diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
index 89def1421f..8ba07f8756 100644
--- a/hw/scsi/lsi53c895a.c
+++ b/hw/scsi/lsi53c895a.c
@@ -160,6 +160,11 @@ static const char *names[] = {
 #define LSI_CCNTL1_DDAC      0x08
 #define LSI_CCNTL1_ZMOD      0x80
 
+#define LSI_SBCL_ATN         0x08
+#define LSI_SBCL_BSY         0x20
+#define LSI_SBCL_ACK         0x40
+#define LSI_SBCL_REQ         0x80
+
 /* Enable Response to Reselection */
 #define LSI_SCID_RRE      0x60
 
@@ -258,6 +263,7 @@ typedef struct {
     uint8_t sdid;
     uint8_t ssid;
     uint8_t sfbr;
+    uint8_t sbcl;
     uint8_t stest1;
     uint8_t stest2;
     uint8_t stest3;
@@ -356,6 +362,7 @@ static void lsi_soft_reset(LSIState *s)
     s->socl = 0;
     s->sdid = 0;
     s->ssid = 0;
+    s->sbcl = 0;
     s->stest1 = 0;
     s->stest2 = 0;
     s->stest3 = 0;
@@ -530,6 +537,8 @@ static void lsi_script_dma_interrupt(LSIState *s, int stat)
 
 static inline void lsi_set_phase(LSIState *s, int phase)
 {
+    s->sbcl &= ~PHASE_MASK;
+    s->sbcl |= phase | LSI_SBCL_REQ;
     s->sstat1 = (s->sstat1 & ~PHASE_MASK) | phase;
 }
 
@@ -567,6 +576,7 @@ static void lsi_disconnect(LSIState *s)
 {
     s->scntl1 &= ~LSI_SCNTL1_CON;
     s->sstat1 &= ~PHASE_MASK;
+    s->sbcl = 0;
 }
 
 static void lsi_bad_selection(LSIState *s, uint32_t id)
@@ -1265,7 +1275,9 @@ again:
                 s->scntl1 |= LSI_SCNTL1_CON;
                 if (insn & (1 << 3)) {
                     s->socl |= LSI_SOCL_ATN;
+                    s->sbcl |= LSI_SBCL_ATN;
                 }
+                s->sbcl |= LSI_SBCL_BSY;
                 lsi_set_phase(s, PHASE_MO);
                 break;
             case 1: /* Disconnect */
@@ -1297,8 +1309,14 @@ again:
                         insn & (1 << 10) ? " CC" : "");
                 if (insn & (1 << 3)) {
                     s->socl |= LSI_SOCL_ATN;
+                    s->sbcl |= LSI_SBCL_ATN;
                     lsi_set_phase(s, PHASE_MO);
                 }
+
+                if (insn & (1 << 6)) {
+                    s->sbcl |= LSI_SBCL_ACK;
+                }
+
                 if (insn & (1 << 9)) {
                     qemu_log_mask(LOG_UNIMP,
                         "lsi_scsi: Target mode not implemented\n");
@@ -1314,7 +1332,13 @@ again:
                         insn & (1 << 10) ? " CC" : "");
                 if (insn & (1 << 3)) {
                     s->socl &= ~LSI_SOCL_ATN;
+                    s->sbcl &= ~LSI_SBCL_ATN;
                 }
+
+                if (insn & (1 << 6)) {
+                    s->sbcl &= ~LSI_SBCL_ACK;
+                }
+
                 if (insn & (1 << 10))
                     s->carry = 0;
                 break;
@@ -1591,9 +1615,7 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset)
         ret = s->ssid;
         break;
     case 0xb: /* SBCL */
-        /* ??? This is not correct. However it's (hopefully) only
-           used for diagnostics, so should be ok.  */
-        ret = 0;
+        ret = s->sbcl;
         break;
     case 0xc: /* DSTAT */
         ret = s->dstat | LSI_DSTAT_DFE;
@@ -2143,7 +2165,7 @@ static int lsi_post_load(void *opaque, int version_id)
 
 static const VMStateDescription vmstate_lsi_scsi = {
     .name = "lsiscsi",
-    .version_id = 0,
+    .version_id = 1,
     .minimum_version_id = 0,
     .pre_save = lsi_pre_save,
     .post_load = lsi_post_load,
@@ -2202,6 +2224,7 @@ static const VMStateDescription vmstate_lsi_scsi = {
         VMSTATE_UINT8(stime0, LSIState),
         VMSTATE_UINT8(respid0, LSIState),
         VMSTATE_UINT8(respid1, LSIState),
+        VMSTATE_UINT8_V(sbcl, LSIState, 1),
         VMSTATE_UINT32(mmrs, LSIState),
         VMSTATE_UINT32(mmws, LSIState),
         VMSTATE_UINT32(sfs, LSIState),