AXCEL216 / MDGx 3dfx Voodoo + Voodoo2 Environment Variables

3dfx Voodoo + Voodoo2
Environment Variables

Voodoo Variables | Voodoo2 Variables

Credits:
• Compiled by E. K. Lee [Voodoo variables] + Daron Myrick [Voodoo2 variables].
• Similar: 3dfx Voodoo + Voodoo2 Environment Variables.
• This list is incomplete. These variables are NOT supported. You are the ONLY one responsible for ANY damage due to incorrect use.
3dfx Drivers + Tools:
• 3dfx Voodoo2 Direct3D/OpenGL/Glide/SLI Tweaked Unofficial Drivers for Windows 95/98/ME based on Official 3dfx Drivers 3.02.02 [1.33 MB].
• 3dfx MiniGL 1.47, 1.48 + 1.49 Drivers [293 KB].
• 3dfx Zone 3dfx tweaked Video Drivers.
• 3dfx Drivers, Tools + Resources.
• KoolSmoky 3dfx tweaked Video Drivers.
• Voodoo Files 3dfx Video Drivers + Tools.
3dfx Games + Tools:
• 3dfx Drivers + Games BUGs & FIXes.
• 3dfx Voodoo3, Banshee + Tomb Raider I Guide.
• Tomb Raider I + GlideOS Guide.
• Stella's Tomb Raider.
• OpenGlide [free GPL].
• GlideXP [free GPL].
• Glide Wrapper [free].
• GlideOS [shareware :(].
• VDos32 [unlockable freeware :(].
• DOSBox [free GPL].
• VDMSound [free GPL].
• DOS games supporting 3dfx Voodoo chipsets.
3dfx Review:
• Quantum3D Obsidian2 X-24 Voodoo2 SLI PCI controller.
3dfx Bench:
• Quantum3D Obsidian2 X-24 Voodoo2 SLI Benchmarks.
Info:
• 3D AXCELerated Video: 3D Chipsets + Controllers Info + News.

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Voodoo Variables

Variable Default Value Possible Values Description
FX_CPU
FX_GLIDE_BOUNDS_CHECK
FX_GLIDE_LWM
FX_GLIDE_NO_SPLASH 0 0 or 1 1 = Disable 3dfx logo animation.
FX_GLIDE_SHAMELESS_PLUG 0 or 1 Enables display of a static 3dfx logo upon Glide initialization.
FX_GLIDE_SNAPSHOT
FX_GLIDE_SST2
FX_GLIDE_SWAPINTERVAL 1 (?) 0 / 1 / 2 0 = off (might improve performance). 0 to swap back buffer/front buffer ASAP, 1 to swap on Vsync, 2 to swap every two Vsyncs.
GV_ENV_GAMMA
GV_ENV_TEXTURE_SQUARE_STATE
SST_ARCADE
SST_BACKPORCH
SST_BGAMMA 0 to 1.95 Adjusts Blue Gamma.
SST_BOARDS Allows several Voodoo boards to be used in one system, across several monitors acting as one big monitor/screen.
SST_DEBUGDAC 0 (off) 0 or 1 Displays DAC debug information
0 = off / 1 = on.
SST_DIMENSIONS
SST_DUALHEAD 0 (off) 0 or 1 Enable dual monitor support.
0 = off / 1 = on.
SST_FASTMEM 0 (off) 0 or 1 Enables fast DRAM and EDO settings.
0 = off / 1 = on.
SST_FASTPCIRD 0 (off) 0 or 1 Enables Fast PCI read, subtract wait states on PCI reads. (Voodoo -> PCI)
0 = off / 1 = on.
SST_FBICFG Frame Buffer Interface config register. Set Gouraud types etc.
SST_FBIMEM_SIZE Amount of RAM in KB. (?) Amount of Frame Buffer RAM installed. Overrides autodetect by Glide.
SST_FT_CLK_DEL Speed at which Frame Buffer memory can be accessed.
