EclaireXL

Received my board today.

I tried to understand the flash chip problems. All I found so far is that it has a 64KB sector size, so I've added detection by id so that we can have one v2 core for both different flash chips.

• Detect flash chip by id (sector size)
• Added 1 cycle delay on pokey highpass filter input (makes settings 5/7 work on PDM)
• Run pokey on final sub-cycle, rather than on memory access completed sub-cycle (reduces sample jitter)
• Convert audio to signed for HDMI output
• Display some flash chip info on F11 screen (chip id1/ chip id2/ sector size)