{"id":475915,"date":"2023-08-09T07:24:43","date_gmt":"2023-08-09T07:24:43","guid":{"rendered":""},"modified":"2023-09-05T11:11:34","modified_gmt":"2023-09-05T11:11:34","slug":"ascii","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/ascii\/","title":{"rendered":"ASCII"},"content":{"rendered":"<p>ASCII, t\u1eeb vi\u1ebft t\u1eaft c\u1ee7a American Standard Code for Information Interchange, l\u00e0 m\u1ed9t ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a k\u00fd t\u1ef1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong khoa h\u1ecdc m\u00e1y t\u00ednh v\u00e0 truy\u1ec1n th\u00f4ng \u0111i\u1ec7n t\u1eed. N\u00f3 l\u00e0 b\u1ed9 k\u00fd t\u1ef1 7 bit ch\u1ee9a 128 k\u00fd t\u1ef1 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ti\u1ebfng Anh, bao g\u1ed3m c\u00e1c k\u00fd t\u1ef1 \u0111i\u1ec1u khi\u1ec3n, ch\u1eef s\u1ed1, ch\u1eef hoa v\u00e0 ch\u1eef th\u01b0\u1eddng v\u00e0 m\u1ed9t s\u1ed1 k\u00fd hi\u1ec7u d\u1ea5u ch\u1ea5m c\u00e2u.<\/p>\n<h2>S\u1ef1 ra \u0111\u1eddi c\u1ee7a ASCII v\u00e0 s\u1ef1 xu\u1ea5t hi\u1ec7n \u0111\u1ea7u ti\u00ean c\u1ee7a n\u00f3<\/h2>\n<p>Vi\u1ec7c t\u1ea1o ra ASCII b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng ng\u00e0y \u0111\u1ea7u c\u1ee7a m\u00e1y t\u00ednh. Robert W. Bemer, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cCha \u0111\u1ebb c\u1ee7a ASCII\u201d, \u0111\u00e3 l\u00e3nh \u0111\u1ea1o nh\u00f3m ph\u00e1t tri\u1ec3n \u0111\u1eb7c t\u1ea3 ASCII g\u1ed1c v\u00e0o \u0111\u1ea7u nh\u1eefng n\u0103m 1960. N\u00f3 \u0111\u01b0\u1ee3c Vi\u1ec7n Ti\u00eau chu\u1ea9n Qu\u1ed1c gia Hoa K\u1ef3 (ANSI) gi\u1edbi thi\u1ec7u l\u1ea7n \u0111\u1ea7u ti\u00ean v\u00e0o n\u0103m 1963 nh\u01b0 m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n th\u1ed1ng nh\u1ea5t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c h\u1ec7 th\u1ed1ng c\u00f4ng ngh\u1ec7 v\u00e0 m\u00e1y t\u00ednh kh\u00e1c nhau. \u0110\u00e2y l\u00e0 m\u1ed9t ti\u1ebfn b\u1ed9 \u0111\u00e1ng k\u1ec3 v\u00ec tr\u01b0\u1edbc \u0111\u00f3, c\u00f3 nhi\u1ec1u b\u1ed9 k\u00fd t\u1ef1 c\u1ea1nh tranh g\u00e2y ra v\u1ea5n \u0111\u1ec1 v\u1ec1 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch.<\/p>\n<h2>M\u1ed9t c\u00e1i nh\u00ecn s\u00e2u s\u1eafc v\u1ec1 ASCII<\/h2>\n<p>Ti\u00eau chu\u1ea9n ASCII c\u00f3 128 k\u00fd t\u1ef1 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, 33 trong s\u1ed1 \u0111\u00f3 l\u00e0 k\u00fd t\u1ef1 \u0111i\u1ec1u khi\u1ec3n kh\u00f4ng in \u0111\u01b0\u1ee3c, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch x\u1eed l\u00fd v\u0103n b\u1ea3n v\u00e0 95 k\u00fd t\u1ef1 c\u00f3 th\u1ec3 in \u0111\u01b0\u1ee3c. C\u00e1c k\u00fd t\u1ef1 n\u00e0y \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng c\u00e1c m\u00e3 s\u1ed1 n\u1eb1m trong kho\u1ea3ng t\u1eeb 0 \u0111\u1ebfn 127. V\u00ed d\u1ee5: gi\u00e1 tr\u1ecb ASCII cho &#039;A&#039; l\u00e0 65 v\u00e0 \u0111\u1ed1i v\u1edbi &#039;a&#039;, l\u00e0 97.