diff --git a/PDP10/kx10_cpu.c b/PDP10/kx10_cpu.c
index 11042363..d23ddb14 100644
--- a/PDP10/kx10_cpu.c
+++ b/PDP10/kx10_cpu.c
@@ -400,7 +400,7 @@ REG cpu_reg[] = {
     { ORDATAD (FAULT_ADDR, fault_addr, 18, "Fault address"), REG_RO},
     { ORDATAD (OPC, opc, 36, "Saved PC and flags")},
     { ORDATAD (MAR, mar, 18, "Memory address register")},
-    { ORDATAD (QUA_TIME, qua_time, 36, "Quantum timer"), REG_RO},
+    { ORDATAD (QUA_TIME, qua_time, 32, "Quantum timer"), REG_RO},
 #endif
     { NULL }
     };
diff --git a/PDP10/kx10_mt.c b/PDP10/kx10_mt.c
index 4f03da3d..3c0fbc28 100644
--- a/PDP10/kx10_mt.c
+++ b/PDP10/kx10_mt.c
@@ -197,7 +197,7 @@ MTAB                mt_mod[] = {
 };
 
 REG                 mt_reg[] = {
-    {BRDATA(BUFF, &mt_buffer[0], 16, 64, BUFFSIZE), REG_HRO},
+    {BRDATA(BUFF, &mt_buffer[0], 16, 8, BUFFSIZE), REG_HRO},
     {ORDATA(PIA, mt_pia, 3)},
     {ORDATA(UNIT, mt_sel_unit, 3)},
     {ORDATA(NUNIT, mt_next_unit, 3)},
diff --git a/PDP10/kx10_tu.c b/PDP10/kx10_tu.c
index ae7d1de8..d22ab75a 100644
--- a/PDP10/kx10_tu.c
+++ b/PDP10/kx10_tu.c
@@ -290,7 +290,7 @@ REG                 tua_reg[] = {
     {ORDATA(BUF, tu_df10[0].buf, 36), REG_HRO},
     {ORDATA(NXM, tu_df10[0].nxmerr, 8), REG_HRO},
     {ORDATA(COMP, tu_df10[0].ccw_comp, 8), REG_HRO},
-    {BRDATA(BUFF, &tu_buf[0][0], 16, 64, TU_NUMFR), REG_HRO},
+    {BRDATA(BUFF, &tu_buf[0][0], 16, 8, TU_NUMFR), REG_HRO},
     {0}
 };