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luna68k: add psgpam(4) audio for LUNA, using YM2149 PSG/SSG sound chip. "PSG PAM" is a audio driver using "Pulse Amplitude Modulation" with the YM2149 PSG/SSG chip connected to the I/O processor HD647180X on LUNA. The driver plays up to 30 kHz PCM audio by manipulating PSG channel volumes at extremely high speed with 6.144 MHz HD647180X, a Z80 compatible sub CPU. https://www.youtube.com/watch?v=fR7PqaLpijQ https://www.youtube.com/watch?v=kCDZCgkwgBA Compatibilities with the existing XPIOCDOWNLD ioctl(2) to download and exec user programs (PSG sound driver player ported from PC-6001 etc.) on the HD647180X is still provided. https://twitter.com/tsutsuii/status/1533247362965315584 This psgpam(4) driver for NetBSD/luna68k was written by @moveccr during isaki-audio2 branch developments, and it was also demonstrated at Open Source Conference 2018 Kyoto: https://github.com/isaki68k/netbsd-src/tree/audio2 https://mail-index.netbsd.org/netbsd-advocacy/2018/08/07/msg000781.html https://twitter.com/tsutsuii/status/1025504875625365505 Note specifications of interrupts from the HD647180X to the host LUNA was confirmed by Kenji Aoyama on his LUNA-88K2 running OpenBSD/luna88k. I would like to thank all people still working on ancient LUNA machines!