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# Super Nintendo Entertainment System/Super Famicom Documentation

Last updated March 19, 2024
Valid as of 1.32.1

Table of Contents:

- Introduction
- Settings Reference

## Introduction

The "snes_faust" emulation module is experimental, and not used automatically by default except for SPC and SNSF playback. To use this module rather than the "snes" module, you must either set the "snes.enable" setting to "0", or pass "-force_module snes_faust" to Mednafen each time it is invoked.

Timing is approximate, so some games may exhibit timing-related issues. The only input devices currently emulated are the standard SNES gamepad, mouse, and multitap. The following special cart chips and devices are emulated:

- CX4
- DSP-1 (HLE, currently unsuitable for use with netplay)
- DSP-2 (HLE)
- MSU1
- S-DD1
- SA1
- Super FX

A unique feature to this module(at the current time) is optional 1-frame speculative execution, disabled by default, controlled by the "snes_faust.spex" setting. Enabling it will reduce input(controller)->output(video) latency by 1 video frame(~16.7ms), with no deleterious effects on most games tested(though it will increase CPU usage a bit). Combine it with the setting changes recommended here for a better netplay experience.

To boost performance on underpowered multi-CPU-core platforms, enable multi-threaded rendering by changing the setting "snes_faust.renderer" to "mt". If emulation is then still marginally too slow to run fullspeed, additional performance with the multi-threaded renderer can sometimes be obtained by manually specifying CPU affinity with settings "snes_faust.affinity.ppu" and "affinity.emu"; such as with values "0x1" and "0x2", respectively(or vice-versa), on a dual-core system, or "0x3" and "0xC" for quad-core. There are also settings "affinity.video", "snes_faust.affinity.msu1.audio", and "snes_faust.affinity.msu1.data", for more advanced tinkering. However, keep in mind that it's *very* easy to massively hurt performance by specifying sub-optimal CPU affinities.

## Settings Reference

Caution: Any settings that change emulation behavior as seen from the emulated game are shown with the setting name bolded in the table. One should be conscious of these settings if one has changed them from the default values when using network play or movies, as they can cause desychronizations if not set the same among hosts(or between the recording emulator and the playing emulator).

