  Landauer's work led indirectly to criticisms of the Szilard argument although Landauer did not directly address the Szilard engine, or Maxwell's demon. According to his own comments in (Landauer 1986), it appears he believed that logically irreversible operations were a necessary part of a computation and these generated heat. Although it was known to be possible to simulate logically irreversible operations with logically reversible ones, this came with its own cost of additional bits of information needing to be stored. To avoid this storage, and to complete a thermodynamic cycle, required the additional bits to be reset to zero, with a corresponding entropy cost.