Fix opcode 00C0. I had accidentally used data_length instead of data_destination as the third parameter to memset, which made it clear more pixels than it was supposed to
Fix opcode 00C0. I had accidentally used data_length instead of data_destination as the third parameter to memset, which made it clear more pixels than it was supposed to

Update opcode 00FB, 00FC and D000. Now all opcodes, that changes the video memory, should be supported both in SuperChip mode and Chip-8 mode

Add some comments to opcode 00FB and 00FC

joelabr/YACE