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Rev 1573 Rev 1574
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  return(res);
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  return(res);
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}
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}
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unsigned short mdr_dos_read(unsigned short handle, void far *buf, unsigned short count, unsigned short *bytes) {
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  unsigned short res = 0;
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  unsigned short resax = 0;
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  unsigned short buf_off = FP_OFF(buf);
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  unsigned short buf_seg = FP_SEG(buf);
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  _asm {
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    push bx,
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    push cx
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    push dx
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    mov ah, 0x3f
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    mov bx, handle
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    mov cx, count
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    mov dx, buf_off
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    push ds
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    mov ds, buf_seg
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    int 0x21
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    pop ds
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    jnc done
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    mov res, ax
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    done:
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    mov resax, ax
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    pop dx
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    pop cx
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    pop bx
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  }
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  *bytes = resax;
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  return(res);
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}
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unsigned short mdr_dos_write(unsigned short handle, const void far *buf, unsigned short count, unsigned short *bytes) {
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unsigned short mdr_dos_write(unsigned short handle, const void far *buf, unsigned short count, unsigned short *bytes) {
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  unsigned short res = 0;
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  unsigned short res = 0;
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  unsigned short resax = 0;
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  unsigned short resax = 0;
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  unsigned short buf_seg = FP_SEG(buf);
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  unsigned short buf_seg = FP_SEG(buf);
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  unsigned short buf_off = FP_OFF(buf);
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  unsigned short buf_off = FP_OFF(buf);