Copyright © 1996 Frank Durda IV <uhclem@FreeBSD.ORG>, All Rights Reserved. 13 January 1996.
Ìõ: º´Çì δ»Ê <saeki@jp.FreeBSD.org>, ´äºê Ëþ <iwasaki@jp.FreeBSD.ORG>. 11 November 1996.
( ¤³¤³¤«¤é¤Ï º´Çì δ»Ê <saeki@jp.FreeBSD.org> ¤¬ËÝÌõ¤òôÅö)
ÈÆÍÑÈ󯱴üÁ÷¼õ¿®¥³¥ó¥È¥í¡¼¥é (UART) ¤Ï¥³¥ó¥Ô¥å¡¼¥¿¤Î¥·¥ê¥¢¥ëÄÌ¿® ¥µ¥Ö¥·¥¹¥Æ¥à¤Î¸°¤È¤Ê¤ëÉôÉʤǤ¹. UART ¤Ï²¿¥Ð¥¤¥È¤«¤Î¥Ç¡¼¥¿¤ò¼õ¤±¤È¤ê, ¤³¤ì¤ò 1 ¥Ó¥Ã¥È¤º¤Ä½çÈÖ¤ËÁ÷¿®¤·¤Þ¤¹. ¼õ¿®Â¦¤Ç¤Ï, ¤â¤¦°ì¤Ä¤Î UART ¤¬ ¤³¤Î¥Ó¥Ã¥ÈÎó¤ò´°Á´¤Ê¥Ð¥¤¥ÈÎó¤ËÁȤßΩ¤ÆÄ¾¤·¤Þ¤¹.
¥·¥ê¥¢¥ëžÁ÷¤Ï, ¥â¥Ç¥à¤ä¥³¥ó¥Ô¥å¡¼¥¿´Ö¤ÎÈó¥Í¥Ã¥È¥ï¡¼¥¯·¿¤ÎÄÌ¿®, ¥¿¡¼¥ß¥Ê¥ë¤½¤Î¾¤Î¥Ç¥Ð¥¤¥¹¤Ç¹¤¯»È¤ï¤ì¤Æ¤¤¤Þ¤¹.
¥·¥ê¥¢¥ëžÁ÷¤Ë¤Ï¼ç¤ËƱ´ü¤ÈÈ󯱴ü¤È¤¤¤¦ Æó¤Ä¤Î·Á¼°¤¬¤¢¤ê¤Þ¤¹: ÄÌ¿®¥µ¥Ö¥·¥¹¥Æ¥à¤Î̾Á°¤Ï, ¤½¤Î¥Ï¡¼¥É¥¦¥§¥¢¤Ç¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë ÄÌ¿®¥â¡¼¥É¤Ë¤è¤Ã¤ÆÊѲ½¤·¤Þ¤¹. Ä̾ï, È󯱴üÄÌ¿®¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¤â¤Î¤Ïʸ»ú A ¤ò´Þ¤ß, Ʊ´üÄÌ¿®¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¤â¤Î¤Ïʸ»ú S ¤ò´Þ¤ß¤Þ¤¹. °Ê²¼¤ÇξÊý¤Î·Á¼°¤Ë¤Ä¤¤¤Æ¾Ü¤·¤¯ÀâÌÀ¤·¤Þ¤¹.
Ä̾ï»È¤ï¤ì¤Æ¤¤¤ëά¹æ¤Ï°Ê²¼¤ÎÄ̤ê¤Ç¤¹:
UART ÈÆÍÑÈ󯱴üÁ÷¼õ¿®ÁõÃÖ (Universal Asynchronous Receiver/Transmitter)
USART ÈÆÍÑÆ±´ü-È󯱴üÁ÷¼õ¿®ÁõÃÖ (Universal Synchronous-Asynchronous Receiver/Transmitter)
Ʊ´ü¥·¥ê¥¢¥ëžÁ÷¤Ç¤Ï, Á÷¿®Â¦¤È¼õ¿®Â¦¤¬¥¯¥í¥Ã¥¯¤ò¶¦Í¤·¤Æ¤¤¤ë ɬÍפ¬¤¢¤ê¤Þ¤¹. ¤µ¤â¤Ê¤±¤ì¤Ð, Á÷¿®Â¦¤¬¥¹¥È¥í¡¼¥Ö¤Þ¤¿¤Ï ¤½¤Î¾¤Î¥¿¥¤¥ß¥ó¥°¿®¹æ¤ò¶¡µë¤·¤Æ, ¼õ¿®Â¦¤Ë¥Ç¡¼¥¿¤Î¼¡¤Î¥Ó¥Ã¥È¤ò ¤¤¤Ä``ÆÉ¤ß¹þ'' ¤á¤Ð¤è¤¤¤Î¤«¤òÃΤ餻¤ëɬÍפ¬¤¢¤ê¤Þ¤¹.
¤Û¤È¤ó¤É¤ÎƱ´ü¥·¥ê¥¢¥ëÄÌ¿®¤Ç¤Ï, ¾ï¤Ë²¿¤é¤«¤Î¥Ç¡¼¥¿¤¬Å¾Á÷¤µ¤ì³¤±¤Þ¤¹. ¤½¤Î¤¿¤á, žÁ÷¤Î¥¿¥¤¥ß¥ó¥°¤Þ¤Ç¤ËÁ÷¿®¥Ç¡¼¥¿¤¬ÍѰդǤ¤Æ¤¤¤Ê¤±¤ì¤Ð, Ä̾ï¤Î¥Ç¡¼¥¿¤Î¤«¤ï¤ê¤Ë¡ÖËä¤áÁð¡× (fill character) ¤¬Á÷¤é¤ì¤Þ¤¹. Ʊ´üÄÌ¿®¤Ç¤Ï, Á÷¿®Â¦¤È¼õ¿®Â¦¤È¤Î´Ö¤Ç¥Ç¡¼¥¿¥Ó¥Ã¥È¤Î¤ß¤¬Å¾Á÷¤µ¤ì¤ë¤¿¤á, Ʊ¤¸¥Ó¥Ã¥È®ÅÙ¤ÎÈ󯱴ü¥·¥ê¥¢¥ëÄÌ¿®¤ËÈæ¤Ù¤Æ¸úΨŪ¤Ç¤¹. ¤·¤«¤·, Á÷¿®Â¦¤È¼õ¿®Â¦¤Ç¥¯¥í¥Ã¥¯¿®¹æ¤ò¶¦Í¤¹¤ë¤¿¤á¤Ë;ʬ¤ÊÅÅÀþ¤È ²óÏ©¤¬É¬ÍפȤʤë¾ì¹ç¤Ë¤Ï, ¤è¤ê¥³¥¹¥È¹â¤È¤Ê¤ë²ÄǽÀ¤¬¤¢¤ê¤Þ¤¹.
¥×¥ê¥ó¥¿¤ä¥Ï¡¼¥É¥Ç¥£¥¹¥¯¤Ç¤âƱ´üžÁ÷¤Î °ì¼ï¤¬»ÈÍѤµ¤ì¤Æ¤¤¤Þ¤¹. ¤³¤Î¤È¤¥Ç¡¼¥¿¤¬ 1 ÁȤߤÎÅÅÀþ¤ÇÁ÷¤é¤ì¤ë°ìÊý, ¥¯¥í¥Ã¥¯¿®¹æ¤Þ¤¿¤Ï ¥¹¥È¥í¡¼¥Ö¿®¹æ¤¬Ê̤ÎÅÅÀþ¤ÇÁ÷¤é¤ì¤Þ¤¹. ¥×¥ê¥ó¥¿¤ä¥Ï¡¼¥É¥Ç¥£¥¹¥¯¤ÏÄ̾ï, ¥·¥ê¥¢¥ë¥Ç¥Ð¥¤¥¹¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó. ¤Û¤È¤ó¤É¤Î¥Ï¡¼¥É¥Ç¥£¥¹¥¯¤Î¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹µ¬³Ê¤Ç¤Ï, ¥Ç¡¼¥¿¤òÁ÷¤ë¤¿¤á¤Î Àþ¤È¤ÏÊ̤˥¯¥í¥Ã¥¯¤Þ¤¿¤Ï¥¹¥È¥í¡¼¥Ö¿®¹æ¤ò Á÷¤ë¤¿¤á¤ÎÀþ¤ò»ý¤Ã¤Æ¤¤¤Æ, ¥¹¥È¥í¡¼¥Ö 1 ²óËè¤Ë°ì¤Ä¤Î¥Ç¡¼¥¿Á´ÂΤòÁ÷¤ê¤Þ¤¹. PC »º¶È³¦¤Ç¤Ï, ¤³¤ì¤é¤Ï¥Ñ¥é¥ì¥ë¥Ç¥Ð¥¤¥¹¤È¤·¤ÆÃΤé¤ì¤Æ¤¤¤Þ¤¹.
PC ¤Îɸ½àŪ¤Ê¥·¥ê¥¢¥ëÄÌ¿®¥Ï¡¼¥É¥¦¥§¥¢¤Ï, Ʊ´ü¥â¡¼¥É¤ò¥µ¥Ý¡¼¥È¤·¤Æ ¤¤¤Þ¤»¤ó. ¤³¤³¤ÇƱ´ü¥â¡¼¥É¤Ë¤Ä¤¤¤Æ½Ò¤Ù¤¿¤Î¤Ï, È󯱴ü¥â¡¼¥É¤È¤Î Èæ³Ó¤Î¤¿¤á¤Ë²á¤®¤Þ¤»¤ó.
È󯱴üžÁ÷¤Ï, Á÷¿®Â¦¤¬¥¯¥í¥Ã¥¯¿®¹æ¤ò¼õ¿®Â¦¤ËÁ÷¤é¤Ê¤¯¤Æ¤â ¥Ç¡¼¥¿¤òžÁ÷¤¹¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹. ¤½¤Î¤«¤ï¤ê, Á÷¿®Â¦¤È¼õ¿®Â¦¤Ï ¤¢¤é¤«¤¸¤á¥¿¥¤¥ß¥ó¥°¥Ñ¥é¥á¡¼¥¿¤äƱ´ü¤Î¤¿¤á¤ËÄɲ䵤ì¤ë ÆÃÊ̤ʥӥåȤˤĤ¤¤Æ ¼è¤ê·è¤á¤ò¤ª¤³¤Ê¤Ã¤Æ¤ª¤«¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó.
È󯱴üžÁ÷¤ò¤ª¤³¤Ê¤¦¤¿¤á¤Ë UART ¤Ë¥Ç¡¼¥¿¤¬Í¿¤¨¤é¤ì¤ë¤È, ¡Ö¥¹¥¿¡¼¥È¥Ó¥Ã¥È¡× ¤È¸Æ¤Ð¤ì¤ë¥Ó¥Ã¥È¤¬Å¾Á÷¥Ç¡¼¥¿¤ÎÀèÆ¬¤ËÄɲ䵤ì¤Þ¤¹. ¥¹¥¿¡¼¥È¥Ó¥Ã¥È¤Ï¥Ç¡¼¥¿¤ÎžÁ÷³«»Ï¤ò¼õ¿®Â¦¤Ë ÃΤ餻¤ë¤¿¤á¤Ë»È¤ï¤ì, ¤³¤ì¤Ë¤è¤ê¼õ¿®Â¦¤Î¥¯¥í¥Ã¥¯¤òÁ÷¿®Â¦¤Î¥¯¥í¥Ã¥¯¤Ë Ʊ´ü¤µ¤»¤Þ¤¹. ¤³¤ÎÆó¤Ä¤Î¥¯¥í¥Ã¥¯¤Ï, žÁ÷¥Ç¡¼¥¿¤Î»Ä¤ê¤Î¥Ó¥Ã¥È¤òžÁ÷¤¹¤ë´Ö¤Ë 10% °Ê¾å¤Õ¤é¤Ä¤«¤Ê¤¤¤è¤¦¤ËÀµ³Î¤Ê¤â¤Î¤Ç¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó. (¤³¤Î¾ò·ï¤Ïµ¡³£¼°¥Æ¥ì¥¿¥¤¥×¤Î»þÂå¤ËÄê¤á¤é¤ì¤¿¤â¤Î¤Ê¤Î¤Ç, ¸½Âå¤ÎÅÅ»ÒÁõÃ֤Ǥ¢¤ì¤ÐÍÆ°×¤ËËþ¤µ¤»¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹).
¥¹¥¿¡¼¥È¥Ó¥Ã¥È¤¬Á÷¤é¤ì¤¿¸å, ¥Ç¡¼¥¿¤Î³Æ¥Ó¥Ã¥È¤¬ºÇ²¼°Ì (LSB) ¤«¤é ½çÈÖ¤ËÁ÷¤é¤ì¤Þ¤¹. žÁ÷¤µ¤ì¤ë¥Ó¥Ã¥È¤ÎŤµ¤Ï¤¹¤Ù¤ÆÆ±¤¸¤Ë¤Ê¤Ã¤Æ¤¤¤Æ, ¼õ¿®Â¦¤Ï¤½¤ì¤¾¤ì¤Î¥Ó¥Ã¥È¤ÎÃæ±ûÉô¤Ç¤½¤ì¤¬ 1 ¤« 0 ¤«¤òȽÃǤ·¤Þ¤¹. Î㤨¤Ð, ²¾¤Ë 1 ¥Ó¥Ã¥È¤òÁ÷¤ë¤Î¤Ë 2 É䫤«¤ë¤È¤¹¤ë¤È, ¼õ¿®Â¦¤Ï ¥¹¥¿¡¼¥È¥Ó¥Ã¥È¤Î»Ï¤Þ¤ê¤òǧ¼±¤·¤¿ 1 Éøå¤Ë¿®¹æ¤¬ 1 ¤« 0 ¤«¤òÄ´¤Ù, ¤½¤Î¸å 2 É䴤Ȥ˼¡¤Î¥Ó¥Ã¥È¤ÎÃͤòÄ´¤Ù¤ë¤È¤¤¤¦Æ°ºî¤ò·«¤êÊÖ¤·¤Þ¤¹.
Á÷¿®Â¦¤Ï, ¤¤¤Ä¼õ¿®Â¦¤¬¥Ó¥Ã¥È¤ÎÃͤò ``¸«¤¿'' ¤Î¤«¤Ï¤ï¤«¤ê¤Þ¤»¤ó. Á÷¿®Â¦¤Ï¥¯¥í¥Ã¥¯¤Ë¤·¤¿¤¬¤Ã¤Æ ¼¡¡¹¤Ë¥Ó¥Ã¥È¤òžÁ÷¤¹¤ë¤À¤±¤Ç¤¹.
ÀßÄê¤Ë¤è¤Ã¤Æ¤Ï, 1 ¥ï¡¼¥É¤Î¥Ç¡¼¥¿Á´ÂΤ¬Á÷¤é¤ì¤¿¤¢¤È¤Ë Á÷¿®Â¦¤¬ÆâÉô¤ÇÀ¸À®¤·¤¿¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤ò Éղ乤ë¾ì¹ç¤¬¤¢¤ê¤Þ¤¹. ¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤Ï¼õ¿®Â¦¤Ç´Êñ¤Ê¥¨¥é¡¼¥Á¥§¥Ã¥¯¤ò ¤¹¤ë¤¿¤á¤Ë»È¤ï¤ì¤Þ¤¹. ¤½¤Î¸å¤Ë, ºÇÄã¤Ç¤â 1 ¥Ó¥Ã¥È¤Î¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤¬Á÷¤é¤ì¤Þ¤¹.
1 ¥ï¡¼¥É¤Î¤¹¤Ù¤Æ¤Î¥Ó¥Ã¥È¤ò¼õ¿®¤¹¤ë¤È, ¼õ¿®Â¦¤¬¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤Î ¥Á¥§¥Ã¥¯¤ò¤ª¤³¤Ê¤¦¤è¤¦¤ËÀßÄꤹ¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹. (¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤ò »ÈÍѤ¹¤ë¤«¤É¤¦¤«, Á÷¿®Â¦¤È¼õ¿®Â¦¤Ç¤¢¤é¤«¤¸¤á¼è¤ê·è¤á¤Æ¤ª¤«¤Ê¤±¤ì¤Ð ¤Ê¤ê¤Þ¤»¤ó). ¤½¤ì¤«¤é¼õ¿®Â¦¤Ï¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤ò¥Á¥§¥Ã¥¯¤·¤Þ¤¹. ¤â¤·¤â¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤¬´üÂÔÄ̤ê¤Î°ÌÃ֤˸ºß¤·¤Ê¤±¤ì¤Ð, UART ¤Ï žÁ÷¥¨¥é¡¼¤¬È¯À¸¤·¤¿¤ÈȽÃǤ·¤Æ, ¥Û¥¹¥È¤¬¥Ç¡¼¥¿¤òÆÉ¤â¤¦¤È¤·¤¿»þ¤Ë ¥Õ¥ì¡¼¥ß¥ó¥°¥¨¥é¡¼¤¬µ¯¤¤¿¤ÈÊó¹ð¤·¤Þ¤¹. Ä̾ï, ¥Õ¥ì¡¼¥ß¥ó¥°¥¨¥é¡¼¤Ï Á÷¿®Â¦¤È¼õ¿®Â¦¤Î¥¯¥í¥Ã¥¯¤¬°ìÃפ·¤Æ¤¤¤Ê¤«¤Ã¤¿¤ê, ¿®¹æ¤Ë³ä¤ê¹þ¤ß¤¬ Æþ¤Ã¤¿»þ¤Ëµ¯¤³¤ê¤Þ¤¹.
¥Ç¡¼¥¿¤¬Àµ¤·¤¯¼õ¿®¤µ¤ì¤¿¤«¤É¤¦¤«¤Ë¤«¤«¤ï¤é¤º, UART ¤Ï¥¹¥¿¡¼¥È, ¥Ñ¥ê¥Æ¥£, ¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤ò¼«Æ°Åª¤Ë¼Î¤Æ¤Þ¤¹. Á÷¿®Â¦¤È¼õ¿®Â¦¤ÇÀßÄ꤬Àµ¤·¤¯°ìÃפ·¤Æ¤¤¤ì¤Ð, ¤³¤ì¤é¤Î¥Ó¥Ã¥È¤¬ ¸í¤Ã¤Æ¥Û¥¹¥È¤ËžÁ÷¤µ¤ì¤ë¤³¤È¤Ï¤¢¤ê¤Þ¤»¤ó.
