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About: Contended memory     Goto   Sponge   NotDistinct   Permalink

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Contended memory is Sinclair's name for a portion of the ZX Spectrum's 64 KB addressable memory space. With the full 64 KB, the Z80 microprocessor is the exclusive bus master, so it reads and writes operate at its full bus speed, but contended memory space is shared between the ULA and the Z80, with the ULA having higher priority. Contended memory occupies addresses 0x4000..0x7FFF of the Z80 memory map. This is the first 16 KB of RAM in the 48 KB machine and the entire RAM of the 16 KB machine.