diff --git a/runtime/doc/tags b/runtime/doc/tags
index 229a4ef..48f582b 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -1157,6 +1157,7 @@
 't_vi'	term.txt	/*'t_vi'*
 't_vs'	term.txt	/*'t_vs'*
 't_xn'	term.txt	/*'t_xn'*
+'t_xo'	term.txt	/*'t_xo'*
 't_xs'	term.txt	/*'t_xs'*
 'ta'	options.txt	/*'ta'*
 'tabline'	options.txt	/*'tabline'*
@@ -10403,6 +10404,7 @@
 t_vi	term.txt	/*t_vi*
 t_vs	term.txt	/*t_vs*
 t_xn	term.txt	/*t_xn*
+t_xo	term.txt	/*t_xo*
 t_xs	term.txt	/*t_xs*
 tab	intro.txt	/*tab*
 tab-page	tabpage.txt	/*tab-page*
diff --git a/runtime/doc/term.txt b/runtime/doc/term.txt
index d958229..1256d75 100644
--- a/runtime/doc/term.txt
+++ b/runtime/doc/term.txt
@@ -1,4 +1,4 @@
-*term.txt*      For Vim version 9.1.  Last change: 2024 Feb 28
+*term.txt*      For Vim version 9.1.  Last change: 2024 Apr 14
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -382,7 +382,7 @@
 the last two characters of the option name.  Only one termcap code is
 required: Cursor motion, 't_cm'.
 
-The options 't_da', 't_db', 't_ms', 't_xs', 't_xn' represent flags in the
+The options 't_da', 't_db', 't_ms', 't_xs', 't_xn', 't_xo' represent flags in the
 termcap.  When the termcap flag is present, the option will be set to "y".
 But any non-empty string means that the flag is set.  An empty string means
 that the flag is not set.  't_CS' works like this too, but it isn't a termcap
@@ -441,6 +441,11 @@
 								*t_xn* *'t_xn'*
 	t_xn	if non-empty, writing a character at the last screen cell
 		does not cause scrolling
+								*t_xo* *'t_xo'*
+	t_xo	if non-empty, terminal uses xon/xoff handshaking, mapping
+		CTRL-S will not be possible then, since it is used for flow
+		control (used by vt420 terminal).  Setting this flag has only
+		an effect when starting Vim.
 	t_ZH	italics mode					*t_ZH* *'t_ZH'*
 	t_ZR	italics end					*t_ZR* *'t_ZR'*
 
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index 30fd791..69604e9 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2024 Apr 08
+*version9.txt*  For Vim version 9.1.  Last change: 2024 Apr 14
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41591,6 +41591,7 @@
 Options: ~
 
 'winfixbuf'		Keep buffer focused in a window
+'t_xo'			Terminal uses XON/XOFF handshaking (e.g. vt420).
 
 ==============================================================================
 INCOMPATIBLE CHANGES				*incompatible-9.2*
diff --git a/src/optiondefs.h b/src/optiondefs.h
index 98e23c6..33e3165 100644
--- a/src/optiondefs.h
+++ b/src/optiondefs.h
@@ -3014,6 +3014,7 @@
     p_term("t_8f", T_8F)
     p_term("t_8b", T_8B)
     p_term("t_8u", T_8U)
+    p_term("t_xo", T_XON)
 
 // terminal key codes are not in here
 
diff --git a/src/os_unix.c b/src/os_unix.c
index da7f56a..d155142 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -3766,7 +3766,8 @@
     {
 	// ~ICRNL enables typing ^V^M
 	// ~IXON disables CTRL-S stopping output, so that it can be mapped.
-	tnew.c_iflag &= ~(ICRNL | IXON);
+	tnew.c_iflag &= ~(ICRNL |
+		(T_XON == NULL || *T_XON == NUL ? IXON : 0));
 	tnew.c_lflag &= ~(ICANON | ECHO | ISIG | ECHOE
 # if defined(IEXTEN)
 		    | IEXTEN	    // IEXTEN enables typing ^V on SOLARIS
diff --git a/src/term.c b/src/term.c
index 8aa86ce..7e39b03 100644
--- a/src/term.c
+++ b/src/term.c
@@ -1798,6 +1798,8 @@
 	T_DA = (char_u *)"y";
     if ((T_UT == NULL || T_UT == empty_option) && tgetflag("ut") > 0)
 	T_UT = (char_u *)"y";
+    if ((T_XON == NULL || T_XON == empty_option) && tgetflag("xo") > 0)
+	T_XON = (char_u *)"y";
 
