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$0000-$3FFF, mode 7 layer or normal gameplay 4bpp BG tiles
$4000-$5FFF, sprite patterns
$6000-$6FFF, tile maps
$7000-$7FFF, 2bpp BG tiles, and/or 4bpp BG tiles during split screen mode-7 sections

define joypad1($0000)
define joypad1hi($0001)
define joypad2($0002)
define joypad2hi($0003)
define trigger1($0004)
define trigger2($0006)
define frame_done($0008)

define screen_brightness($0a)
define object_settings($0b)
define BG_mode($0c)
define mosaic($0d)
define BG1_tilemap($0e)
define BG2_tilemap($0f)
define BG3_tilemap($10)
define BG4_tilemap($11)
define BG1&2_char($12)
define BG3&4_char($13)
define BG1xlo($14)
define BG1xhi($15)
define BG1ylo($16)
define BG1yhi($17)
define BG2xlo($18)
define BG2xhi($19)
define BG2ylo($1a)
define BG2yhi($1b)
define BG3xlo($1c)
define BG3xhi($1d)
define BG3ylo($1e)
define BG3yhi($1f)
define BG4xlo($20)
define BG4xhi($21)
define BG4ylo($22)
define BG4yhi($23)
define Mode_7_settings($24)
define par_A_lo($25)
define par_A_hi($26)
define par_B_lo($27)
define par_B_hi($28)
define par_C_lo($25)
define par_C_hi($26)
define par_D_lo($27)
define par_D_hi($28)
define par_X_lo($25)
define par_X_hi($26)
define par_Y_lo($27)
define par_Y_hi($28)
define window_set_1&2($29)
define window_set_3&4($2a)
define window_set_OBJ($2b)
define window_pos_0($2c)
define window_pos_1($2d)
define window_pos_2($2e)
define window_pos_3($2f)
define window_logic_BG($30)
define window_logic_OBJ($31)
define main_screen($32)
define sub_screen($33)
define window_main($34)
define window_sub($35)
define color_math_settings($36)
define color_math_enable($37)
define window_color_red($38)
define window_color_green($39)
define window_color_blue($3a)
define screen_mode($3b)

sPPU_register_write:
php
rep #$30
lda {screen_brightness}
sta $2100
sei
tsx
lda #$210c
tas
pei ({BG1&2_char})
pei ({BG3_tilemap})
pei ({BG1_tilemap})
pei ({BG_mode})
lda #$2132
tas
lda {color_math_enable}
ora #$2000
pha
pei ({window_sub})
pei ({sub_screen})
pei ({window_logic_OBJ})
pei ({window_pos_3})
pei ({window_pos_1})
pei ({window_set_OBJ})
pei ({window_set_1&2})
txs
cli
sep #$30
lda {window_color_green}
ora #$40
sta $2132
rep #$20
lda {window_color_blue}
ora #$0080
sta $2132
ldx {BG1xlo}
stx $210d
lda {BG1xhi}
sta $210d
lda {BG1yhi}
sta $210e
lda {BG2xhi}
sta $210f
lda {BG2yhi}
sta $2110
lda {BG3xhi}
sta $2111
lda {BG3yhi}
sta $2112
lda {BG4xhi}
sta $2113
ldx {BG4yhi}
stx $2114
lda {Mode_7_settings}
sta $211a
lda {par_A_hi}
sta $211b
lda {par_B_hi}
sta $211c
lda {par_C_hi}
sta $211d
lda {par_D_hi}
sta $211e
lda {par_X_hi}
sta $211f
ldx {par_Y_hi}
stx $2120
plp
rts