On 1 mrt 2011, at 20:21, Wolfgang Schuster wrote:

> \setupinterlinespace[line=0.5mm] or use MetaPost (not sure what do you want).

This does work out as I want it. The aim is to place lines of smallblocks, 
taken from an input file
\startdvbscreen
  \startdvbline
        \blok{colorvalue} % FORGET COLOR FOR NOW
        ....
  \stopdvbline
  ....
\stopdvbscreen

\def\blokheight{0.15mm}\def\blokwidth{0.19mm}
\def\blok{\vrule width \blokwidth height \blokheight depth 0pt\ignorespaces}
\def\startdvbline{}
\def\stopdvbline{\crlf\vskip-0.3mm}
\def\startdvbscreen{SEE BELOW}
\def\stopdvbscreen{\crlf\vskip4mm\stop}

works with minimal fontsize, but the lines are not easily to get exactly tight 
in vertical sense (kludge with vskip of -0.3mm).
thus works a bit:
\def\startdvbscreen{DVB-screen\crlf\start\setupinterlinespace[line=0.5mm]}
does not work:
\def\startdvbscreen{DVB-screen\crlf\start\switchtobodyfont[0.1pt]}
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