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6 #8000h Index/Control (3bit)
7 # Bit2-0 Command Number
8 # 0 - Select 2x1K VROM at PPU 0000h-07FFh (Banks 0-63)
9 # 1 - Select 2x1K VROM at PPU 0800h-0FFFh (Banks 0-63)
10 # 2 - Select 1K VROM at PPU 1000h-13FFh (Banks 64-127)
11 # 3 - Select 1K VROM at PPU 1400h-17FFh (Banks 64-127)
12 # 4 - Select 1K VROM at PPU 1800h-1BFFh (Banks 64-127)
13 # 5 - Select 1K VROM at PPU 1C00h-1FFFh (Banks 64-127)
14 # 6 - Select 8K ROM at 8000h-9FFFh
15 # 7 - Select 8K ROM at A000h-BFFFh
16 # N/A - Fixed 16K ROM at C000h-FFFFh (always last bank)
17 #8001h Data Register (Indexed via Port 8000h)
37 STEP_START i 0x00 0x40 4