<\/p>\n<p>ASCII \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho c\u00e1c m\u00e1y s\u1eed d\u1ee5ng ng\u00f4n ng\u1eef ti\u1ebfng Anh. Do \u0111\u00f3, n\u00f3 thi\u1ebfu c\u00e1c k\u00fd t\u1ef1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c ng\u00f4n ng\u1eef kh\u00e1c, ch\u1eb3ng h\u1ea1n nh\u01b0 d\u1ea5u tr\u1ecdng \u00e2m v\u00e0 c\u00e1c k\u00fd hi\u1ec7u \u0111\u1eb7c bi\u1ec7t. H\u1ea1n ch\u1ebf n\u00e0y \u0111\u00e3 d\u1eabn \u0111\u1ebfn vi\u1ec7c t\u1ea1o ra ASCII m\u1edf r\u1ed9ng v\u00e0 c\u00e1c s\u01a1 \u0111\u1ed3 m\u00e3 h\u00f3a kh\u00e1c nh\u01b0 Unicode.<\/p>\n<h2>C\u01a1 ch\u1ebf n\u1ed9i b\u1ed9 c\u1ee7a ASCII<\/h2>\n<p>ASCII ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch g\u00e1n m\u1ed9t s\u1ed1 nh\u1ecb ph\u00e2n b\u1ea3y bit duy nh\u1ea5t cho m\u1ed7i k\u00fd t\u1ef1. V\u00ed d\u1ee5: trong ASCII, k\u00fd t\u1ef1 &#039;A&#039; \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb l\u00e0 0100001 v\u00e0 k\u00fd t\u1ef1 &#039;B&#039; l\u00e0 0100010. C\u00e1c c\u00e1ch bi\u1ec3u di\u1ec5n nh\u1ecb ph\u00e2n n\u00e0y cho ph\u00e9p m\u00e1y t\u00ednh v\u00e0 c\u00e1c m\u00e1y kh\u00e1c di\u1ec5n gi\u1ea3i v\u00e0 hi\u1ec3n th\u1ecb c\u00e1c k\u00fd t\u1ef1 m\u1ed9t c\u00e1ch nh\u1ea5t qu\u00e1n v\u00e0 chu\u1ea9n m\u1ef1c.<\/p>\n<p>Khi nh\u1ea5n m\u1ed9t ph\u00edm tr\u00ean b\u00e0n ph\u00edm, gi\u00e1 tr\u1ecb ASCII t\u01b0\u01a1ng \u1ee9ng s\u1ebd \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn m\u00e1y t\u00ednh. Gi\u00e1 tr\u1ecb ASCII n\u00e0y sau \u0111\u00f3 \u0111\u01b0\u1ee3c d\u1ecbch tr\u1edf l\u1ea1i th\u00e0nh m\u1ed9t k\u00fd t\u1ef1, \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u00ean m\u00e0n h\u00ecnh ho\u1eb7c \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo c\u00e1ch n\u00e0o \u0111\u00f3, ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111\u01b0\u1ee3c ghi v\u00e0o m\u1ed9t t\u1ec7p.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a ASCII<\/h2>\n<ul>\n<li>\n<p><strong>Ti\u00eau chu\u1ea9n h\u00f3a<\/strong>: ASCII cung c\u1ea5p m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c ti\u00eau chu\u1ea9n h\u00f3a \u0111\u1ec3 th\u1ec3 hi\u1ec7n c\u00e1c k\u00fd t\u1ef1 trong c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed, \u0111\u1ea3m b\u1ea3o t\u00ednh t\u01b0\u01a1ng th\u00edch v\u00e0 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c h\u1ec7 th\u1ed1ng kh\u00e1c nhau.<\/p>\n<\/li>\n<li>\n<p><strong>S\u1ef1 \u0111\u01a1n gi\u1ea3n<\/strong>: Ch\u1ec9 v\u1edbi 128 k\u00fd t\u1ef1 trong ti\u00eau chu\u1ea9n c\u01a1 b\u1ea3n, ASCII t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u01a1n gi\u1ea3n, gi\u00fap t\u0103ng hi\u1ec7u qu\u1ea3 v\u00e0 t\u1ed1c \u0111\u1ed9 th\u1ef1c thi.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110i\u1ec1u khi\u1ec3n nh\u00e2n v\u1eadt<\/strong>: ASCII bao g\u1ed3m m\u1ed9t s\u1ed1 k\u00fd t\u1ef1 \u0111i\u1ec1u khi\u1ec3n kh\u00f4ng in \u0111\u01b0\u1ee3c nh\u1eb1m cung c\u1ea5p h\u01b0\u1edbng d\u1eabn cho thi\u1ebft b\u1ecb v\u1ec1 c\u00e1ch x\u1eed l\u00fd c\u00e1c k\u00fd t\u1ef1 ti\u1ebfp theo.