All 38,299 bytes are explained and the five listings reproduce the tape byte for byte. What follows are not gaps in the disassembly: they are things the game does whose why has not been measured, or that could not be reached.
You do not. The banner at 0x9CE6 is unreachable: no instruction in the tape loads anything from page 0x9C, none of the twelve key checks looks at Z, X or C — the C64's combination — and a read watchpoint over the block records nothing with the three keys held down on the title, on the options screen and during play. Measured, with its control, in Findings.
0x81A5, 0x8CBE, 0x93DC, 0x9722, 0x973F and 0x9DAD disassemble as complete, coherent routines — they start on a valid instruction, touch the same variables as the rest of the game and finish on a ret — but:
call, jp, ld hl, or bare word in the piece's 20,248 bytes;Either they belong to screens the test never reached — game over, the high score table — or they are dead code. They are declared as code because that is what they are; how you reach them is not known.
0xD8D5 reads the tape bit by hand through port 0xA2, and it is measured that it does not run. What is not known is whether it is another version's loader, a leftover from testing, or an alternative path that turns on under some condition we never met.
Each piece is preceded by eight bytes: 0xFE, the load address, the length, one more byte and two zeroes. The loader reads only four (ld de,00004h), so nobody looks at that fifth byte during loading.
The four values it takes are 0x6E, 0x6B, 0x5E and 0xC1. It looks like a checksum — the loader keeps one in b while reading (0xD8A5) — but since it is never compared against anything, it cannot be asserted.
The row table takes 0x800 bytes, that is 409 rows of five. The highest index any of the fourteen tracks uses is 173. From 174 on there are rows sitting there that no track names: are they from tracks that were dropped, or just padding?
All fourteen are drawn in full, but it has not been measured whether the game walks them to the end or the finish comes sooner. The 0xFF that closes each list is what makes 0x8B1B flag the end of a track, so in principle yes, but it has not been checked by running it.
The loading screen carries that signature bottom right. No Steve appears in the scroller's credits: the names there are Shaun Hollingworth, Colin Dooley, Peter Harrap, Chris Kerry, Greg Holmes, Terry Lloyd and Shaun Southern.