F:\WorkDir\test>SET C51TMP=F:\WorkDir\test 

F:\WorkDir\test>SET C51INC=C:\Keil\C51\INC\Atmel 

F:\WorkDir\test>F:

F:\WorkDir\test>CD\WorkDir\test

F:\WorkDir\test>C:\Keil\C51\BIN\c51.exe KEY4X4.C DB OE 

C51 COMPILER V6.23a - SN: K1DZP-5IUSHE
COPYRIGHT KEIL ELEKTRONIK GmbH 1987 - 2002

C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)

F:\WorkDir\test>CD
F:\WorkDir\test

F:\WorkDir\test>MOVE F:\WorkDir\test\KEY4X4.obj F:\WorkDir\test\Debug 

F:\WorkDir\test>MOVE F:\WorkDir\test\KEY4X4.lst F:\WorkDir\test\Debug 

F:\WorkDir\test\Debug>SET C51LIB=C:\Keil\C51\LIB 

F:\WorkDir\test\Debug>C:\Keil\C51\BIN\BL51.EXE @Projects.lnk 

BL51 BANKED LINKER/LOCATER V4.23 - SN: K1DZP-5IUSHE
COPYRIGHT KEIL ELEKTRONIK GmbH 1987 - 2002
KEY4X4.obj TO test.omf  RAMSIZE(128)

*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
    SEGMENT: ?PR?_SHOWASC?KEY4X4

Program Size: data=59.3 xdata=2 code=4615
LINK/LOCATE RUN COMPLETE.  1 WARNING(S),  0 ERROR(S)

F:\WorkDir\test\Debug>CD
F:\WorkDir\test\Debug