1 ²ó¤ÎžÁ÷¤¬½ªÎ»¤¹¤ëÁ°¤Ë¼¡¤Î¥Ç¡¼¥¿¤ÎžÁ÷½àÈ÷¤¬¤Ç¤¤Æ¤¤¤ì¤Ð, Á°¤Î¥Ç¡¼¥¿¤Î¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤òÁ÷¤Ã¤¿¸å, ´Ö¤ò¶õ¤±¤º¤Ë ¼¡¤Î¥Ç¡¼¥¿¤Î¥¹¥¿¡¼¥È¥Ó¥Ã¥È¤òÁ÷¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹.
È󯱴üžÁ÷¥Ç¡¼¥¿¤Ï``¼«¸ÊƱ´ü''¤Ê¤Î¤Ç, žÁ÷¤¹¤ë¤Ù¤¥Ç¡¼¥¿¤¬¤Ê¤¤¾ì¹ç¤Ï žÁ÷Ï©¤Ï¶õ¤¾õÂ֤ˤʤê¤Þ¤¹.
žÁ÷¤Î¤¿¤á¤Ë¥Ç¡¼¥¿¤ò¥Ñ¥é¥ì¥ë¤«¤é¥·¥ê¥¢¥ë¤ËÊÑ´¹¤·, ¼õ¿®»þ¤Ë ¥·¥ê¥¢¥ë¤«¤é¥Ñ¥é¥ì¥ë¤ËÌ᤹¤È¤¤¤¦´ðËÜŪ¤Êµ¡Ç½¤Î¾¤Ë, UART ¤ÏÄ̾ï, žÁ÷Ï©¤Î¾õÂÖ¤ò¼¨¤·¤¿¤ê, ¥ê¥â¡¼¥È¥Ç¥Ð¥¤¥¹¤Ç¼¡¤Î¥Ç¡¼¥¿¤ò¼õ¤±¤È¤ë½àÈ÷¤¬ ¤Ç¤¤Æ¤¤¤Ê¤¤¾ì¹ç¤Ë¥Ç¡¼¥¿¤Îή¤ì¤òÍÞÀ©¤¹¤ë¤Î¤Ë »È¤ï¤ì¤ë¿®¹æ¤Î¤¿¤á¤Î ÉղòóÏ©¤â»ý¤Ã¤Æ¤¤¤Þ¤¹. Î㤨¤Ð UART ¤ËÀܳ¤µ¤ì¤Æ¤¤¤ë¥Ç¥Ð¥¤¥¹¤¬¥â¥Ç¥à¤Î¾ì¹ç, ¥â¥Ç¥à¤Ï ²óÀþ¾å¤ËÈÂÁ÷ÇÈ (carrier) ¤¬Â¸ºß¤·¤Æ¤¤¤ë¤³¤È¤òÊó¹ð¤¹¤ë¤«¤â¤·¤ì¤Þ¤»¤ó. °ìÊý, ¥³¥ó¥Ô¥å¡¼¥¿¤Ï¤³¤ì¤é¤ÎÉղÿ®¹æ¤òÁàºî¤¹¤ë¤³¤È¤Ë¤è¤ê ¥â¥Ç¥à¤Î¥ê¥»¥Ã¥È¤ò¤ª¤³¤Ê¤Ã¤¿¤ê, ¤«¤«¤Ã¤Æ¤¤¿ÅÅÏäò¼è¤é¤Ê¤¤¤è¤¦¤Ë ¥â¥Ç¥à¤Ë»Ø¼¨¤¹¤ë¤«¤â¤·¤ì¤Þ¤»¤ó. ¤³¤ì¤é¤ÎÉղÿ®¹æ¤Îµ¡Ç½¤Ï¤½¤ì¤¾¤ì EIA RE232-C µ¬³Ê¤ÇÄêµÁ¤µ¤ì¤Æ¤¤¤Þ¤¹.
¤Û¤È¤ó¤É¤Î¥³¥ó¥Ô¥å¡¼¥¿¥·¥¹¥Æ¥à¤Ç¤Ï, UART ¤Ï EIA RS-232C µ¬³Ê¤Ë ½àµò¤·¤¿¿®¹æ¤òÀ¸À®¤¹¤ë¤¿¤á¤Î²óÏ©¤ËÀܳ¤µ¤ì¤Æ¤¤¤Þ¤¹. ¤Þ¤¿, RS-232C ¤Î»ÅÍͤòÈ¿±Ç¤·¤¿, V.24 ¤È¤¤¤¦ CCITT µ¬³Ê¤Ë ½àµò¤·¤¿¥·¥¹¥Æ¥à¤â¸ºß¤·¤Æ¤¤¤Þ¤¹.
RS-232C ¤Ç¤Ï, 1 ¤ÎÃͤò¥Þ¡¼¥¯, 0 ¤ÎÃͤò¥¹¥Ú¡¼¥¹¤È ¸Æ¤Ó¤Þ¤¹. ÄÌ¿®Ï©¤Ë¥Ç¡¼¥¿¤¬Î®¤ì¤Æ¤¤¤Ê¤¤»þ, ²óÀþ¤Ï``¥Þ¡¼¥¥ó¥°'' ¤Ç¤¢¤ë¤È¤«, 1 ¤ÎÃͤòϢ³¤·¤ÆÅ¾Á÷¤·Â³¤±¤Æ¤¤¤ë¤È¤«¸À¤ï¤ì¤Þ¤¹.
¥¹¥¿¡¼¥È¥Ó¥Ã¥È¤Ï¾ï¤Ë 0 (¥¹¥Ú¡¼¥¹) ¤Ç, ¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤Ï¾ï¤Ë 1 (¥Þ¡¼¥¯) ¤Ç¤¹. ¤³¤Î¤³¤È¤Ï, ¤¿¤È¤¨Ê£¿ô¤Î¥Ç¡¼¥¿¤¬Ï¢Â³¤·¤ÆÅ¾Á÷¤µ¤ì¤Æ¤¤¤ë¾ì¹ç¤Ç¤â, ¤½¤ì¤¾¤ì¤Î¥Ç¡¼¥¿¤ÎžÁ÷³«»Ï»þ¤Ë¤Ïɬ¤º, ¥Þ¡¼¥¯ (1) ¤«¤é ¥¹¥Ú¡¼¥¹ (0) ¤Ø¤ÎÁ«°Ü¤¬²óÀþ¾å¤Çµ¯¤³¤ë¤È¤¤¤¦¤³¤È¤ò°ÕÌ£¤·¤Æ¤¤¤Þ¤¹.
¤³¤ì¤Ë¤è¤Ã¤Æ, žÁ÷¤µ¤ì¤ë¥Ç¡¼¥¿¥Ó¥Ã¥È¤ÎÆâÍÆ¤Ë¤«¤«¤ï¤é¤º, Á÷¿®Â¦¤È¼õ¿®Â¦¤Î ¥¯¥í¥Ã¥¯¤òƱ´ü¤µ¤»¤ë¤³¤È¤¬¤Ç¤¤ë¤Î¤Ç¤¹.
¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤È¥¹¥¿¡¼¥È¥Ó¥Ã¥È¤Î´Ö¤Î¶õ¤»þ´Ö¤Ï, ¤½¤ÎÄÌ¿®Ï©¤Ç 1 ¥Ó¥Ã¥È¤òžÁ÷¤¹¤ë¤Î¤ËɬÍפʻþ´Ö¤ÎÀµ³Î¤ÊÇÜ¿ô¤Ç¤¢¤ë ɬÍפϤ¢¤ê¤Þ¤»¤ó. (ÇÜ¿ô¤Ë¤Ï¥¼¥í¤ò´Þ¤ß¤Þ¤¹). ¤·¤«¤·, ¤Û¤È¤ó¤É¤Î UART ¤Ç¤Ï À߷פÎñ½ã²½¤Î¤¿¤á¤Ë, ÇÜ¿ô¤Ë¤Ê¤ë¤è¤¦¤ËÀ߷פµ¤ì¤Æ¤¤¤Þ¤¹.
RS-232C ¤Ç¤Ï, ¡Ö¥Þ¡¼¥¯¡×¿®¹æ (1) ¤Ï -2V ¤«¤é -12V ¤Î´Ö¤ÎÅ۵¤Ç, ¡Ö¥¹¥Ú¡¼¥¹¡×¿®¹æ (0) ¤Ï 0V ¤«¤é +12V ¤Î´Ö¤ÎÅ۵¤Ç¼¨¤µ¤ì¤Þ¤¹. Á÷¿®Éô¤Ï +12V ¤Þ¤¿¤Ï -12V ¤òÁ÷¤ë¤³¤È¤Ë¤Ê¤Ã¤Æ¤¤¤Æ, ¼õ¿®Éô¤Ç¤Ï Ť¤¥±¡¼¥Ö¥ë¤Ë¤è¤ë¤¤¤¯¤é¤«¤ÎÅ۵¥í¥¹¤ò µöÍÆ¤¹¤ë¤è¤¦¤ËÄê¤á¤é¤ì¤Æ¤¤¤Þ¤¹. (¥Ý¡¼¥¿¥Ö¥ë¥³¥ó¥Ô¥å¡¼¥¿¤Ê¤É¤Ç»ÈÍѤµ¤ì¤Æ¤¤¤ë) Äã¾ÃÈñÅÅÎϥǥХ¤¥¹¤Î Á÷¿®Éô¤Ç¤Ï ¤·¤Ð¤·¤Ð +5V ¤È -5V ¤Î¤ß¤ò»ÈÍѤ·¤Æ¤¤¤Þ¤¹¤¬, û¤¤¥±¡¼¥Ö¥ë¤ò»ÈÍѤ¹¤ë¤Ê¤é¤Ð, ¤³¤ì¤é¤ÎÅ۵¤â RS-232C ¼õ¿®Éô¤Î µöÍÆÈÏ°Ï¤ËÆþ¤Ã¤Æ¤¤¤Þ¤¹.
RS-232C ¤Ï ¥Ö¥ì¡¼¥¯ ¤È¸Æ¤Ð¤ì¤ë¿®¹æ¤Ë¤Ä¤¤¤Æ¤âÄê¤á¤Æ¤¤¤Þ¤¹. ¤³¤ì¤Ï (¥¹¥¿¡¼¥È¥Ó¥Ã¥È¤â¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤â̵¤·¤Ç) Ϣ³¤·¤Æ ¥¹¥Ú¡¼¥¹¤ÎÃͤòÁ÷¤ë¤³¤È¤ÇȯÀ¸¤µ¤ì¤Þ¤¹. ¥Ç¡¼¥¿²óÏ©¤ËÅÅή¤¬Î®¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç¤Ï, ²óÀþ¤Ï ¥Ö¥ì¡¼¥¯ ¤òÁ÷¤ê³¤±¤Æ¤¤¤ë¤â¤Î¤È²ò¼á¤µ¤ì¤Þ¤¹.
¥Ö¥ì¡¼¥¯ ¿®¹æ¤Ï´°Á´¤Ê 1 ¥Ð¥¤¥È¤È¥¹¥¿¡¼¥È, ¥¹¥È¥Ã¥×, ¥Ñ¥ê¥Æ¥£ ¥Ó¥Ã¥È¤òÁ÷¤ë¤¿¤á¤ËɬÍפʻþ´Ö¤è¤ê¤â Ť¤´Ö³¤«¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó. ¤Û¤È¤ó¤É¤Î UART ¤Ï¥Õ¥ì¡¼¥ß¥ó¥°¥¨¥é¡¼¤È¥Ö¥ì¡¼¥¯¤ò¶èÊ̤¹¤ë¤³¤È¤¬ ¤Ç¤¤Þ¤¹¤¬, ¤â¤·¤â ¤³¤ì¤ò¶èÊ̤Ǥ¤Ê¤¤ UART ¤¬¤¢¤Ã¤¿¾ì¹ç, ¥Õ¥ì¡¼¥ß¥ó¥°¥¨¥é¡¼¤Î¸¡½Ð¤ò¥Ö¥ì¡¼¥¯¤Î¼±Ê̤Τ¿¤á¤Ë »ÈÍѤ¹¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹.
¥Æ¥ì¥¿¥¤¥×¤Î»þÂå¤Ë¤Ï, ¹ñÃæ¤Ç¤ª¤Ó¤¿¤À¤·¤¤¿ô¤Î¥Æ¥ì¥¿¥¤¥×¤¬ (¥Ë¥å¡¼¥¹¥µ¡¼¥Ó¥¹¤Ê¤É¤Ç) ÅÅÀþ¤ÇľÎó¤ËÀܳ¤µ¤ì¤Æ¤¤¤Þ¤·¤¿. Ǥ°Õ¤Î¥Æ¥ì¥¿¥¤¥×¥æ¥Ë¥Ã¥È¤Ï, ÅÅή¤¬Î®¤ì¤Ê¤¤¤è¤¦¤Ë°ì»þŪ¤Ë²óÏ©¤ò ¥ª¡¼¥×¥ó¤Ë¤¹¤ë¤³¤È¤Ç ¥Ö¥ì¡¼¥¯ ¿®¹æ¤òȯÀ¸¤µ¤»¤ë¤³¤È¤¬¤Ç¤¤Þ¤·¤¿. ¤³¤ì¤Ï, ¾¤Î¥Æ¥ì¥¿¥¤¥×¤¬¾ðÊó¤òÁ÷¿®¤·¤Æ¤¤¤ë´Ö¤Ë, ¶ÛµÞ¥Ë¥å¡¼¥¹¤ò Á÷¤ëɬÍפΤ¢¤ë¥Æ¥ì¥¿¥¤¥×¤¬ ³ä¤ê¹þ¤ß¤ò¤«¤±¤ë¤¿¤á¤Ë»È¤ï¤ì¤Þ¤·¤¿.
¸½ºß¤Î¥·¥¹¥Æ¥à¤Ç¤Ï, ¥Ö¥ì¡¼¥¯¿®¹æ¤Ë¤ÏÆó¤Ä¤Î¥¿¥¤¥×¤¬¤¢¤ê¤Þ¤¹. ¤â¤·¥Ö¥ì¡¼¥¯¿®¹æ¤¬ 1.6 Éäè¤ê¤âŤ±¤ì¤Ð, ¤½¤ì¤Ï ¡Ö¥â¥Ç¥à¥Ö¥ì¡¼¥¯¡×¤Ç¤¢¤ë¤È²ò¼á¤µ¤ì¤Þ¤¹. ¥â¥Ç¥à¤¬¤³¤Î¿®¹æ¤ò¸¡½Ð¤¹¤ë¤È, ÄÌ¿®¤ò½ªÎ»¤·¤ÆÅÅÏäòÀڤ俤ê, ¥³¥Þ¥ó¥É¥â¡¼¥É¤ËÆþ¤ë¤è¤¦¤Ë ¥×¥í¥°¥é¥à¤µ¤ì¤Æ¤¤¤ë¤³¤È¤¬¤¢¤ê¤Þ¤¹. ¤â¤·¥Ö¥ì¡¼¥¯¿®¹æ¤¬ 1.6 Éäè¤ê¤âû¤±¤ì¤Ð, ¤½¤ì¤Ï¥Ç¡¼¥¿¥Ö¥ì¡¼¥¯¤ò ¼¨¤·¤Þ¤¹. ¤³¤Î¿®¹æ¤Ë±þÅú¤¹¤ë¤Î¤Ï¥ê¥â¡¼¥È¥³¥ó¥Ô¥å¡¼¥¿¤Î»Å»ö¤Ç¤¹. ¤³¤Î·Á¤Î¥Ö¥ì¡¼¥¯¤Ï, ¤·¤Ð¤·¤ÐÃí°Õ´µ¯¤Þ¤¿¤Ï³ä¤ê¹þ¤ß¤Î¤¿¤á¤Î¿®¹æ¤È¤·¤Æ »È¤ï¤ì, ASCII ¤Î CONTROL-C ʸ»ú¤ÎÂåÍѤȤµ¤ì¤ë¤³¤È¤â¤¢¤ê¤Þ¤¹.
¥Þ¡¼¥¯¤È¥¹¥Ú¡¼¥¹¤Ï»æ¥Æ¡¼¥×¥·¥¹¥Æ¥à¤Ç¤Î ``·ê¶õ¤'' ¤È ``·ê̵¤·'' ¤Ë ÁêÅö¤·¤Æ¤¤¤Þ¤¹.
Note: ¥Ö¥ì¡¼¥¯¿®¹æ¤Ï, »æ¥Æ¡¼¥×¤Þ¤¿¤Ï¤½¤Î¾¤Î¥Ð¥¤¥ÈÎ󤫤éÀ¸À®¤Ç¤¤Ê¤¤ ¤³¤È¤ËÃí°Õ¤·¤Æ¤¯¤À¤µ¤¤. ¤Ê¤¼¤Ê¤é¥Ð¥¤¥ÈÎó¤Ï¾ï¤Ë¥¹¥¿¡¼¥È¥Ó¥Ã¥È¤ä ¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤È¤È¤â¤ËÁ÷¤é¤ì¤ë¤«¤é¤Ç¤¹. UART ¤Ë¤ÏÄ̾ï, ¥Û¥¹¥È¥×¥í¥»¥Ã¥µ¤«¤é¤ÎÆÃÊ̤ʥ³¥Þ¥ó¥É¤Ë¤è¤ê Ϣ³¤·¤¿¥¹¥Ú¡¼¥¹¿®¹æ¤òÀ¸À®¤¹¤ëǽÎϤ¬¤¢¤ê¤Þ¤¹.
