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"It is your mission to defend Earth from the aliens by shooting them." I'm unsure why but there are two copies of this game on the same
tape. The differences I could find are that the first copy's filename is in lowercase and auto-RUNs when loaded. The 2nd copy doesn't
auto-RUN and has a strange POKE in line 45 of its listing which seems to attempt to POKE into ROM, which obviously won't work. Finally
the keyboard reading routine on line 25 is different between the two versions. The first version of the game will work fine in standard
SP-5025 BASIC. The second version of the game will error at its keyboard reading line unless you load Speed BASIC first.
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