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i ASCII<\/h2>\n<p>C\u00f3 hai phi\u00ean b\u1ea3n ch\u00ednh c\u1ee7a ASCII:<\/p>\n<ul>\n<li>\n<p><strong>Ti\u00eau chu\u1ea9n ASCII<\/strong>: Chu\u1ea9n ASCII 7 bit g\u1ed1c bao g\u1ed3m 128 k\u00fd t\u1ef1 (0-127), bao g\u1ed3m k\u00fd t\u1ef1 \u0111i\u1ec1u khi\u1ec3n, s\u1ed1, k\u00fd t\u1ef1 \u0111\u1eb7c bi\u1ec7t v\u00e0 ch\u1eef c\u00e1i ti\u1ebfng Anh vi\u1ebft hoa v\u00e0 vi\u1ebft th\u01b0\u1eddng.<\/p>\n<\/li>\n<li>\n<p><strong>ASCII m\u1edf r\u1ed9ng<\/strong>: Phi\u00ean b\u1ea3n 8 bit n\u00e0y bao g\u1ed3m th\u00eam 128 k\u00fd t\u1ef1 (128-255), cung c\u1ea5p nhi\u1ec1u k\u00fd hi\u1ec7u, k\u00fd t\u1ef1 \u0111\u1eb7c bi\u1ec7t v\u00e0 ch\u1eef c\u00e1i c\u00f3 d\u1ea5u. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c ng\u00f4n ng\u1eef v\u00e0 k\u00fd hi\u1ec7u kh\u00f4ng c\u00f3 trong ti\u00eau chu\u1ea9n ban \u0111\u1ea7u.<\/p>\n<\/li>\n<\/ul>\n<p>ASCII c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a k\u00fd t\u1ef1 kh\u00e1c nh\u01b0:<\/p>\n<ul>\n<li>\n<p><strong>b\u1ea3ng m\u00e3 Unicode<\/strong>: M\u1ed9t ti\u00eau chu\u1ea9n \u0111i\u1ec7n to\u00e1n cung c\u1ea5p m\u1ed9t s\u1ed1 duy nh\u1ea5t cho m\u1ed7i k\u00fd t\u1ef1 b\u1ea5t k\u1ec3 n\u1ec1n t\u1ea3ng, ch\u01b0\u01a1ng tr\u00ecnh ho\u1eb7c ng\u00f4n ng\u1eef.<\/p>\n<\/li>\n<li>\n<p><strong>ISO 8859<\/strong>: M\u1ed9t b\u1ed9 ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a li\u00ean quan \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n b\u1edfi T\u1ed5 ch\u1ee9c Ti\u00eau chu\u1ea9n h\u00f3a Qu\u1ed1c t\u1ebf (ISO), v\u1edbi m\u1ed9t s\u1ed1 ph\u1ea7n, m\u1ed7i ph\u1ea7n m\u00e3 h\u00f3a m\u1ed9t b\u1ed9 ng\u00f4n ng\u1eef.<\/p>\n<\/li>\n<\/ul>\n<h2>ASCII: \u1ee8ng d\u1ee5ng, th\u00e1ch th\u1ee9c v\u00e0 gi\u1ea3i ph\u00e1p<\/h2>\n<p>ASCII c\u00f3 m\u1eb7t kh\u1eafp n\u01a1i trong \u0111i\u1ec7n to\u00e1n v\u00e0 truy\u1ec1n th\u00f4ng k\u1ef9 thu\u1eadt s\u1ed1. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong l\u1eadp tr\u00ecnh, bi\u1ec3u di\u1ec5n d\u1eef li\u1ec7u, t\u1ea1o giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng d\u1ef1a tr\u00ean v\u0103n b\u1ea3n v\u00e0 l\u00e0 th\u00e0nh ph\u1ea7n c\u01a1 b\u1ea3n c\u1ee7a m\u00e3 h\u00f3a email v\u00e0 trang web. Ngh\u1ec7 thu\u1eadt ASCII, n\u01a1i h\u00ecnh \u1ea3nh \u0111\u01b0\u1ee3c t\u1ea1o b\u1eb1ng c\u00e1c k\u00fd t\u1ef1 ASCII, l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c bi\u1ec3u \u0111\u1ea1t ph\u1ed5 bi\u1ebfn tr\u00ean internet.