| 301 | KEYBOARD Keyboard software reset failure or stuck key failure |
| 302 | KEYBOARD User indicated error or PCAT system unit keylock is locked. |
| 303 | KEYBOARD Keyboard or system unit error. |
| 304 | KEYBOARD Keyboard or system unit error; CMOS does not match system. |
| 304 | Keyboard clock high; keyboard or system unit error |
| 306 | Unsupported keyboard attached |
| 341 | Keyboard error |
| 365 | KEYBOARD Replace Keyboard |
| 366 | KEYBOARD Replace Interface Cable |
| 367 | KEYBOARD Replace Enhancement Card or Cable |