Cleared from here at the first start (START), and from CELL_LOOKED_UP at every new game (NEW_GAME), so only the random number, the font base, the saved stack pointer and the two control bytes survive from one game to the next; the turn counter is outside the cleared part too, but is set again from FRAMES at every new game. The snapshot's bytes here are what the tape's block held: none of them is ever read before it is written.

The 23 object records from KNIGHT on are 16 bytes each, updated in turn every turn by the main loop through UPDATES: +0 the graphic, which picks the update routine (0 an empty record); +1 and +2 U, a word whose high byte is the town's column and low byte the place across the cell; +3 and +4 V the same, the high byte the row; +5 the speed (for a find, the type of cell it came from, SPAWN_FIND); +6 the facing in bits 6 and 7 (bit 6 along U rather than V, bit 7 backwards), and in the low bits a count -- for the knight bits 0-2, his turning; for a monster or a find bits 0-5, the turns before it next changes direction (WANDER_STEP, STEER); +7 the flags -- bit 0 stopped by a wall this turn (MOVE_CLIPPED), bit 1 drawn this turn (DRAW_SPRITE, cleared by the sound routines that play only for things on the screen), bit 5 a monster that makes for the knight when it turns (STEER), bit 6 its sprite mirrored and bit 7 upside down (TURN_SPRITE); +8 and +9 the half-size in U and V, centre to edge; +A and +B this turn's step in U and V, signed; +C and +D the drawing offset, added to where it projects on the screen; +E and +F where it was last drawn.