The KOI8-U encoding is widely used for Ukrainian language. It is defined in RFC2319 and is very similar to KOI8-R except some letters.
The following patch against version 4.0.3 adds corresponding definitions to code. External encoding file is added. diff -u -rNu ansi.h ansi.h --- ansi.h 2003-02-24 18:55:08.000000000 +0200 +++ ansi.h 2011-03-29 11:24:20.212563516 +0300 @@ -127,6 +127,7 @@ #define BIG5 5 #define KOI8R 6 #define CP1251 7 +#define KOI8U 8 #define GBK 20 #define EUC EUC_JP diff -u -rNu doc/screen.1 doc/screen.1 --- doc/screen.1 2003-12-05 15:51:57.000000000 +0200 +++ doc/screen.1 2011-03-29 11:22:55.739089194 +0300 @@ -1688,8 +1688,9 @@ There is also a way to select a terminal encoding depending on the terminal type by using the \*QKJ\*U termcap entry. -Supported encodings are eucJP, SJIS, eucKR, eucCN, Big5, GBK, KOI8-R, -CP1251, UTF-8, ISO8859-2, ISO8859-3, ISO8859-4, ISO8859-5, ISO8859-6, +Supported encodings are eucJP, SJIS, eucKR, eucCN, Big5, GBK, +KOI8-R, KOI8-U, CP1251, UTF-8, +ISO8859-2, ISO8859-3, ISO8859-4, ISO8859-5, ISO8859-6, ISO8859-7, ISO8859-8, ISO8859-9, ISO8859-10, ISO8859-15, jis. See also \*Qdefencoding\*U, which changes the default setting of a new diff -u -rNu doc/screen.texinfo doc/screen.texinfo --- doc/screen.texinfo 2003-12-05 15:51:46.000000000 +0200 +++ doc/screen.texinfo 2011-03-29 11:22:30.536269863 +0300 @@ -2726,7 +2726,8 @@ Supported encodings are @code{eucJP}, @code{SJIS}, @code{eucKR}, -@code{eucCN}, @code{Big5}, @code{GBK}, @code{KOI8-R}, @code{CP1251}, +@code{eucCN}, @code{Big5}, @code{GBK}, +@code{KOI8-R}, @code{KOI8-U}, @code{CP1251}, @code{UTF-8}, @code{ISO8859-2}, @code{ISO8859-3}, @code{ISO8859-4}, @code{ISO8859-5}, @code{ISO8859-6}, @code{ISO8859-7}, @code{ISO8859-8}, @code{ISO8859-9}, diff -u -rNu encoding.c encoding.c --- encoding.c 2006-10-23 15:58:14.000000000 +0300 +++ encoding.c 2011-03-29 11:23:56.454204244 +0300 @@ -57,6 +57,7 @@ /* big5 font: ^X */ /* KOI8-R font: 96 ! */ +/* KOI8-U font: 96 # */ /* CP1251 font: 96 ? */ struct encoding encodings[] = { @@ -67,6 +68,7 @@ { "eucCN", "B\001BB01", 0, 1, 0, "\001" }, { "Big5", "B\030BB01", 0, 1, 0, "\030" }, { "KOI8-R", 0, 0x80|'!', 0, 1, 0 }, + { "KOI8-U", 0, 0x80|'#', 0, 1, 0 }, { "CP1251", 0, 0x80|'?', 0, 1, 0 }, { "UTF-8", 0, -1, 0, 0, 0 }, { "ISO8859-2", 0, 0x80|'B', 0, 0, 0 }, UUE of encoding file: begin 644 utf8encodings/a3 M4V-R965N23)55$8X`*,`@$M/23@M50```(`E``"!)0(`@B4,`(,E$`"$)10` MA248`(8E'`"')20`B"4L`(DE-`"*)3P`BR6``(PEA`"-)8@`CB6,`(\ED`"0 M)9$`D262`)(EDP"3(R``E"6@`)4B&0"6(AH`ER)(`)@B9`"9(F4`F@"@`)LC M(0"<`+``G0"R`)X`MP"?`/<`H"50`*$E40"B)5(`HP11`*0$5`"E)50`I@16 M`*<$5P"H)5<`J258`*HE60"K)5H`K"5;`*T$D0"N)5T`KR5>`+`E7P"Q)6`` MLB5A`+,$`0"T!`,`M25C`+8$!@"W!`<`N"5F`+DE9P"Z)6@`NR5I`+PE:@"] M!)``OB5L`+\`J0#`!$X`P00P`,($,0##!$8`Q`0T`,4$-0#&!$0`QP0S`,@$ M10#)!#@`R@0Y`,L$.@#,!#L`S00\`,X$/0#/!#X`T`0_`-$$3P#2!$``TP1! M`-0$0@#5!$,`U@0V`-<$,@#8!$P`V01+`-H$-P#;!$@`W`1-`-T$20#>!$<` MWP1*`.`$+@#A!!``X@01`.,$)@#D!!0`Y005`.8$)`#G!!,`Z`0E`.D$&`#J M!!D`ZP0:`.P$&P#M!!P`[@0=`.\$'@#P!!\`\00O`/($(`#S!"$`]`0B`/4$ I(P#V!!8`]P02`/@$+`#Y!"L`^@07`/L$*`#\!"T`_00I`/X$)P#_!"H` ` end -netch-