Emulator tests

Test ROMs that may be helpful for developing an emulator.

General

 * undisbeliever SNES Test ROMS
 * blargg hardware tests
 * TASVideos SNES Accuracy Tests

CPU

 * Forum thread: "Writing $4203 twice too fast gives erroneous result (not emulated)" - contains some tests for obscure multiplier behaviour, work in progress.

Input

 * ctrltest - Generic controller read test.
 * mset - Mouse peripheral test.