Syntax
emu.addEventCallback(function, type)
Parameters
function - A Lua function.
type - Enum See eventType.
Return value
Returns an integer value that can be used to remove the callback by calling removeEventCallback.
Description
Registers a callback function to be called whenever the specified event occurs.
The callback function receives no parameters.
Syntax
emu.removeEventCallback(reference, type)
Parameters
reference - The value returned by the call to addEventCallback.
type - Enum See eventType.
Return value
None
Description
Removes a previously registered callback function.
Syntax
emu.addMemoryCallback(function, type, startAddress [, endAddress])
Parameters
function - A Lua function.
type - Enum See memCallbackType
startAddress - Integer Start of the CPU memory address range to register the callback on.
endAddress - (optional) Integer End of the CPU memory address range to register the callback on.
Return value
Returns an integer value that can be used to remove the callback by calling removeMemoryCallback.
Description
Registers a callback function to be called whenever the specified event occurs.
The callback function receives 2 parameters address and value that correspond to the address being written to or read from, and the value that is being read/written.
For reads, the callback is called after the read is performed.
For writes, the callback is called before the write is performed.
If the callback returns an integer value, it will replace the value – you can alter the results of read/write operation using this. e.g:
function writeCallback(address, value)
--This sets bit 0 to 0 for all CHR RAM writes
return value & 0xFE
end
emu.addMemoryCallback(writeCallback, emu.memCallbackType.ppuWrite, 0, 0x1FFF)
Syntax
emu.removeMemoryCallback(reference, type, startAddress [, endAddress])
Parameters
reference - The value returned by the call to addMemoryCallback.
type - Enum See memCallbackType.
startAddress - Integer Start of the CPU memory address range to unregister the callback from.
endAddress - (optional) Integer End of the CPU memory address range to unregister the callback from.
Return value
None
Description
Removes a previously registered callback function.