わたなべです.

原さん:
:私もこの同じ環境で（QEMM 7.5 の DPMI サーバーで）動かして
:同じ結果でした。

djgppfaq によるとこういうことらしいです.

> Another DPMI host which is known to cause problems in
> DJGPP is Quarterdeck's QDPMI which comes with QEMM 7.5.
> It was reported to cause `Info' and all DJGPP debuggers to
> crash. If you use QDPMI, upgrade to the version 7.53 or
> later (patches for that version are available from the
> Quarterdeck's ftp site), or disable QDPMI and use CWSDPMI.

-- 
わたなべひろふみ