diff --git a/cli.c b/cli.c
index 1ddd34b..033de09 100644
--- a/cli.c
+++ b/cli.c
@@ -31,10 +31,11 @@ extern char *pidPath;
 extern char *defaultVoice;
 
 /* command line options */
-const char *shortOptions = "P:V:dhv";
+const char *shortOptions = "P:V:adhv";
 const struct option longOptions[] = {
 	{"pid-path", required_argument, NULL, 'P'},
 	{"default-voice", required_argument, NULL, 'V'},
+	{"acsint", no_argument, NULL, 'a'},
 	{"debug", no_argument, NULL, 'd'},
 	{"help", no_argument, NULL, 'h'},
 	{"version", no_argument, NULL, 'v'},
@@ -79,6 +80,9 @@ void process_cli(int argc, char **argv)
 		case 'V':
 			defaultVoice = strdup(optarg);
 			break;
+		case 'a':
+			espeakup_mode = ESPEAKUP_MODE_ACSINT;
+			break;
 		case 'd':
 			debug = 1;
 			break;
diff --git a/espeak.c b/espeak.c
index 6c1bec5..510a44c 100644
--- a/espeak.c
+++ b/espeak.c
@@ -40,6 +40,21 @@ const int volumeMultiplier = 22;
 
 volatile int stop_requested = 0;
 
+static int acsint_callback(short *wav, int numsamples, espeak_EVENT * events)
+{
+	int i;
+	for (i = 0; events[i].type !=  espeakEVENT_LIST_TERMINATED; i++) {
+		if (events[i].type == espeakEVENT_MARK) {
+			int mark = atoi(events[i].id.name);
+			if ((mark < 0) || (mark > 255))
+				continue;
+			putchar(mark);
+			fflush(stdout);
+		}
+	}
+	return 0;
+}
+
 static espeak_ERROR set_frequency(struct synth_t *s, int freq,
 								  enum adjust_t adj)
 {
@@ -139,9 +154,13 @@ static espeak_ERROR stop_speech(void)
 static espeak_ERROR speak_text(struct synth_t *s)
 {
 	espeak_ERROR rc;
+	int synth_mode = 0;
 
-	rc = espeak_Synth(s->buf, s->len + 1, 0, POS_CHARACTER, 0, 0, NULL,
-					  NULL);
+	if (espeakup_mode == ESPEAKUP_MODE_ACSINT)
+		synth_mode |= espeakSSML;
+
+	rc = espeak_Synth(s->buf, s->len + 1, 0, POS_CHARACTER, 0, synth_mode,
+					  NULL, NULL);
 	return rc;
 }
 
@@ -219,6 +238,10 @@ int initialize_espeak(struct synth_t *s)
 		return -1;
 	}
 
+	/* We need a callback in acsint mode, but not in speakup mode. */
+	if (espeakup_mode == ESPEAKUP_MODE_ACSINT)
+		espeak_SetSynthCallback(acsint_callback);
+
 	/* Setup initial voice parameters */
 	if (defaultVoice) {
 		set_voice(s, defaultVoice);
diff --git a/espeakup.c b/espeakup.c
index 40b4a64..124fcc3 100644
--- a/espeakup.c
+++ b/espeakup.c
@@ -30,6 +30,7 @@
 char *pidPath = "/var/run/espeakup.pid";
 
 int debug = 0;
+enum espeakup_mode_t espeakup_mode = ESPEAKUP_MODE_SPEAKUP;
 struct queue_t *synth_queue = NULL;
 
 int self_pipe_fds[2];
@@ -99,7 +100,7 @@ int main(int argc, char **argv)
 /*
  * If we are not in debug mode, become a daemon and store the pid.
  */
-	if (!debug) {
+	if (espeakup_mode != ESPEAKUP_MODE_ACSINT && !debug) {
 		daemon(0, 1);
 		if (create_pid_file() < 0) {
 			perror("Unable to create pid file");
diff --git a/espeakup.h b/espeakup.h
index 8cd318a..57a3f29 100644
--- a/espeakup.h
+++ b/espeakup.h
@@ -31,6 +31,11 @@
 #define PACKAGE_VERSION "0.80-dev"
 #define PACKAGE_BUGREPORT "http://github.com/williamh/espeakup/issues"
 
+enum espeakup_mode_t {
+	ESPEAKUP_MODE_SPEAKUP,
+	ESPEAKUP_MODE_ACSINT
+};
+
 enum command_t {
 	CMD_SET_FREQUENCY,
 	CMD_SET_PITCH,
@@ -70,6 +75,7 @@ struct synth_t {
 
 extern struct queue_t *synth_queue;
 extern int debug;
+extern enum espeakup_mode_t espeakup_mode;
 
 extern void process_cli(int argc, char **argv);
 extern void *signal_thread(void *arg);
diff --git a/softsynth.c b/softsynth.c
index 9747963..d70c381 100644
--- a/softsynth.c
+++ b/softsynth.c
@@ -28,13 +28,103 @@
 #include "espeakup.h"
 
 /* max buffer size */
-static const size_t maxBufferSize = 1025;
+/* A big fat buffer. */
+static const size_t maxBufferSize = 16 * 1024 + 1;
 
 /* synth flush character */
 static const int synthFlushChar = 0x18;
 
+
 static int softFD = 0;
 
