Git ignores files in rom/ directory.
VIA 6522 peripheral port implementation.

Currently these registers can be written/read, but doing so
doesn't trigger anything; i.e. the peripheral ports are essentially
disconnected.
Extracted Ram implementation from memory.go to ram.go
Git ignores go6502 program, and log files.
Dispatch CPU in a goroutine.
VIA at 0xC000 instead of 0xD000.
Documentation regarding PCR register in VIA 6522.
CPX instruction; compare X.
Via6522.Reset() method.
Via6522 implements PCR, port A prints chars to stdout.
Log object passed around, instead of spewing to stdout.
findInstruction(opcode) panics for unknown opcode.
_END pseudo-instruction (0xFF); exits the emulator.