ja-jlatex209-a17- is the last version of ASCII JTeX based on LaTeX 209.

ASCII jtex-1.7-p1.0.9F is available by this package.
Names of commads are shown below:
'ajtex',   'jtex'   -> ascii ptex
'ajlatex', 'jlatex' -> ascii platex

EUC & JIS kanji code is available by default. 
SJIS & JIS code will be available after recompiling with ports.