59 lines
2.9 KiB
Markdown
59 lines
2.9 KiB
Markdown
# 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](../4-instrument/beeper.md) instrument editor.
|
|
|
|
## ROM export
|
|
|
|
two ROM export options exist:
|
|
|
|
- **iPod .tone alarm**: with the iPod _in disk mode,_ drag the export file into the `iPod_Control/Tones` folder.
|
|
- **GRUB_INIT_TUNE**: use with the GRUB bootloader.
|
|
- into the file `/etc/default/grub` add the following line with the text output copied and pasted where `text` is:\
|
|
`GRUB_INIT_TUNE="text"`\
|
|
then regenerate GRUB config.
|
|
- **export binary file**: creates a binary file instead of text. in either the GRUB shell or the GRUB config file, use the `play` command followed by the exported file's name.
|
|
|
|
## chip config
|
|
|
|
the following options are available in the Chip Manager window:
|
|
|
|
- **Clock rate**: sets the rate at which the chip will run.
|
|
- **Speaker type**: select which speaker to use:
|
|
- **Unfiltered**: raw square wave.
|
|
- **Cone**: filter it to simulate the sound of a cone speaker.
|
|
- **Piezo**: simulate the tiny speaker present in most PCs from the 2000s.
|
|
- **Use system beeper**: use the actual PC speaker in your machine for output. only works on Linux!
|
|
- **Reset phase on frequency change**: reset phase every time the frequency changes. many modern motherboards tend to do this.
|