Version analysis of SSPR - Elite on the BBC Micro and NES

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.

.SSPR

 SKIP NTY + 1 - SST     \ "Space station present" flag
                        \
                        \   * Non-zero if we are inside the space station's safe
                        \     zone
                        \

Code variation 1 of 1A variation in the comments only

Tap on a block to expand it, and tap it again to revert.

Cassette, Flight, Docked, 6502SP, Master
Electron
                        \   * 0 if we aren't (in which case we can show the sun)
                        \   * 0 if we aren't

                        \
                        \ This flag is at MANY+SST, which is no coincidence, as
                        \ MANY+SST is a count of how many space stations there
                        \ are in our local bubble, which is the same as saying
                        \ "space station present"