When people are speaking about technology from 30+ years ago, they often get the details wrong... > ‘I knew the C64 inside out and the NES has the same process

When people are speaking about technology from 30+ years ago, they often get the details wrong... > ‘I knew the C64 inside out and the NES has the same processor so, in some ways it was very similar,’ says Graham. ‘The NES was character based, it had sprites the same as the C64, it was a bit faster. You could only access 64k at a time, though, so we had to bank in and out of memory buffers ’ Not 64K. While that is the size of the address bus, a NES cartridge can only realistically use address range 6000-FFFF on the cartridge. (Yes you can use 4020-5FFF as well, but that requires additional address decoding logic so it was seldom done). For the mapper that Codemasters used, the 16KB bank 8000-BFFF was switchable, and the 16KB bank C000-FFFF was the fixed bank at the end of the ROM, and 4020-7FFF was unused (open bus)