What goes with What: A little angel told me to summarize what files go with what.... eg: if you change anything in the math.inc file, re-assemble 3d?.asm if you change anything in the stuff.inc file, re-assemble main?.asm 3d1.asm vars1.inc math.inc xscale.inc sin.inc arctan.inc poly.inc squares.inc 3d2.asm vars2.inc math.inc xscale.inc sin.inc arctan.inc poly.inc squares.inc main1.asm sphere.inc gamecolr.inc objects.inc stuff.inc main2.asm sphere.inc gamecolr.inc objects.inc stuff.inc irq.asm no included files pmode.asm no included files xmode.asm no included files xmouse.asm no included files files for definition of externals: eg, if you want to call some routines in xmode, have include xmode.inc in your assembley file. 3d.inc irq.inc pmode.inc xmode.inc xmouse.inc