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It is possible to use SETBLOCK on a free memory block. Programs obviously should not be doing that, because they do not own free memory. However, DOS makes no attempt to prevent such calls. In addition, thanks to the surprising behavior noted above, successfully calling SETBLOCK on a free memory block will effectively allocate it.
Before we dive in, let me make one thing crystal clear: this isn't the first solar-powered power bank I've tested -- but it is the best. By far. Most of the ones I've tried in the past have been downright terrible, some even came with fake solar panels (yes, really) or solar panels that would actually drain the battery when out of the light. The others were mediocre, with the solar panel serving as little more than a gimmick to lure in buyers.