SST_GAMMA 0 to 1.95 Adjusts global gamma.
SST_GGAMMA 0 to 1.95 Adjusts Green Gamma.
SST_GRXCLK 50 Set graphic clock rate in MHz. Speeds up to 75 MHz have been reported, but 57 MHz is most common.
Beware ! Can cause damage !
SST_HSYNC 0 (off) 0 or 1 Enable Horizontal sync.
0 = off / 1 = on.
SST_IGNORE_INIT_REGISTERS 0 (off) 0 or 1 Allows initializing the Voodoo Chipset, even if the Voodoo is already initialized. This is good to init the chipset after an abnormal program termination.
0 = off / 1 = on.
SST_IGNORE_INIT_VIDEO
SST_IGNORE_SLI_CHECK 0 (off) 0 or 1 Ignores autodetect of slave frame buffer chip for speed doubling.
0 = off / 1 = on.
SST_INITDEBUG 0 0 or 1 Enables displaying of Glide debug information in DOS shell.
0 = off / 1 = on.
SST_INITDEBUG_FILE Valid Filenames Instead of displaying the info on screen, Glide writes the info to the specified file.
SST_MEMINFO_HWM High Water Mark ? (Max Mem Usage)
SST_MEMINFO_LFB LFB Chip memory memory read/write FIFO buffer size
SST_MEMINFO_LWM Low Water Mark ? (Min Mem)
SST_MEMINFO_TEX Texture Chip memory memory read/write FIFO buffer size
SST_NODEVICEINFO
SST_NOSHUTDOWN 0 (off) 0 or 1 Do not reinitialize Voodoo (1) on program termination.
SST_PCIFIFO_LWM
SST_PCIRD 0 or 1 1 = enable Fast PCI read.
SST_PFT_CLK_DEL Preliminary (initial) speed at which the frame buffer memory can be accessed.
SST_PFT_CLK0_DEL Preliminary (initial) texture chip 0 memory access speed in delayed clocks.
SST_PFT_CLK1_DEL Preliminary (initial) texture chip 1 memory access speed in delayed clocks.
SST_PFT_CLK2_DEL Preliminary (initial) texture chip 2 memory access speed in delayed clocks.
SST_RGAMMA 0 to 1.95 Adjusts Red Gamma.
SST_SCREENREFRESH 60 60,75,85,120 Set vertical screen refresh rate in Hz.
SST_SCREENREZ Virtual screen resolution
SST_SLIDETECT Scan Line Interpolation (SLI). Detect slave Voodoo chipset subsystem.
SST_SLIM_PVOUT_CLKDEL Master frame buffer chip preliminarypixel clock delay.
SST_SLIM_VIN_CLKDEL Master video in clock delay for external sync / gen locking.
SST_SLIM_VOUT_CLKDEL Master system clock delay. Only valid if multiple FBIs and TMUs are present.
SST_SLIS_PVOUT_CLKDEL Slave frame buffer chip preliminary pixel clock delay.
SST_SLIS_VIN_CLKDEL Slave system video in clock delay (for sync to master).
SST_SLIS_VOUT_CLKDEL Slave system clock delay. Only valid if multiple FBIs and TMUs are present.
SST_SLOWPCIWR Adds wait states to PCI bus writes to Voodoo memory and I/O. (PCI -> Voodoo)
SST_SWAP_EN_WAIT_ON_VSYNC 1 0 or 1 0 = Turn of synching to the monitor's vertical refresh rate.
SST_TEXMAP_DISABLE 0 0 or 1 Disables texture mapping (1)
SST_TF0_CLK_DEL Texture chip 0 memory access in delayed clocks
SST_TF1_CLK_DEL Texture chip 1 memory access in delayed clocks
SST_TF2_CLK_DEL Texture chip 2 memory access in delayed clocks
SST_TF_FIFO_TRESH CPU/Frame Buffer Writes/Reads to the texture map memory is done through FIFO since the texture map chip might be doing something with that memory at the time. This sets texture map write/read FIFO threshold to tell Glide that FIFO needs to be serviced and then may accept more data from either frame buffer or CPU.