RS-232C µ¬³Ê¤ÏÆó¤Ä¤Î¥¿¥¤¥×¤ÎÁõÃÖ¤òÄê¤á¤Æ¤¤¤Þ¤¹: ¤½¤ì¤Ï¥Ç¡¼¥¿¥¿¡¼¥ß¥Ê¥ëÁõÃÖ (DTE) ¤È¥Ç¡¼¥¿¥¥ã¥ê¥¢ÁõÃÖ (DCE) ¤Ç¤¹. Ä̾ï, DTE ¥Ç¥Ð¥¤¥¹¤Ï¥¿¡¼¥ß¥Ê¥ë (¤Þ¤¿¤Ï¥³¥ó¥Ô¥å¡¼¥¿) ¤Ç, DCE ¤Ï ¥â¥Ç¥à¤Ç¤¹. ÅÅÏòóÀþ¤ò²ð¤·¤¿ÄÌ¿®¤Î¤â¤¦°ìÊý¤Îü¤Ç¤¢¤ë¼õ¿®Â¦¤Î¥â¥Ç¥à¤â ¤Þ¤¿ DCE ¥Ç¥Ð¥¤¥¹¤Ç, ¤½¤Î¥â¥Ç¥à¤ËÀܳ¤µ¤ì¤Æ¤¤¤ë¥³¥ó¥Ô¥å¡¼¥¿¤Ï DTE ¥Ç¥Ð¥¤¥¹¤Ç¤¹. DCE ¥Ç¥Ð¥¤¥¹¤¬¿®¹æ¤ò¼õ¤±¼è¤ë¥Ô¥ó¤Ï DTE ¥Ç¥Ð¥¤¥¹¤¬ ¿®¹æ¤òÁ÷¤ë¥Ô¥ó¤Ç¤¢¤ê, ¤Þ¤¿µÕ¤âƱÍͤǤ¹.
Æó¤Ä¤Î¥Ç¥Ð¥¤¥¹¤¬¤È¤â¤Ë DTE ¤Ç¤¢¤Ã¤¿¤ê, ¤È¤â¤Ë DCE ¤Ç¤¢¤Ã¤Æ, ¥â¥Ç¥à¤ä¤½¤ì¤ËÎà»÷¤·¤¿¥á¥Ç¥£¥¢ÊÑ´¹ÁõÃÖ¤ò²ð¤µ¤º¤Ë Àܳ¤¹¤ëɬÍפ¬ ¤¢¤ë¾ì¹ç, ¥Ì¥ë¥â¥Ç¥à (NULL modem) ¤ò»È¤ï¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó. ¥Ì¥ë¥â¥Ç¥à¤Ï¥±¡¼¥Ö¥ë¤òÅŵ¤Åª¤ËºÆÇÛÎó¤·, °ìÊý¤Î¥Ç¥Ð¥¤¥¹¤ÎÁ÷¿®½ÐÎϤ¬ ¤â¤¦°ìÊý¤Î¥Ç¥Ð¥¤¥¹¤Î¼õ¿®ÆþÎϤËÀܳ¤µ¤ì, ¤½¤ÎµÕ¤â¤Þ¤¿Æ±ÍÍ¤Ë Àܳ¤µ¤ì¤ë¤è¤¦¤Ë¤·¤Æ¤¯¤ì¤Þ¤¹. ƱÍͤÎÊÑ´¹¤Ï¤¹¤Ù¤Æ¤ÎÀ©¸æ¿®¹æ¤Ë¤Ä¤¤¤Æ¤ª¤³¤Ê¤ï¤ì, ¤½¤ì¤¾¤ì¤Î¥Ç¥Ð¥¤¥¹¤¬ ¾Êý¤Î¥Ç¥Ð¥¤¥¹¤«¤é¤Î DCE (¤Þ¤¿¤Ï DTE) ¿®¹æ¤ò¼õ¤±¤È¤ì¤ë¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹.
DTE ¥Ç¥Ð¥¤¥¹¤È DCE ¥Ç¥Ð¥¤¥¹¤ÇÀ¸À®¤µ¤ì¤ë¿®¹æ¤Î¿ô¤ÏÅù¤·¤¯¤¢¤ê¤Þ¤»¤ó. DTE ¥Ç¥Ð¥¤¥¹¤¬ DCE ¥Ç¥Ð¥¤¥¹¤Î¤¿¤á¤ËÀ¸À®¤¹¤ë¿®¹æ¤Î¿ô¤Ï, DTE ¥Ç¥Ð¥¤¥¹¤¬ DCE ¥Ç¥Ð¥¤¥¹¤«¤é¼õ¤±¤È¤ë¿®¹æ¤Î¿ô¤è¤ê¤â ¾¯¤Ê¤¯¤Ê¤Ã¤Æ¤¤¤Þ¤¹.
EIA ¤Î RS-232C µ¬³Ê (¤ª¤è¤Ó¤³¤ì¤ËÁêÅö¤¹¤ë ITU ¤Î V.24 µ¬³Ê) ¤Ï 25 ¥Ô¥ó¤Î¥³¥Í¥¯¥¿ (Ä̾ï DB25 ¤¬»È¤ï¤ì¤Þ¤¹) ¤òÍ׵ᤷ, ¤½¤Î¥³¥Í¥¯¥¿¤Î¤Û¤È¤ó¤É¤Î¥Ô¥ó¤Î »ÈÍÑÌÜŪ¤òÄêµÁ¤·¤Æ¤¤¤Þ¤¹.
IBM PC ¤ª¤è¤ÓÎà»÷¤Î¥·¥¹¥Æ¥à¤Ç¤Ï, RS-232C ¿®¹æ¤Î¥µ¥Ö¥»¥Ã¥È¤¬ 9 ¥Ô¥ó¤Î¥³¥Í¥¯¥¿ (DB9) ¤ÇÄ󶡤µ¤ì¤Æ¤¤¤Þ¤¹. ¼ç¤ËƱ´ü¥â¡¼¥É¤Ç»ÈÍѤµ¤ì¤ë¿®¹æ¤Ï PC ¤Î¥³¥Í¥¯¥¿¤Ë¤Ï´Þ¤Þ¤ì¤Æ¤¤¤Þ¤»¤ó¤¬, ¤â¤È¤â¤È ¤³¤ÎžÁ÷¥â¡¼¥É¤Ï IBM ¤¬ IBM PC ¤Ç»ÈÍѤ¹¤ë¤³¤È¤Ë¤·¤¿ UART ¤Ç¤Ï¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤Þ¤»¤ó.
¥á¡¼¥«¡¼¤Ë¤è¤Ã¤Æ¤Ï RS-232C ÍѤΥ³¥Í¥¯¥¿¤Ë DB25 ¤« DB9, ¤Þ¤¿¤Ï¤½¤Îξ¥¿¥¤¥×¤Î¥³¥Í¥¯¥¿¤ò»È¤Ã¤Æ¤¤¤ë¾ì¹ç¤¬¤¢¤ê¤Þ¤¹. (IBM PC ¤Ï¥Ñ¥é¥ì¥ë¥×¥ê¥ó¥¿¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤Ë¤â DB25 ¥³¥Í¥¯¥¿¤ò »È¤Ã¤Æ¤¤¤ë¤Î¤Ç, ¤³¤Î¤³¤È¤Ï ¤·¤Ð¤·¤Ðº®Íð¤ò°ú¤µ¯¤³¤·¤Þ¤¹.)
°Ê²¼¤Ï DB25 ¤ª¤è¤Ó DB9 ¥³¥Í¥¯¥¿¤Ë¤ª¤±¤ë RS-232C ¿®¹æ¤Î³ä¤êÅö¤ÆÉ½¤Ç¤¹.
DB25 RS232-C ü»Ò | DB9 IBM PC ü»Ò | EIA ²óÏ©É乿 | CCITT ²óÏ©É乿 | °ìÈÌ̾¾Î | ¿®¹æ¸» | ÀâÌÀ |
---|---|---|---|---|---|---|
1 | - | AA | 101 | PG/FG | - | ÊݰÂÍÑÀÜÃÏ |
2 | 3 | BA | 103 | TD | DTE | Á÷¿®¥Ç¡¼¥¿ |
3 | 2 | BB | 104 | RD | DCE | ¼õ¿®¥Ç¡¼¥¿ |
4 | 7 | CA | 105 | RTS | DTE | Á÷¿®Í×µá |
5 | 8 | CB | 106 | CTS | DCE | Á÷¿®²Ä |
6 | 6 | CC | 107 | DSR | DCE | ¥Ç¡¼¥¿¥»¥Ã¥È¥ì¥Ç¥£ |
7 | 5 | AV | 102 | SG/GND | - | ¿®¹æÍÑÀÜÃÏ |
8 | 1 | CF | 109 | DCD/CD | DCE | ¼õ¿®¥¥ã¥ê¥¢¸¡½Ð |
9 | - | - | - | - | - | ͽÌó (¥Æ¥¹¥ÈÍÑ) |
10 | - | - | - | - | - | ͽÌó (¥Æ¥¹¥ÈÍÑ) |
11 | - | - | - | - | - | ̤³äÅö¤Æ |
12 | - | CI | 122 | SRLSD | DCE | ½¾¶É¼õ¿®¥¥ã¥ê¥¢¸¡½Ð |
13 | - | SCB | 121 | SCTS | DCE | ½¾¶ÉÁ÷¿®²Ä |
14 | - | SBA | 118 | STD | DTE | ½¾¶ÉÁ÷¿®¥Ç¡¼¥¿ |
15 | - | DB | 114 | TSET | DCE | Á÷¿®¿®¹æ¥¨¥ì¥á¥ó¥È¥¿¥¤¥ß¥ó¥° |
16 | - | SBB | 119 | SRD | DCE | ½¾¶É¼õ¿®¥Ç¡¼¥¿ |
17 | - | DD | 115 | RSET | DCE | ¼õ¿®¿®¹æ¥¨¥ì¥á¥ó¥È¥¿¥¤¥ß¥ó¥° |
18 | - | - | 141 | LOOP | DTE | ¥í¡¼¥«¥ë¥ë¡¼¥×¥Ð¥Ã¥¯ |
19 | - | SCA | 120 | SRS | DTE | ½¾¶ÉÁ÷¿®Í×µá |
20 | 4 | CD | 108.2 | DTR | DTE | ¥Ç¡¼¥¿Ã¼Ëö¥ì¥Ç¥£ |
21 | - | - | - | RDL | DTE | ¥ê¥â¡¼¥È¥Ç¥¸¥¿¥ë¥ë¡¼¥×¥Ð¥Ã¥¯ |
22 | 9 | CE | 125 | RI | DCE | Èï¸ÆÉ½¼¨ |
23 | - | CH | 111 | DSRS | DTE | ¥Ç¡¼¥¿¿®¹æÂ®ÅÙÁªÂò |
24 | - | DA | 113 | TSET | DTE | Á÷¿®¿®¹æ¥¨¥ì¥á¥ó¥È¥¿¥¤¥ß¥ó¥° |
25 | - | - | 142 | - | DCE | ¥Æ¥¹¥È¥â¡¼¥É |
¥Ü¡¼¤È¤ÏÈ󯱴üÄÌ¿®¤Ë¤ª¤±¤ëžÁ÷®ÅÙ¤Îñ°Ì¤Ç¤¹. ¥â¥Ç¥àÄÌ¿®µ»½Ñ¤Î¿ÊÊâ¤Ë¤è¤ê, ¿·¤·¤¤¥Ç¥Ð¥¤¥¹¤Î¥Ç¡¼¥¿Â®ÅÙ¤ò ɽµ¤¹¤ë¤Ë¤¢¤¿¤Ã¤Æ, ¤³¤ÎÍѸ줬 ¤·¤Ð¤·¤Ð¸í¤Ã¤Æ»È¤ï¤ì¤ë¤è¤¦¤Ë¤Ê¤ê¤Þ¤·¤¿.
¥Ü¡¼¥ì¡¼¥È¤ÏÅÁÅýŪ¤Ë, ÄÌ¿®Ï©¤òÄ̤·¤Æ¼ÂºÝ¤ËÁ÷¤é¤ì¤ë¥Ó¥Ã¥È¤Î¿ô¤ò ɽ¤·¤Þ¤¹. ¤¢¤ë DTE ¥Ç¥Ð¥¤¥¹¤«¤é¤â¤¦°ìÊý¤Ø¤È¼ÂºÝ¤Ë°Üư¤·¤¿ ¥Ç¡¼¥¿¤ÎÎ̤òɽ¤¹¤â¤Î¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó. ¥Ü¡¼¥ì¡¼¥È¤Ï, Á÷¿®Â¦ UART ¤ÇÀ¸À®¤µ¤ì¤Æ¼õ¿®Â¦ UART ¤Ç¼è¤ê½ü¤«¤ì¤ë ¥¹¥¿¡¼¥È, ¥¹¥È¥Ã¥×, ¥Ñ¥ê¥Æ¥£¤È¤¤¤Ã¤¿¥ª¡¼¥Ð¡¼¥Ø¥Ã¥É¥Ó¥Ã¥È¤ò¤â ´Þ¤ó¤Ç¤¤¤Þ¤¹. ¤³¤ì¤Ï 1 ¥ï¡¼¥É 7 ¥Ó¥Ã¥È¤Î¥Ç¡¼¥¿¤òÁ÷¤ë¤¿¤á¤Ë¤Ï, ¼ÂºÝ¤Ë¤Ï 10 ¥Ó¥Ã¥È¤Î ¥Ç¡¼¥¿¤¬´°Á´¤ËžÁ÷¤µ¤ì¤ëɬÍפ¬¤¢¤ë¤È¤¤¤¦¤³¤È¤ò°ÕÌ£¤·¤Þ¤¹. ¤½¤Î¤¿¤á, ¤â¤·¥Ñ¥ê¥Æ¥£¤ò»È¤¤, ¥¹¥¿¡¼¥È¥Ó¥Ã¥È¤È¥¹¥È¥Ã¥×¥Ó¥Ã¥È¤¬ ¤½¤ì¤¾¤ì 1 ¥Ó¥Ã¥È¤º¤Ä¸ºß¤¹¤ë¾ì¹ç¤Ë¤Ï, 1 É䢤¿¤ê 300 ¥Ó¥Ã¥È¤Î žÁ÷ǽÎϤò»ý¤Ä¥â¥Ç¥à¤Ç¤Ï, 7 ¥Ó¥Ã¥È¤Î¥ï¡¼¥É¤òÄ̾ï 30 ¸Ä¤·¤« žÁ÷¤¹¤ë¤³¤È¤¬¤Ç¤¤Þ¤»¤ó.
¤â¤· 1 ¥ï¡¼¥É 8 ¥Ó¥Ã¥È¤Î¥Ç¡¼¥¿¤È¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤ò»ÈÍѤ¹¤ë¾ì¹ç¤Ë¤Ï, ¥Ç¡¼¥¿Å¾Á÷®ÅÙ¤Ï 1 É䢤¿¤ê 27.27 ¥ï¡¼¥É¤Þ¤ÇÄã²¼¤·¤Þ¤¹. ¤Ê¤¼¤Ê¤é 8 ¥Ó¥Ã¥È¤Î¥ï¡¼¥É¤òÁ÷¤ë¤Î¤Ë 11 ¥Ó¥Ã¥È¤¬É¬ÍפÇ, ¤³¤Î¥â¥Ç¥à¤Ï 1 ÉÃ´Ö¤Ë 300 ¥Ó¥Ã¥È¤·¤«Á÷¤ë¤³¤È¤¬¤Ç¤¤Ê¤¤¤«¤é¤Ç¤¹.
1 É䢤¿¤ê¤ÎžÁ÷¥Ð¥¤¥È¿ô¤ò¥Ü¡¼¥ì¡¼¥È¤ËÊÑ´¹¤·¤¿¤ê, ¤½¤ÎµÕ¤ò¤ª¤³¤Ê¤¦ ·×»»¼°¤Ï, ¥¨¥é¡¼ÄûÀµ¤ò¤ª¤³¤Ê¤¦¥â¥Ç¥à¤¬¸½¤ì¤ë¤Þ¤Ç¤Ïñ½ã¤Ç¤·¤¿. ¥¨¥é¡¼ÄûÀµ¤ò¤ª¤³¤Ê¤¦¥â¥Ç¥à¤Ï, ¥Û¥¹¥È¥³¥ó¥Ô¥å¡¼¥¿¤Î UART ¤«¤é ¥·¥ê¥¢¥ë¤Î¥Ó¥Ã¥ÈÎó¤ò¼õ¤±¤È¤ê, ¤½¤ì¤ò¥Ð¥¤¥ÈÎó¤ËÌᤷ¤Þ¤¹. (Æâ¢¥â¥Ç¥à¤ò»ÈÍѤ·¤Æ¤¤¤ë¾ì¹ç¤Ç¤µ¤¨, ¥Ç¡¼¥¿¤Ïº£¤Þ¤ÇÄ̤ê ÉÑÈˤ˥·¥ê¥¢¥ë²½¤µ¤ì¤Þ¤¹) ¤½¤Î¸å¤³¤ì¤é¤Î¥Ð¥¤¥È¤Ï¥Ñ¥±¥Ã¥È¤ËÊÑ´¹¤µ¤ì, Ʊ´üžÁ÷Êý¼°¤òÍѤ¤¤Æ ÅÅÏòóÀþ¤òÄ̤¸¤ÆÁ÷¿®¤µ¤ì¤Þ¤¹. ¤³¤ì¤Ï DTE (¥³¥ó¥Ô¥å¡¼¥¿) Ãæ¤Î UART ¤ÇÄɲ䵤줿¥¹¥È¥Ã¥×, ¥¹¥¿¡¼¥È ¤ª¤è¤Ó¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤Ï, ¥â¥Ç¥à¤«¤éÁ÷¤ê½Ð¤µ¤ì¤ëÁ°¤Ë, ¥â¥Ç¥à¤Ë¤è¤Ã¤Æ ¼è¤ê½ü¤«¤ì¤ë¤È¤¤¤¦¤³¤È¤ò°ÕÌ£¤·¤Þ¤¹. ¤³¤ì¤é¤Î¥Ð¥¤¥ÈÎ󤬥ê¥â¡¼¥È¥â¥Ç¥à¤Ë¼õ¿®¤µ¤ì¤ë¤È, ¥ê¥â¡¼¥È¥â¥Ç¥à¤Ï ¥¹¥¿¡¼¥È, ¥¹¥È¥Ã¥×¤ª¤è¤Ó¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤òÄɲä·¤Æ, ¤½¤ì¤é¤ò ¥·¥ê¥¢¥ë·Á¼°¤ËÊÑ´¹¤·, ¥ê¥â¡¼¥È¥³¥ó¥Ô¥å¡¼¥¿¤Î¼õ¿®Â¦ UART ¤ËÁ÷¤ê¤Þ¤¹. ¤½¤·¤Æ¥ê¥â¡¼¥È¥³¥ó¥Ô¥å¡¼¥¿¤Î UART ¤Ï¥¹¥¿¡¼¥È, ¥¹¥È¥Ã¥×¤ª¤è¤Ó ¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤ò¼è¤ê½ü¤¤Þ¤¹.
