAM-refresh verification failure
091st 64KB RAM test in progress
0A1st 64KB RAM chip or data line multi-bit failure
0B1st 64KB RAM odd/even logic failure
0CAddress line failure 1st 64KB RAM
0DParity failure 1st 64KB RAM
10-1Fbit 0-15 64KB RAM failure
20Slave DMA-register failure
21Master DMA-register failure
22Master-interrupt mask-register failure
23Slave-interrupt mask-register failure
25Interrupt vector loading in progress
27Keyboard-controller test failure
28RTC power failure and checksum calculation in progress
29Real-time clock-configuration validation in progress
2BScreen-memory test failure
2CScreen-initialization failure
2DScreen-retrace test failure
2ESearch believed operational on screen believed running with video ROM
30Monochrome display believed operable
32Color display (40 column) believed operable
33Color display (80 column) believed operable