__int16 __fastcall VgaDisplayEnable(unsigned __int16 *a1, unsigned __int16 *a2, _WORD *dst, int a4)
{
  unsigned __int16 *v4; // edi
  int i; // ebx
  __int16 result; // ax
  unsigned int v8; // esi
  _WORD *buf; // edi
  _WORD *v10; // edi
  int v11; // ecx
  unsigned int v12; // [esp+10h] [ebp-Ch] BYREF
  int v13; // [esp+14h] [ebp-8h] BYREF
  int v14; // [esp+18h] [ebp-4h]

  v4 = a2;
  v12 = 0;
  v14 = (int)a2;
  v13 = 0;
  SetMem(dst, 0x80u, 0);
  VgaDisplayDisable(a1, &v13, (unsigned __int16 *)&v12, a4);
  *dst = v13;
  for ( i = 1; i < 64; ++i )
  {
    VgaDisplayDisable(v4, &v13, (unsigned __int16 *)&v12, a4);
    result = 0;
    if ( !(_WORD)v12 )
      break;
    v8 = (unsigned __int8)v12 >> 4;
    v12 = v8;
    if ( v8 )
    {
      buf = &dst[i];
      memset(buf, 0, 4 * (v8 >> 1));
      v10 = &buf[2 * (v8 >> 1)];
      v11 = v8 & 1;
      i += v8;
      while ( v11 )
      {
        *v10++ = 0;
        --v11;
      }
      do
        v8 += 0xFFFF;
      while ( (_WORD)v8 );
      v4 = (unsigned __int16 *)v14;
      v12 = v8;
    }
    result = v13;
    dst[i] = v13;
  }
  return result;
}