| Variable Name | Defines | Valid Values |
| channel | The Parallax video input or output channel to use for the signal carrier | PLX_INPUT_0 (D for input, port#1) PLX_INPUT_1 (Input port #2 on XVideo-VIO/RGB/XTRA/XVC-700) PLX_IO_OFF (D for output, turn output off) PLX_OUTPUT_0 (Output port on XVideo-VIO/RGB/XTRA/XVC-700) |
| format | The analog-to-digital signal conversion format to use when digitizing the signal | PLX_COMP (D--composite) PLX_YC (SuperVHS) PLX_RGB (RGB Component) PLX_YUV (YUV Component) |
| nvselect | The location of the non-volatile RAM which contains color values to be applied to an X window. | USER_0 (user preferences stored in NVRAM location "0") USER_1 (user preferences stored in NVRAM location "1") FACTORY (D for new board; factory settings) |
| plx_hardware | The hardware in use. | PLX_VIDEO_24 (D--only available hardware type) |
| standard | The broadcast standard that the analog signal conforms to. | PLX_NTSC (D--US standard) PLX_PAL (European standard) PLX_SECAM (French standard, also used in Russia; unsupported) |
| unsigned b | The height of the blanking interval. | For NTSC: 21 lines/field For PAL: 26 lines/field |
| unsigned h | The height of the viewable portion of the video signal. | For NTSC: 525 pixels For PAL: 625 pixels |
| unsigned interlaced | The interlace indicator. | 0 (FALSE=noninterlaced) or 1 (TRUE=interlaced; D) |
| unsigned r | The frame display rate. | For NTSC: 60 Hz For PAL: 50 Hz |
| unsigned sync_ok | The sync_ok indicator. | 0 (FALSE=signal not in sync) or 1 (TRUE=signal in sync; D) |
| unsigned w | The width of the video signal. | For NTSC: 640 pixels For PAL: 768 pixels |