SST_TILESINX
SST_TMUCFG Texture Chip Direct Bitmapped Config Register. Sets Texture types, overlay etc, directly.
SST_TMUMEM_SIZE Amount of texture RAM in KB (?) Amount of texture RAM. Overrides Glide autodetect.
SST_TMUMEM
SST_TREX0INIT0 Texture Chip 0 Direct Bitmapped Primary Init Register (Glide will change the values of these registers depending on other environment variables).
SST_TREX0INIT1 Texture Chip 0 Direct Bitmapped Secondary Init Register
SST_TREX1INIT0 Texture Chip 1 Direct Bitmapped Primary Init Register
SST_TREX1INIT1 Texture Chip 1 Direct Bitmapped Secondary Init Register
SST_TREX2INIT0 Texture Chip 2 Direct Bitmapped PrimaryInit Register
SST_TREX2INIT1 Texture Chip 2 Direct Bitmapped Secondary Init Register
SST_TRIPLE_BUFFER If program does no Z or Alpha buffering, use AUX(illiary) buffer as hidden speed buffer.
SST_VFIFO_TRESH Threshold of PCI -> Voodoo frame buffer access before FIFO is to be serviced.
SST_VGA_PASS 1 0 or 1 Enable VGA pass-trough (1)
SST_VIDCLK2X
SST_VIDEO_24BPP 0 0 or 1 Enable 24-bit video mode (1)
SST_VIDEO_CLEARCOLOR 0 or 1 Color fill back buffer during a page flip. (0 = enable)
SST_VIDEO_DISABLE Disable video DAC information stream. Synching may still be active.
SST_VIDEO_FILTER_DISABLE Disable 24 -> 16-bit dithering
SST_VIDEO_FILTER_TRESHOLD 16-bit pixel value threshold, in which smoothing will be applied to inside adjacent pixels.
SST_VIDEO_NOCLEAR Don't clear back buffer during a page flip.
SST_VIN_CLKDEL Single Voodoo system video in clock delay
SST_VOUT_CLKDEL Single Voodoo system video out clock delay
SST_VSYNC 1 0 or 1 Disable vsync, may increase performance (0)

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Voodoo2 Variables

Variable Default Value Possible Values Description
FX_CPU
FX_GLIDE_ALLOC_AUX
FX_GLIDE_ALLOC_COLOR
FX_GLIDE_BOUNDS_CHECK
FX_GLIDE_HW_REV
FX_GLIDE_IGNORE_REOPEN
FX_GLIDE_LOD_DITHER
FX_GLIDE_LWM
FX_GLIDE_NO_DITHER_SUB
FX_GLIDE_NO_SPLASH 0 0 or 1 1 = Disable 3dfx logo animation.
FX_GLIDE_REPORT_REAL_HW
FX_GLIDE_SHAMELESS_PLUG 0 or 1 Enables display of a static 3dfx logo upon Glide initialization.
FX_GLIDE_SWAPINTERVAL 1 (?) 0 / 1 / 2 0 = off (might improve performance). 0 to swap back buffer/front buffer ASAP, 1 to swap on Vsync, 2 to swap every two Vsyncs.
FX_SNAPSHOT
SSTV2_ALLOC_AUX
SSTV2_ALLOC_COLOR
SSTV2_BACKPORCH
SSTV2_BGAMMA 0 to 1.95 Adjusts Blue Gamma.
SSTV2_BOARDS Allows several Voodoo boards to be used in one system, across several monitors acting as one big monitor/screen.
SSTV2_CMDFIFO_DIRECT
SSTV2_CMDFIFO_NOHOLES
SSTV2_DEBUGDAC 0 (off) 0 or 1 Displays DAC debug information
0 = off / 1 = on.
