PowerPC Macs - Gravitation Ltd. 5.0 will emulate on a Power Macintosh.
680x0 Macs - Gravitation Ltd. 5.0.
680x0 Macs with a Math Coprocessor - Gravitation Ltd. 5.0 - 881.
(Both versions will work, but the 881 version will run faster. Suitable math coprocessors include the 68881, 68882, and 68040 built in.)
System Version Requirements
For Black and white - System 6.0.7 or later.
For Color - System 7.0 or newer and 256 (or more) colors.
Memory Considerations
The amount of free memory required depends on the size of your screen and the pixel depth (number of colors) it is set to display. Larger screens and higher pixel depths increase the memory requirement. The program will alert you if you need to increase it's memory allocation. Program memory can be increased by selecting the Gravitation Ltd. icon and choosing Get Info from the Finder.