<\/p>\n<p>M\u1ed9t trong nh\u1eefng th\u00e1ch th\u1ee9c ch\u00ednh c\u1ee7a ASCII l\u00e0 b\u1ed9 k\u00fd t\u1ef1 h\u1ea1n ch\u1ebf, ph\u1ea7n l\u1edbn ch\u1ec9 gi\u1edbi h\u1ea1n \u1edf c\u00e1c k\u00fd t\u1ef1 ti\u1ebfng Anh kh\u00f4ng c\u00f3 d\u1ea5u. C\u00e1c ti\u00eau chu\u1ea9n ASCII, Unicode v\u00e0 ISO 8859 m\u1edf r\u1ed9ng \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1ec3 gi\u1ea3i quy\u1ebft h\u1ea1n ch\u1ebf n\u00e0y v\u00e0 th\u1ec3 hi\u1ec7n nhi\u1ec1u lo\u1ea1i k\u00fd t\u1ef1 v\u00e0 k\u00fd hi\u1ec7u h\u01a1n.<\/p>\n<h2>ASCII so v\u1edbi c\u00e1c s\u01a1 \u0111\u1ed3 m\u00e3 h\u00f3a kh\u00e1c<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 so s\u00e1nh ng\u1eafn g\u1ecdn v\u1ec1 ASCII, Extended ASCII v\u00e0 Unicode:<\/p>\n<table>\n<thead>\n<tr>\n<th>B\u1ed9 k\u00fd t\u1ef1<\/th>\n<th>S\u1ed1 Bit<\/th>\n<th>S\u1ed1 l\u01b0\u1ee3ng k\u00fd t\u1ef1<\/th>\n<th>H\u1ed7 tr\u1ee3 ng\u00f4n ng\u1eef<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ASCII<\/td>\n<td>7<\/td>\n<td>128<\/td>\n<td>Ti\u1ebfng Anh c\u0103n b\u1ea3n<\/td>\n<\/tr>\n<tr>\n<td>ASCII m\u1edf r\u1ed9ng<\/td>\n<td>8<\/td>\n<td>256<\/td>\n<td>Ng\u00f4n ng\u1eef b\u1ed5 sung h\u1ea1n ch\u1ebf<\/td>\n<\/tr>\n<tr>\n<td>b\u1ea3ng m\u00e3 Unicode<\/td>\n<td>C\u00f3 th\u1ec3 thay \u0111\u1ed5i (t\u1ed1i \u0111a 32)<\/td>\n<td>Tr\u00ean 130.000<\/td>\n<td>Ng\u00f4n ng\u1eef to\u00e0n c\u1ea7u<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Tri\u1ec3n v\u1ecdng t\u01b0\u01a1ng lai c\u1ee7a ASCII<\/h2>\n<p>B\u1ea5t ch\u1ea5p s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng m\u00e3 h\u00f3a k\u00fd t\u1ef1 ti\u00ean ti\u1ebfn h\u01a1n, t\u00ednh \u0111\u01a1n gi\u1ea3n, hi\u1ec7u qu\u1ea3 v\u00e0 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch r\u1ed9ng c\u1ee7a ASCII \u0111\u1ea3m b\u1ea3o t\u00ednh li\u00ean quan li\u00ean t\u1ee5c c\u1ee7a n\u00f3. N\u00f3 c\u00f3 kh\u1ea3 n\u0103ng v\u1eabn l\u00e0 m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ed1i v\u1edbi c\u00e1c ho\u1ea1t \u0111\u1ed9ng \u0111i\u1ec7n to\u00e1n c\u1ea5p th\u1ea5p h\u01a1n v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng c\u0169.<\/p>\n<p>Khi h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, \u1ea3nh h\u01b0\u1edfng c\u1ee7a ASCII th\u1ec3 hi\u1ec7n r\u00f5 trong c\u00e1c l\u0129nh v\u1ef1c nh\u01b0 bi\u1ec3u t\u01b0\u1ee3ng c\u1ea3m x\u00fac v\u00e0 c\u00e1c h\u00ecnh th\u1ee9c bi\u1ec3u \u0111\u1ea1t k\u1ef9 thu\u1eadt s\u1ed1 kh\u00e1c. B\u1ed9 k\u00fd t\u1ef1 khi\u00eam t\u1ed1n n\u00e0y \u0111\u00e3 \u0111\u1eb7t n\u1ec1n t\u1ea3ng cho c\u00e1ch ch\u00fang ta m\u00e3 h\u00f3a c\u1ea3m x\u00fac v\u00e0 \u00fd ngh\u0129a trong c\u00e1c t\u01b0\u01a1ng t\u00e1c k\u1ef9 thu\u1eadt s\u1ed1 ng\u00e0y c\u00e0ng t\u0103ng c\u1ee7a ch\u00fang ta.