SA1
The Super Accelerator 1 (SA1) chip was used in a number of SNES games, including the popular Super Mario RPG: Legend of the Seven Stars.
Similar to the 5A22 CPU in the SNES console, the SA1 contains a processor core based on the 65C816 with several programmable timers. The SA1 does not function as a slave CPU for the 5A22; both can interrupt each other independently.
The SA1 also features a range of enhancements over the standard 65C816:
- Upgraded 10 MHz clock speed, up from a maximum of 3.58 MHz
- Faster RAM
- Memory mapping capabilities
- Limited data storage and compression
- New DMA modes such as bitmap to bit plane transfer
- Built-in CIC lockout, for copy protection and regional marketing control
Read more about this topic: List Of Super NES Enhancement Chips