diff --git a/10.01_base/2_src/arm/unibusdevice.cpp b/10.01_base/2_src/arm/unibusdevice.cpp
index f4e1d59..444bebf 100644
--- a/10.01_base/2_src/arm/unibusdevice.cpp
+++ b/10.01_base/2_src/arm/unibusdevice.cpp
@@ -269,7 +269,7 @@ char *unibusdevice_c::get_unibus_resource_info(void) {
 		slot_to = std::max(slot_to, (*it)->get_priority_slot());
 	}
 
-	if (slot_from > slot_to) // no requests: use devcie parameter
+	if (slot_from > slot_to) // no requests: use device parameter
 		slot_from = slot_to = priority_slot.value;
 	if (slot_from == slot_to)
 		sprintf(tmpbuff, ", slot %u", (unsigned) slot_from);
diff --git a/10.01_base/2_src/pru1/pru1_main_unibus.c b/10.01_base/2_src/pru1/pru1_main_unibus.c
index 8140c26..09d5fab 100644
--- a/10.01_base/2_src/pru1/pru1_main_unibus.c
+++ b/10.01_base/2_src/pru1/pru1_main_unibus.c
@@ -159,8 +159,9 @@ void main(void) {
 					// "set" is inverting!
 					cpu_grant_mask = buslatches_getbyte(0) & PRIORITY_ARBITRATION_BIT_MASK; // read GRANT IN
 					// forward un-requested GRANT IN to GRANT OUT for other cards on neighbor slots
-					buslatches_setbits(0, PRIORITY_ARBITRATION_BIT_MASK & ~sm_arb.device_request_mask, ~cpu_grant_mask)
-					;
+					uint8_t grant_out_mask = cpu_grant_mask & ~sm_arb.device_request_mask ; 
+					buslatches_setbits(0, PRIORITY_ARBITRATION_BIT_MASK, ~grant_out_mask)
+				;
 				}
 				// handle GRANT/SACK/BBSY for emulated devices
 				uint8_t granted_request = sm_device_arb_worker(cpu_grant_mask); // devices process GRANT
diff --git a/10.01_base/2_src/pru1/pru1_statemachine_arbitration.c b/10.01_base/2_src/pru1/pru1_statemachine_arbitration.c
index a9890c8..3c55511 100644
--- a/10.01_base/2_src/pru1/pru1_statemachine_arbitration.c
+++ b/10.01_base/2_src/pru1/pru1_statemachine_arbitration.c
@@ -271,7 +271,7 @@ uint8_t sm_arb_worker_cpu() {
 		timeout_cleanup(TIMEOUT_SACK);
 	}
 	// put the single BR/NPR GRANT onto GRANT OUT BUS line, latches inverted.
-	// visible for physical devices, not for emulated devcies on this UniBone
+	// visible for physical devices, not for emulated devices on this UniBone
 	buslatches_setbits(0, PRIORITY_ARBITRATION_BIT_MASK, ~sm_arb.arbitrator_grant_mask )
 	;
 
diff --git a/10.01_base/2_src/pru1/pru1_statemachine_data_slave.c b/10.01_base/2_src/pru1/pru1_statemachine_data_slave.c
index 2f0c691..4509023 100644
--- a/10.01_base/2_src/pru1/pru1_statemachine_data_slave.c
+++ b/10.01_base/2_src/pru1/pru1_statemachine_data_slave.c
@@ -83,11 +83,7 @@ statemachine_state_func sm_data_slave_start() {
 	// addr8..15 = latch[3]
 	// addr 16,17 = latch[4].0,1
 	addr = latch2val | ((uint32_t) latch3val << 8) | ((uint32_t) (latch4val & 3) << 16);
-//if (addr == 01046) // trigger address
-//  PRU_DEBUG_PIN0(1) ; // trigger to LA.
-
 	
-
 	// make bool of a17..a13. iopage, if a17..a13 all 1's
 	// iopage = ((latch3val & 0xe0) | (latch4val & 3)) == 0xe3;
 	// 2 statements above = 12 cycles = 60ns
@@ -98,6 +94,12 @@ statemachine_state_func sm_data_slave_start() {
 	// !!! Attention: on fast UNIBUS cycles to other devices,
 	// !!! SSYN may already be asserted. Or MSYN may even be inactive again !!!
 