<\/p>\n<h2>M\u00e1y ch\u1ee7 ASCII v\u00e0 Proxy<\/h2>\n<p>Trong b\u1ed1i c\u1ea3nh c\u00e1c m\u00e1y ch\u1ee7 proxy gi\u1ed1ng nh\u01b0 c\u00e1c m\u00e1y ch\u1ee7 do OneProxy cung c\u1ea5p, ASCII \u0111\u00f3ng m\u1ed9t vai tr\u00f2 c\u01a1 b\u1ea3n. C\u00e1c m\u00e1y ch\u1ee7 proxy v\u1ec1 c\u01a1 b\u1ea3n \u0111\u00f3ng vai tr\u00f2 l\u00e0 ng\u01b0\u1eddi trung gian cho c\u00e1c y\u00eau c\u1ea7u t\u1eeb kh\u00e1ch h\u00e0ng \u0111ang t\u00ecm ki\u1ebfm t\u00e0i nguy\u00ean t\u1eeb c\u00e1c m\u00e1y ch\u1ee7 kh\u00e1c. Giao ti\u1ebfp gi\u1eefa m\u00e1y kh\u00e1ch, m\u00e1y ch\u1ee7 proxy v\u00e0 m\u00e1y ch\u1ee7 \u0111\u00edch th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn ASCII, \u0111\u1eb7c bi\u1ec7t khi x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u v\u00e0 ph\u1ea3n h\u1ed3i HTTP d\u1ef1a tr\u00ean v\u0103n b\u1ea3n v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a b\u1eb1ng ASCII.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.asciitable.com\/\" target=\"_new\" rel=\"noopener nofollow\">B\u1ea3ng ASCII \u2013 Danh s\u00e1ch k\u00fd t\u1ef1 \u0111\u1ea7y \u0111\u1ee7<\/a><\/li>\n<li><a href=\"https:\/\/www.cs.cmu.edu\/~pattis\/15-1XX\/common\/handouts\/ascii.html\" target=\"_new\" rel=\"noopener nofollow\">Hi\u1ec3u m\u00e3 ASCII<\/a><\/li>\n<li><a href=\"https:\/\/www.ansi.org\/\" target=\"_new\" rel=\"noopener nofollow\">Vi\u1ec7n Ti\u00eau chu\u1ea9n Qu\u1ed1c gia Hoa K\u1ef3 (ANSI)<\/a><\/li>\n<li><a href=\"https:\/\/home.unicode.org\/\" target=\"_new\" rel=\"noopener nofollow\">Hi\u1ec7p h\u1ed9i Unicode<\/a><\/li>\n<li><a href=\"https:\/\/www.iso.org\/home.html\" target=\"_new\" rel=\"noopener nofollow\">T\u1ed5 ch\u1ee9c Ti\u00eau chu\u1ea9n h\u00f3a Qu\u1ed1c t\u1ebf (ISO)<\/a><\/li>\n<\/ul>\n<p>T\u00f3m l\u1ea1i, ASCII l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng m\u00e3 h\u00f3a \u0111\u01a1n gi\u1ea3n nh\u01b0ng m\u1ea1nh m\u1ebd, \u0111\u1eb7t n\u1ec1n m\u00f3ng cho truy\u1ec1n th\u00f4ng k\u1ef9 thu\u1eadt s\u1ed1 nh\u01b0 ch\u00fang ta bi\u1ebft. B\u1ea5t ch\u1ea5p nh\u1eefng h\u1ea1n ch\u1ebf c\u1ee7a n\u00f3, n\u00f3 v\u1eabn ti\u1ebfp t\u1ee5c \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng m\u00e3 h\u00f3a m\u1edbi v\u00e0 v\u1eabn l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n quan tr\u1ecdng trong l\u0129nh v\u1ef1c \u0111i\u1ec7n to\u00e1n v\u00e0 truy\u1ec1n th\u00f4ng k\u1ef9 thu\u1eadt s\u1ed1.<\/p>","protected":false},"featured_media":467640,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-475915","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>ASCII: An Essential Component of Computer Communication<\/mark>","faq_items":[{"question":"What is ASCII?","answer":"<p>ASCII, or American Standard Code for Information Interchange, is a character encoding standard that is used in computer science and electronic communication. It contains a set of 128 characters, including control characters, digits, uppercase and lowercase letters, and various punctuation symbols.<\/p>"},{"question":"When was ASCII first introduced and by whom?","answer":"<p>ASCII was first introduced by the American National Standards Institute (ANSI) in 1963. The team that developed the original ASCII specification was led by Robert W. Bemer, who is often referred to as the \"Father of ASCII.