# extra vertical space in edge

i wrote this code to get output without margin spaces. but i saw there is some extra vertical space between charater A and up edge of pdf file. 1 inch vertical and horizontal extra space is the default margin space in PDFTeX.

is that a bug for plain tex?

You're missing `\topskip`:

``````\voffset=-1in
\hoffset=-1in
\parindent=0pt
\topskip=0pt

A
\bye
``````

``````\pdfhorigin=0pt
``````\pdfvariable horigin 0pt