Version analysis of HFX - 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.

.HFX

Code variation 1 of 2A variation in the comments only

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Cassette, Flight, Docked, 6502SP, Master
Electron
 SKIP 1                 \ A flag that toggles the hyperspace colour effect
                        \
                        \   * 0 = no colour effect
                        \
                        \   * Non-zero = hyperspace colour effect enabled
                        \
 SKIP 1                 \ This flag is unused in this version of Elite. In the
                        \ other versions, setting HFX to a non-zero value makes
                        \ the hyperspace rings multi-coloured, but the Electron
                        \ version is monochrome, so this has no effect

Code variation 2 of 2A variation in the comments only

This variation is blank in the Electron version.

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Cassette, Flight, Docked
6502SP, Master
                        \ When HFX is set to 1, the mode 4 screen that makes
                        \ up the top part of the display is temporarily switched
                        \ to mode 5 (the same screen mode as the dashboard),
                        \ which has the effect of blurring and colouring the
                        \ hyperspace rings in the top part of the screen. The
                        \ code to do this is in the LINSCN routine, which is
                        \ called as part of the screen mode routine at IRQ1.
                        \ It's in LINSCN that HFX is checked, and if it is
                        \ non-zero, the top part of the screen is not switched
                        \ to mode 4, thus leaving the top part of the screen in
                        \ the more colourful mode 5
                        \ When HFX is set to 1, the mode 1 screen that makes
                        \ up the top part of the display is temporarily switched
                        \ to mode 2 (the same screen mode as the dashboard),
                        \ which has the effect of blurring and colouring the
                        \ hyperspace rings in the top part of the screen. The
                        \ code to do this is in the LINSCN routine, which is
                        \ called as part of the screen mode routine at IRQ1.
                        \ It's in LINSCN that HFX is checked, and if it is
                        \ non-zero, the top part of the screen is not switched
                        \ to mode 1, thus leaving the top part of the screen in
                        \ the more colourful mode 2