4-18 Maintenance and Troubleshooting
Table 4-7 lists codes that are reported via the diagnostic port and the speaker only if
MANLOOP EQU TRUE and the “manufacturing jumper” indicates loop on POST. Other-
wise, these errors are reported via the screen and POST continues. Use of the manufactur-
ing jumper requires working correctly configured CMOS.
Table Section 4-7 Diagnostic Output and Beep Codes Looped on POST
Diagnostic Port Output
Beep Codes
Description of Test or Failure
E_TIMRI
EQU 34h
4-2-1
Timer tick interrupt test in progress or failure
E_SHUTD
EQU 35h
4-2-2
Shutdown test in progress or failure
E_GTA20
EQU 36h
4-2-3
Gate A20 failure
E_PMUXI
EQU 37h
4-2-4
Unexpected interrupt in protected mode
E_BAMEM
EQU 38h
4-3-1
RAM test in progress or failure above address
0FFFFh
E_TIMR2
EQU 3Ah
4-3-3
Interval timer channel 2 test in progress or failure
E_TODCK
EQU 3Bh
4-3-4
Time-of-Day clock test in progress or failure
E_SRLPT
EQU 3Ch
4-4-1
Serial port test in progress or failure
E_PRLPT
EQU 3Dh
4-4-2
Parallel port test in progress or failure
E_80287
EQU 3Eh
4-4-3
Math coprocessor test in progress or failure