I just realized that a comparator design I was experimenting with from Millman & Taub’s 1965 classic textbook is essentially a mirror image of my Type Y prototype, less use of a darlington, or two transistor inputs. If the load resistors were in fact replaced with a PNP current mirror, then simgle-ended output could be taken from the current mirror, then tied to a PNP switching transistor. A mirror image where the output pulls up from Vee, or even another voltage like ground. So, the mirror image circuit is a useful way to get a positive-only voltage output, or a ground-referenced one.
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