\"<\/p>"},{"question":"How does ASCII work?","answer":"<p>ASCII works by assigning a unique seven-bit binary number to each character. When a key is pressed on the keyboard, the corresponding ASCII value is sent to the computer. This ASCII value is then translated back into a character, which is displayed on the screen or processed in some way.<\/p>"},{"question":"What are the main features of ASCII?","answer":"<p>ASCII provides a standardized method to represent characters in electronic devices, ensuring compatibility and interoperability between different systems. It includes several non-printing control characters that provide instructions to devices on how to handle subsequent characters.<\/p>"},{"question":"What are the different types of ASCII?","answer":"<p>There are two main versions of ASCII: Standard ASCII and Extended ASCII. Standard ASCII is the original 7-bit ASCII standard with 128 characters. Extended ASCII is an 8-bit version that includes an additional 128 characters, offering more symbols, special characters, and accented letters.<\/p>"},{"question":"How is ASCII used and what are the common problems associated with it?","answer":"<p>ASCII is used extensively in computing and digital communication, including programming, data representation, creating text-based user interfaces, and in emails and website coding. One primary challenge of ASCII is its limited character set, which is largely confined to unaccented English characters. This limitation has been addressed with the development of Extended ASCII, Unicode, and ISO 8859 standards.<\/p>"},{"question":"How does ASCII compare with other encoding schemes?","answer":"<p>ASCII uses 7 bits to represent 128 characters and supports basic English. In contrast, Extended ASCII uses 8 bits for 256 characters and supports additional languages. Unicode uses variable bits (up to 32) and supports over 130,000 characters from global languages.<\/p>"},{"question":"What are the future prospects of ASCII?","answer":"<p>Despite the evolution of more advanced character encoding systems, ASCII's simplicity, efficiency, and wide compatibility ensure its continued relevance. It is likely to remain integral to lower-level computing operations and legacy systems. It also influences areas such as emoji and other forms of digital expression.<\/p>"},{"question":"How is ASCII related to proxy servers?","answer":"<p>In the context of proxy servers, ASCII plays a fundamental role, particularly in handling HTTP requests and responses, which are text-based and often encoded in ASCII. The communication between client computers, proxy servers, and target servers often involves ASCII.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/475915","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/475915\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/467640"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=475915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}