+/* Text accumulator: */
+char *textAccumulator;
+int textAccumulator_l;
+
+/* String routines, borrowed from edbrowse: */
+char *EMPTYSTRING = "";
+
+void *allocMem(size_t n)
+{
+	void *s;
+	if (!n)
+		return EMPTYSTRING;
+	if (!(s = malloc(n))) {
+		fprintf(stderr, "Out of memory!\n");
+		exit(1);
+	}
+	return s;
+}								/* allocMem */
+
+void *reallocMem(void *p, size_t n)
+{
+	void *s;
+	if (!n) {
+		fprintf(stderr, "Trying to reallocate memory with size of 0.\n");
+		exit(1);
+	}
+	if (!p) {
+		fprintf(stderr, "realloc called with a NULL pointer!\n");
+		exit(1);
+	}
+	if (p == EMPTYSTRING)
+		return allocMem(n);
+	if (!(s = realloc(p, n))) {
+		fprintf(stderr, "Failed to allocate memory.\n");
+		exit(1);
+	}
+	return s;
+}								/* reallocMem */
+
+char *initString(int *l)
+{
+	*l = 0;
+	return EMPTYSTRING;
+}
+
+void stringAndString(char **s, int *l, const char *t)
+{
+	char *p = *s;
+	int oldlen, newlen, x;
+	oldlen = *l;
+	newlen = oldlen + strlen(t);
+	*l = newlen;
+	++newlen;					/* room for the 0 */
+	x = oldlen ^ newlen;
+	if (x > oldlen) {			/* must realloc */
+		newlen |= (newlen >> 1);
+		newlen |= (newlen >> 2);
+		newlen |= (newlen >> 4);
+		newlen |= (newlen >> 8);
+		newlen |= (newlen >> 16);
+		p = reallocMem(p, newlen);
+		*s = p;
+	}
+	strcpy(p + oldlen, t);
+}								/* stringAndString */
+
+void stringAndBytes(char **s, int *l, const char *t, int cnt)
+{
+	char *p = *s;
+	int oldlen, newlen, x;
+	oldlen = *l;
+	newlen = oldlen + cnt;
+	*l = newlen;
+	++newlen;
+	x = oldlen ^ newlen;
+	if (x > oldlen) {			/* must realloc */
+		newlen |= (newlen >> 1);
+		newlen |= (newlen >> 2);
+		newlen |= (newlen >> 4);
+		newlen |= (newlen >> 8);
+		newlen |= (newlen >> 16);
+		p = reallocMem(p, newlen);
+		*s = p;
+	}
+	memcpy(p + oldlen, t, cnt);
+	p[oldlen + cnt] = 0;
+}								/* stringAndBytes */
+
 static void queue_add_cmd(enum command_t cmd, enum adjust_t adj, int value)
 {
 	struct espeak_entry_t *entry;
@@ -147,8 +237,15 @@ static int process_command(struct synth_t *s, char *buf, int start)
 		break;
 	}
 
-	if (cmd != CMD_FLUSH && cmd != CMD_UNKNOWN)
+	if (cmd != CMD_FLUSH && cmd != CMD_UNKNOWN) {
+		if (espeakup_mode == ESPEAKUP_MODE_ACSINT
+			&& textAccumulator_l != 0) {
+			queue_add_text(textAccumulator, textAccumulator_l);
+			free(textAccumulator);
+			textAccumulator = initString(&textAccumulator_l);
+		}
 		queue_add_cmd(cmd, adj, value);
+	}
 
 	return cp - (buf + start);
 }
@@ -178,6 +275,38 @@ static void process_buffer(struct synth_t *s, char *buf, ssize_t length)
 	}
 }
 
+static void process_buffer_acsint(struct synth_t *s, char *buf,
+								  ssize_t length)
+{
+	int start = 0;
+	int i;
+	int flushIt = 0;
+
+	while (start < length) {
+		for (i = start; i < length; i++) {
+			if (buf[i] == '\r' || buf[i] == '\n')
+				flushIt = 1;
+			if (buf[i] >= 0 && buf[i] < ' ')
+				break;
+		}
+		if (i > start)
+			stringAndBytes(&textAccumulator, &textAccumulator_l,
+						   buf + start, i - start);
+		if (flushIt) {
+			if (textAccumulator != EMPTYSTRING) {
+				queue_add_text(textAccumulator, textAccumulator_l);
+				free(textAccumulator);
+				textAccumulator = initString(&textAccumulator_l);
+			}
+			flushIt = 0;
+		}
+		if (i < length)
+			start = i = i + process_command(s, buf, i);
+		else
+			start = length;
+	}
+}
+
 static void request_espeak_stop(void)
 {
 	pthread_mutex_lock(&queue_guard);
@@ -191,6 +320,12 @@ static void request_espeak_stop(void)
 int open_softsynth(void)
 {
 	int rc = 0;
+	/* If we're in acsint mode, we read from stdin.  No need to open. */
+	if (espeakup_mode == ESPEAKUP_MODE_ACSINT) {
+		softFD = STDIN_FILENO;
+		return 0;
+	}
+
 	/* open the softsynth. */
 	softFD = open("/dev/softsynth", O_RDWR | O_NONBLOCK);
 	if (softFD < 0) {
@@ -216,6 +351,8 @@ void *softsynth_thread(void *arg)
 	int terminalFD = PIPE_READ_FD;
 	int greatestFD;
 
+	textAccumulator = initString(&textAccumulator_l);
+
 	if (terminalFD > softFD)
 		greatestFD = terminalFD;
 	else
@@ -264,7 +401,10 @@ void *softsynth_thread(void *arg)
 			memmove(buf, cp + 1, strlen(cp + 1) + 1);
 			length = strlen(buf);
 		}
-		process_buffer(s, buf, length);
+		if (espeakup_mode == ESPEAKUP_MODE_SPEAKUP)
+			process_buffer(s, buf, length);
+		else
+			process_buffer_acsint(s, buf, length);
 		pthread_mutex_lock(&queue_guard);
 	}
 	pthread_cond_signal(&runner_awake);