SSTV2_DEVICEID
SSTV2_DIMENSIONS
SSTV2_FASTMEM 0 (off) 0 or 1 Enables fast DRAM and EDO settings.
0 = off / 1 = on.
SSTV2_FASTPCIRD 0 (off) 0 or 1 Enables Fast PCI read, subtract wait states on PCI reads. (Voodoo -> PCI)
0 = off / 1 = on.
SSTV2_FAST_RAS_READS
SSTV2_FBICFG Frame Buffer Interface config register. Set Gouraud types etc.
SSTV2_FBI_MEMSIZE Amount RAM in KB. (?) Amount of Frame Buffer RAM installed. Overrides autodetect by Glide.
SSTV2_FORCE_BILINEAR
SSTV2_FORCE_TRILINEAR
SSTV2_FT_CLKDEL Speed at which Frame Buffer memory can be accessed.
SSTV2_GAMMA Adjusts global gamma.
SSTV2_GGAMMA Adjusts Green Gamma.
SSTV2_GRXCLK Set graphic clock rate in MHz.
Beware ! Can cause damage !
SSTV2_HSYNC 0 (off) 0 or 1 Enable Horizontal sync.
0 = off / 1 = on.
SSTV2_IGNORE_IDLE
SSTV2_IGNORE_IDLE
SSTV2_IGNORE_IDLE
SSTV2_IGNORE_INIT_REGISTERS 0 (off) 0 or 1 Allows initializing the Voodoo Chipset, even if the Voodoo is already initialized. This is good to init the chipset after an abnormal program termination.
0 = off / 1 = on.
SSTV2_IGNORE_INIT_VIDEO
SSTV2_INITDEBUG 0 0 or 1 Ignore autodetect of slave frame buffer chip for speed doubling.
0 = off / 1 = on.
SSTV2_INITDEBUG_FILE Valid File names Instead of displaying the info on screen, Glide writes the info to the specified file.
SSTV2_MEMFIFO_ENTRIES
SSTV2_MEMFIFO_HWM High Water Mark ? (Max Mem Usage)
SSTV2_MEMFIFO_LFB LFB Chip memory memory read/write FIFO buffer size
SSTV2_MEMFIFO_LWM Low Water Mark ? (Min Mem)
SSTV2_MEMFIFO_TEX Texture Chip memory memory read/write FIFO buffer size
SSTV2_MEMOFFSET
SSTV2_NODEVICEINFO
SSTV2_NOSHUTDOWN 0 (off) 0 or 1 Do not reinitialize Voodoo (1) on program termination.
SSTV2_NUM_TMUS
SSTV2_PCIFIFO_LWM
SSTV2_PFT_CLKDEL Preliminary (initial) speed at which the frame buffer memory can be accessed.
SSTV2_PTF0_CLKDEL Preliminary (initial) texture chip 0 memory access speed in delayed clocks.
SSTV2_PTF1_CLKDEL Preliminary (initial) texture chip 1 memory access speed in delayed clocks.
SSTV2_PTF2_CLKDEL Preliminary (initial) texture chip 2 memory access speed in delayed clocks.
SSTV2_REFRESH_1024x768
SSTV2_REFRESH_512x384
SSTV2_REFRESH_640x400
SSTV2_REFRESH_640x480
SSTV2_REFRESH_800x600
SSTV2_REFRESH_960x720
SSTV2_RGAMMA 0 to 1.95 Adjusts Red Gamma.
SSTV2_SCREENREFRESH Set vertical screen refresh rate in Hz.
SSTV2_SCREENREZ Virtual screen resolution
SSTV2_SIPROCESS_CNTR
SSTV2_SLIDETECT Scan Line Interpolation (SLI). Detect slave Voodoo chipset subsystem.
SSTV2_SLIM_PVOUT_CLKDEL Master frame buffer chip preliminary pixel clock delay.
SSTV2_SLIM_VIN_CLKDEL Master video in clock delay for external sync / gen locking.
