Microsoft KB Archive/49239

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Replace Case Mapping Function with Proprietary Version ID Number: Q49239

3.30 4.00 4.01 MS-DOS

Question:

Is there a way to replace the built-in case mapping function via INT 21H, function 38H?

Response:

Yes; you can do this by trapping Interrupt 21H and then looking for 38H. You then can return whatever you want to.