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n65/lib/memory.rb

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module Assembler6502
####
## Let's use this to simulate a virtual address space, by default
## we simulate the 64KB of addressable space on the NES
class MemorySpace
#### Some constants, the size of PROG and CHAR ROM
INESHeaderSize = 0x10
ProgROMSize = 0x4000
CharROMSize = 0x2000
####
## Create a completely zeroed memory space, 2**16 by default
def initialize(size = 2**16)
@memory = Array.new(size, 0x0)
end
####
## Read from memory
## TODO: This could use some boundry checking
def read(address, count)
@memory[address..(address + count - 1)]
end
####
## Write to memory
## TODO: This could use some boundry checking
def write(address, bytes)
bytes.each_with_index do |byte, index|
@memory[address + index] = byte
end
end
####
## Return the memory as an array of bytes to write to disk
def emit_bytes
@memory
end
end
end