+//	if (addr == 0 && control == UNIBUS_CONTROL_DATI) // trigger address, after boot
+//	  PRU_DEBUG_PIN0(1) ; // trigger to LA.
+//if (addr >= 0777560 && addr <= 0777566) // trigger address, after boot
+//	PRU_DEBUG_PIN0(1) ; // trigger to LA.
+
+
 	// page_table_entry = PAGE_TABLE_ENTRY(deviceregisters,addr) ; // is addr ignored,memory,iopage?
 //	if (addr >= 0x8000 && addr < 0x10000)
 //		page_table_entry = PAGE_MEMORY ;
diff --git a/10.01_base/2_src/shared/unibus.h b/10.01_base/2_src/shared/unibus.h
index 971371b..6352793 100644
--- a/10.01_base/2_src/shared/unibus.h
+++ b/10.01_base/2_src/shared/unibus.h
@@ -74,7 +74,7 @@ private:
 
 	// false: no running CPU on UNIBUS (physical or emulated)
 	// 	devices do DMA without NPR/NPG protocol
-	// true:  active CPU. devcies pus perform Request/Grant/SACK protocoll
+	// true:  active CPU. devices perform Request/Grant/SACK protocoll
 	bool arbitrator_active;
 
 public:
diff --git a/10.02_devices/2_src/uda.cpp b/10.02_devices/2_src/uda.cpp
index dd882e1..d720fe1 100644
--- a/10.02_devices/2_src/uda.cpp
+++ b/10.02_devices/2_src/uda.cpp
@@ -966,6 +966,8 @@ uda_c::DMAWrite(
     uint8_t* buffer)
 {
     assert ((lengthInBytes % 2) == 0);
+//    if (address >= 0x40000)
+//    	logger->dump(logger->default_filepath) ;
     assert (address < 0x40000);
 
     unibusadapter->DMA(dma_request, true,
diff --git a/10.03_app_demo/2_src/menus.cpp b/10.03_app_demo/2_src/menus.cpp
index 62dc3fd..155d278 100644
--- a/10.03_app_demo/2_src/menus.cpp
+++ b/10.03_app_demo/2_src/menus.cpp
@@ -102,7 +102,7 @@ bool application_c::parse_slot(char *txt, uint8_t *priority_slot) {
 
 void application_c::print_arbitration_info(const char *indent) {
 	if (unibus->get_arbitrator_active()) {
-		printf("%s\"UniBone devcies are clients to PDP-11 CPU doing NPR/INTR Arbitrator\n",
+		printf("%s\"UniBone devices are clients to PDP-11 CPU doing NPR/INTR Arbitrator\n",
 				indent);
 		printf("%s(CPU active, console processor inactive).\n", indent);
 		printf("%sCPU is physical or emulated.\n", indent);
diff --git a/10.03_app_demo/5_applications/211bsd.mscp/2.11BSD_du_44.cmd b/10.03_app_demo/5_applications/211bsd.mscp/2.11BSD_du_44.cmd
index eb599a0..5103e4d 100644
--- a/10.03_app_demo/5_applications/211bsd.mscp/2.11BSD_du_44.cmd
+++ b/10.03_app_demo/5_applications/211bsd.mscp/2.11BSD_du_44.cmd
@@ -8,11 +8,14 @@ m i			# install max UNIBUS memory
 # Deposit bootloader into memory
 m ll du.lst
 
+en uda			# enable UDA50 controller
+
 # mount 2.11bSD in drive #0 and start
+en uda0			# enable drive #0
 sd uda0			# select drive #0
 
-p type RA72
-p image 2.11BSD_44.ra72 # mount image file with test pattern
+p type RA92
+p image 2.11BSD_44.ra92 # mount image file with test pattern
 
 .print MSCP drives ready.
 .print UDA50 boot loader installed.
diff --git a/10.03_app_demo/5_applications/211bsd.mscp/211bsd_44.simh_pdp11 b/10.03_app_demo/5_applications/211bsd.mscp/211bsd_44.simh_pdp11
index bebb821..0217e8b 100644
--- a/10.03_app_demo/5_applications/211bsd.mscp/211bsd_44.simh_pdp11
+++ b/10.03_app_demo/5_applications/211bsd.mscp/211bsd_44.simh_pdp11
@@ -1,3 +1,5 @@
+; after  http://www.vaxman.de/publications/bsd211_inst.pdf
+
 ; model a PDP-11/44 with maximum memory, fpu, no CIS
 set cpu 11/44 4096K fpp nocis
 
@@ -11,7 +13,6 @@ set rp disabled
 set rk disabled
 set xu disabled
 set xq disabled
-set rl disabled
 set rx disabled
 set tm disabled
 set ts disabled
@@ -23,8 +24,12 @@ set tto 7b
 
 ; set the boot disk as a 1GB RA72 on an MSCP UDA50
 set rq enabled
-set rq0 ra72
-attach rq0 2.11BSD_44.ra72
+set rq0 ra92
+attach rq0 2.11BSD_44.ra92
+
+; boot tape
+set ts enable
+attach ts 211bsd.tap
 
 ; set one DZ11 8 line async mux
 ; accessible via telnet to 127.0.0.1:4000...4007
@@ -37,7 +42,7 @@ attach -am dz 4000
 ; set one DELUA/DEUNA unibus enet controller
 ; ==> must setup eth0/eth1 per your system config
 set xu enabled
-set xu type=deuna
+set xu type=delua
 attach xu eth0
 
 ; enable one tape device on a TMSCP controller
@@ -46,6 +51,5 @@ set tq enabled
 ; show our config
 show devices
 
-set cons telnet=23
-; boot it
+; set cons telnet=23
 boot rq0