Setting: | Value Type: | Possible Values: | Default Value: | Description:
--- | --- | --- | --- | ---
snes_faust.affinity.msu1.audio | integer | 0x0000000000000000 through 0xFFFFFFFFFFFFFFFF | 0 | MSU1 audio read thread CPU affinity mask. Set to 0 to disable changing affinity.
snes_faust.affinity.msu1.data | integer | 0x0000000000000000 through 0xFFFFFFFFFFFFFFFF | 0 | MSU1 data read thread CPU affinity mask. Set to 0 to disable changing affinity.
snes_faust.affinity.ppu | integer | 0x0000000000000000 through 0xFFFFFFFFFFFFFFFF | 0 | PPU rendering thread CPU affinity mask. Set to 0 to disable changing affinity.
snes_faust.correct_aspect | enum | 0 1 force_ntsc force_pal | 1 | Correct aspect ratio. 0 - Disabled 1 - Enabled force_ntsc - Enabled, force NTSC PAR. force_pal - Enabled, force PAL PAR.
snes_faust.cx4.clock_rate | integer | 100 through 500 | 100 | CX4 clock rate, specified in percentage of normal. Overclocking the CX4 will cause or worsen attract mode desynchronization.
snes_faust.h_filter | enum | none 512 phr256blend phr256blend_auto512 phr256blend_512 512_blend | none | Horizontal blending/doubling filter. none - None 512 - Force 512. Double width of line if it's 256. phr256blend - Pseudo-hires halve-blend. Blend line down to 256 pixels if it's pseudo-hires. phr256blend_auto512 - Pseudo-hires halve-blend and force 512 if necessary. Blend line down to 256 pixels if it's pseudo-hires. After, double width of line if any other lines use hires mode. phr256blend_512 - Pseudo-hires halve-blend and force 512. Blend line down to 256 pixels if it's pseudo-hires. After, double width of line if it's 256. 512_blend - Force 512 and blend. Double width of line if it's 256. After, blend line.
snes_faust.input.mouse_sensitivity | real | through | 0.50 | Emulated mouse sensitivity.
snes_faust.input.port1 | enum | none gamepad mouse | gamepad | Input device for Virtual Port 1 none - none gamepad - Gamepad mouse - Mouse
snes_faust.input.port2 | enum | none gamepad mouse | gamepad | Input device for Virtual Port 2 none - none gamepad - Gamepad mouse - Mouse
snes_faust.input.port3 | enum | none gamepad mouse | gamepad | Input device for Virtual Port 3 none - none gamepad - Gamepad mouse - Mouse
snes_faust.input.port4 | enum | none gamepad mouse | gamepad | Input device for Virtual Port 4 none - none gamepad - Gamepad mouse - Mouse
snes_faust.input.port5 | enum | none gamepad mouse | gamepad | Input device for Virtual Port 5 none - none gamepad - Gamepad mouse - Mouse
snes_faust.input.port6 | enum | none gamepad mouse | gamepad | Input device for Virtual Port 6 none - none gamepad - Gamepad mouse - Mouse
snes_faust.input.port7 | enum | none gamepad mouse | gamepad | Input device for Virtual Port 7 none - none gamepad - Gamepad mouse - Mouse
snes_faust.input.port8 | enum | none gamepad mouse | gamepad | Input device for Virtual Port 8 none - none gamepad - Gamepad mouse - Mouse
snes_faust.input.sport1.multitap | boolean | 0 1 | 0 | Enable multitap on SNES port 1.
snes_faust.input.sport2.multitap | boolean | 0 1 | 0 | Enable multitap on SNES port 2.
snes_faust.msu1.resamp_quality | integer | 0 through 5 | 4 | MSU1 sound quality. Higher values correspond to better SNR and better preservation of higher frequencies("brightness"), at the cost of increased computational complexity and a negligible increase in latency. Higher values will also slightly increase the probability of sample clipping(relevant if Mednafen's volume control settings are set too high), due to increased (time-domain) ringing.
snes_faust.region | enum | auto ntsc pal ntsc_lie_auto pal_lie_auto ntsc_lie_pal pal_lie_ntsc | auto | Region of SNES to emulate. auto - Auto ntsc - NTSC(North America/Japan) pal - PAL(Europe) ntsc_lie_auto - NTSC, but PPU bit as if "auto". pal_lie_auto - PAL, but PPU bit as if "auto". ntsc_lie_pal - NTSC, but PPU bit as if PAL. pal_lie_ntsc - PAL, but PPU bit as if NTSC.
snes_faust.renderer | enum | st mt | st | PPU renderer. If you have only one CPU with one physical CPU core, select the single-threaded renderer for better performance. st - Single-threaded PPU rendering is performed in the main emulation thread. mt - Multi-threaded PPU rendering is performed in a dedicated thread.
snes_faust.resamp_quality | integer | 0 through 5 | 3 | Sound quality. Higher values correspond to better SNR and better preservation of higher frequencies("brightness"), at the cost of increased computational complexity and a negligible increase in latency. Higher values will also slightly increase the probability of sample clipping(relevant if Mednafen's volume control settings are set too high), due to increased (time-domain) ringing.
snes_faust.resamp_rate_error | real | 0.0000001 through 0.0015 | 0.000035 | Sound output rate tolerance. Lower values correspond to better matching of the output rate of the resampler to the actual desired output rate, at the expense of increased RAM usage and poorer CPU cache utilization.
snes_faust.slend | integer | 0 through 223 | 223 | Last displayed scanline in NTSC mode.
snes_faust.slendp | integer | 0 through 238 | 238 | Last displayed scanline in PAL mode.
snes_faust.slstart | integer | 0 through 223 | 0 | First displayed scanline in NTSC mode.
snes_faust.slstartp | integer | 0 through 238 | 0 | First displayed scanline in PAL mode.
snes_faust.spex | boolean | 0 1 | 0 | Enable 1-frame speculative execution for video output. Hack to reduce input->output video latency by 1 frame. Enabling will increase CPU usage, and may cause video glitches(such as "jerkiness") in some oddball games, but most commercially-released games should be fine.
snes_faust.spex.sound | boolean | 0 1 | 1 | Enable speculative execution for sound output too. Only has an effect when speculative-execution for video output is enabled. Will cause minor sound glitches in some games.
snes_faust.superfx.clock_rate | integer | 25 through 500 | 100 | Super FX clock rate, specified in percentage of normal. Overclocking the Super FX will cause or worsen attract mode desynchronization.
snes_faust.superfx.icache | boolean | 0 1 | 0 | Enable SuperFX instruction cache emulation. Enabling will likely increase CPU usage.

