@thread
Thanks for the replies, I had tracked down that command in the mean time, compile a test program with AmiBlitz and confirmed it worked under 3,5 and not AmiBench,
Goods to know we are talking about the same thing.
Currently my attempts to reassemble it with In_Go and see what might be going on have failed. 'll have another go at some point, anyone with original src code to Blitz about?