This is TeX, WAITS Version 1.3 (preloaded format=plain 85.4.12) 12 APR 1985 23:41
**\show\o
*\input testfont
(TESTFO.TEX[CM,DEK]
\m=\count25
\n=\count26
\p=\count27
\dim=\dimen16
Name of the font to test = amr10
Now type a test command (\help for help):)
*\show\o
> \o=\char"1C.
<*> \show\o
?
*\o
*\bye
[1]
Output written on TEXPUT.DVI[CM,DEK] (1 page, 288 bytes).