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furnace/doc/7-systems/pcspkr.md
Electric Keet 20dc44b800 Teensy formatting change. 
None of these should be list items. It was a bad idea.
2023-08-04 22:16:02 -05:00

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PC Speaker

40 years of one square beep - and still going! Single channel, no volume control...

real output

so far this is the only chip in Furnace which has a real hardware output option. to enable it, select file > configure chip... > PC Speaker > Use system beeper.

be noted that this will only work on Linux as Windows does not provide any user-space APIs to address the PC speaker directly!

you may configure the output method by going in Settings > Emulation > PC Speaker strategy:

  • evdev SND_TONE: uses input events to control the beeper.
    • requires write permission to /dev/input/by-path/platform-pcspkr-event-spkr.
    • is not 100% frequency-accurate as SND_TONE demands frequencies, but Furnace uses raw timer periods...
  • KIOCSOUND on /dev/tty1: sends the KIOCSOUND ioctl to control the beeper.
    • may require running Furnace as root.
  • /dev/port: writes to /dev/port to control the beeper.
    • requires read/write permission to /dev/port.
  • KIOCSOUND on standard output: sends the KIOCSOUND ioctl to control the beeper.
    • requires running Furnace on a TTY.
  • outb(): uses the low-level kernel port API to control the beeper.
    • requires running Furnace as root, or granting it CAP_SYS_RAWIO to the Furnace executable: sudo setcap cap_sys_rawio=ep ./furnace.

real hardware output only works on BIOS/UEFI (non-Mac) x86-based machines! attempting to do this under any other device will not work, or may even brick the device (if using /dev/port or outb())! oh, and of course you also need the beeper to be present in your machine. some laptops connect the beeper output to the built-in speakers (or the audio output jack), and some other don't do this at all.

effects

ha! effects...

info

this chip uses the Beeper instrument editor.