¤³¤ì¤é¤ÎÆÃÊ̤ÊÊÑ´¹¤Ï¤¹¤Ù¤Æ, Æó¤Ä¤Î¥â¥Ç¥à¤Î´Ö¤Ç¥¨¥é¡¼ÄûÀµ¤¬ ¼Â¹Ô¤Ç¤¤ë¤è¤¦¤Ë¤¹¤ë¤¿¤á¤ª¤³¤Ê¤ï¤ì¤Æ¤¤¤Þ¤¹. ¥¨¥é¡¼ÄûÀµ¤È¤Ï, ¼õ¿®Â¦¤Î¥â¥Ç¥à¤¬Àµ¤·¤¤¥Á¥§¥Ã¥¯¥µ¥à¤Ç ¼õ¿®¤Ç¤¤Ê¤«¤Ã¤¿¥Ç¡¼¥¿¥Ö¥í¥Ã¥¯¤ÎºÆÁ÷¤ò, Á÷¿®Â¦¤Î¥â¥Ç¥à¤ËÍ׵᤹¤ë¤³¤È¤¬¤Ç¤¤ë¤È¤¤¤¦¤³¤È¤Ç¤¹. ¤³¤Îºî¶È¤Ï¥â¥Ç¥à¤Ë¤è¤ê½èÍý¤µ¤ì¤Æ, DTE ¥Ç¥Ð¥¤¥¹¤Ï ¤³¤Î¤è¤¦¤Ê¥×¥í¥»¥¹¤¬¤ª¤³¤Ê¤ï¤ì¤Æ¤¤¤ë¤³¤È¤Ë, Ä̾ﵤ¤¬¤Ä¤¤Þ¤»¤ó.
¥¹¥¿¡¼¥È, ¥¹¥È¥Ã¥×¤ª¤è¤Ó¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤ò¼è¤ê½ü¤¯¤³¤È¤Ë¤è¤ê, ¥¨¥é¡¼ÄûÀµ¤Î¤¿¤á¤ËÆó¤Ä¤Î¥â¥Ç¥à¤Î´Ö¤Ç¶¦Í¤·¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤ ÄɲäΥӥåȤò, ¼Â¸úžÁ÷®ÅÙ¤òÄã²¼¤µ¤»¤º¤ËÁ÷¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹. ¤½¤Î¤¿¤á, Á÷¼õ¿® DTE ¤Ë¤Ï¥¨¥é¡¼ÄûÀµ¤¬¤ª¤³¤Ê¤ï¤ì¤Æ¤¤¤ë¤«¤É¤¦¤«¤¬ ¤Û¤È¤ó¤É¸«¤¨¤Ê¤¯¤Ê¤ê¤Þ¤¹. Î㤨¤Ð, ¤â¤·¥â¥Ç¥à¤¬ 10 ¸Ä¤Î 7 ¥Ó¥Ã¥È¥Ç¡¼¥¿¤ò¤â¤¦°ìÊý¤Î¥â¥Ç¥à¤ËÁ÷¤ë ºÝ¤Ë, ¥¹¥¿¡¼¥È, ¥¹¥È¥Ã¥×, ¤ª¤è¤Ó¥Ñ¥ê¥Æ¥£¥Ó¥Ã¥È¤òÁ÷¤ëɬÍפ¬¤Ê¤±¤ì¤Ð, ¤½¤Îʬ¤Î 30 ¥Ó¥Ã¥È¤Î¾ðÊó¤ò, ¿¿¤Î¥Ç¡¼¥¿¤ÎžÁ÷®Å٤˱ƶÁ¤òÍ¿¤¨¤ë¤³¤È¤Ê¤¯ ¥¨¥é¡¼ÄûÀµ¤Î¤¿¤á¤ËÄɲ乤뤳¤È¤¬¤Ç¤¤ë¤ï¤±¤Ç¤¹.
¥Ç¡¼¥¿°µ½Ì¤ò¤ª¤³¤Ê¤¦¥â¥Ç¥à¤Ç¤Ï, ¥Ü¡¼¤È¤¤¤¦¸ÀÍդλȤ¤Êý¤Ï ¤µ¤é¤Ëº®Í𤹤뤳¤È¤Ë¤Ê¤ê¤Þ¤¹. Î㤨¤ÐÅÅÏòóÀþ¤òÄ̤¸¤ÆÁ÷¤é¤ì¤¿Æó¤Ä¤Î 8 ¥Ó¥Ã¥È¥Ç¡¼¥¿¤Ï, Á÷¿®Â¦¥â¥Ç¥à¤ËÁ÷¤é¤ì¤¿ 12 ¥Ð¥¤¥È¤Î¥Ç¡¼¥¿¤òɽ¤¹¤«¤â¤·¤ì¤Þ¤»¤ó. ¼õ¿®Â¦¥â¥Ç¥à¤Ï¤½¤Î¥Ç¡¼¥¿¤òËÜÍè¤ÎÆâÍÆ¤ËŸ³«¤·, ¼õ¿®Â¦¤Î DTE ¤ËÅϤ·¤Þ¤¹.
¤Þ¤¿, ºÇ¶á¤Î¥â¥Ç¥à¤Ï¥Ð¥Ã¥Õ¥¡¤òÆâ¢¤·¤Æ¤ª¤ê, (DCE ¤«¤é DCE ¤Ø) ÅÅÏÃÀþ¤ò ή¤ì¤ë¥Ç¡¼¥¿¤ÎžÁ÷®ÅÙ¤È, ξü¤Î DTE ¤È DCE ¤Î´Ö¤Çή¤ì¤ë¥Ç¡¼¥¿¤Î žÁ÷®Å٤ȤòÊÌ¡¹¤ËÀßÄꤹ¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹. ¥â¥Ç¥à¤Ë¤è¤ë°µ½Ì¤ò»ÈÍѤ¹¤ë¾ì¹ç, Ä̾ï¤Ï DTE ¤È DCE ¤Î´Ö¤Î®ÅÙ¤ò DCE ¤È DCE ¤Î´Ö¤Î®ÅÙ¤è¤ê®¤¯¤·¤Æ¤ª¤¤Þ¤¹.
1 ¥Ð¥¤¥È¤òµ½Ò¤¹¤ë¤Î¤ËɬÍפʥӥåȤοô¤Ï, Æó¤Ä¤Î¥Þ¥·¥ó¤Î´Ö¤Ç¤â DTE-DCE ¤È DCE-DCE ¤Î¥ê¥ó¥¯¤Ç¤½¤ì¤¾¤ìÊѲ½¤¹¤ë¾ì¹ç¤¬¤¢¤ê¤Þ¤¹¤·, ¤½¤Î¤¦¤¨, ¤½¤ì¤¾¤ì¤Î¥Ó¥Ã¥ÈžÁ÷®ÅÙ¤¬°Û¤Ê¤ë¾ì¹ç¤â¤¢¤ê¤Þ¤¹. ¤½¤Î¤¿¤á, Á´ÂΤȤ·¤Æ¤ÎÄÌ¿®Â®ÅÙ¤òɽ¸½¤¹¤ë¤¿¤á¤Ë ¥Ü¡¼¤È¤¤¤¦¸ÀÍÕ¤ò»È¤¦¤³¤È¤Ï ÌäÂê¤Ç¤â¤¢¤ê¤Þ¤¹¤·, ¿¿¤ÎžÁ÷®ÅÙ¤òÀµ¤·¤¯ÅÁ¤¨¤Ê¤¤¾ì¹ç¤¬¤¢¤ê¤Þ¤¹. 1 É䢤¿¤ê¤ÎžÁ÷¥Ó¥Ã¥È¿ô (bps) ¤Ï DCE ¤È DCE ¤Î´Ö¤Î¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤Ë ¤ª¤±¤ëžÁ÷®ÅÙ¤òµ½Ò¤¹¤ë¤¿¤á¤Ë»È¤¦¤Ê¤éÀµ¤·¤¤ÍѸì¤Ç¤¹¤·, ¥Ü¡¼¤Þ¤¿¤Ï 1 É䢤¿¤ê¤Î¥Ó¥Ã¥È¿ô¤Ï, Æó¤Ä¤Î¥·¥¹¥Æ¥à¤¬ÅÅÀþ¤ÇľÀÜ Àܳ¤µ¤ì¤Æ¤¤¤¿¤ê, ¥¨¥é¡¼ÄûÀµ¤ä°µ½Ì¤ò¤ª¤³¤Ê¤ï¤Ê¤¤¥â¥Ç¥à¤¬ »È¤ï¤ì¤Æ¤¤¤ë¾ì¹ç¤Ë¤Ï, µöÍÆ²Äǽ¤ÊÍѸì¤Ç¤¹.
ºÇ¶á¤Î¹â®¥â¥Ç¥à (2400, 9600, 14,400, 19,200bps ¤Ê¤É¤Î¤â¤Î) ¤â, ¼ÂºÝ¤Ë¤Ï 2,400 ¥Ü¡¼ (Àµ³Î¤Ë¤Ï 2,400 ¥·¥ó¥Ü¥ë/ÉÃ) ¤«, ¤½¤ì°Ê²¼¤Î ®ÅÙ¤ÇÄÌ¿®¤·¤Æ¤¤¤Þ¤¹. ¹â®¥â¥Ç¥à¤Ç¤Ï, Ê£¿ô¤Î¥Ó¥Ã¥È¤ò°ì¤Ä¤Î¥·¥ó¥Ü¥ë¤Ç ÅÁÁ÷¤¹¤ëµ»½Ñ (¿ÃÍÉä¹ç²½¤Ê¤É) ¤òÍѤ¤¤Æ, ¥·¥ó¥Ü¥ë®ÅÙ (¥·¥ó¥Ü¥ë/ÉÃ) ¤è¤ê¤â ¹â¤¤ÄÌ¿®Â®ÅÙ (¥Ó¥Ã¥È/ÉÃ) ¤òãÀ®¤·¤Æ¤¤¤Þ¤¹. ¤³¤ì¤¬ÅÅÏäθ¤é¤ì¤¿²»À¼ÂÓ°è¤Ç ¹â¤¤ÅÁÁ÷®ÅÙ¤òÆÀ¤é¤ì¤ëÍýͳ¤Ç¤¹. 28,800bps ¤ä¤½¤ì°Ê¾å¤Î¥â¥Ç¥à¤Ç¤Ï, ¥·¥ó¥Ü¥ë®ÅÙ¼«ÂΤ¬ ²ÄÊѤˤʤäƤ¤¤Þ¤¹¤¬, ¤½¤ì°Ê³°¤ÏƱÍͤε»½Ñ¤¬ÍѤ¤¤é¤ì¤Æ¤¤¤Þ¤¹.
¸µÁÄ IBM PC ¤òÀ߷פ·¤¿ºÝ¤Ë, IBM ¤Ï¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¼Ò¤Î INS8250 UART ¤ò IBM PC ¥Ñ¥é¥ì¥ë/¥·¥ê¥¢¥ë¥¢¥À¥×¥¿¤Ç»ÈÍѤ¹¤ë¤³¤È¤Ë ·è¤á¤Þ¤·¤¿.
IBM ¼«¿È¤ä¤½¤Î¾¤Î¥Ù¥ó¥À¤¬ºî¤Ã¤Æ¤¤¤ë¸å·ÑÀ¤Âå¤Î AT ¸ß´¹µ¡¤Ç¤â, INS8250 ¤½¤Î¤â¤Î¤ä¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¤Î UART ¥Õ¥¡¥ß¥ê¤Î ²þÎÉÈǤò»È¤¤Â³¤±¤é¤ì¤Æ¤¤¤Þ¤¹.
INS8250 UART ¤Ë¤Ï¤¤¤¯¤Ä¤«¤Î¥Ð¡¼¥¸¥ç¥ó¤È¸å·Ñ¤ÎÉôÉʤ¬¤¢¤ê¤Þ¤¹. ¼çÍפʥС¼¥¸¥ç¥ó¤ò°Ê²¼¤Ë¼¨¤·¤Þ¤¹.
INS8250 -> INS8250B \ \ \-> INS8250A -> INS82C50A \ \ \-> NS16450 -> NS16C450 \ \ \-> NS16550 -> NS16550A -> PC16550D
¤³¤ÎÉôÉʤϸµÁÄ IBM PC ¤È IBM PC/XT ¤Ç »È¤ï¤ì¤Æ¤¤¤Þ¤·¤¿. ¤³¤ÎÉôÉʤÏËÜÍè INS8250 ACE (Asynchronous Communications Element) ¤È ¤¤¤¦Ì¾Á°¤Ç, NMOS µ»½Ñ¤Çºî¤é¤ì¤Æ¤¤¤Þ¤·¤¿.
8250 ¤ÏȬ¤Ä¤Î I/O ¥Ý¡¼¥È¤òÀêͤ·, Á÷¿®¥Ð¥Ã¥Õ¥¡ 1 ¥Ð¥¤¥È¤È ¼õ¿®¥Ð¥Ã¥Õ¥¡ 1 ¥Ð¥¤¥È¤ò»ý¤Ã¤Æ¤¤¤Þ¤¹. ¤³¤Î¸µÁĤΠUART ¤Ï¤¤¤¯¤Ä¤«¤Î ¶¥¹ç¾õÂ֤ʤɤ˴ؤ¹¤ë·ç´Ù¤ò»ý¤Ã¤Æ¤¤¤Þ¤¹. ¸µÁĤΠIBM BIOS ¤Ï¤³¤ì¤é¤Î·ç´Ù¤ò²óÈò¤·¤Æ¤¦¤Þ¤¯Æ°¤¯¤è¤¦¤Ê¥³¡¼¥É¤ò ´Þ¤ó¤Ç¤¤¤Þ¤·¤¿¤¬, ¤½¤Î¤¿¤á¤Ë BIOS ¤¬·ç´Ù¤Î¸ºß¤Ë°Í¸¤¹¤ë¤è¤¦¤Ë ¤Ê¤Ã¤Æ¤·¤Þ¤¤¤Þ¤·¤¿. ¤³¤Î¤¿¤á, ¸µÁÄ IBM PC ¤ä IBM PC/XT ¤Ç¤Ï 8250A, 16450, ¤Þ¤¿¤Ï 16550 ¤Î¤è¤¦¤Ê¸å·ÑÉôÉʤò»È¤¦¤³¤È¤Ï ¤Ç¤¤Þ¤»¤ó¤Ç¤·¤¿.
¤³¤ì¤Ï NMOS µ»½Ñ¤Çºî¤é¤ì¤¿ INS8250 ¤ÎÄã®ÈǤǤ¹. ¤³¤ì¤â¥ª¥ê¥¸¥Ê¥ë¤Î INS8250 ¤ÈƱ¤¸ÌäÂê¤ò´Þ¤ó¤Ç¤¤¤Þ¤¹.
XMOS µ»½Ñ¤ò»È¤¤, ¤µ¤Þ¤¶¤Þ¤Êµ¡Ç½Åª·ç´Ù¤ò½¤Àµ¤·¤¿ INS8250 ¤Î²þÎÉÈǤǤ¹. INS8250A ¤ÏÅö½é, ``¥¯¥ê¡¼¥ó''¤Ê BIOS ¤ò »ÈÍѤ·¤¿¥Ù¥ó¥À¤Î PC ¥¯¥í¡¼¥ó¤Ç»ÈÍѤµ¤ì¤Æ¤¤¤Þ¤·¤¿. ¤Ê¤¼¤Ê¤é·ç´Ù¤¬½¤Àµ¤µ¤ì¤¿¤³¤È¤Ë¤è¤ê, ¤³¤ÎÉôÉÊ¤Ï INS8250 ¤ä INS8250B ¤Î ¤¿¤á¤Ë½ñ¤«¤ì¤¿ BIOS ¤Ç»È¤¦¤³¤È¤Ï¤Ç¤¤Ê¤«¤Ã¤¿¤«¤é¤Ç¤¹.
¤³¤ì¤Ï INS8250A ¤Î CMOS ÈÇ (Äã¾ÃÈñÅÅÎÏÈÇ) ¤Ç, INS8250A ¤ÈƱ¤¸µ¡Ç½ÆÃÀ¤ò»ý¤Ã¤Æ¤¤¤Þ¤¹.
¤è¤ê¹â®¤Ê CPU ¥Ð¥¹¤Ë¤âÂбþ¤Ç¤¤ë¤è¤¦¤Ë ²þÎɤµ¤ì¤¿¤³¤È°Ê³°¤Ï NS8250A ¤ÈƱ¤¸¤Ç¤¹. IBM ¤Ï¤³¤ÎÉôÉʤò IBM AT ¤Ç»È¤¦¤³¤È¤Ë·è¤á, ¤â¤Ï¤ä IBM BIOS ¤¬ INS8250 ¤Î¥Ð¥°¤Ë°Í¸¤·¤Ê¤¯¤Ê¤ë¤è¤¦¤Ë Êѹ¹¤ò¤ª¤³¤Ê¤¤¤Þ¤·¤¿.
¤³¤ì¤Ï NS16450 ¤Î CMOS ÈÇ (Äã¾ÃÈñÅÅÎÏÈÇ) ¤Ç¤¹.
