PC-FX Documentation

Last updated March 19, 2024
Valid as of 1.32.1

Table of Contents:

Introduction
Firmware/BIOS
Default Key Assignments
Settings Reference

Introduction

Internal backup memory and external backup memory are emulated.
Motion decoder RLE and JPEG-like modes are emulated.
KING Background 0 scaling+rotation mode is supported.
Mouse emulation.
Working CD+G playback.

Firmware/BIOS

Place a correct BIOS image file in the correct location.

The filename listed below is per default pcfx.bios setting.

Filename:	Purpose:	SHA-256 Hash:
pcfx.rom	PC-FX BIOS version 1.00. Recommended BIOS version.	4b44ccf5d84cc83daa2e6a2bee00fdafa14eb58bdf5859e96d8861a891675417

Default Key Assignments

Key(s):	Action:	Configuration String:
ALT + SHIFT + 1	Activate in-game input configuration process for device on virtual input port 1.	input_config1
ALT + SHIFT + 2	Activate in-game input configuration process for device on virtual input port 2.	input_config2

Key:	Action/Button:
Keypad 4	IV
Keypad 5	V
Keypad 6	VI
Keypad 1	III
Keypad 2	II
Keypad 3	I
Keypad 8	MODE 1
Keypad 9	MODE 2
Enter/Return	Run
Tab	Select
W	Up
S	Down
A	Left
D	Right

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:
pcfx.adpcm.emulate_buggy_codec	boolean	0 1	0	Hack that emulates the codec a buggy ADPCM encoder used for some games' ADPCM.

pcfx.adpcm.suppress_channel_reset_clicks	boolean	0 1	1	Hack to suppress clicks caused by forced channel resets.

pcfx.bios	string		pcfx.rom	Path to the ROM BIOS

pcfx.cdspeed	integer	2 through 10	2	Emulated CD-ROM speed. Setting the value higher than 2, the default, will decrease loading times in most games by some degree.

pcfx.cpu_emulation	enum	fast accurate auto	auto	CPU emulation mode. fast - Fast Mode Fast mode trades timing accuracy, cache emulation, and executing from hardware registers and RAM not intended for code use for performance. accurate - Accurate Mode Increased timing accuracy, though not perfect, along with cache emulation, at the cost of decreased performance. Additionally, even the pipeline isn't correctly and fully emulated in this mode. auto - Auto Mode Selects "fast" or "accurate" automatically based on an internal database. If the CD image is not recognized, defaults to "fast".

pcfx.disable_bram	boolean	0 1	0	Disable internal and external BRAM. It is intended for viewing games' error screens that may be different from simple BRAM full and uninitialized BRAM error screens, though it can cause the game to crash outright.

pcfx.disable_softreset	boolean	0 1	0	When RUN+SEL are pressed simultaneously, disable both buttons temporarily.

pcfx.fxscsi	string		0	Path to the FX-SCSI ROM Intended for developers only.

pcfx.high_dotclock_width	enum	256 341 1024	1024	Emulated width for 7.16MHz dot-clock mode. Lower values are faster, but will cause some degree of pixel distortion. 256 - 256 pixels This value will cause heavy pixel distortion. 341 - 341 pixels This value will cause moderate pixel distortion. 1024 - 1024 pixels This value will cause no pixel distortion as long as interpolation is enabled on the video output device and the resolution is sufficiently high, but it will use a lot of CPU time.

pcfx.input.port1	enum	none gamepad mouse	gamepad	Input device for Port 1 none - none gamepad - Gamepad mouse - Mouse

pcfx.input.port1.multitap	boolean	0 1	0	Enable multitap on PC-FX port 1. EXPERIMENTAL emulation of the unreleased multitap. Enables ports 3 4 5.

pcfx.input.port2	enum	none gamepad mouse	gamepad	Input device for Port 2 none - none gamepad - Gamepad mouse - Mouse

pcfx.input.port2.multitap	boolean	0 1	0	Enable multitap on PC-FX port 2. EXPERIMENTAL emulation of the unreleased multitap. Enables ports 6 7 8.

