Version analysis of ENGY - Elite on the 6502

This code appears in the following versions (click to see it in the source code):

Cassette, Disc (flight), Disc (docked), 6502 Second Processor, Master and Electron

Code variations between these versions are shown below.

.ENGY

 SKIP 1                 \ Energy unit
                        \
                        \   * 0 = not fitted
                        \
                        \   * Non-zero = fitted
                        \
                        \ The actual value determines the refresh rate of our
                        \ energy banks, as they refresh by ENGY+1 each time (so
                        \ our ship's energy level goes up by 2 each time if we
                        \ have an energy unit fitted, otherwise it goes up by 1)

Code variation 1 of 1A variation in the comments only

This variation is blank in the Cassette version.

Flight, Docked, 6502SP, Master, Electron
                        \
                        \ The enhanced versions of Elite set ENGY to 2 as the
                        \ reward for completing mission 2, where we receive a
                        \ special naval energy unit that recharges at a fast
                        \ rate than a standard energy unit, i.e. by 3 each time