...when you don't have NOP instructions XDD???

Hallo, It seem a strange opcode but its a smiley.

The necessary smiley trasformations are:
:-) -> :-D -> X-D -> XD -> XDD

In fact the problem is/was that the PCODE equivalent of X86 NOP opcode is/was unknown.

Search this WTK Tutorialz for NOP:

Gracias por leerme en ingles, pero hay una version en castellano XDD

On the net you can find also "P-Code Implementation by John Chamberlain"

Hope it helps,
void