in symbols.pm, when parsing the listing, just record all of the source code by address.
in 08_momentum.pl, add a nifty little feature to tracing that spits out the source code.  way better than trying to decompile stuff, plus we can see the register contents in text output!
make _collisions and _momentum iterate over all of the movable bodies (currently two) and add y, z, ylo, zlo, yspeed, zspeed memory locations for an initial "monster".  also tweaked INTIM/TIM64 to cope with the extra scan lines available for background processing since six lines got taken away from the display.  bleah.