Source of PC-9800

[[NEC]]

- How many files(0-15)?とは [PC98]
--  ttp://island.geocities.jp/cklouch/column/pc98bas/howmanyfiles.htm (https://web.archive.org/web/20141110042842/http://island.geocities.jp/cklouch/column/pc98bas/howmanyfiles.htm web archive]) | ([http://awm.jp/~yoya/cache/island.geocities.jp/cklouch/column/pc98bas/howmanyfiles.htm cache])