Version analysis of TP - 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.

.TP

Code variation 1 of 1A variation in the comments only

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Cassette, Electron
Flight, Docked, 6502SP, Master
 SKIP 1                 \ The current mission status, which is always 0 for the
                        \ cassette version of Elite as there are no missions
 SKIP 1                 \ The current mission status
                        \
                        \   * Bits 0-1 = Mission 1 status
                        \
                        \     * %00 = Mission not started
                        \     * %01 = Mission in progress, hunting for ship
                        \     * %11 = Constrictor killed, not debriefed yet
                        \     * %10 = Mission and debrief complete
                        \
                        \   * Bits 2-3 = Mission 2 status
                        \
                        \     * %00 = Mission not started
                        \     * %01 = Mission in progress, plans not picked up
                        \     * %10 = Mission in progress, plans picked up
                        \     * %11 = Mission complete