RCX 1.0 (!!): how to disable or delay the "auto power-off" function

Hi to all,

I'm seeking help for something which could seem anachronistic, but that's it.
I used my old RCX 1.0 (programmed with NQC) to power and control a "3S"
detachable cableway.
Hereunder I post some link to a couple of youtube movies.

http://www.youtube.com/watch?v=Ag3gnFxwwf0&eurl=http://www.funiforum.org/funiforum/showthread.php%3Ft%3D6254&feature=player_embedded

http://www.youtube.com/watch?v=RWqM-abdIpg&feature=fvw

http://www.youtube.com/watch?v=MCJpPUcPJqo&feature=related

The problem is, after running 10 minutes or so (I actually didn't take the exact
time), the RCX shuts down - I mean - the display goes blank, everything stops.

I read somewhere, e.g. in the PHilo's site, that a "power off delay" parameter
can be set long enough to avoid such issues, but I actually couldnt find where
this parameter is.

Could you please give me some hint? I am quite much a newbye.

Thanks a lot!
SteP