Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
When DOS 5.0 and later runs with DOS=UMB, there will be not one but two memory arenas (assuming that UMBs are actually available). The AllocOper function (58h) was significantly extended to support UMBs.
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