Setting: | Value Type: | Possible Values: | Default Value: | Description:
--- | --- | --- | --- | ---
snes_faust.enable | boolean | 0 1 | 1 | Enable (automatic) usage of this module.
snes_faust.forcemono | boolean | 0 1 | 0 | Force monophonic sound output.
snes_faust.scanlines | integer | -100 through 100 | 0 | Enable scanlines with specified opacity. Opacity is specified in %; IE a value of "100" will give entirely black scanlines. Negative values are the same as positive values for non-interlaced video, but for interlaced video will cause the scanlines to be overlaid over the previous(if the "video.deinterlacer" setting is set to "weave", the default) field's lines.
snes_faust.shader | enum | none autoip autoipsharper scale2x sabr ipsharper ipxnoty ipynotx ipxnotysharper ipynotxsharper goat | none | Enable specified OpenGL shader. Obviously, this will only work with the OpenGL "video.driver" setting, and only on cards and OpenGL implementations that support shaders, otherwise you will get a black screen, or Mednafen may display an error message when starting up. When a shader is enabled, the "snes_faust.videoip" setting is ignored. none - None/Disabled autoip - Auto Interpolation Will automatically interpolate on each axis if the corresponding effective scaling factor is not an integer. autoipsharper - Sharper Auto Interpolation Same as "autoip", but when interpolation is done, it is done in a manner that will reduce blurriness if possible. scale2x - Scale2x sabr - SABR v3.0 GPU-intensive. ipsharper - Sharper bilinear interpolation. ipxnoty - Linear interpolation on X axis only. ipynotx - Linear interpolation on Y axis only. ipxnotysharper - Sharper version of "ipxnoty". ipynotxsharper - Sharper version of "ipynotx". goat - Simple approximation of a color TV CRT look. Intended for fullscreen modes with a vertical resolution of around 1000 to 1500 pixels. Doesn't simulate halation and electron beam energy distribution nuances.
snes_faust.shader.goat.fprog | boolean | 0 1 | 0 | Force interlaced video to be treated as progressive. When disabled, the default, the "video.deinterlacer" setting is effectively ignored with respect to what appears on the screen, unless it's set to "blend" or "blend_rg". When enabled, it may be prudent to disable the scanlines effect controlled by the "snes_faust.shader.goat.slen" setting, or else the scanline effect may look objectionable.
snes_faust.shader.goat.hdiv | real | -2.00 through 2.00 | 0.50 | Constant RGB horizontal divergence.
snes_faust.shader.goat.pat | enum | goatron borg slenderman | goatron | Mask pattern. goatron - Goatron Brightest. borg - Borg Darkest. slenderman - Slenderman Spookiest?
snes_faust.shader.goat.slen | boolean | 0 1 | 1 | Enable scanlines effect.
snes_faust.shader.goat.tp | real | 0.00 through 1.00 | 0.50 | Transparency of otherwise-opaque mask areas.
snes_faust.shader.goat.vdiv | real | -2.00 through 2.00 | 0.50 | Constant RGB vertical divergence.
snes_faust.special | enum | none hq2x hq3x hq4x scale2x scale3x scale4x 2xsai super2xsai supereagle nn2x nn3x nn4x nny2x nny3x nny4x | none | Enable specified special video scaler. The destination rectangle is NOT altered by this setting, so if you have xscale and yscale set to "2", and try to use a 3x scaling filter like hq3x, the image is not going to look that great. The nearest-neighbor scalers are intended for use with bilinear interpolation enabled, for a sharper image, though the "autoipsharper" shader may provide better results. none - None/Disabled hq2x - hq2x hq3x - hq3x hq4x - hq4x scale2x - scale2x scale3x - scale3x scale4x - scale4x 2xsai - 2xSaI super2xsai - Super 2xSaI supereagle - Super Eagle nn2x - Nearest-neighbor 2x nn3x - Nearest-neighbor 3x nn4x - Nearest-neighbor 4x nny2x - Nearest-neighbor 2x, y axis only nny3x - Nearest-neighbor 3x, y axis only nny4x - Nearest-neighbor 4x, y axis only
snes_faust.stretch | enum | 0 full aspect aspect_int aspect_mult2 | aspect_mult2 | Stretch to fill screen. 0 - Disabled full - Full Full-screen stretch, disregarding aspect ratio. aspect - Aspect Preserve Full-screen stretch as far as the aspect ratio(in this sense, the equivalent xscalefs == yscalefs) can be maintained. aspect_int - Aspect Preserve + Integer Scale Full-screen stretch, same as "aspect" except that the equivalent xscalefs and yscalefs are rounded down to the nearest integer. aspect_mult2 - Aspect Preserve + Integer Multiple-of-2 Scale Full-screen stretch, same as "aspect_int", but rounds down to the nearest multiple of 2.
snes_faust.tblur | boolean | 0 1 | 0 | Enable video temporal blur(50/50 previous/current frame by default).
snes_faust.tblur.accum | boolean | 0 1 | 0 | Accumulate color data rather than discarding it.
snes_faust.tblur.accum.amount | real | 0 through 100 | 50 | Blur amount in accumulation mode, specified in percentage of accumulation buffer to mix with the current frame.
snes_faust.videoip | enum | 0 1 x y | 1 | Enable (bi)linear interpolation. 0 - Disabled 1 - Bilinear x - Linear (X) Interpolation only on the X axis. y - Linear (Y) Interpolation only on the Y axis.
snes_faust.xres | integer | 0 through 65536 | 0 | Full-screen horizontal resolution. A value of "0" will cause the current desktop horizontal resolution to be used.
snes_faust.xscale | real | 0.01 through 256 | 3.000000 | Scaling factor for the X axis in windowed mode.
snes_faust.xscalefs | real | 0.01 through 256 | 1.000000 | Scaling factor for the X axis in fullscreen mode. For this setting to have any effect, the "snes_faust.stretch" setting must be set to "0".
snes_faust.yres | integer | 0 through 65536 | 0 | Full-screen vertical resolution. A value of "0" will cause the current desktop vertical resolution to be used.
snes_faust.yscale | real | 0.01 through 256 | 3.000000 | Scaling factor for the Y axis in windowed mode.
snes_faust.yscalefs | real | 0.01 through 256 | 1.000000 | Scaling factor for the Y axis in fullscreen mode. For this setting to have any effect, the "snes_faust.stretch" setting must be set to "0".