As a mildly related curiosity, why didn't 4G memory address threshold on PCs get referred to as 'the bar'? I see in the first answer, both 1M and 4G RAM thresho

As a mildly related curiosity, why didn't 4G memory address threshold on PCs get referred to as 'the bar'? I see in the first answer, both 1M and 4G RAM thresholds get referred to as lines, which matches the terminology mainframes used for 16M threshold. That would seem to correspond more closely with 1M than 4G...