If the OS can't see the RAM, then the OS provided ramdisk can't use it either. But in this case, the use-case for using a ramdisk for a PS scratch disk came fr

If the OS can't see the RAM, then the OS provided ramdisk can't use it either. But in this case, the use-case for using a ramdisk for a PS scratch disk came from using an A23-aware patched version of System 5.x/6.x with a version of Photoshop that was not A23 aware. AFAIK This was a VERY tiny window around PS1.0 and possibly PS2.0, by the time of PowerPC and System 7.5+ (which this user had), there was very definitely absolutely no advantage to partitioning the RAM away from programs. At a guess, someone had told them to do it this way in the era of the early Mac IIs and such, but they hadn't grasped the 'why'