Á÷¿®¥Ð¥Ã¥Õ¥¡¤È¼õ¿®¥Ð¥Ã¥Õ¥¡¤ò¤½¤ì¤¾¤ì 16 ¥Ð¥¤¥È¤Ë Êѹ¹¤·¤¿¤³¤È°Ê³°¤Ï NS16450 ¤ÈƱ¤¸¤Ç¤¹¤¬, ¥Ð¥Ã¥Õ¥¡¤ÎÀß·×¤Ë ·ç´Ù¤¬¤¢¤ë¤¿¤á, ¿®Íꤷ¤Æ»ÈÍѤ¹¤ë¤³¤È¤Ï¤Ç¤¤Þ¤»¤ó.
¥Ð¥Ã¥Õ¥¡¤Î·ç´Ù¤¬½¤Àµ¤µ¤ì¤¿¤³¤È°Ê³°¤Ï NS16550 ¤È Ʊ¤¸¤Ç¤¹. ³ä¤ê¹þ¤ß¤Ø¤ÎÈ¿±þ¤¬ÃÙ¤¤ OS ¤Ç¤â¹â¤¤¿®ÍêÀ¤Ç¹â®¤Ê¥Ç¡¼¥¿¤ò °·¤¦¤³¤È¤¬¤Ç¤¤ë¤³¤È¤«¤é, 16550A ¤È¤½¤Î¸å·ÑÉôÉÊ¤Ï PC »º¶È³¦¤Ç ºÇ¤â°ìÈÌŪ¤Ë»È¤ï¤ì¤ë UART ¤È¤Ê¤ê¤Þ¤·¤¿.
¤³¤ì¤Ï 2 ¸Ä¤Î NS16C550A CMOS UART¤ò °ì¤Ä¤Î¥Ñ¥Ã¥±¡¼¥¸¤ËÆþ¤ì¤¿ÉôÉʤǤ¹.
¤µ¤µ¤¤¤Ê·ç´Ù¤¬½¤Àµ¤µ¤ì¤¿¤³¤È°Ê³°¤Ï NS16550A ¤È Ʊ¤¸¤Ç¤¹. ¤³¤ì¤Ï 16550 ¥Õ¥¡¥ß¥ê¤Î D ¥ê¥Ó¥¸¥ç¥ó¤Ç, ¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¼Ò¤«¤é Ä󶡤µ¤ì¤Æ¤¤¤ëºÇ¿·¤ÎÉôÉʤǤ¹.
( ¤³¤³¤«¤é¤Ï ´äºê Ëþ <iwasaki@jp.FreeBSD.ORG> ¤¬ËÝÌõ¤òôÅö)
¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¤Ï ¿ôǯÁ°¤ËÉôÉÊÈÖ¹æÂηϤòºÆÊÔÀ®¤·¤Æ ¤ª¤ê, NS16550AFN ¤È¤¤¤¦Ì¾¾Î¤Ï¤â¤Ï¤ä¸ºß¤·¤Þ¤»¤ó. (¤â¤·¤¢¤Ê¤¿¤¬ NS16550AFN ¤ò»ý¤Ã¤Æ¤¤¤¿¤é, ÉôÉÊ¤ÎÆüÉÕ¥³¡¼¥É¤ò¸«¤Æ¤¯¤À¤µ¤¤. ¤½¤ì¤Ï Ä̾ï 9 ¤«¤é»Ï¤Þ¤ë4·å¤Î¿ô»ú¤Ç¤¹. ºÇ½é¤Î2·å¤Î¿ô»ú¤ÏǯÅÙ, ¼¡¤Î2·å ¤ÏÉôÉʤ¬¥Ñ¥Ã¥±¡¼¥¸¤µ¤ì¤¿Ç¯Å٤νµ¤Ç¤¹. ¤¢¤Ê¤¿¤Î»ý¤Ã¤Æ¤¤¤ë NS16550AFN ¤Ï, ¤ª¤½¤é¤¯¿ôǯÁ°¤Î¤â¤Î¤Ç¤·¤ç¤¦.)
¿·¤·¤¤ÈÖ¹æ¤Ï PC16550DV ¤ÎÍͤË, ¥Ñ¥Ã¥±¡¼¥¸ºàÎÁ¤È·Á¾õ¤Ë¤è¤êÀÜÈø¼ ¤Ë¾®¤µ¤Ê°ã¤¤¤¬¤¢¤ê¤Þ¤¹ (ÈÖ¹æÂηϤˤĤ¤¤Æ¤Îµ½Ò¤Ï¸å½Ò¤·¤Þ¤¹).
¤³¤³¤ÇÃí°Õ¤·¤Ê¤±¤ì¤Ð¤¤¤±¤Ê¤¤¤³¤È¤¬¤¢¤ê¤Þ¤¹. Î㤨¤Ð, ¤¢¤ëŹ¤Ë¹Ô¤Ã¤Æ 1990ǯÀ½¤Î NS16550AFN ¤ò15ÊÆ¥É¥ë¤ÇÇä¤Ã¤Æ¤¤¤ë¤È¤·¤Þ¤¹. ¤È¤³¤í¤¬, ¤½¤Î¤¹¤°ÎÙ¤Ë¤Ï ¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¤¬ AFN ¤òÀ¸»º³«»Ï¤·¤Æ¤«¤é ¤½¤ì¤Ë¥Þ¥¤¥Ê¡¼¤ÊÊѹ¹¤ò²Ã¤¨¤Æºî¤Ã¤¿ PC16550DN ¤¬¤¢¤ê, ¤½¤Á¤é¤Ï ºÇ¶á 6¥ö·î¤Ëºî¤é¤ì¤¿¤â¤Î¤Ê¤Î¤Ë, ´Êñ¤ËÆþ¼ê¤Ç¤¤ë¤¿¤á NS16550AFN ¤Î Ⱦ³Û (¤¿¤¯¤µ¤ó°ìÅÙ¤ËÇ㤦¤È 5ÊÆ¥É¥ë¤Þ¤Ç²¼¤¬¤ë¤³¤È¤â¤¢¤ê¤Þ¤¹) °Ì¤Ç Ç㤨¤¿¤ê¤¹¤ë¤³¤È¤¬¤¢¤ë¤Î¤Ç¤¹.
NS16550AFN ¤Î¥Á¥Ã¥×¶¡µë¤Ï¸º¾¯¤·Â³¤±¤Æ¤¤¤ë¤¿¤á, PC16550DN ¤¬¸Å¤¤ ÉôÉÊÈÖ¹æ¤Î¤â¤Î¤È¤Þ¤Ã¤¿¤¯Æ±¤¸µ¡Ç½¤ò»ý¤Ã¤Æ¤¤¤ë¤³¤È¤Ë, ¤è¤ê¿¤¯¤Î¿Í¤¬ µ¤ÉÕ¤¤¤Æ¼õ¤±Æþ¤ì¤ë¤Þ¤Ç¤Ï, ²Á³Ê¤Ï¤ª¤½¤é¤¯¾å¾º¤·Â³¤±¤ë¤Ç¤·¤ç¤¦.
¸Å¤¤ NSnnnnnrqp ¤ÎÉôÉÊÈÖ¹æ¤Ï, ¸½ºß PCnnnnnrgp ¤È¤¤¤¦¥Õ¥©¡¼¥Þ¥Ã¥È¤Ë¤Ê¤Ã¤Æ¤¤¤Þ¤¹.
r ¤Ï¥ê¥Ó¥¸¥ç¥ó¤Î¥Õ¥£¡¼¥ë¥É¤Ç¤¹. ¸½ºß¤Î¥Ê¥·¥ç¥Ê¥ë¥» ¥ß¥³¥ó¥À¥¯¥¿¤Î 16550 ¤Î¥ê¥Ó¥¸¥ç¥ó¤ÏD¤Ç¤¹.
p ¤Ï¥Ñ¥Ã¥±¡¼¥¸¥¿¥¤¥×¤Î¥Õ¥£¡¼¥ë¥É¤Ç¤¹. ¥¿¥¤¥×¤Ï°Ê²¼ ¤ÎÄ̤ê¤Ç¤¹:
"F" | QFP | (quad flat pack) L lead type |
"N" | DIP | (dual inline package) through hole straight lead type |
"V" | LPCC | (lead plastic chip carrier) J lead type |
ÌõÃí: ¶ñÂÎŪ¤Ê¥Ñ¥Ã¥±¡¼¥¸·Á¾õ¤Ë¤Ä¤¤¤Æ¤Î¾ðÊó¤Ï http://www.national.com/packaging/plastic.html ¤ò»²¾È ¤·¤Æ¤¯¤À¤µ¤¤.
g ¤ÏÀ½ÉÊ¥°¥ì¡¼¥É¤Î¥Õ¥£¡¼¥ë¥É¤Ç¤¹. ¤â¤·¥Ñ¥Ã¥±¡¼¥¸¥¿¥¤ ¥×¤Îʸ»ú¤ÎÁ°¤ËI¤¬¤¢¤ì¤Ð, ``¹©¶ÈÍÑ''¥°¥ì¡¼¥ÉÉôÉʤòɽ¤·, ɸ½à ÉôÉʤè¤ê¹â¤¤¥¹¥Ú¥Ã¥¯¤ò»ý¤Á¤Þ¤¹¤¬, Miltary »ÅÍÍ (Milspec) ¤Û¤É¹â ¤¯¤Ï¤¢¤ê¤Þ¤»¤ó. ¤³¤ì¤ÏÉÕ²ÃŪ¤Ê¥Õ¥£¡¼¥ë¥É¤Ç¤¹.
»ä¤¿¤Á¤¬¤«¤Ä¤Æ NS16550AFN (DIP ¥Ñ¥Ã¥±¡¼¥¸) ¤È¸Æ¤ó¤Ç¤¤¤¿¤â¤Î¤Ï, ¸½ºß ¤Ï PC16550DN ¤Þ¤¿¤Ï PC16550DIN ¤È¸Æ¤Ð¤ì¤Æ¤¤¤Þ¤¹.
Ĺǯ¤ËÅϤê, 8250, 8250A, 16450 ¤½¤·¤Æ 16550 ¤Ï¥é¥¤¥»¥ó¥¹¤µ¤ì, ¤Þ¤¿¤Ï¾¤Î¥Á¥Ã¥×¥Ù¥ó¥À¤Ë¥³¥Ô¡¼¤µ¤ì¤Æ¤¤Þ¤·¤¿. 8250, 8250A ¤½¤·¤Æ 16450 ¤Î¾ì¹ç¤Ï, ¤½¤Î¤â¤Î¤Î²óÏ© (``megacell'': LSI¤ÎÃæ¤ËÁȤ߹þ¤à ¤³¤È¤Î¤Ç¤¤ë¥é¥¤¥Ö¥é¥ê²½¤µ¤ì¤¿²óÏ©¤ÎÂ絬ÌϤÊʪ) ¤¬ Western Digital ¤È Intel ¤ò´Þ¤à¤¿¤¯¤µ¤ó¤Î¥Ù¥ó¥À¤Ë¥é¥¤¥»¥ó¥¹¤µ¤ì¤Þ¤· ¤¿. ¾¤Î¥Ù¥ó¥À¤ÏÉôÉʤò ¥ê¥Ð¡¼¥¹¥¨¥ó¥¸¥Ë¥¢¥ê¥ó¥°¤·¤¿Êª¤«Æ±¤¸¤è¤¦¤Ë ưºî¤¹¤ë¸ß´¹ÉʤòÀ½Â¤¤·¤Þ¤·¤¿.
Æâ¢¥â¥Ç¥à¤Ë¤ª¤¤¤Æ¤Ï, ¥â¥Ç¥àÀ߷׼Ԥϥâ¥Ç¥à¤Î¥Þ¥¤¥¯¥í¥×¥í¥»¥Ã¥µ¤Ç 8250A/16450 ¤ò¥¨¥ß¥å¥ì¡¼¥È¤¹¤ë¤³¤È¤Ï¤è¤¯¤ª¤³¤Ê¤ï¤ì¤Þ¤¹. ¤³¤Î¥¨¥ß¥å¥ì¡¼¥È ¤Ë¤è¤ë (¸ß´¹¤Î) UART ¤Ï¿ôÉ´¥Ð¥¤¥È¤Î±£¤ì¤¿¥Ð¥Ã¥Õ¥¡¤ò»ý¤Ä¤Ç¤·¤ç¤¦. ¥Ð¥Ã¥Õ¥¡¤Î¥µ¥¤¥º¤Î¤¿¤á, ¤³¤Î¤è¤¦¤Ê¸ß´¹ÉʤϹ⮥ǡ¼¥¿½èÍý¤ÎǽÎÏ¤Ç¤Ï 16550A ¤ÈÊѤï¤é¤Ê¤¤¿®ÍêÀ¤ò»ý¤Ä¤³¤È¤¬¤Ç¤¤Þ¤¹. ¤·¤«¤·, ¤½¤ì¤Ç¤â ¤Û¤È¤ó¤É¤Î¥ª¥Ú¥ì¡¼¥Æ¥£¥ó¥°¥·¥¹¥Æ¥à¤Ï UART ¤Ï 8250A ¤« 16450 ¤Ç¤¢¤ë ¤ÈÊó¹ð¤·, ÆÃ¼ì¤Ê¥É¥é¥¤¥Ð¤¬»ÈÍѤµ¤ì¤Ê¤±¤ì¤Ð ¥¨¥ß¥å¥ì¡¼¥È¤Ë¤è¤ë UART ¤Î;ʬ¤Ë¸ºß¤¹¤ë ¥Ð¥Ã¥Õ¥¡¥ê¥ó¥°¤Î¸ú²ÌŪ¤Ê»ÈÍѤϤª¤³¤Ê¤¤¤Þ¤»¤ó.
´ö¤Ä¤«¤Î¥â¥Ç¥à¥á¡¼¥«¡¼¤Ï, »Ô¾ì¤Ë¤ª¤±¤ë¶¥Áè¤òÍÍø¤Ë¤¹¤ë¤¿¤á¤Ë¿ôÉ´¥Ð ¥¤¥È¤Î¥Ð¥Ã¥Õ¥¡¤ò»ý¤Á 16550A ¤ÎÃÖ¤´¹¤¨¤¬¤Ç¤¤ë¤Ï¤º¤ÎÀ߷פò, ¤¿¤È¤¨ Àǽ¤¬Äã²¼¤¹¤ë»ö¤Ë¤Ê¤Ã¤¿¤È¤·¤Æ¤â ´þ¤Æ¤¶¤ë¤òÆÀ¤Ê¤¯¤Ê¤ë¤è¤¦¤Ê»Ô¾ì¤Î°µ ÎϤò¼õ¤±¤Æ¤¤¤Þ¤¹.
°ìÈÌŪ¤Ë¤¢¤ë¸í²ò¤Ï, ``16550A'' ¤È½ñ¤«¤ì¤¿¤¹¤Ù¤Æ¤ÎÉôÉʤ¬Æ±¤¸Àǽ¤Ç¤¢¤ë¤È ¤¤¤¦¤³¤È¤Ç¤¹. ¤½¤ì¤é¤Ï°Û¤Ê¤ë¤â¤Î¤Ç¤¢¤ê, ¾õ¶·¤Ë¤è¤Ã¤Æ¤Ï¤Þ¤Á¤¬¤¤¤Ê¤¯ ·ç´Ù¤È¸Æ¤Ù¤ë¤â¤Î¤¬¤³¤ì¤é¤Î 16550A ¥¯¥í¡¼¥ó¤Î¤Û¤È¤ó¤É¤Ë¤¢¤ê¤Þ¤¹.
NS16550 ¤¬³«È¯¤µ¤ì¤¿»þ¤Ë, ¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¤ÏÀ߷פ˴ؤ¹¤ë ´ö¤Ä¤«¤ÎÆÃµö¤ò¼èÆÀ¤·, Èà¤é¤Ï¥é¥¤¥»¥ó¥¹¤òÀ©¸Â¤·¤ÆÂ¾¤Î¥Ù¥ó¥À¤¬Îà»÷ ¤ÎÆÃħ¤ò»ý¤Ä¥Á¥Ã¥×¤ò¶¡µë¤¹¤ë¤³¤È¤òº¤Æñ¤Ë¤·¤Þ¤·¤¿. ÆÃµö¤Î¤¿¤á, ¥ê¥Ð¡¼ ¥¹¥¨¥ó¥¸¥Ë¥¢¥ê¥ó¥°¤Ë¤è¤ëÀ߷פȥ¨¥ß¥å¥ì¡¼¥·¥ç¥ó¤Ï, ÆÃµö¤¬¥«¥Ð¡¼¤¹¤ë ÀÁµá¸¢¤ò¿¯³²¤ò²óÈò¤·¤Ê¤¯¤Æ¤Ï¤Ê¤ê¤Þ¤»¤ó¤Ç¤·¤¿. ·ë²Ì¤È¤·¤Æ, ¤³¤ì¤é¤Î ¥³¥Ô¡¼¤Î¤Û¤È¤ó¤É¤Ï, ¿¤¯¤Î¥³¥ó¥Ô¥å¡¼¥¿¤È¥â¥Ç¥à¤Î¥á¡¼¥«¡¼¤Ï»Ùʧ¤¤¤¿ ¤¯¤Ï¤Ê¤¤Äø¤Î²Á³Ê¤Ç¤¢¤Ã¤¿ËÜʪ¤ÎÉôÉʤΠNS16550A ¤Þ¤¿¤Ï PC16550D ¤È¤Þ¤Ã¤¿ ¤¯Æ±¤¸¤è¤¦¤Êưºî¤ò¤µ¤»¤ë¤³¤È¤Ï¤Ç¤¤Þ¤»¤ó¤Ç¤·¤¿.
