Built by BUILD_LOOKUP_TBLS at the start of every game, before the menu: here every byte value with its bits reversed, for mirroring sprites (VFLIP_SPRITE_DATA); and on the fourteen pages above it, in pairs, every byte value shifted right one to seven places and the bits that fall out of it, complemented, for drawing a sprite at any pixel (SPRITE_SHIFTED_RUN).

What the tape loads here is zeros, stack debris like the buffer's, and a font of capital letters A to U of some other program -- none of it the game's, all overwritten before it is read (measured, as for BUFFER).