There are source code snippets at the end of the rom
which were removed from the final version:
;BIT 7 IN IN VBLANK,
BIT 6 IN DISPLAY RO
P2C1 EQU $29
;PALETTE TWO COL OR ONE RW
P2C2 EQU $2A
;PALETTE TWO COLOR TWO RW
P2C3 EQU $2B
;PALETTE TWO COLOR THREE RW
DPH EQU $2C
;DISPLAY LIST POINTER HIGH WO
P3C1 EQU $2D
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