Version analysis of SLSP - Elite on the 6502

Skip to navigation

⌂ ∞ ▽ Elite on the 6502

My software archaeology sites

Mark Moxon's Software Archaeology

Elite on the 6502 *

Aviator on the BBC Micro

The Sentinel on the BBC Micro

Revs on the BBC Micro

Lander on the Acorn Archimedes

My writing sites

Mark Moxon's Travel Writing

Walking Land's End to John o'Groats

Tubewalker: The Tube, on Foot

Contact details and more

Mark Moxon's Homepage

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.

.SLSP

 SKIP 2                 \ The address of the bottom of the ship line heap
                        \
                        \ The ship line heap is a descending block of memory

Code variation 1 of 1A variation in the comments only

This variation is blank in the Master version.

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

Cassette, Flight, Docked, Electron
6502SP
                        \ that starts at WP and descends down to SLSP. It can be
                        \ that starts at D% and descends down to SLSP. It can be

                        \ extended downwards by the NWSHP routine when adding
                        \ new ships (and their associated ship line heaps), in
                        \ which case SLSP is lowered to provide more heap space,
                        \ assuming there is enough free memory to do so

Home page