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how do i debug "TBIT AH,#20 assemble code" in C?

>> Compilation failure
subdir_rules.mk:7: recipe for target 'xxxxxxxobj' failed
"C:\Users\ADMINI~1\AppData\Local\Temp\8542010", ERROR! at line 3516: [E0003] Invalid immediate value
TBIT AH,#20 ; [CPU_] |225|

"C:\Users\ADMINI~1\AppData\Local\Temp\8542010", ERROR! at line 3516: [E0004] Illegal operand combination
TBIT AH,#20 ; [CPU_] |225|

i don't know how to find C code with "TBIT AH,#20". because compile fail about code do not generate assembly code , i don't know information assembly codes about C and error line in C code.