| #
3febfda0 |
| 10-Jun-2022 |
tsutsui <tsutsui@NetBSD.org> |
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 HD6
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!
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