diff --git a/devamlc.h b/devamlc.h
index 41fec9b..245c5bd 100644
--- a/devamlc.h
+++ b/devamlc.h
@@ -262,6 +262,7 @@ int devamlc (int class, int func, int device) {
     unsigned short ctinterrupt;         /* 1 bit per line */
     unsigned short dss;                 /* 1 bit per line */
     unsigned short connected;           /* 1 bit per line */
+    unsigned short dolineclear;         /* 1 bit per line */
     unsigned short serial;              /* true if any CT_SERIAL lines */
     unsigned short dsstime;             /* countdown to dss poll */
              short fd[16];              /* Unix fd, 1 per line */
@@ -329,6 +330,7 @@ int devamlc (int class, int func, int device) {
       for (dx=0; dx<MAXBOARDS; dx++) {
         dc[dx].deviceid = 0;
         dc[dx].connected = 0;
+        dc[dx].dolineclear = 0;
         dc[dx].serial = 0;
         for (lx = 0; lx < 16; lx++) {
           dc[dx].fd[lx] = -1;
@@ -885,6 +887,7 @@ int devamlc (int class, int func, int device) {
                   close(dc[i].fd[lx]);
                 dc[i].dss |= BITMASK16(lx+1);
                 dc[i].connected |= BITMASK16(lx+1);
+                dc[i].dolineclear |= BITMASK16(lx+1);
                 dc[i].fd[lx] = fd;
                 dc[i].tstate[lx] = TS_DATA;
                 //printf("em: AMLC connection, fd=%d, device='%o, line=%d\n", fd, dc[i].deviceid, lx);
@@ -1140,6 +1143,53 @@ dorecv:
       if (dc[dx].deviceid == 0 || dc[dx].connected == 0 || dc[dx].eor)
         continue;
 
+      /* Inject xon / kill if dolineclear is true */
+
+      if (dolinecleararg)
+        for (lx = 0; lx < 16; lx++)
+          if (dc[dx].dolineclear & BITMASK16(lx+1))
+          {
+            unsigned char ch;
+            unsigned short utemp;
+            int dmcpair, lcount;
+            ea_t dmcea, dmcbufbegea, dmcbufendea;
+            unsigned short dmcnw;
+
+            if (dc[dx].bufnum)
+              dmcea = dc[dx].dmcchan + 2;
+            else
+              dmcea = dc[dx].dmcchan;
+            dmcpair = get32io(dmcea);
+            dmcbufbegea = dmcpair>>16;
+            dmcbufendea = dmcpair & 0xffff;
+            dmcnw = dmcbufendea - dmcbufbegea + 1;
+
+            if (dmcnw < 2)
+              continue;
+
+            utemp = lx<<12 | 0x0200 | 0221; /* dc1/xon */
+            put16io(utemp, dmcbufbegea);
+            dmcbufbegea = INCVA(dmcbufbegea, 1);
+
+            ch = (unsigned char)get16(MAKEVA(014, 0705));
+            utemp = lx<<12 | 0x0200 | ch; /* kill */
+            put16io(utemp, dmcbufbegea);
+            dmcbufbegea = INCVA(dmcbufbegea, 1);
+
+            dc[dx].recvlx = lx;
+            if (dmcbufbegea-1 > dmcbufendea)
+              fatal("AMLC tumble table overflowed?");
+            put16io(dmcbufbegea, dmcea);
+            if (dmcbufbegea > dmcbufendea) {          /* end of range has occurred */
+              dc[dx].bufnum = 1-dc[dx].bufnum;
+              dc[dx].eor = 1;
+              neweor = 1;
+              anyeor = 1;
+            }
+
+            dc[dx].dolineclear &= ~BITMASK16(lx+1);
+          }
+
       /* select to see which lines have data to be read */
 
       FD_ZERO(&readfds);
diff --git a/em.1 b/em.1
index 37cd052..e4272e2 100644
--- a/em.1
+++ b/em.1
@@ -145,6 +145,15 @@ on the host.  Multiple trace types may be listed, separated by
 spaces.  Tracing may be initially turned off by including the
 .I off
 trace type.
+.PP
+\fB-dolineclear\fR
+.IP
+Inject an XON (DC1, 0221) character and a line kill character into the
+input buffers each time an AMLC line receives an incoming connection.
+The system's configured line kill character is fetched from the
+DEFKIL field of FIGCOM, at address 14(0)/705.  This behavior helps
+counteract lines which have been blocked by internet vulnerability
+scanners injecting non-telnet data streams.
 .\" ---------------------------------------------------------------------------
 .SH FILES
 .TP
diff --git a/em.c b/em.c
index f87f681..ba615bb 100644
--- a/em.c
+++ b/em.c
@@ -658,6 +658,7 @@ static unsigned short *physmem = NULL; /* system's physical memory */
 
 //static ea_t tnoua_ea=0, tnou_ea=0, tsrc_ea=0;
 static int domemdump;                       /* -memdump arg */
+static int dolinecleararg;                  /* -dolineclear arg */
 
 static int tport;                           /* -tport option (incoming terminals) */
 static int nport;                           /* -nport option (PNC/Ringnet) */
@@ -4451,6 +4452,7 @@ int main (int argc, char **argv) {
 #include "dispatch.h"
 
   domemdump = 0;
+  dolinecleararg = 0;
   bootarg = NULL;
   bootfile[0] = 0;
   gv.pmap32bits = 0;
@@ -4470,6 +4472,9 @@ int main (int argc, char **argv) {
     } else if (strcmp(argv[i],"-memdump") == 0) {
       domemdump = 1;
 
+    } else if (strcmp(argv[i],"-dolineclear") == 0) {
+      dolinecleararg = 1;
+
     } else if (strcmp(argv[i],"-ss") == 0) {
       if (i+1 < argc && argv[i+1][0] != '-') {
         sscanf(argv[++i],"%o", &templ);