To use CyberDEFs, you'll need a Mac running System 4.2 or higher. To accomodate large data structures, you'll need a commensurate amount of RAM and/or virtual memory.

If you want to display JPEG-compressed PICTs, you'll want an extraordinary amount of memory available. When PictCDEF encounters a pict structure whose dimensions are beyond its borders—and the "noClip" var code is in place—you'll need a byte of memory for every pixel of your picture times its bit depth. These NoClip picts are the worst memory hogs in the civilized world!

Additionally, since all text-oriented CyberDEFs are capable of handling text larger than 32K, memory allowance must be made for large text blocks as well.