if i do:

Assemble("JS 0x463BC7", 0x483B46, &am, 0, 0, errtext);

this returns me 0x78 0x7F

But!!!

0x463BC7 - 0x483B46 = 0x81 = 129 > 127!!

This doesnt happen in the Olly 1.10, only the engine on your site when i use it in my app...

Any ideas whats going wrong?

Many Thanks.

you mean the disasm.zip available in the main site ??
that version of disasm source is not current source it was of version 1.04 if i remember correctly if you want some source to look at try pvdasm by ben (he has released his source of the disassembler and is uptodate to match the compiled binary)

yes version 1.04.

isn't the source from 1.10 available, seems a bit strange to keep buggy source available...

i guess i will have to fix it myself, as my project is built around the ollyengine now.