This is the first time I've written cross-chapter code. A TMS1100 is a TMS1000 with the extra 1k ROM bodged on using a Chapter Buffer, Chapter Address and Chapter Subroutine Store, which means that the actual program counter (423) is built up of three numbers - Chapter Address (one bit), Page Address (4 bits) and Program Counter (6 bits), making 2k in total.
I thought this would be annoying to program, but actually it doesn't make much difference. You can't actually set the CB flag (that is copied to CA when you jump/call) , just toggle it, so that's one thing to keep track of but it isn't that much of a problem to do so.
Note there is very little animation in this game, just moving blocks. But that applies to virtually all Microvision games.