RWAP - PSET isn't being used as a function as such, that's how the LINE command is used on the Dragon/COCO (PSET - set pixel,PRESET - reset pixel !), which is what made me think of that first!
As RWAP said, it was probably just made up !
It seems to be drawing a polygon but I don't ever recall seeing a graphic function in a variant of BASIC looking like that. So couple of possibilities(?)
1. It's a polygon drawing command with a bit of a weird syntax (all the parameters separated by dashes or similar)
2. It's user subproc in a language of BASIC that allows proper procedure names and accepts weird parameter lists
3. It's all made-up.
We've established it's not MSX BASIC, I'm pretty sure it isn't HuBASIC from the X1 and it doesn't appear to be X-BASIC on the X68000.
Any other ideas?
HuBASIC does have a line command which accepts parameters in a similar fashion e.g. LINE(x1,y1)-(x2,y2) so I'll double check.
Can't find a suitable reference to a reserved word of CONNECT in HuBASIC. However, the coordinates in the OP do indicate a later machine than I'm trying on (better resolution) so none of this is conclusive. There were a few later variants of HuBASIC and I don't have all of them to check with.
Here's a part of picture out of the video: http://s7.postimg.org/72pyyf3hn/Picture_7.png
Someone mentioned to me that they thought the "|" is a ":"...
(The video is from 1992 btw.)
Also, the code won't have been made up, because the organizers of the contest tried it themselves.
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A ' is being used to indicate a REMark (some BASICs only use REM or another symbol) and any text that follows is ignored when the program is run. So the vertical lines after the ' could well be | symbols.
And it is not easy to make out 1's, I's etc.