diff --git a/src/dev/testDev/devLoTestAsyn.c b/src/dev/testDev/devLoTestAsyn.c
new file mode 100644
index 000000000..8f3309157
--- /dev/null
+++ b/src/dev/testDev/devLoTestAsyn.c
@@ -0,0 +1,105 @@
+/*************************************************************************\
+* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE Versions 3.13.7
+* and higher are distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+/* devLoTestAsyn.c */
+
+/* devLoTestAsyn.c - Device Support Routines for testing asynchronous processing*/
+/*
+ *      Author:  Marty Kraimer
+ *      Date:    06NOV2003
+ */
+
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "alarm.h"
+#include "callback.h"
+#include "cvtTable.h"
+#include "dbDefs.h"
+#include "dbAccess.h"
+#include "recGbl.h"
+#include "recSup.h"
+#include "devSup.h"
+#include "link.h"
+#include "dbCommon.h"
+#include "longoutRecord.h"
+#include "epicsExport.h"
+
+/* Create the dset for devLoTestAsyn */
+static long init_record();
+static long write_lo();
+struct {
+	long		number;
+	DEVSUPFUN	report;
+	DEVSUPFUN	init;
+	DEVSUPFUN	init_record;
+	DEVSUPFUN	get_ioint_info;
+	DEVSUPFUN	write_lo;
+	DEVSUPFUN	special_linconv;
+}devLoTestAsyn={
+	6,
+	NULL,
+	NULL,
+	init_record,
+	NULL,
+	write_lo,
+	NULL
+};
+epicsExportAddress(dset,devLoTestAsyn);
+
+static long init_record(struct longoutRecord	*plo)
+{
+    CALLBACK *pcallback;
+
+    /* ao.out must be a CONSTANT*/
+    switch (plo->out.type) {
+    case (CONSTANT) :
+	pcallback = (CALLBACK *)(calloc(1,sizeof(CALLBACK)));
+	plo->dpvt = (void *)pcallback;
+	break;
+    default :
+	recGblRecordError(S_db_badField,(void *)plo,
+		"devLoTestAsyn (init_record) Illegal OUT field");
+	plo->pact=TRUE;
+	return(S_db_badField);
+    }
+    return(2);
+}
+
+static long write_lo(longoutRecord *plo)
+{
+    CALLBACK *pcallback=(CALLBACK *)(plo->dpvt);
+
+    /* ao.out must be a CONSTANT*/
+    switch (plo->out.type) {
+    case (CONSTANT) :
+	if(plo->pact) {
+		printf("Completed asynchronous processing: %s\n",plo->name);
+		return(0);
+	} else {
+                if(plo->disv<=0) return(0);
+		printf("Starting asynchronous processing: %s\n",plo->name);
+		plo->pact=TRUE;
+                callbackRequestProcessCallbackDelayed(
+                    pcallback,plo->prio,plo,(double)plo->disv);
+		return(0);
+	}
+    default :
+        if(recGblSetSevr(plo,SOFT_ALARM,INVALID_ALARM)){
+		if(plo->stat!=SOFT_ALARM) {
+			recGblRecordError(S_db_badField,(void *)plo,
+			   "devLoTestAsyn (write_lo) Illegal OUT field");
+		}
+	}
+    }
+    return(0);
+}
diff --git a/src/dev/testDev/devMbboDirectTestAsyn.c b/src/dev/testDev/devMbboDirectTestAsyn.c
new file mode 100644
index 000000000..3ecabb17b
--- /dev/null
+++ b/src/dev/testDev/devMbboDirectTestAsyn.c
@@ -0,0 +1,108 @@
+/*************************************************************************\
+* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE Versions 3.13.7
+* and higher are distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+/* devMbboDirectTestAsyn.c */
+/* base/src/dev $Id$ */
+
+/* devMbboDirectTestAsyn.c - Device Support Routines for testing asynchronous processing*/
+/*
+ *      Author:  Marty Kraimer
+ *      Date:    06NOV2003
+ */
+
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "alarm.h"
+#include "callback.h"
+#include "cvtTable.h"
+#include "dbDefs.h"
+#include "dbAccess.h"
+#include "recGbl.h"
+#include "recSup.h"
+#include "devSup.h"
+#include "link.h"
+#include "dbCommon.h"
+#include "mbboRecord.h"
+#include "epicsExport.h"
+
+/* Create the dset for devMbboDirectTestAsyn */
+static long init_record();
+static long write_mbbo();
+struct {
+	long		number;
+	DEVSUPFUN	report;
+	DEVSUPFUN	init;
+	DEVSUPFUN	init_record;
+	DEVSUPFUN	get_ioint_info;
+	DEVSUPFUN	write_mbbo;
+	DEVSUPFUN	special_linconv;
+}devMbboDirectTestAsyn={
+	6,
+	NULL,
+	NULL,
+	init_record,
+	NULL,
+	write_mbbo,
+	NULL
+};
+epicsExportAddress(dset,devMbboDirectTestAsyn);
+
+static long init_record(pmbbo)
+    struct mbboRecord	*pmbbo;
+{
+    CALLBACK *pcallback;
+
+    /* mbbo.out must be a CONSTANT*/
+    switch (pmbbo->out.type) {
+    case (CONSTANT) :
+	pcallback = (CALLBACK *)(calloc(1,sizeof(CALLBACK)));
+	pmbbo->dpvt = (void *)pcallback;
+	break;
+    default :
+	recGblRecordError(S_db_badField,(void *)pmbbo,
+		"devMbboDirectTestAsyn (init_record) Illegal OUT field");
+	pmbbo->pact=TRUE;
+	return(S_db_badField);
+    }
+    return(2);
+}
+
+static long write_mbbo(pmbbo)
+    struct mbboRecord	*pmbbo;
+{
+    CALLBACK *pcallback=(CALLBACK *)(pmbbo->dpvt);
+
+    /* mbbo.out must be a CONSTANT*/
+    switch (pmbbo->out.type) {
+    case (CONSTANT) :
+	if(pmbbo->pact) {
+		printf("Completed asynchronous processing: %s\n",pmbbo->name);
+		return(0);
+	} else {
+                if(pmbbo->disv<=0) return(0);
+		printf("Starting asynchronous processing: %s\n",pmbbo->name);
+		pmbbo->pact=TRUE;
+                callbackRequestProcessCallbackDelayed(
+                    pcallback,pmbbo->prio,pmbbo,(double)pmbbo->disv);
+		return(0);
+	}
+    default :
+        if(recGblSetSevr(pmbbo,SOFT_ALARM,INVALID_ALARM)){
+		if(pmbbo->stat!=SOFT_ALARM) {
+			recGblRecordError(S_db_badField,(void *)pmbbo,
+			   "devMbboDirectTestAsyn (write_mbbo) Illegal OUT field");
+		}
+	}
+    }
+    return(0);
+}