Error #401 in xxx, line xx: Unrecognized argument for rst instruction The code in question: _rPushRealO1 = $18 ;[..] rst _rPushRealO1 ; Push program name again ;[..] Am I missing something, or... ..Does Asm Studio 8x see my definition as a macro? Plus it doesn't 'understand' that $18 = 18h Henk Poley <><