| 01x | Undetermined problem |
| 101 | SYSTEM BOARD Interrupt failure. |
| 102 | SYSTEM BOARD BIOS ROM Checksum Error (pc) |
| 102 | SYSTEM BOARD Timer failure. (pcat) |
| 103 | SYSTEM BOARD BIOS ROM Checksum Error (pc) |
| 103 | SYSTEM BOARD Timer interrupt failure. (pcat) |
| 104 | SYSTEM BOARD Protected mode failure. (pcat) |
| 105 | SYSTEM BOARD Last 8042 command not accepted. |
| 106 | SYSTEM BOARD Converting logic test. |
| 107 | SYSTEM BOARD Hot NMI test. |
| 108 | SYSTEM BOARD Timer bus test. |
| 109 | SYSTEM BOARD Direct memory access test error. |
| 115 | Cache parity error, ROM checksum, or DMA error |
| 116 | System board port read/write failure |
| 118 | System board parity or L2-cache error during previous power-on |
| 119 | "E" Step level 82077 (floppy controller) and 2.88M drive installed (not supported |
| 120 | Microprocessor self test error |
| 121 | 256K ROM checksum error (second 128Kb bank) |
| 121 | SYSTEM BOARD Unexpected hardware interrupts occurred. |
| 131 | SYSTEM BOARD Cassette wrap test failed.(bad system board) |
| 131 | DMA compatibility registers error |
| 132 | DMA extended registers error |
| 133 | DMA verify logic error |
| 134 | DMA arbitration logic error |
| 151 | SYSTEM BOARD Real Time Clock Failure (or CMOS ERROR on 5170) |
| 152 | SYSTEM BOARD CMOS Date and Time error (5170) |
| 161 | SYSTEM BOARD System Options Error (Battery failure) CMOS chip power |
| 162 | SYSTEM BOARD System options error (Run SETUP) CMOS Checksum error |
| 163 | SYSTEM BOARD Time and date not set (Run SETUP). |
| 164 | SYSTEM BOARD Memory size error (Run SETUP) CMOS does not match sys. |
| 170 | PC Convertible;LCD not in use when suspended |
| 171 | PC Convertible; base 128K checksum failure |
| 171 | DIAGS Error - Failed I/O addressing test |
| 171 | Rolling-bit-test failure on CMOS shutdown address byte |
| 172 | Rolling-bit-test failure on NVRAM diagnostic byte |
| 172 | PC Convertible;diskette active when suspended |
| 174 | PC Convertible;LCD configuration change |
| 175 | Bad EEPROM CRC #1 |
| 175 | PC Convertible;LCD alternate mode failed |
| 176 | Tamper evident |
| 177 | Bad priviledged-access-password CRC |
| 177 | Bad EEPROM |
| 178 | Bad EEPROM |
| 179 | NVRAM error log full |
| 180x | Sub address data error, x is the slot number of the error |
| 181 | Unsupported configuration |
| 182 | Priviledged-access switch (jmp 2) is not in the write-enable position |
| 183 | PAP is needed to boot from the sytem programs |
| 184 | Bad power on password checksum - erase it |
| 184 | Bad power on password |
| 185 | Bad startup sequence |
| 186 | Password-protection hardware error |
| 187 | Serial number error |
| 188 | Bad EEPROM checksum CRC #2 |
| 189 | Excessive incorrect password attempts |
| 191 | 82385 cache controller failure |
| 194 | System board memory error |
| 199 | SYSTEM BOARD User indicated configuration not correct. |