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refactor memory mapping

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Colby 2016-07-20 14:21:24 +10:00
parent a68e9339d8
commit 346b4ae443
1 changed files with 19 additions and 13 deletions
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32
lib/waterfoul/mmu.rb
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@ -35,22 +35,21 @@ module Waterfoul
raise MemoryOutOfBounds if i > MEMORY_SIZE || i < 0
case i
when 0x0000..0x7FFF
when 0x0000...0x8000 # ROM Bank 0 + n
if @map_boot_rom && i <= BOOT_ROM_END_MEM_LOC
BootROM[i]
else
@cartridge[i]
end
when 0x8000..0xDFFF
# Working RAM
when 0x8000...0xA000 # Video RAM
@memory[i]
when 0xA000..0xBFFF
when 0xA000...0xC000 # RAM Bank
@cartridge[i]
when 0xE000..0xFDFF
# Working RAM (shadow)
when 0xC000...0xE000 # Internal RAM
@memory[i]
when 0xE000...0xFE00 # Internal RAM (shadow)
@memory[i - 0x1000]
when 0xFE00..0xFFFF
# Graphics, IO, Zero-page
when 0xFE00..0xFFFF # Graphics (OAM), IO, Zero-page
@memory[i]
end
end
@ -65,16 +64,23 @@ module Waterfoul
unless options[:hardware_operation]
case i
when UNMAP_BOOT_ROM_MEM_LOC
# unmap the boot rom when 0xFF50 is wrtiten to in memory
when UNMAP_BOOT_ROM_MEM_LOC # unmap the boot rom when 0xFF50 is wrtiten to in memory
@map_boot_rom = false if v == 0x1 && @map_boot_rom
when 0x0..0x7FFF
@cartridge[i] = v
when 0xFF46 # DMA transfer
dma_transfer v
when 0xFF04 # reset divider register
@memory[i] = 0
else
when 0x0...0x8000 # ROM Bank 0 + n
@cartridge[i] = v
when 0x8000...0xA000 # Video RAM
@memory[i] = v
when 0xA000...0xC000 # RAM Bank
@cartridge[i] = v
when 0xC000...0xE000 # Internal RAM
@memory[i] = v
when 0xE000...0xFE00 # Internal RAM (Shadow)
@memory[i - 0x1000] = v
when 0xFE00..0xFFFF # Graphics (OAM), IO, Zero Page
@memory[i] = v
end
else