SSTV2_SLIM_VOUT_CLKDEL Master system clock delay. Only valid if multiple FBIs and TMUs are present.
SSTV2_SLISWAP
SSTV2_SLIS_PVOUT_CLKDEL Slave frame buffer chip preliminary pixel clock delay.
SSTV2_SLIS_VIN_CLKDEL Slave system video in clock delay (for sync to master).
SSTV2_SLIS_VOUT_CLKDEL Slave system clock delay. Only valid if multiple FBIs and TMUs are present.
SSTV2_SLOWPCIWR
SSTV2_SWAPBOARDS
SSTV2_TEXMAP_DISABLE 0 0 or 1 Disables texture mapping (1)
SSTV2_TF0_CLKDEL Texture chip 0 memory access in delayed clocks
SSTV2_TF1_CLKDEL Texture chip 1 memory access in delayed clocks
SSTV2_TF2_CLKDEL Texture chip 2 memory access in delayed clocks
SSTV2_TF_FIFO_THRESH CPU/Frame Buffer Writes/Reads to the texture map memory is done through FIFO since the texture map chip might be doing something with that memory at the time. This sets texture map write/read FIFO threshold to tell Glide that FIFO needs to be serviced and then may accept more data from either frame buffer or CPU.
SSTV2_TILESINX
SSTV2_TMUCFG Texture Chip Direct Bitmapped Config Register. Sets Texture types, overlay etc, directly.
SSTV2_TMU_MEMSIZE Amount of texture RAM in KB (?) Amount of texture RAM. Overrides Glide autodetect.
SSTV2_TREX0INIT0 Texture Chip 0 Direct Bitmapped PrimaryInit Register (Glide will change the values of these registers depending on other environment variables).
SSTV2_TREX0INIT1 Texture Chip 0 Direct BitmappedSecondary Init Register
SSTV2_TREX1INIT0 Texture Chip 1 Direct Bitmapped Primary Init Register
SSTV2_TREX1INIT1 Texture Chip 1 Direct Bitmapped Secondary Init Register
SSTV2_TREX2INIT0 Texture Chip 2 Direct Bitmapped Primary Init Register
SSTV2_TREX2INIT1 Texture Chip 2 Direct Bitmapped Secondary Init Register
SSTV2_VFIFO_THRESH Threshold of PCI -> Voodoo frame buffer access before FIFO is to be serviced.
SSTV2_VGA_PASS 1 0 or 1 Enable VGA pass-trough (1)
SSTV2_VIDCLK2X
SSTV2_VIDEO_24BPP 0 0 or 1 Enable 24-bit video mode (1)
SSTV2_VIDEO_CLEARCOLOR 0 or 1 Color fill back buffer during a page flip. (0 = enable)
SSTV2_VIDEO_DISABLE Disable video DAC information stream. Synching may still be active.
SSTV2_VIDEO_FILTER_DISABLE Disable 24 -> 16-bit dithering
SSTV2_VIDEO_FILTER_THRESHOLD 16-bit pixel value threshold, in which smoothing will be applied to inside adjacent pixels.
SSTV2_VIDEO_NOCLEAR Don't clear back buffer during a page flip.
SSTV2_VIN_CLKDEL Single Voodoo system video in clock delay
SSTV2_VOUT_CLKDEL Single Voodoo system video out clock delay
SSTV2_VSYNC Disable vsync, may increase performance (0)
SST_DUALHEAD 0 (off) 0 or 1 Enable dual monitor support.
0 = off / 1 = on.
SST_INITDEBU 0 0 or 1 Enables displaying of Glide debug information in DOS shell.
0 = off / 1 = on.

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Variable	Default Value	Possible Values	Description
FX_CPU
FX_GLIDE_BOUNDS_CHECK
FX_GLIDE_LWM
FX_GLIDE_NO_SPLASH	0	0 or 1	1 = Disable 3dfx logo animation.
FX_GLIDE_SHAMELESS_PLUG		0 or 1	Enables display of a static 3dfx logo upon Glide initialization.