pcfx.input.port3	enum	none gamepad mouse	gamepad	Input device for Port 3 none - none gamepad - Gamepad mouse - Mouse

pcfx.input.port4	enum	none gamepad mouse	gamepad	Input device for Port 4 none - none gamepad - Gamepad mouse - Mouse

pcfx.input.port5	enum	none gamepad mouse	gamepad	Input device for Port 5 none - none gamepad - Gamepad mouse - Mouse

pcfx.input.port6	enum	none gamepad mouse	gamepad	Input device for Port 6 none - none gamepad - Gamepad mouse - Mouse

pcfx.input.port7	enum	none gamepad mouse	gamepad	Input device for Port 7 none - none gamepad - Gamepad mouse - Mouse

pcfx.input.port8	enum	none gamepad mouse	gamepad	Input device for Port 8 none - none gamepad - Gamepad mouse - Mouse

pcfx.mouse_sensitivity	real	through	1.25	Mouse sensitivity.

pcfx.nospritelimit	boolean	0 1	0	Remove 16-sprites-per-scanline hardware limit.

pcfx.rainbow.chromaip	boolean	0 1	0	Enable bilinear interpolation on the chroma channel of RAINBOW YUV output. This is an enhancement-related setting. Enabling it may cause graphical glitches with some games.

pcfx.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.

pcfx.resamp_rate_error	real	0.0000001 through 0.0000350	0.0000009	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.

pcfx.slend	integer	0 through 239	235	Last rendered scanline.

pcfx.slstart	integer	0 through 239	4	First rendered scanline.

Setting:	Value Type:	Possible Values:	Default Value:	Description:
pcfx.debugger.disfontsize	enum	5x7 6x9 6x12 6x13 9x18	5x7	Disassembly font size. Note: Setting the font size to larger than the default may cause text overlap in the debugger. 5x7 - 5x7 6x9 - 6x9 6x12 - 6x12 6x13 - 6x13. CJK support. 9x18 - 9x18; CJK support.

pcfx.debugger.memcharenc	string		shift_jis	Character encoding for the debugger's memory editor.

pcfx.enable	boolean	0 1	1	Enable (automatic) usage of this module.

pcfx.forcemono	boolean	0 1	0	Force monophonic sound output.

pcfx.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.

pcfx.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 "pcfx.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.

pcfx.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 "pcfx.shader.goat.slen" setting, or else the scanline effect may look objectionable.

pcfx.shader.goat.hdiv	real	-2.00 through 2.00	0.50	Constant RGB horizontal divergence.

pcfx.shader.goat.pat	enum	goatron borg slenderman	goatron	Mask pattern. goatron - Goatron Brightest. borg - Borg Darkest. slenderman - Slenderman Spookiest?

pcfx.shader.goat.slen	boolean	0 1	1	Enable scanlines effect.

pcfx.shader.goat.tp	real	0.00 through 1.00	0.50	Transparency of otherwise-opaque mask areas.

pcfx.shader.goat.vdiv	real	-2.00 through 2.00	0.50	Constant RGB vertical divergence.

pcfx.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

pcfx.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.

pcfx.tblur	boolean	0 1	0	Enable video temporal blur(50/50 previous/current frame by default).

pcfx.tblur.accum	boolean	0 1	0	Accumulate color data rather than discarding it.

pcfx.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.

pcfx.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.

pcfx.xres	integer	0 through 65536	0	Full-screen horizontal resolution. A value of "0" will cause the current desktop horizontal resolution to be used.

pcfx.xscale	real	0.01 through 256	3.000000	Scaling factor for the X axis in windowed mode.

pcfx.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 "pcfx.stretch" setting must be set to "0".

pcfx.yres	integer	0 through 65536	0	Full-screen vertical resolution. A value of "0" will cause the current desktop vertical resolution to be used.

pcfx.yscale	real	0.01 through 256	3.000000	Scaling factor for the Y axis in windowed mode.

pcfx.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 "pcfx.stretch" setting must be set to "0".

PC-FX Documentation

Introduction

Firmware/BIOS

Default Key Assignments

Settings Reference