Hi, according to http://sites.inka.de/~W1752/tv/tvout.html the trick to boot without monitor attached and then stay in BIOS modes (e.g. using VESA modes, not Linux lowlevel drivers) to stay in TV-out mode is quite common. For Voodoo3, some i2c bus is mentioned which configures the port.
A full explanation for Linux can be found here: http://www.guru-group.fi/~too/tvout-voodoo3-3000-xfree You use lm_sensors-2.5.5 and i2c-2.5.5 or newer... The kernel needs i2c "i2c support", "i2c bit banging" and "i2c devices", and you need the usual 3dfx stuff (agpart, DRI, 3dfx banshee/Voodoo3+). You also need a mode which a TV can understand, e.g.: ModeLine "640x480PAL" 29.50 640 675 678 944 480 530 535 625 ModeLine "800x600PAL" 36.00 800 818 820 960 600 653 655 750 Some DOS tools should be able to process those, but I guess once you enabled TV mode, the BIOS will take care to use TV compatible refresh rates. The sensors-detect tool will find the i2c-voodoo3 thing and possibly the PiiX of your motherboard, for which you can add driver modules. It would also detect the i2c chips w83781d and generic eeprom... For Voodoo, only i2c-core, i2c-algo-bit and i2c-voodoo3 are needed... You also enable a bt869 module for the TV modulator... But you have to enable something in the chip, e.g. /proc/sys/dev/sensors/bt869-i2c-0-44 which involves test screen, bit per pixel, ntsc/pal, resolution and status stuff... For some reason, turning colorbars (test screen) on and off seems to get the chip into sane state... Summary: # /sbin/modprobe -v i2c-voodoo3 # /sbin/modprobe -v bt869 # echo 800 600 > /proc/sys/dev/sensors/bt869*/res # echo 0 > /proc/sys/dev/sensors/bt869*/ntsc # cat /proc/sys/dev/sensors/bt869*/colorbars (reading colorbars status seems to be enough...) To get anything useful out of this DOS wise, you will have to find some i2c editing or diagnostics tool. You might even need some BT869 driver. But hey, you are an experienced DOS and google user I assume ;-). Hopefully some people on this list have experience with BT869 or i2c and can send some more hints. Eric ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
