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# IBM PS/1 Audio Card

DOSBox Staging can emulate the rare IBM PS/1 Audio Card released in 1990 for IBM PS/1 computers (models 2011 and 2121). Relatively few games support this option, and the FM sounds very much like the PCjr or Tandy 1000, as they all use the same or similar TI sound chips. By the time the PS/1 Audio Card was released, the Sound Blaster was already available, making it largely obsolete.

PS/1 Audio support appears primarily in Sierra SCI1-era titles. Many of these games detect the card automatically.

Games with PS/1 Audio Card support

- BattleTech: The Crescent Hawks’ Revenge
- Castle of Dr. Brain
- Conquests of the Longbow
- The Dagger of Amon Ra
- Freddy Pharkas: Frontier Pharmacist
- Hoyle Classic Card Games
- King’s Quest V
- King’s Quest VI
- Leather Goddesses of Phobos! 2
- Leisure Suit Larry 1 (VGA remake)
- Leisure Suit Larry 5
- Leisure Suit Larry 6
- Lost Secret of the Rainforest
- Mixed Up Fairy Tales
- Pepper’s Adventures in Time
- Police Quest 3
- Police Quest: In Pursuit of the Death Angel (VGA remake)
- Prince of Persia
- Prince of Persia 2
- Quest for Glory I (VGA remake)
- Quest for Glory II
- Shanghai II: Dragon’s Eye
- Silpheed
- Space Quest I (VGA remake)
- Space Quest IV
- The Treehouse

## Mixer channels

The PS/1 Audio synthesiser outputs to the PS1 mixer channel, and the DAC to the PS1DAC channel.

## Configuration settings

IBM PS/1 Audio settings are to be configured in the `[speaker]` section.

##### ps1audio

  Enable IBM PS/1 Audio emulation.

  Possible values: `on`, `off` default

##### ps1audio_filter

  Filter for the PS/1 Audio synth output.

  Possible values:

  - `on` default – Filter the output. This applies a 3rd order high-pass filter at 160 Hz, and a 1st order low-pass filter at 2.1 kHz (`hpf 3 160 lpf 1 2100`).
  - `off` – Don’t filter the output.
  - `<custom>` – Custom filter definition; see Custom filter settings for details.

##### ps1audio_dac_filter

  Filter for the PS/1 Audio DAC output.

  Possible values:

  - `on` default – Filter the output. This applies a 3rd order high-pass filter at 160 Hz, and a 1st order low-pass filter at 2.1 kHz (`hpf 3 160 lpf 1 2100`).
  - `off` – Don’t filter the output.
  - `<custom>` – Custom filter definition; see Custom filter settings for details.