FX_GLIDE_SNAPSHOT
FX_GLIDE_SST2
FX_GLIDE_SWAPINTERVAL	1 (?)	0 / 1 / 2	0 = off (might improve performance). 0 to swap back buffer/front buffer ASAP, 1 to swap on Vsync, 2 to swap every two Vsyncs.
GV_ENV_GAMMA
GV_ENV_TEXTURE_SQUARE_STATE
SST_ARCADE
SST_BACKPORCH
SST_BGAMMA		0 to 1.95	Adjusts Blue Gamma.
SST_BOARDS			Allows several Voodoo boards to be used in one system, across several monitors acting as one big monitor/screen.
SST_DEBUGDAC	0 (off)	0 or 1	Displays DAC debug information 0 = off / 1 = on.
SST_DIMENSIONS
SST_DUALHEAD	0 (off)	0 or 1	Enable dual monitor support. 0 = off / 1 = on.
SST_FASTMEM	0 (off)	0 or 1	Enables fast DRAM and EDO settings. 0 = off / 1 = on.
SST_FASTPCIRD	0 (off)	0 or 1	Enables Fast PCI read, subtract wait states on PCI reads. (Voodoo -> PCI) 0 = off / 1 = on.
SST_FBICFG			Frame Buffer Interface config register. Set Gouraud types etc.
SST_FBIMEM_SIZE		Amount of RAM in KB. (?)	Amount of Frame Buffer RAM installed. Overrides autodetect by Glide.
SST_FT_CLK_DEL			Speed at which Frame Buffer memory can be accessed.
SST_GAMMA		0 to 1.95	Adjusts global gamma.
SST_GGAMMA		0 to 1.95	Adjusts Green Gamma.
SST_GRXCLK	50		Set graphic clock rate in MHz. Speeds up to 75 MHz have been reported, but 57 MHz is most common. Beware ! Can cause damage !
SST_HSYNC	0 (off)	0 or 1	Enable Horizontal sync. 0 = off / 1 = on.
SST_IGNORE_INIT_REGISTERS	0 (off)	0 or 1	Allows initializing the Voodoo Chipset, even if the Voodoo is already initialized. This is good to init the chipset after an abnormal program termination. 0 = off / 1 = on.
SST_IGNORE_INIT_VIDEO
SST_IGNORE_SLI_CHECK	0 (off)	0 or 1	Ignores autodetect of slave frame buffer chip for speed doubling. 0 = off / 1 = on.
SST_INITDEBUG	0	0 or 1	Enables displaying of Glide debug information in DOS shell. 0 = off / 1 = on.
SST_INITDEBUG_FILE		Valid Filenames	Instead of displaying the info on screen, Glide writes the info to the specified file.
SST_MEMINFO_HWM			High Water Mark ? (Max Mem Usage)
SST_MEMINFO_LFB			LFB Chip memory memory read/write FIFO buffer size
SST_MEMINFO_LWM			Low Water Mark ? (Min Mem)
SST_MEMINFO_TEX			Texture Chip memory memory read/write FIFO buffer size
SST_NODEVICEINFO
SST_NOSHUTDOWN	0 (off)	0 or 1	Do not reinitialize Voodoo (1) on program termination.
SST_PCIFIFO_LWM
SST_PCIRD		0 or 1	1 = enable Fast PCI read.
SST_PFT_CLK_DEL			Preliminary (initial) speed at which the frame buffer memory can be accessed.
SST_PFT_CLK0_DEL			Preliminary (initial) texture chip 0 memory access speed in delayed clocks.
SST_PFT_CLK1_DEL			Preliminary (initial) texture chip 1 memory access speed in delayed clocks.
SST_PFT_CLK2_DEL			Preliminary (initial) texture chip 2 memory access speed in delayed clocks.
SST_RGAMMA		0 to 1.95	Adjusts Red Gamma.
SST_SCREENREFRESH	60	60,75,85,120	Set vertical screen refresh rate in Hz.