     /*
      * get key codes
diff --git a/src/termdefs.h b/src/termdefs.h
index f28fd19..2b65abb 100644
--- a/src/termdefs.h
+++ b/src/termdefs.h
@@ -115,10 +115,11 @@
     KS_SRI,	// restore icon text
     KS_FD,	// disable focus event tracking
     KS_FE,	// enable focus event tracking
-    KS_CF	// set terminal alternate font
+    KS_CF,	// set terminal alternate font
+    KS_XON	// terminal uses xon/xoff handshaking
 };
 
-#define KS_LAST	    KS_CF
+#define KS_LAST	    KS_XON
 
 /*
  * the terminal capabilities are stored in this array
@@ -224,6 +225,7 @@
 #define T_SRI	(TERM_STR(KS_SRI))	// restore icon text
 #define T_FD	(TERM_STR(KS_FD))	// disable focus event tracking
 #define T_FE	(TERM_STR(KS_FE))	// enable focus event tracking
+#define T_XON	(TERM_STR(KS_XON))	// terminal uses xon/xoff handshaking
 
 typedef enum {
     TMODE_COOK,	    // terminal mode for external cmds and Ex mode
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 7c86bcd..c9ece88 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -3792,4 +3792,22 @@
   call assert_equal("\"b Xbuf_complete/Foobar.c Xbuf_complete/MyFoobar.c AFoobar.h", @:)
 endfunc
 
+" :set t_??
+func Test_term_option()
+  set wildoptions&
+  let _cpo = &cpo
+  set cpo-=C
+  let expected='"set t_AB t_AF t_AU t_AL t_al t_bc t_BE t_BD t_cd t_ce t_Ce t_CF t_cl t_cm'
+        \ .. ' t_Co t_CS t_Cs t_cs t_CV t_da t_db t_DL t_dl t_ds t_Ds t_EC t_EI t_fs t_fd t_fe'
+        \ .. ' t_GP t_IE t_IS t_ke t_ks t_le t_mb t_md t_me t_mr t_ms t_nd t_op t_RF t_RB t_RC'
+        \ .. ' t_RI t_Ri t_RK t_RS t_RT t_RV t_Sb t_SC t_se t_Sf t_SH t_SI t_Si t_so t_SR t_sr'
+        \ .. ' t_ST t_Te t_te t_TE t_ti t_TI t_Ts t_ts t_u7 t_ue t_us t_Us t_ut t_vb t_ve t_vi'
+        \ .. ' t_VS t_vs t_WP t_WS t_XM t_xn t_xs t_ZH t_ZR t_8f t_8b t_8u t_xo t_#2 t_#4 t_%i'
+        \ .. ' t_*7 t_@7 t_F1 t_F2 t_k1 t_k2 t_k3 t_k4 t_k5 t_k6 t_k7 t_k8 t_k9 t_k; t_kB t_kD'
+        \ .. ' t_kI t_kN t_kP t_kb t_kd t_kh t_kl t_kr t_ku'
+  call feedkeys(":set t_\<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal(expected, @:)
+  let &cpo = _cpo
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/testdir/test_terminal3.vim b/src/testdir/test_terminal3.vim
index 96a9e63..223bcc5 100644
--- a/src/testdir/test_terminal3.vim
+++ b/src/testdir/test_terminal3.vim
@@ -931,5 +931,25 @@
   delfunc s:term_start_error
 endfunc
 
+func Test_terminal_vt420()
+  CheckRunVimInTerminal
+  " For Termcap
+  CheckUnix
+  let rows=15
+  call writefile([':set term=vt420'], 'Xterm420', 'D')
+
+  let buf = RunVimInTerminal('-S Xterm420', #{rows: rows})
+  call TermWait(buf, 100)
+  call term_sendkeys(buf, ":set t_xo?\<CR>")
+  call WaitForAssert({-> assert_match('t_xo=y', term_getline(buf, rows))})
+  call StopVimInTerminal(buf)
+
+  call writefile([''], 'Xterm420')
+  let buf = RunVimInTerminal('-S Xterm420', #{rows: rows})
+  call TermWait(buf, 100)
+  call term_sendkeys(buf, ":set t_xo?\<CR>")
+  call WaitForAssert({-> assert_match('t_xo=\s\+', term_getline(buf, rows))})
+  call StopVimInTerminal(buf)
+endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 57849eb..d203973 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    321,
+/**/
     320,
 /**/
     319,