Scramble moved some address decoding. This can be solved with a software patch, or by adding 1 74LS157. Scramble also needs twice as much RAM as Galaxian; I piggy backed two 2114s on top of the existing ones.

Dave Spicer also gave me a required patch for Scramble: offset 1B5-1B7 needs to be patched as follows: Offset $1B5: From $67 To $C3 Offset $1B6: From $68 To $E0 Offset $1B7: From $B0 To $01