16550A ¤Î¥¯¥í¡¼¥ó¤Ë¸ºß¤¹¤ëÁê°ãÅÀ¤Î¤¦¤Á ¤¤¤¯¤Ä¤«¤Ïº³ºÙ¤Ê¤â¤Î¤Ç¤¹¤¬, ¤½¤Î¤Û¤«¤Ë ÆÃÄê¤Î¥ª¥Ú¥ì¡¼¥Æ¥£¥ó¥°¥·¥¹¥Æ¥à¤ä¥É¥é¥¤¥Ð¤Ç¤Ï Á´Á³»È¤¤¤â¤Î¤Ë¤Ê¤é¤Ê¤¤¤è¤¦¤ÊÁê°ã¤¬Â¸ºß¤¹¤ë¾ì¹ç¤â¤¢¤ê¤Þ¤¹. ¤¢¤ë¥É¥é¥¤¥Ð¤Ç¤ÏÌäÂê¤Ê¤¯Æ°ºî¤·¤Æ¤â, Ê̤Υɥ饤¥Ð¤ò»ÈÍѤ·¤¿¾ì¹ç¤Ë¤Ï ÌäÂ꤬ȯÀ¸¤¹¤ë¤³¤È¤â¤¢¤ê¤Þ¤¹¤·, Windows ¤Î¥É¥é¥¤¥Ð¤Ë¤ª¤¤¤Æ¤â ½¼Ê¬¤Ë¥Æ¥¹¥È¤ä¹Í褬¤ª¤³¤Ê¤ï¤ì¤Ê¤«¤Ã¤¿¥¤¥Ù¥ó¥È¤ÎÁȹç¤ï¤»¤¬ µ¯¤³¤Ã¤¿¾ì¹ç¤Ë¤Ï, ¤³¤ì¤é¤ÎÁê°ãÅÀ¤¬ÌÀ¤é¤«¤Ë¤Ê¤ë¤«¤â¤·¤ì¤Þ¤»¤ó. ¤³¤ì¤Ï¤Û¤È¤ó¤É¤Î¥â¥Ç¥à¥Ù¥ó¥À¤È 16550 ¥¯¥í¡¼¥ó¥á¡¼¥«¡¼¤¬, NS16550A ¤È¤Î¸ß´¹À¤Î¥×¥é¥¤¥Þ¥ê¥Æ¥¹¥È¤È¤·¤Æ Windows for Workgroups 3.11 ¤È Microsoft MSD ¥æ¡¼¥Æ¥£¥ê¥Æ¥£¤Î Microsoft ¥É¥é¥¤¥Ð¤ò»ÈÍѤ·¤Æ¤¤¤ë¤« ¤é¤Ç¤¹. ¤³¤Î°Â°×²á¤®¤ëµ¬½à¤Ï, ¤â¤·°Û¤Ê¤ë¥ª¥Ú¥ì¡¼¥Æ¥£¥ó¥°¥·¥¹¥Æ¥à¤¬ »ÈÍѤµ¤ì¤¿¤é¥¯¥í¡¼¥ó¤È ËÜʪ¤ÎÉôÉʤÎÈù̯¤Ê°ã¤¤¤Î¤¿¤á¤ËÌäÂ꤬ȯÀ¸¤·ÆÀ ¤ë, ¤È¤¤¤¦¤³¤È¤ò°ÕÌ£¤·¤Æ¤¤¤Þ¤¹.
¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¤Ï, ¤É¤ó¤Ê OS ¤Î¥É¥é¥¤¥Ð¤«¤é¤âÆÈΩ¤·¤¿¸ß ´¹À¥Æ¥¹¥È¤ò¼Â¹Ô¤¹¤ë COMTEST ¤È¤¤¤¦Ì¾Á°¤ÎÆþ¼ê²Äǽ¤Ê¥×¥í¥°¥é¥à¤òºî À®¤·¤Þ¤·¤¿. ¤³¤Î¥¿¥¤¥×¤Î¥×¥í¥°¥é¥à¤ÎÌÜŪ¤Ï, ¶¥¹çÀ½Éʤˤ¢¤ë·ç´Ù¤Î¥Ç ¥â¥ó¥¹¥È¥ì¡¼¥·¥ç¥ó¤Ç¤¢¤ë¤³¤È¤ò¤ª¤Ü¤¨¤Æ¤ª¤¯¤Ù¤¤Ç¤¹. ¤Ç¤¹¤«¤é¤½¤Î¥× ¥í¥°¥é¥à¤Ï, ¥Æ¥¹¥ÈÃæ¤ÎÉôÉÊ¤ÎÆ°ºî¤Î½ÅÍפÊÌäÂê¤È¶Ë¤á¤Æ¤µ¤µ¤¤¤ÊÁê°ã¤ò Ʊ¤¸¤è¤¦¤ËÊó¹ð¤¹¤ë¤Ç¤·¤ç¤¦.
¤³¤Îʸ½ñ¤ÎÃø¼Ô¤¬ 1994 ǯ¤Ë¼Â¹Ô¤·¤¿°ìÏ¢¤Î¥Æ¥¹¥È¤Ç¤Ï, ¥Ê¥·¥ç¥Ê¥ë¥»¥ß ¥³¥ó¥À¥¯¥¿, TI, StarTech ¤½¤·¤Æ CMD ¤¬À½Â¤¤·¤¿ÉôÉÊ¤Ï megacell µÚ¤Ó COMTEST ¤Ç¥Æ¥¹¥È¤µ¤ì¤¿Æâ¢¥â¥Ç¥à¤ËËä¤á¹þ¤Þ¤ì¤¿¥¨¥ß¥å¥ì¡¼¥·¥ç¥ó¤ÈƱ Åù¤Ç¤¹. ¤³¤ì¤é¤ÎÉôÉʤΤδö¤Ä¤«¤ÇÃíÌܤµ¤ì¤ëÁê°ãÅÀ¤ò°Ê²¼¤Ë¼¨¤·¤Þ¤¹. ¤³¤ì¤é¤Î¥Æ¥¹¥È¤Ï1994ǯ¤Ë¼Â¹Ô¤µ¤ì¤¿¤Î¤Ç, ¤³¤ì¤é¤Ï¥Ù¥ó¥À¤«¤é¶¡µë¤µ ¤ì¤¿À½Éʤθ½ºß¤ÎÀǽ¤Ë¤ÏÈ¿±Ç¤µ¤ì¤Ê¤¤¤Ç¤·¤ç¤¦.
¶Ëü¤Ë¿¤¯¤ÎÌäÂê¤ä¤¢¤ë¥¿¥¤¥×¤ÎÌäÂ꤬¸¡½Ð¤µ¤ì¤¿¾ì¹ç¤Ë, COMTEST ¤ÏÄÌ ¾ï¤Ï¼Â¹Ô¤òÃæ»ß¤¹¤ë¤³¤È¤ËÃí°Õ¤·¤Æ¤¯¤À¤µ¤¤. ¤³¤Î¥Æ¥¹¥È¤Î°ìÉô¤Ç¤Ï, ¤¿¤È ¤¨²¿²óÁê°ãÅÀ¤ËÁø¶ø¤·¤Æ¤âÃæ»ß¤·¤Ê¤¤¤è¤¦¤Ë COMTEST ¤ò½¤Àµ¤·¤Þ¤·¤¿.
¥Ù¥ó¥À | ÉôÉÊÈÖ¹æ | Êó¹ð¤µ¤ì¤¿¡ÖÁê°ãÅÀ¡×¤È¤·¤ÆÃΤé¤ì¤ë¥¨¥é¡¼ |
---|---|---|
National | (PC16550DV) | 0 |
National | (NS16550AFN) | 0 |
National | (NS16C552V) | 0 |
TI | (TL16550AFN) | 3 |
CMD | (16C550PE) | 19 |
StarTech | (ST16C550J) | 23 |
Rockwell | Reference modem with internal 16550 or an emulation (RC144DPi/C3000-25) | 117 |
Sierra | Modem with an internal 16550 (SC11951/SC11351) | 91 |
Note: ¤³¤Îʸ½ñ¤ÎÃø¼Ô¤Ïº£¤Þ¤Ç, COMTEST ¥×¥í¥°¥é¥à¤ò »ÈÍѤ·¤ÆÁê°ãÅÀ¤¬¥¼¥í¤ÈÊó¹ð¤µ¤ì¤ë¥Ê¥·¥ç¥Ê¥ë¡¦ ¥»¥ß¥³¥ó¥À¥¯¥¿°Ê³°¤ÎÉôÉʤò°ì¤Ä¤âȯ¸«¤·¤Þ¤»¤ó¤Ç¤·¤¿. ¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¤ÏĹǯ¤ËÅϤê 16550 ¤Î¸Þ¤Ä¤Î¥Ð¡¼¥¸¥ç¥ó¤ò»ý¤Ã¤Æ¤ª¤ê, ºÇ¿·¤ÎÉôÉÊ¤Ï µ¡Ç½À¤Î¤¿¤á¤Ë, ¥Ù¥ó¥Á¥Þ¡¼¥¯¤ò¹Íθ¤·¤¿¸Å¤¤ NS16550AFN ¤È¾¯¤·°Û¤Ê¤ë¿¶¤ëÉñ¤¤¤ò¤¹¤ë¤³¤È¤Ë Ãí°Õ¤¹¤ë¤Ù¤¤Ç¤¹. COMTEST ¤Ï¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¤ÎÀ½Éʥ饤¥ó¤Î Áê°ãÅÀ¤Ë¤Ä¤¤¤Æ¤Ï¸«¤Æ¸«¤Ì¤Õ¤ê¤ò¤¹¤ë¤è¤¦¤Ë¤Ê¤ê, ÉôÉʤΥê¥Ó¥¸¥ç¥ó A, B ¤½¤·¤Æ C ¤Ë¤¢¤ë¥Ð¥°¤¬ µ½Ò¤µ¤ì¤Æ¤¤¤ë¸ø¼°¤ÊÀµ¸íɽ¤¬¤¢¤ë»þ¤Ç¤â, (¥ª¥ê¥¸¥Ê¥ë¤Î 16550 ¤ò½ü¤¤¤Æ¤Ï) ¥Ê¥·¥ç¥Ê¥ë¡¦ ¥»¥ß¥³¥ó¥À¥¯¥¿¤ÎÉôÉʤˤĤ¤¤Æ¥¨¥é¡¼¤ò Êó¹ð¤·¤Ê¤¯¤Ê¤Ã¤¿¤Î¤Ç, ¤³¤Î COMTEST ¤Î¤Ò¤¤¤¤ò ¹Íθ¤Ë¤¤¤ì¤ë¤Ù¤¤Ç¤¹.
COMTEST ¤«¤é¤ÎÁê°ãÅÀ¤Îñ½ã¤Ê¥«¥¦¥ó¥È¤¬, ²¿¤ÎÁê°ãÅÀ¤¬½ÅÍפǤ¢¤ê ¤É¤ì¤¬¤½¤¦¤Ç¤Ê¤¤¤Î¤«¤Ë¤Ä¤¤¤Æ ¿¤¯¤òÌÀ¤é¤«¤Ë¤·¤Ê¤¤¤³¤È¤ò Íý²ò¤¹¤ë¤³¤È ¤¬ÂçÀڤǤ¹. Î㤨¤Ð, Æâ¢¤Î UART ¤ò»ý¤Ä¾åµ¤ÎÆó¤Ä¤Î¥â¥Ç¥à¤ÇÊó¹ð¤µ¤ì ¤¿Áê°ãÅÀ¤ÎÌóȾʬ¤¬, 5µÚ¤Ó6¥Ó¥Ã¥È¥¥ã¥é¥¯¥¿¥â¡¼¥É¤ò¥µ¥Ý¡¼¥È¤·¤Ê¤¤¥¯ ¥í¡¼¥ó¤Î UART ¤Ë¤è¤Ã¤Æ°ú¤µ¯¤³¤µ¤ì¤Þ¤·¤¿. ËÜʪ¤Î 16550, 16450 ¤½¤· ¤Æ 8250 UART ¤¹¤Ù¤Æ¤Ï¤³¤ì¤é¤Î¥â¡¼¥É¤ò¥µ¥Ý¡¼¥È¤·, COMTEST ¤Ï¤³¤ì¤é¤Î ¥â¡¼¥É¤Îµ¡Ç½À¤ò¥Á¥§¥Ã¥¯¤¹¤ë¤Î¤Ç, 50¤ò±Û¤¨¤ëÁê°ãÅÀ¤¬Êó¹ð¤µ¤ì¤Þ¤·¤¿. ¤·¤«¤·, 5µÚ¤Ó6¥Ó¥Ã¥È¥¥ã¥é¥¯¥¿¥â¡¼¥É¤ò ¥µ¥Ý¡¼¥È¤¹¤ë¥â¥Ç¥à¤ÏËØ¤É¤Ê¤¯, ÆÃ¤Ë¤Ë¤³¤ì¤é¤Ï¥¨¥é¡¼½¤Àµ¤È°µ½Ìµ¡Ç½ÉդΤâ¤Î¤Ç¤¹. ¤³¤ì¤Ï5µÚ¤Ó6¥Ó¥Ã¥È ¥¥ã¥é¥¯¥¿¥â¡¼¥É¤Ë´ØÏ¢¤·¤¿Áê°ãÅÀ¤Ï º¹¤·°ú¤¤¤Æ¹Í¤¨¤ë¤³¤È¤¬¤Ç¤¤ë¤³¤È ¤ò°ÕÌ£¤·¤Æ¤¤¤Þ¤¹.
COMTEST ¤¬Êó¹ð¤·¤¿Áê°ãÅÀ¤Î¿¤¯¤Ï, ¥¿¥¤¥ß¥ó¥°¤Ë´Ø¤¹¤ëÅÀ¤Ç¤·¤ç¤¦. ¿¤¯¤Î¥¯¥í¡¼¥ó¤ÎÀ߷פǤÏ, ¥Û¥¹¥È¤¬°ì¤Ä¤Î¥Ý¡¼¥È¤«¤éÆÉ¤ß¹þ¤ó¤À»þ¤Ë¾ ¤Î¤¢¤ë¥Ý¡¼¥È¤Î¥¹¥Æ¡¼¥¿¥¹¥Ó¥Ã¥È¤Ï, ËÜÅö¤Î NS16550AFN ¤ÈƱ¤¸ Ťµ¤Î»þ´ÖÆâ¤Ç¹¹¿·¤µ¤ì¤Ê¤¤ (¤¢¤ë¤â¤Î¤Ï®¤¯, ¤¢¤ë¤â¤Î¤ÏÃÙ¤¯) ¤«¤â¤·¤ì ¤Þ¤»¤ó¤¬, COMTEST ¤Ï¤³¤ì¤é¤ÎÁê°ãÅÀ¤òõ¤·¤Þ¤¹. ¤³¤ì¤ÏÁê°ãÅÀ¤Î¿ô¤Ï¸í ²ò¤ò¾·¤°×¤¤¤â¤Î¤Ç¤¹. ¤¢¤ë¥Ç¥Ð¥¤¥¹¤Ë¤Ï°ì¤Ä¤«Æó¤Ä¤ÎÁê°ãÅÀ¤·¤«¤¢¤ê¤Þ ¤»¤ó¤¬¤½¤ì¤é¤ÏÈó¾ï¤Ë½ÅÂ礫¤â¤·¤ì¤Þ¤»¤ó. ¤Þ¤¿Ê̤ΥǥХ¤¥¹¤Ï´ð½àÉôÉÊ ¤ÈÈæ¤Ù¤ÆÂ®¤¯¤Þ¤¿¤ÏÃÙ¤¯ status ¥ì¥¸¥¹¥¿¤ò¹¹¿·¤¹¤ë¤¿¤á¤Ë (ŬÀڤ˽ñ¤« ¤ì¤¿¥É¥é¥¤¥Ð¤ÎÁàºî¤Ë¤Ï¤Þ¤Ã¤¿¤¯±Æ¶Á¤·¤Ê¤¤¤«¤â¤·¤ì¤Þ¤»¤ó) ¿¤¯¤ÎÁê°ãÅÀ¤ò Êó¹ð¤µ¤ì¤ë¤«¤â¤·¤ì¤Þ¤»¤ó.
COMTEST ¤ÏÌäÂê¤ò°ú¤µ¯¤³¤¹¤«¤âÃΤì¤Ê¤¤, ¤Þ¤¿¤ÏÆÃ¼ì¤Ê¥±¡¼¥¹¤È¤·¤Æ½è Íý¤·¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤ÀøºßŪ¤ËÌ·½â¤·¤¿ÉôÉʤθºß¤ËÂФ·¤Æ, ´ÉÍý¼Ô¤Ë·Ù ¹ð¤ò½Ð¤¹¥¹¥¯¥ê¡¼¥Ë¥ó¥°¥Ä¡¼¥ë¤È¤·¤Æ»ÈÍѤǤ¤Þ¤¹.
¤â¤·¥â¥Ç¥à¤ÎÃæ¤Ë¤¢¤ë 16550 ¤ä¥·¥ê¥¢¥ë¥Ý¡¼¥ÈÀܳ¤µ¤ì¤Æ¤¤¤ë¥â¥Ç¥à¤Ë ÂФ·¤Æ COMTEST ¤ò¼Â¹Ô¤¹¤ë¾ì¹ç, ¥â¥Ç¥à¤¬¥Æ¥¹¥È¥¥ã¥é¥¯¥¿¤ò¥¨¥³¡¼¤· ¤Ê¤¤¤è¤¦¤ËºÇ½é¤Ë ATE0&W ¥³¥Þ¥ó¥É¤ò¥â¥Ç¥à¤Ëȯ¹Ô¤¹¤ëɬÍפ¬¤¢¤ê¤Þ ¤¹. ¤³¤ì¤ò¤ª¤³¤Ê¤¦¤³¤È¤ò˺¤ì¤¿¾ì¹ç, COMTEST ¤Ï¾¯¤Ê¤¯¤È¤â¤³¤ÎÁê°ãÅÀ¤ò Êó¹ð¤¹¤ë¤Ç¤·¤ç¤¦:
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8250/16450/16550 UART ¤ÏȬ¤Ä¤ÎϢ³¤¹¤ë I/O ¥Ý¡¼¥È¥¢¥É¥ì¥¹¤òͽÌó ¤·¤Æ¤¤¤Þ¤¹. IBM PC ¤Ç¤Ï¤³¤ì¤é¤ÎȬ¤Ä¤Î¥Ý¡¼¥È¤ËÂФ·¤ÆÆó¤Ä¤ÎÄêµÁ¤µ¤ì¤¿ °ÌÃÖ¤¬¤¢¤ê, ¤½¤ì¤é¤Ï½¸¹çŪ¤Ë COM1 ¤È COM2 ¤È¤·¤ÆÃΤé¤ì¤Æ¤¤¤Þ¤¹. PC ¥¯¥í¡¼¥ó¤È¥¢¥É¥ª¥ó¥«¡¼¥É¤Î¥á¡¼¥«¡¼¤Ï COM3 ¤È COM4 ¤È¤·¤ÆÃΤé¤ì¤ëÆó¤Ä ¤ÎÉÕ²ÃŪ¤ÊÎΰè¤òºîÀ®¤·¤Þ¤·¤¿¤¬, ´ö¤Ä¤«¤Î¥·¥¹¥Æ¥à¤Ç¤Ï¤³¤ì¤é¤Î;ʬ¤Ê COM ¥Ý¡¼¥È¤Ï¾¤Î¥Ï¡¼¥É¥¦¥§¥¢¤È¾×ÆÍ¤·¤Þ¤¹. ºÇ¤â¤è¤¯µ¯¤¤ë¤â¤Î¤Ï IBM 8514 ¥¨¥ß¥å¥ì¡¼¥·¥ç¥ó¤òÄ󶡤¹¤ë¥Ó¥Ç¥ª¥¢¥À¥×¥¿¤È¤Î¾×ÆÍ¤Ç¤¹.
