What is not known. None of this is dressed up as a finding anywhere else on this site.
0x5632–0x5633: 0C 00. They sit between the ground tile shapes —three tiles of three bytes, 0x5629–0x5631— and the big tile ones —five of four bytes, 0x5634–0x5647—.
They fit neither the rows of three above nor the rows of four below, and in the 8192 bytes there is no ld hl,05632h nor anything landing there. They are declared as data because reassembly demands it, but who reads them is not known.
0x5E85 is the table MUSICA_NOTA (0x5E17) indexes with the high nibble of the note, and behind it come the PSG tracks. The trouble is that the pointers at 0x5E61 point at tracks starting inside that first stretch: 0x5E89 and 0x5EA9.
Either the durations actually used are very few, or those bytes serve both purposes at once. It is not settled, and that is why the block is declared whole as duraciones_y_pistas instead of split in two.
PINTA_EL_ROTULO_DE_FASE (0x5012) lays the drawing at 0x506D into the terrain buffer, at 0xEB31. And that drawing is ten 0x00 bytes and one 0xFF closing it.
Run through DESPLIEGA, ten zeros are not ten columns: with no 0x50 in between the column never changes, so all ten passes write to the same one. What is supposed to appear there, and why ten identical passes are needed, has not been checked.
The three screenshots on this site are real openMSX screens, but there is not a single figure here that came out of the emulator: not the cost of the interrupt, not how many VDP writes a frame makes, not how long a zone takes to pass. Everything else comes from reading the binary.
The zone 1 map is the one thing that comes from running the cartridge, and it was not run in openMSX either: it comes out of tools/z80run.py, an interpreter written here. Which is why it has not been checked against openMSX's VRAM, and that check is still owed.
tools/mapa.py flies the cartridge and captures zone 1 whole: 485 columns, and it comes out the same byte for byte every run.
Zones 2 onwards are not here, and the reason is the pilot, not the tool. The automatic pilot only holds its height and keeps firing, and in zone 2 it dies at the very same place every single time —416 frames after the zone starts, ten times out of ten—, so the zone restarts for ever and the capture never gets past it.
Getting the rest needs one of two things: a pilot that dodges what it has in front, or a way of making the cartridge build a given zone's terrain without having to fly all the way there. Neither has been tried.