SST_SCREENREZ			Virtual screen resolution
SST_SLIDETECT			Scan Line Interpolation (SLI). Detect slave Voodoo chipset subsystem.
SST_SLIM_PVOUT_CLKDEL			Master frame buffer chip preliminarypixel clock delay.
SST_SLIM_VIN_CLKDEL			Master video in clock delay for external sync / gen locking.
SST_SLIM_VOUT_CLKDEL			Master system clock delay. Only valid if multiple FBIs and TMUs are present.
SST_SLIS_PVOUT_CLKDEL			Slave frame buffer chip preliminary pixel clock delay.
SST_SLIS_VIN_CLKDEL			Slave system video in clock delay (for sync to master).
SST_SLIS_VOUT_CLKDEL			Slave system clock delay. Only valid if multiple FBIs and TMUs are present.
SST_SLOWPCIWR			Adds wait states to PCI bus writes to Voodoo memory and I/O. (PCI -> Voodoo)
SST_SWAP_EN_WAIT_ON_VSYNC	1	0 or 1	0 = Turn of synching to the monitor's vertical refresh rate.
SST_TEXMAP_DISABLE	0	0 or 1	Disables texture mapping (1)
SST_TF0_CLK_DEL			Texture chip 0 memory access in delayed clocks
SST_TF1_CLK_DEL			Texture chip 1 memory access in delayed clocks
SST_TF2_CLK_DEL			Texture chip 2 memory access in delayed clocks
SST_TF_FIFO_TRESH			CPU/Frame Buffer Writes/Reads to the texture map memory is done through FIFO since the texture map chip might be doing something with that memory at the time. This sets texture map write/read FIFO threshold to tell Glide that FIFO needs to be serviced and then may accept more data from either frame buffer or CPU.
SST_TILESINX
SST_TMUCFG			Texture Chip Direct Bitmapped Config Register. Sets Texture types, overlay etc, directly.
SST_TMUMEM_SIZE		Amount of texture RAM in KB (?)	Amount of texture RAM. Overrides Glide autodetect.
SST_TMUMEM
SST_TREX0INIT0			Texture Chip 0 Direct Bitmapped Primary Init Register (Glide will change the values of these registers depending on other environment variables).
SST_TREX0INIT1			Texture Chip 0 Direct Bitmapped Secondary Init Register
SST_TREX1INIT0			Texture Chip 1 Direct Bitmapped Primary Init Register
SST_TREX1INIT1			Texture Chip 1 Direct Bitmapped Secondary Init Register
SST_TREX2INIT0			Texture Chip 2 Direct Bitmapped PrimaryInit Register
SST_TREX2INIT1			Texture Chip 2 Direct Bitmapped Secondary Init Register
SST_TRIPLE_BUFFER			If program does no Z or Alpha buffering, use AUX(illiary) buffer as hidden speed buffer.
SST_VFIFO_TRESH			Threshold of PCI -> Voodoo frame buffer access before FIFO is to be serviced.
SST_VGA_PASS	1	0 or 1	Enable VGA pass-trough (1)
SST_VIDCLK2X
SST_VIDEO_24BPP	0	0 or 1	Enable 24-bit video mode (1)
SST_VIDEO_CLEARCOLOR		0 or 1	Color fill back buffer during a page flip. (0 = enable)
SST_VIDEO_DISABLE			Disable video DAC information stream. Synching may still be active.
SST_VIDEO_FILTER_DISABLE			Disable 24 -> 16-bit dithering
SST_VIDEO_FILTER_TRESHOLD			16-bit pixel value threshold, in which smoothing will be applied to inside adjacent pixels.
SST_VIDEO_NOCLEAR			Don't clear back buffer during a page flip.
SST_VIN_CLKDEL			Single Voodoo system video in clock delay
SST_VOUT_CLKDEL			Single Voodoo system video out clock delay
SST_VSYNC	1	0 or 1	Disable vsync, may increase performance (0)