YUSCII is an informal name for severalJUS standards for 7-bitcharacter encoding. These include:

• JUS I.B1.002 (ISO-IR-141, ISO 646-YU), which encodesGaj's Latin alphabet, used forSerbo-Croatian andSlovenian language^[2]
• JUS I.B1.003 (ISO-IR-146), which encodesSerbian Cyrillic alphabet,^[3] and
• JUS I.B1.004 (ISO-IR-147), which encodesMacedonian Cyrillic alphabet.^[4]

The encodings are based onISO 646, 7-bitLatiniccharacter encoding standard, and were used inYugoslavia before widespread use of laterCP 852,ISO-8859-2/8859-5,Windows-1250/1251 andUnicode standards. It was named afterASCII, having the first word "American" replaced with "Yugoslav": "Yugoslav Standard Code for Information Interchange". Specific standards are also sometimes called by a local name: SLOSCII, CROSCII or SRPSCII for JUS I.B1.002, SRPSCII for JUS I.B1.003, MAKSCII for JUS I.B1.004.

JUS I.B1.002 is a national ISO 646 variant, i.e. equal to basicASCII with less frequently used symbols replaced with specific letters of Gaj's alphabet. Cyrillic standards further replace Latin alphabet letters with corresponding Cyrillic letters.Љ (lj),Њ (nj),Џ (dž) andѕ (dz) correspond to Latin digraphs, and are mapped over Latin letters which are not used in Serbian or Macedonian (q, w, x, y).

YUSCII was originally developed for teleprinters but it also spread forcomputer use. This was widely considered a bad idea amongsoftware developers who needed the original ASCII such as {, [, }, ], ^, ~, |, \ in theirsource code (an issue partly addressed bytrigraphs in C). On the other hand, an advantage of YUSCII is that it remains comparatively readable even when support for it is not available, similarly to the RussianKOI-7. Numerous attempts to replace it with something better kept failing due to limited support. Eventually,Microsoft's introduction ofcode pages, appearance ofUnicode and availability offonts finally spelled sure (but nevertheless still slow) end of YUSCII.^{[citation needed]}

Code points remained largely the same as inASCII to maintain maximum compatibility. Following table shows allocation of character codes in YUSCII. BothLatin andCyrillic glyphs are shown:

YUSCII should not be confused with the G0 Latin set for Serbian, Croatian and Slovene,^[5] or the G0 Cyrillic set for Serbian,^[6] defined byWorld System Teletext. Like YUSCII, these are based on ASCII and are where possible homologous with each other for Serbian letters. However, they make different decisions and consequently are not compatible with YUSCII. Macedonian lettersЌ andЃ are also assigned unique positions rather than the same as their Serbian equivalents, whereas the lowercase form ofЏ and the Macedonian letterЅ are not supported.^[a] The WST G0 sets are detailed below for reference.

• KOI-7, Russian equivalent.
• Cyrillic script
• Scientific transliteration
• Iskra Delta Partner, a computer with built-in YUSCII
• Galaksija (computer) § Character ROM, yet another scheme replacing ASCII characters with otherwise-missing Serbian letters

• Tabela standarda za zapisivanje (ex-)YU slova

• Character sets

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