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 How to Empty (Flush) File And Keyboard Buffers in Basic - Q58213
 
 Code Example 1
 --------------
 
 The following program uses MS-DOS Interrupt 21h (33 decimal) with
 function 0Ch (12 decimal), which flushes the input (type-ahead)
 keyboard buffer. To run this program inside the Visual Basic
 version 1.0 for MS-DOS (VBDOS.EXE) environment, you must load the
 Quick library VBDOS.QLB with the /L option.
 
    ' Use the following include file for Visual Basic 1.0 for MS-DOS:
    REM $INCLUDE: 'VBDOS.BI'
    DIM inregs AS regtype
    DIM outregs AS regtype
    inregs.ax = &HC00   ' 0Ch goes in AH, high byte of AX register.
                        ' 00 goes in AL, the low byte of AX register.
    CALL INTERRUPT(&H21, inregs, outregs)
    END