COM1 ¤Ë¤Ï 0x3f8 ¤«¤é 0x3ff ¤¬³ä¤êÅö¤Æ¤é¤ì, Ä̾ï IRQ 4 ¤¬»ÈÍѤµ¤ì¤Þ¤¹. COM2 ¤Ë¤Ï 0x2f8 ¤«¤é 0x2ff ¤¬³ä¤êÅö¤Æ¤é¤ì, Ä̾ï IRQ 3 ¤¬»ÈÍѤµ¤ì¤Þ¤¹. COM3 ¤Ë¤Ï 0x3e8 ¤«¤é 0x3ef ¤¬³ä¤êÅö¤Æ¤é¤ì, IRQ ¤Ïɸ½à²½¤µ¤ì¤Æ¤¤¤Þ¤»¤ó. COM4 ¤Ë¤Ï 0x2e8 ¤«¤é 0x2ef ¤¬³ä¤êÅö¤Æ¤é¤ì, IRQ ¤Ïɸ½à²½¤µ¤ì¤Æ¤¤¤Þ¤»¤ó.
8250/16450/16550 UART ¤ÎI/O¥Ý¡¼¥È¤Î¾ÜºÙ¤Ï°Ê²¼¤ËÄ󶡤µ¤ì¤Æ¤¤¤Þ¤¹.
I/O ¥Ý¡¼¥È | µö²Ä¤µ¤ì¤¿¥¢¥¯¥»¥¹ | ÀâÌÀ | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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+0x00 | write (DLAB==0) |
Transmit Holding Register (THR). ¤³¤Î¥Ý¡¼¥È¤Ë½ñ¤¹þ¤Þ¤ì¤¿¾ðÊó¤Ï ¥Ç¡¼¥¿Ì¿Îá¤È¤·¤Æ ½èÍý¤µ¤ì, UART ¤Ë¤è¤êÁ÷¿®¤µ¤ì¤Þ¤¹. |
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+0x00 | read (DLAB==0) |
Receive Buffer Register (RBR). ¥·¥ê¥¢¥ëÀܳ¤«¤é UART ¤Ë¤è¤Ã¤Æ¼õ¿®¤µ¤ì¤¿¤¹¤Ù¤Æ¤Î ¥Ç¡¼¥¿Ì¿Îá¤Ï, ¤³¤Î¥Ý¡¼¥È¤òÆÉ¤à¤³¤È¤Ë¤è¤Ã¤Æ¥Û¥¹ ¥È¤Ë¤è¤ê¥¢¥¯¥»¥¹¤µ¤ì¤Þ¤¹. |
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+0x00 | write/read (DLAB==1) |
Divisor Latch LSB (DLL) ¥Þ¥¹¥¿ÆþÎÏ¥¯¥í¥Ã¥¯¤Î¼þÇÈ¿ô¤ò ¤³¤Î¥ì¥¸¥¹¥¿¤ËÆþ¤Ã ¤Æ¤¤¤ëÃͤdzä¤ë¤³¤È¤Ë¤è¤ê, UART ¤Î¼þÇÈ¿ô¤¬·èÄê ¤µ¤ì¤Þ¤¹ (IBM PC¤Ç¤Ï, ¥Þ¥¹¥¿¥¯¥í¥Ã¥¯¤Î¼þÇÈ¿ô¤Ï 1.8432MHz¤Ç¤¹). ¤³¤Î¥ì¥¸¥¹¥¿¤Ë¤Ï¾åµ¤Î½ü¿ô¤Î²¼ °Ì8¥Ó¥Ã¥È¤¬Æþ¤Ã¤Æ¤¤¤Þ¤¹. |
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+0x01 | write/read (DLAB==1) |
Divisor Latch MSB (DLH) ¥Þ¥¹¥¿ÆþÎÏ¥¯¥í¥Ã¥¯¤Î¼þÇÈ¿ô¤ò¤³¤Î ¥ì¥¸¥¹¥¿¤ËÆþ¤Ã ¤Æ¤¤¤ëÃͤdzä¤ë¤³¤È¤Ë¤è¤ê, UART ¤Î¼þÇÈ¿ô¤¬·èÄê ¤µ¤ì¤Þ¤¹ (IBM PC¤Ç¤Ï, ¥Þ¥¹¥¿¥¯¥í¥Ã¥¯¤Î¼þÇÈ¿ô¤Ï 1.8432MHz¤Ç¤¹). ¤³¤Î¥ì¥¸¥¹¥¿¤Ë¤Ï¾åµ¤Î½ü¿ô¤Î¾å °Ì8¥Ó¥Ã¥È¤¬Æþ¤Ã¤Æ¤¤¤Þ¤¹. |
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+0x01 | write/read (DLAB==0) |
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+0x02 | write |
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+0x02 | read |
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+0x03 | write/read |
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+0x04 | write/read |
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+0x05 | write/read |
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+0x06 | write/read |
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+0x07 | write/read | Scratch Register (SCR). ¤³¤Î¥ì¥¸¥¹¥¿¤Ï UART ¤Ç¤Ïµ¡Ç½¤·¤Þ¤»¤ó. ¤³¤Î¾ì½ê ¤Ë¤Ï ¤É¤ó¤ÊÃͤǤâ¥Û¥¹¥È¤Ë¤è¤Ã¤Æ½ñ¤¹þ¤Þ¤ì¤ë¤³ ¤È¤¬¤Ç¤, ¤½¤Î¸å¥Û¥¹¥È¤Ë¤è¤Ã¤ÆÆÉ¤ß¹þ¤à¤³¤È¤¬²Ä ǽ¤Ç¤¹. |
¥Ê¥·¥ç¥Ê¥ë¡¦¥»¥ß¥³¥ó¥À¥¯¥¿¤ÏÉÕ²ÃŪ¤Êµ¡Ç½¤ò»ý¤Ä 16550 ¤È¸ß´¹ À¤Î¤¢¤ëÉôÉʤòÄ󶡤·¤Æ¤¤¤Þ¤»¤ó¤¬, ¿§¡¹¤Ê¾¤Î¥Ù¥ó¥À¤¬¤½¤ì¤ò»ý¤Ã ¤Æ¤¤¤Þ¤¹. ¤³¤ì¤é¤ÎÉôÉʤδö¤Ä¤«¤Ï°Ê²¼¤Ëµ½Ò¤µ¤ì¤Æ¤¤¤Þ¤¹. ¸ú²ÌŪ ¤Ë¤³¤ì¤é¤Î²þÎɤò»ÈÍѤ¹¤ë¤¿¤á¤Ë¤Ï, ËØ¤É¤Î¥Ý¥Ô¥å¥é¡¼¤Ê¥ª¥Ú¥ì¡¼¥Æ¥£ ¥ó¥°¥·¥¹¥Æ¥à¤¬ 16550 ¤¬Ä󶡤¹¤ëµ¡Ç½°Ê¾å¤Î¤â¤Î¤ò¥µ¥Ý¡¼¥È¤·¤Ê¤¤ ¤¿¤á, ¥É¥é¥¤¥Ð¤Ï¥Á¥Ã¥×¥Ù¥ó¥À¤«¤éÄ󶡤µ¤ì¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¤³¤È¤ò Íý²ò¤·¤Æ¤ª¤¯É¬Íפ¬¤¢¤ê¤Þ¤¹.
¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¤³¤ÎÉôÉÊ¤Ï NS16550A ¤È»÷¤Æ¤¤¤Þ¤¹¤¬, ³È Ä¥¤µ¤ì¤¿32¥Ð¥¤¥È¤ÎÁ÷¼õ¿®¥Ð¥Ã¥Õ¥¡¤ò ¥ª¥×¥·¥ç¥ó¤Ç͸ú¤Ë¤Ç ¤¤Þ¤¹. Startech ¤Ë¤è¤êÀ½Â¤¤µ¤ì¤Þ¤·¤¿.
¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¤³¤ÎÉôÉÊ¤Ï NS16550A ¤ÈÎà»÷¤·¤¿¿¶Éñ¤¤¤ò ¤·¤Þ¤¹¤¬, ³ÈÄ¥¤µ¤ì¤¿64¥Ð¥¤¥È¤ÎÁ÷¼õ¿®¥Ð¥Ã¥Õ¥¡¤ò¥ª¥×¥·¥ç ¥ó¤Ç͸ú¤Ë¤Ç¤¤Þ¤¹. Texas Instruments ¤Ë¤è¤êÀ½Â¤¤µ¤ì¤Þ ¤·¤¿.
¤³¤ÎÀìÇäÆÃµö¤Î¥×¥é¥°¥¤¥ó¥«¡¼¥É¤Ï, 2048¥Ð¥¤¥È¤ÎÁ÷¼õ ¿®¥Ð¥Ã¥Õ¥¡¤ò´Þ¤ß, 230.4Kbit/sec ¤Î¥Ç¡¼¥¿¥ì¡¼¥È¤ò¥µ¥Ý¡¼ ¥È¤·¤Þ¤¹. Hayes ¤Ë¤è¤êÀ½Â¤¤µ¤ì¤Þ¤·¤¿.
¤³¤ì¤é¤Î``¥À¥à''UART ¤Ë²Ã¤¨, ¤¿¤¯¤µ¤ó¤Î¥Ù¥ó¥À¤¬¥¤¥ó¥Æ¥ê¥¸¥§ ¥ó¥È¥·¥ê¥¢¥ë¥³¥ß¥Ë¥å¥±¡¼¥·¥ç¥ó¥Ü¡¼¥É¤òÀ½Â¤¤·¤Æ¤¤¤Þ¤¹. ¤³ ¤Î¥¿¥¤¥×¤ÎÀ߷פÏÄ̾ï¥Þ¥¤¥¯¥í¥×¥í¥»¥Ã¥µ¤òÄ󶡤·¤Æ¤ª¤ê, ¤³¤Î¥Þ¥¤ ¥¯¥í¥×¥í¥»¥Ã¥µ¤Ï´ö¤Ä¤«¤Î UART ¤Ø¤Î¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤È¤Ê¤Ã¤Æ¥Ç¡¼¥¿ ¤ò½èÍý / ¥Ð¥Ã¥Õ¥¡¥ê¥ó¥°¤·, ¤½¤·¤ÆÉ¬Íפʻþ¤Ë¥á¥¤¥ó¤Î PC ¤Î¥×¥í¥»¥Ã ¥µ¤Ø·Ù¹ð¤ò½Ð¤·¤Þ¤¹. UART ¤Ï¤³¤Î¥¿¥¤¥×¤Î¥³¥ß¥Ë¥å¥±¡¼¥·¥ç¥ó¥· ¥¹¥Æ¥à¤Ë¤ª¤¤¤Æ PC ¤Î¥×¥í¥»¥Ã¥µ¤Ë¤è¤Ã¤ÆÄ¾ÀÜ¥¢¥¯¥»¥¹¤µ¤ì¤Ê¤¤¤¿¤á, ¥Ù¥ó¥À¤Ë¤È¤Ã¤Æ¤Ï 8250, 16450, ¤Þ¤¿¤Ï 16550 UART ¤È¸ß´¹À¤Î¤¢¤ë UART ¤ò»ÈÍѤ¹¤ëɬÍפϤ¢¤ê¤Þ¤»¤ó. ¤³¤ì¤Ë¤è¤êÀß·×¼Ô¤Ï, ¤è¤êÎɤ¤ ÀǽÆÃÀ¤ò»ý¤ÄÉôÉʤ¬¼«Í³¤ËÍøÍѤǤ¤Þ¤¹.
sio ¥É¥é¥¤¥Ð¤Ï, NS8250-, NS16450-, NS16550¤ÈNS16550A ¥Ù¡¼¥¹¤Î EIA RS-232C(CCITT V.24) ÄÌ¿®ÍÑ¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤ò¥µ¥Ý¡¼¥È¤·¤Þ¤¹. ¤Þ ¤¿, ¤¤¤¯¤Ä¤«¤Î¥Þ¥ë¥Á¥Ý¡¼¥È¥·¥ê¥¢¥ë¥«¡¼¥É¤â¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤Þ¤¹. µ»½ÑŪ ¤Ê¾ÜºÙ¤Ë¤Ä¤¤¤Æ¤Ï¥Þ¥Ë¥å¥¢¥ë sio(4) ¤ò¸«¤Æ¤¯¤À¤µ¤¤.
¸¶ºî: Andrew Webster <awebster@pubnix.net>. 1995ǯ8·î26Æü.
Ìõ: ¶ûÅÄ ¾»´õ <masaki@po.iijnet.or.jp>.6 September 1996.
°Ê²¼¤ËDigi International PC/8D¤È16550¥Á¥Ã¥×¤òưºî¤µ¤»¤ë¤¿¤á¤Î, ¥«¡¼¥Í ¥ëconfig¤ÎÉôʬ¤ò¼¨¤·¤Þ¤¹. ¤³¤Î¥Ü¡¼¥É¤Ï, 8ËܤβóÀþ¤Ë¤¹¤Ù¤Æ¥â¥Ç¥à¤òÀܳ ¤·¤¿¾ì¹ç¤Ç¤âÎɹ¥¤Ëưºî¤·¤Þ¤¹.
options COM_MULTIPORT ¤ò²Ã¤¨¤ë¤Î¤ò˺¤ì¤Ê¤¤¤Ç¤¯¤À¤µ¤¤. ˺¤ì¤ë ¤È¤¦¤Þ¤¯Æ°ºî¤·¤Þ¤»¤ó!
device sio4 at isa? port 0x100 tty flags 0xb05 device sio5 at isa? port 0x108 tty flags 0xb05 device sio6 at isa? port 0x110 tty flags 0xb05 device sio7 at isa? port 0x118 tty flags 0xb05 device sio8 at isa? port 0x120 tty flags 0xb05 device sio9 at isa? port 0x128 tty flags 0xb05 device sio10 at isa? port 0x130 tty flags 0xb05 device sio11 at isa? port 0x138 tty flags 0xb05 irq 9 vector siointr
¤³¤³¤Ç³Æ SIO ¥Ý¡¼¥È¤¬³ä¤ê¹þ¤ß¤ò¶¦Í¤¹¤ë°ì¤Ä¤Î¥°¥ë¡¼¥×¤Ç¤¢¤ë¤³¤È¤òɽ¸½ ¤¹¤ë¤¿¤á¤Ë, ¥È¥ê¥Ã¥¡¼¤ÊÀßÄê¤ò¤·¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó. ¥Õ¥é¥° (flags ¤Î¸å ¤í¤Î 16 ¿Ê¿ô) ¤Î²¼¤«¤é 2 ¥Ð¥¤¥ÈÌܤˤ³¤Î¥°¥ë¡¼¥×¤ÎºÇ¸å¤Î SIO ¥Ý¡¼¥È¤ÎÈÖ ¹æ¤òÀßÄꤷ¤Þ¤¹. ¤³¤ÎÎã¤Ç¤Ï 11 (16¿Ê¿ô¤Ç¤Ï 0x0b) ¤Ç¤¹¤«¤é, ³Æ¥Ç¥Ð¥¤¥¹¤Î ¥Õ¥é¥°¤Ï 0xb05 ¤È¤Ê¤ê¤Þ¤¹.
´ó£ Don Whiteside <whiteside@acm.org>. 1995ǯ8·î26Æü
FreeBSD ¤Ç Boca 16pord ¤Î¥Ü¡¼¥É¤òư¤«¤¹¤³¤È¤Ï´Êñ¤Ç¤¹¤¬, ¤½¤Î¤¿ ¤á¤Ë¤Ï¤¤¤¯¤Ä¤«¤Îºî¶È¤¬É¬ÍפǤ¹. :
2.0.5 ¤Î¥Ç¥Õ¥©¥ë¥È¤Î¥«¡¼¥Í¥ë¤Ï, ¥Þ¥ë¥Á¥Ý¡¼¥È¤Î¥µ¥Ý¡¼¥È¤ò¤·¤Æ ¤¤¤Ê¤¤ ¤Î¤Ç, ¤¢¤Ê¤¿¤Ï³Æ¥Ý¡¼¥ÈËè¤Ë¥Ç¥Ð¥¤¥¹¥¨¥ó¥È¥ê¤òÄɲ乤ëɬÍפ¬ ¤¢¤ê¤Þ¤¹. ¤Ä¤Þ¤êɬÍפʥª¥×¥·¥ç¥ó¤òÉÕ¤±¤Æ, ¥«¡¼¥Í¥ë¤ÎºÆ¹½ÃÛ¤ò¤·¤Ê¤±¤ì¤Ð ¤Ê¤ê¤Þ¤»¤ó. ¤½¤Î¤¿¤á¤Ë¤Ï, ¤¢¤Ê¤¿¤Î¥Þ¥·¥ó¤Ë¥«¡¼¥Í¥ë¤Î¥½¡¼¥¹¥³¡¼¥É¤¬´û¤Ë ¥¤¥ó¥¹¥È¡¼¥ë¤µ¤ì¤Æ¤¤¤ë¤«, ¤¢¤Ê¤¿¤ÎÂØ¤ï¤ê¤Î狼¤Ë¥«¡¼¥Í¥ëºÆ¹½ÃÛ¤ò¤ä¤Ã¤Æ ¤â¤é¤¦É¬Íפ¬¤¢¤ê¤Þ¤¹.
