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AST RESEARCH TECHNICAL BULLETIN TB-0019A                  7-16-84


                       IBM PC ERROR CODES


Below  is  a list of error codes that may occur during  the  POST 
(Power On Self Test) or when running the IBM Diagnostics.   If it 
were to occur during the POST, it would appear as a three or four 
digit number.  If it were to occur during the IBM Diagnostics, it 
would  appear  as "ERROR -- SYSTEM UNIT xxyy",  where xx  is  the 
device  number and yy is the error code.   The most common  error 
code is 01.   For example, the error message "ERROR - SYSTEM UNIT 
201"  would appear in the IBM Diagnostics if it were to detect  a 
memory error.


DEVICE ERROR         DEVICE NAME

   021               POWER SUPPLY
   101               SYSTEM UNIT
   201               MEMORY
   301               KEYBOARD
   401               MONOCHROME DISPLAY
   501               COLOR/GRAPHICS DISPLAY
   601               DISKETTE DRIVE(S)/ADAPTER
   701               MATH COPROCESSOR
   901               PARALLEL PRINTER ADAPTER
  1101               ASYNCHRONOUS COMMUNICATIONS ADAPTER - COM1
  1201               ALTERNATE ASYNCHRONOUS COMMUNICATIONS - COM2
  1301               GAME CONTROL ADAPTER
  1401               IBM MATRIX PRINTER
  1501               SYNCHRONOUS DATA LINK CONTROL COMMUNICATIONS
                     - SDLC                    
  1701               FIXED DISK DRIVE(S)/ADAPTER
  1801               EXPANSION UNIT
  2001               BINARY SYNCHRONOUS COMMUNICATIONS - BSC
  2101               ALTERNATE BINARY SYNCHRONOUS COMMUNICATIONS 
                     - ALT BSC
  2201               IBM CLUSTER ADAPTER

  2801               IBM 3278/79 EMULATION ADAPTER
  2901               IBM COLOR GRAPHICS PRINTER

  3301               IBM COMPACT PRINTER