Disk accesses were faster with 1571 drives than 1541s, for sure, and having a supported RAM expansion could cut down on the number of accesses needed to do anyt

Disk accesses were faster with 1571 drives than 1541s, for sure, and having a supported RAM expansion could cut down on the number of accesses needed to do anything. Similarly, GEOS 128 got away with fewer accesses as it could make use of the extra RAM available (although running GEOS 64 on a 128 would be no better than running it on a C64). That GEOS 64 was "barely usable" was more a reflection of what the Commodore 64 could provide than anything else. And I think more people than not recognized that fact. The problem with PC/GEOS is that it arrived at a time when Microsoft was releasing Windows 3.0 and trying to strangle competition in that space. Had Berkeley started working on it much earlier and got it out the door in '88 or '89, it might have had better success than it did.