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implement mbc3 functionality

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Colby 2016-08-09 20:54:51 +10:00
parent b0d024108a
commit b95a41520c
1 changed files with 42 additions and 5 deletions
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47
lib/waterfoul/mbc/mbc3.rb
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@ -1,14 +1,51 @@
module Waterfoul
module MBC
class MBC3
def self.[](i)
fail
def initialize(program)
@game_program = program
@ram_bank = 0
@rom_bank = 0
@ram_enable = false
end
def self.[]=(i,v)
fail
def [](i)
case i
when 0x0...0x4000 # ROM Bank 0
@game_program[i]
when 0x4000...0x8000 # ROM Bank n
addr = i - 0x4000
offset = @rom_bank * 0x4000
@game_program[offset + addr]
when 0xA000...0xC000
if @ram_enabled
addr = i - 0xA000
if @ram_bank == 0
@ram[addr]
else
offset = @ram_bank * 0x8000
@ram[offset + addr]
end
else
0xFF
end
end
end
def []=(i,v)
case i
when 0x0...0x2000
@ram_enable = (v & 0xA == 0xA ? true : false)
when 0x2000...0x4000
@rom_bank = (v & 0x7F)
@rom_bank += 1 if @rom_bank == 0
when 0x4000...0x6000
if v <= 0x3
@ram_bank = (v & 0x3)
#elsif (0x8..0xC) === v
end
when 0x6000...0x8000
end
end
end
end
end