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TimesTwo is a disk compression software layer (driver) for early Mac OS.
TimesTwo-1-0.dsk (818.83 KiB / 838.48 KB)
TimesTwo v1.0 bootable (System 6.0.8) floppy disk / DSK image
Mac OS 6.x - Mac OS 7.x
Emulating this? It should run fine under: Basilisk II