2ÈÖÌܤË, ¤¢¤Ê¤¿¤Ï¥«¡¼¥Í¥ë¥ª¥×¥·¥ç¥ó¤òÀµ¤·¤¯ÀßÄꤹ¤ë¤¿¤á¤Ë, ¤¢¤Ê ¤¿¤ÎBoca Board¤Î IO ¤È³ä¤ê¹þ¤ß¤ÎÃͤòÃΤäƤ¤¤ëɬÍפ¬¤¢¤ê¤Þ¤¹.
¤Ò¤È¤Ä½ÅÍפʤ³¤È¤¬¤¢¤ê¤Þ¤¹. Boca 16 ¤Ë»È¤ï¤ì¤Æ¤¤¤ë¼ÂºÝ¤Î UART ¥Á¥Ã¥× ¤Ï, Boca 16 ¤Î¥Ü¡¼¥É¤Ç¤Ï¤Ê¤¯, ³°ÉÕ¤±¤Î¥³¥Í¥¯¥¿¥Ü¥Ã¥¯¥¹¤ÎÃæ¤Ë¸ºß¤·¤Þ¤¹. ¥³¥Í¥¯¥¿¥Ü¥Ã¥¯¥¹¤òÀܳ¤·¤Ê¤¤¤È, ¥Ý¡¼¥È¤Î¸¡½Ð¤Ë¼ºÇÔ¤¹¤ë¤Ç¤·¤ç¤¦. »ä¤Ï, Àܳ¤·¤Ê¤¤¤Þ¤Þµ¯Æ°¤·¤¿¤ê, ¸å¤«¤éÀܳ¤·¤Ê¤ª¤·¤¿¤ê¤·¤¿»þ¤Ë¤É¤¦¤Ê¤ë¤«¤ò¥Æ ¥¹¥È¤·¤Æ¤¤¤Þ¤»¤ó. ¤É¤Á¤é¤â¼Â¹Ô¤·¤Ê¤¤¤è¤¦¤ª¾©¤á¤·¤Þ¤¹.
¤â¤·¤¢¤Ê¤¿¤¬¥«¥¹¥¿¥Þ¥¤¥ººÑ¤ß¤Î¥«¡¼¥Í¥ë ¥³¥ó¥Õ¥£¥°¥ì¡¼¥·¥ç¥ó¥Õ¥¡¥¤¥ë¤ò»ý¤Ã ¤Æ¤¤¤Ê¤±¤ì¤Ð, °ìÈÌŪ¤Ê»öÊÁ¤Ë¤Ä¤¤¤Æ¤Ï, FreeBSD ¥«¡¼¥Í¥ë¤Î¥³¥ó¥Õ¥£¥°¥ì¡¼¥·¥ç¥ó ¤ò»²¹Í¤Ë¤·¤Æ¤¯¤À¤µ¤¤. °Ê²¼¤ËBoca 16¤Î¥Ü¡¼¥É ¤Ë´Ø·¸¤¹¤ëÉôʬ¤À¤±¤òµ½Ò¤·¤Þ¤¹. ¤³¤ÎÎã¤Ç¤Ï, ¤¢¤Ê¤¿¤¬MYKERNEL¤È¤¤¤¦Ì¾Á° ¤Î¥«¡¼¥Í¥ë¤ò»È¤Ã¤Æ¤¤¤Æ, ¥¨¥Ç¥£¥¿¤Ë¤Ï vi¤ò»È¤Ã¤Æ¤¤¤ë¤³¤È¤ò²¾Äꤷ¤Æ¤¤¤Þ ¤¹.
¼¡¤Î1¹Ô¤òconfig¥Õ¥¡¥¤¥ë¤ËÄɲ䷤Ƥ¯¤À¤µ¤¤.
options COM_MULTIPORT
¤³¤Î device sion¤È¤¤¤¦¹Ô¤ò, ɬÍפ˱þ¤¸¤Æ 16 ¸Ä¤Î¥Ç¥Ð¥¤¥¹Ê¬¤òÄɲ䷤Ƥ¯¤À¤µ¤¤. ºÇ¸å¤Î¥Ç¥Ð¥¤¥¹¤Ë¤À¤±, ¤³¤Î¥Ü¡¼¥É ¤Î³ä¤ê¹þ¤ß¥Ù¥¯¥¿¤òµ½Ò¤·¤Þ¤¹. (¾ÜºÙ¤Ï sio(4) ¤Î¥Þ¥Ë¥å¥¢ ¥ë¥Ú¡¼¥¸¤ò»²¾È¤·¤Æ¤¯¤À¤µ¤¤.) °Ê²¼¤ÎÎã¤Ï, ³ä¤ê¹þ¤ß 3, ¥Ù¡¼¥¹ IO ¥¢¥É¥ì¥¹ 100h ¤ÎÃͤò»ý¤Ä Boca Board ¤Î¾ì¹ç¤Ç¤¹. ³Æ¥Ý¡¼¥È¤Î¤¿¤á¤Î IO ¥¢¥É¥ì¥¹¤Ï, 100h, 108h, 110h, ... ¤Î¤è ¤¦¤Ë 16 ¿ÊË¡¤Ç 8 ¤Å¤Ä²Ã¤¨¤Æ¤¤¤¤Þ¤¹.
device sio1 at isa? port 0x100 tty flags 0x1005 device sio2 at isa? port 0x108 tty flags 0x1005 device sio3 at isa? port 0x110 tty flags 0x1005 device sio4 at isa? port 0x118 tty flags 0x1005 ... device sio15 at isa? port 0x170 tty flags 0x1005 device sio16 at isa? port 0x178 tty flags 0x1005 irq 3 vector siointr
¥Õ¥é¥°¥¨¥ó¥È¥ê¤Ï, ¤¢¤Ê¤¿¤¬Á´¤¯Æ±¤¸sio¤Î³ä¤êÅö¤Æ¤ò»È¤Ã¤Æ¤¤¤Ê¤¤¸Â¤ê ɬ¤º ¾åµ¤ÎÎ㤫¤éÊѹ¹¤·¤Æ¤¯¤À¤µ¤¤. ¥Õ¥é¥°¤Ï, ¼¡¤Î¤è¤¦¤ËÀßÄꤷ¤Þ¤¹. 0x M YY ¤ÎM¤Ï, ¥Þ¥¹¥¿¥Ý¡¼¥È (Boca 16¤ËÅëºÜ¤µ¤ì¤¿ºÇ¸å ¤Î¥Ý¡¼¥È)¤Î¥Þ¥¤¥Ê¡¼ÈÖ¹æ¤ò»ØÄꤷ¤Þ¤¹. ¤µ¤é¤Ë YY ¤ÎÉôʬ¤ÏFIFO¤¬ ͸ú¤Þ¤¿¤Ï̵¸ú¤Ç¤¢¤ë¤³¤È (¤³¤Î¾ì¹ç¤Ï͸ú), ³ä¤ê¹þ¤ß¤ò (¥Ü¡¼¥ÉÆâ¤Ç) ¶¦ ͤ·¤Æ¤¤¤ë¤« (¤³¤Î¾ì¹ç¤ÏYES), ¤½¤·¤Æ, AST/4 ¤È¸ß´¹À¤Î¤¢¤ë»ý¤Ä³ä¤ê¹þ¤ß À©¸æ¥ì¥¸¥¹¥¿¤ò»ý¤Ã¤Æ¤¤¤ë¤« (¤³¤Î¾ì¹ç¤ÏNO) ¤ò»ØÄꤷ¤Þ¤¹. ¤³¤ÎÎã¤Ç¤Ï,
flags 0x1005
¤È¤¤¤¦¥Õ¥é¥°¤Ë¤è¤Ã¤Æ, ¥Þ¥¹¥¿¥Ý¡¼¥È¤¬ sio16 ¤Ç¤¢¤ë¤³¤È¤ò¼¨¤·¤Þ¤¹. ¤â ¤·Æ±¤¸¥Ü¡¼¥É¤ò¤â¤¦°ìËçÄɲä·, sio17 ¤«¤é sio28 ¤ò³ä¤êÅö¤Æ¤ë¤Ê¤é, ¿·¤·¤¤Êý¤Î ¥Ü¡¼¥É¤ËÂбþ¤¹¤ë 16 ¸Ä¤Î¥Ý¡¼¥È¤Î¥Õ¥é¥°¤Ï¤¹¤Ù¤Æ 0x1C05 ¤Ë ¤Ê¤ê¤Þ¤¹. 28 (== 0x1C) ¤Ï¿·¤·¤¤¥Ü¡¼¥É¤Î¥Þ¥¹¥¿¥Ý¡¼¥È¤Î¥Þ¥¤¥Ê¡¼ÈÖ¹æ¤Ç ¤¹. ¥Õ¥é¥°¤Î 05 ¤ÎÉôʬ¤ÏÊѹ¹¤·¤Ê¤¤¤Ç¤¯¤À¤µ¤¤.
¥«¡¼¥Í¥ë¥³¥ó¥Õ¥£¥°¥ì¡¼¥·¥ç¥ó¥Õ¥¡¥¤¥ë¤ò Êݸ¤·¤Æ¥«¡¼¥Í¥ë¤ÎÀßÄê¤ò´°Î»¤·¤Þ ¤¹. ¥«¡¼¥Í¥ë¤ò¥³¥ó¥Ñ¥¤¥ë¸å, ¥¤¥ó¥¹¥È¡¼¥ë¤·, ¿·¤·¤¤¥«¡¼¥Í¥ë¤Ç¥ê¥Ö¡¼¥È¤· ¤Æ¤¯¤À¤µ¤¤. ºÆ¥³¥ó¥Ñ¥¤¥ë¤µ¤ì¤¿¥«¡¼¥Í¥ë¤¬¤¦¤Þ¤¯¥¤¥ó¥¹¥È¡¼¥ë¤µ¤ì¤Æ, ¤½¤Î¥«¡¼¥Í¥ë¤ËÀµ ¤·¤¤¥¢¥É¥ì¥¹¤È³ä¤ê¹þ¤ß¤¬ÀßÄꤵ¤ì¤Æ¤¤¤¿¤Ê¤é¤Ð, ¥Ö¡¼¥È¥á¥Ã¥»¡¼¥¸¤Ï¼¡¤Î ¤è¤¦¤Ë Boca ¥Ý¡¼¥È¤Î¸¡½Ð¤ËÀ®¸ù¤¹¤ë¤Ï¤º¤Ç¤¹: (sio¤ÎÈÖ¹æ, IO¤ÈIRQ¤ÎÃͤÏ, ¤³¤ÎÎã¤È¤Ï°Û¤Ê¤Ã¤Æ¤¤¤ë¤Ç¤·¤ç¤¦)
sio1 at 0x100-0x107 flags 0x1005 on isa sio1: type 16550A (multiport) sio2 at 0x108-0x10f flags 0x1005 on isa sio2: type 16550A (multiport) sio3 at 0x110-0x117 flags 0x1005 on isa sio3: type 16550A (multiport) sio4 at 0x118-0x11f flags 0x1005 on isa sio4: type 16550A (multiport) sio5 at 0x120-0x127 flags 0x1005 on isa sio5: type 16550A (multiport) sio6 at 0x128-0x12f flags 0x1005 on isa sio6: type 16550A (multiport) sio7 at 0x130-0x137 flags 0x1005 on isa sio7: type 16550A (multiport) sio8 at 0x138-0x13f flags 0x1005 on isa sio8: type 16550A (multiport) sio9 at 0x140-0x147 flags 0x1005 on isa sio9: type 16550A (multiport) sio10 at 0x148-0x14f flags 0x1005 on isa sio10: type 16550A (multiport) sio11 at 0x150-0x157 flags 0x1005 on isa sio11: type 16550A (multiport) sio12 at 0x158-0x15f flags 0x1005 on isa sio12: type 16550A (multiport) sio13 at 0x160-0x167 flags 0x1005 on isa sio13: type 16550A (multiport) sio14 at 0x168-0x16f flags 0x1005 on isa sio14: type 16550A (multiport) sio15 at 0x170-0x177 flags 0x1005 on isa sio15: type 16550A (multiport) sio16 at 0x178-0x17f irq 3 flags 0x1005 on isa sio16: type 16550A (multiport master)
¤â¤·¥á¥Ã¥»¡¼¥¸¤Îɽ¼¨¤¬Â®¤¯¤ÆÆÉ¤ß¼è¤ì¤Ê¤¤¤È¤¤Ï,
# dmesg | more¤È¤¹¤ë¤È¥Ö¡¼¥È»þ¤Î¥á¥Ã¥»¡¼¥¸¤ò ¤æ¤Ã¤¯¤ê¸«¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹.
¼¡¤Ë, root ¤Ë¤Ê¤Ã¤Æ¤«¤é, ¥Ç¥Ð¥¤¥¹¤Ë¤¢¤ï¤»¤¿¥¨¥ó¥È¥ê¤ò /dev/MAKEDEV ¥¹¥¯¥ê¥×¥È¤ò»È¤Ã¤Æ/dev ¤ËÄɲä·¤Þ¤¹.
# cd /dev # ./MAKEDEV tty1 # ./MAKEDEV cua1 (ÃæÎ¬) # ./MAKEDEV ttyg # ./MAKEDEV cuag
¤â¤·, ²¿¤é¤«¤ÎÍýͳ¤Çȯ¿®¤¹¤ë¥Ç¥Ð¥¤¥¹¤¬ÉÔÍפʾì¹ç, cua* ¥Ç¥Ð ¥¤¥¹¤òºî¤é¤Ê¤¤¤ÇºÑ¤Þ¤¹¤³¤È¤â¤Ç¤¤Þ¤¹.
¥Ç¥Ð¥¤¥¹¤¬³Î¼Â¤Ëưºî¤·¤Æ¤¤¤ë¤«¤É¤¦¤« ³Îǧ¤¹¤ë¼ê¤Ã¼è¤êÁᤤÊýË¡¤Ï, ¤¢¤Ê¤¿¤¬ (root¤Ë¤Ê¤Ã¤Æ) ³Æ¥Ý¡¼¥È¤Ë¥â¥Ç¥à¤òÀܳ¤·¤Æ¤ß¤Æ, ¤¢¤Ê¤¿¤¬ºîÀ®¤· ¤¿³Æ¥Ç¥Ð¥¤¥¹Ëè¤Ë
# echo at> ttyd*
¤È¤ä¤Ã¤Æ¤ß¤Æ¤¯¤À¤µ¤¤. ³Æ¥Ý¡¼ ¥È¤¬Æ°ºî¤·¤Æ¤¤¤ì¤Ð RX¤Îɽ¼¨¤¬¸÷¤ë¤Î¤¬¸«¤¨¤ë¤Ï¤º ¤Ç¤¹.
¸¶ºî: Alex Nash <alex@freebsd.org>. 6 June 1996.
Ìõ: Á°ÅÄ ¹¬ÈÏ <yuki@jp.FreeBSD.org>. 6 September 1996.
Cyclades ¼Ò¤Î¥Þ¥ë¥Á¥Ý¡¼¥È¥«¡¼¥É¤Ï, ¾¤Î¥Þ¥ë¥Á¥Ý¡¼¥È¥«¡¼¥É¤¬ »È¤¦ sio ¤ÎÂå¤ï¤ê¤Ë cy¥É¥é¥¤¥Ð¤ò»È¤¤¤Þ¤¹. ¥³¥ó¥Õ¥£¥°¥ì¡¼¥·¥ç¥ó¤ÏÈó¾ï¤Ë´Êñ¤Ç,
cy ¥Ç¥Ð¥¤¥¹¤ò¤¢¤Ê¤¿¤Î ¥«¡¼¥Í¥ë¤Î ¥³¥ó¥Õ¥£¥°¥ì¡¼¥·¥ç¥ó¤Ë¤·¤Þ¤¹. (Ãí°Õ. ¤¢¤Ê¤¿¤Îirq¤äiomem¤ÎÀßÄ꤬°ã¤Ã¤Æ¤¤¤ë¤«¤â¤·¤ì¤Þ¤»¤ó)
device cy0 at isa? tty irq 10 iomem 0xd4000 iosiz 0x2000 vector cyintr
¿·¤·¤¤¥«¡¼¥Í¥ë¤Î ºÆ¹½À®¤È ¥¤¥ó¥¹¥È¡¼¥ë ¤ò¤·¤Þ¤¹.
¥Ç¥Ð¥¤¥¹¥Î¡¼¥É ¤ò¼¡(8¥Ý¡¼¥È¤È²¾Äꤷ¤Æ¤¤¤Þ¤¹.) ¤Î¤è¤¦¤ËÂǤäƺî¤ê¤Þ¤¹:
# cd /dev # for i in 0 1 2 3 4 5 6 7;do ./MAKEDEV cuac$i ttyc$i;done
¤â¤·, ɬÍ×¤Ê¤é ¥·¥ê¥¢¥ë¥Ç¥Ð¥¤¥¹ (ttyd) ¤È¤½¤Ã¤¯¤ê¤Ë¥³¥Ô¡¼¤·¤Æ dialup¥¨¥ó¥È¥ê¤òºî¤ê, ttyd¤ÎÂå¤ï¤ê¤Ë ttyc¤ò»È¤¤¤Þ¤¹. Îã:
ttyc0 "/usr/libexec/getty std.38400" unknown on insecure ttyc1 "/usr/libexec/getty std.38400" unknown on insecure ttyc2 "/usr/libexec/getty std.38400" unknown on insecure ... ttyc7 "/usr/libexec/getty std.38400" unknown on insecure
¿·¤·¤¤¥«¡¼¥Í¥ë¤ÇΩ¤Á¾å¤²¤Þ¤¹.