diff --git a/sys/dev/buslogic/bt.c b/sys/dev/buslogic/bt.c
index 5eed00057c5..b0df0cee110 100644
--- a/sys/dev/buslogic/bt.c
+++ b/sys/dev/buslogic/bt.c
@@ -492,12 +492,18 @@ bt_fetch_adapter_info(device_t dev)
 	
   	bt->bios_addr = esetup_info.bios_addr << 12;
 
+	bt->mailbox_addrlimit = BUS_SPACE_MAXADDR;
 	if (esetup_info.bus_type == 'A'
 	 && bt->firmware_ver[0] == '2') {
 		snprintf(bt->model, sizeof(bt->model), "542B");
 	} else if (esetup_info.bus_type == 'E'
-		&& (strncmp(bt->firmware_ver, "2.1", 3) == 0
-		 || strncmp(bt->firmware_ver, "2.20", 4) == 0)) {
+	 	&& bt->firmware_ver[0] == '2') {
+
+		/*
+		 * The 742A seems to object if its mailboxes are
+		 * allocated above the 16MB mark.
+		 */
+		bt->mailbox_addrlimit = BUS_SPACE_MAXADDR_24BIT;
 		snprintf(bt->model, sizeof(bt->model), "742A");
 	} else if (esetup_info.bus_type == 'E'
 		&& bt->firmware_ver[0] == '0') {
@@ -720,7 +726,7 @@ bt_init(device_t dev)
 	bt->init_level++;
 	/* DMA tag for our mailboxes */
 	if (bus_dma_tag_create(bt->parent_dmat, /*alignment*/1, /*boundary*/0,
-			       /*lowaddr*/BUS_SPACE_MAXADDR,
+			       /*lowaddr*/bt->mailbox_addrlimit,
 			       /*highaddr*/BUS_SPACE_MAXADDR,
 			       /*filter*/NULL, /*filterarg*/NULL,
 			       bt->num_boxes * (sizeof(bt_mbox_in_t)
diff --git a/sys/dev/buslogic/bt_eisa.c b/sys/dev/buslogic/bt_eisa.c
index 8504ab124b3..dc4d651376d 100644
--- a/sys/dev/buslogic/bt_eisa.c
+++ b/sys/dev/buslogic/bt_eisa.c
@@ -46,7 +46,10 @@
 
 #define EISA_DEVICE_ID_BUSLOGIC_74X_B	0x0ab34201
 #define EISA_DEVICE_ID_BUSLOGIC_74X_C	0x0ab34202
+#define EISA_DEVICE_ID_SDC3222B		0x0ab34281
 #define EISA_DEVICE_ID_SDC3222F		0x0ab34781
+#define EISA_DEVICE_ID_SDC3222WS	0x0ab34981
+#define EISA_DEVICE_ID_SDC3222WB	0x0ab34982
 #define	EISA_DEVICE_ID_AMI_4801		0x05a94801
 
 #define BT_IOSIZE		0x04		/* Move to central header */
@@ -163,9 +166,18 @@ bt_match(eisa_id_t type)
 		case EISA_DEVICE_ID_BUSLOGIC_74X_C:
 			return ("Buslogic 74xC SCSI host adapter");
 			break;
+		case EISA_DEVICE_ID_SDC3222B:
+			return ("Storage Dimensions SDC3222B SCSI host adapter");
+			break;
 		case EISA_DEVICE_ID_SDC3222F:
 			return ("Storage Dimensions SDC3222F SCSI host adapter");
 			break;
+		case EISA_DEVICE_ID_SDC3222WS:
+			return ("Storage Dimensions SDC3222WS SCSI host adapter");
+			break;
+		case EISA_DEVICE_ID_SDC3222WB:
+			return ("Storage Dimensions SDC3222WB SCSI host adapter");
+			break;
 		case EISA_DEVICE_ID_AMI_4801:
 			return ("AMI Series 48 SCSI host adapter");
 			break;
diff --git a/sys/dev/buslogic/btreg.h b/sys/dev/buslogic/btreg.h
index 10c9bd56928..61491c6275f 100644
--- a/sys/dev/buslogic/btreg.h
+++ b/sys/dev/buslogic/btreg.h
@@ -633,6 +633,7 @@ struct bt_softc {
 	bus_dmamap_t		 sense_dmamap;
 	SLIST_HEAD(, sg_map_node) sg_maps;
 	bus_addr_t		 mailbox_physbase;
+	bus_addr_t		 mailbox_addrlimit;
 	u_int			 num_ccbs;	/* Number of CCBs malloc'd */
 	u_int			 max_ccbs;	/* Maximum allocatable CCBs */
 	u_int			 max_sg;