[vcf-midatlantic] What would have used 64kB Simms?

I'm going through some old stuff I have, and came across some 64 kilobyte and 256 kilobyte simms. The earliest Simms I really remember using were 1MB for 386/486 computers though I could see 386s using the 256kb. Earlier than that I've touched a few 286s with sipp and simm slots, but even they were typically aiming for "the full 640KB". But most XT/286 products I touched had individual ram chips socketed or soldered on board. What devices would have used 64KB Simms back in the day? There are 9 chip as well, so I assume parity.