diff --git a/rl02.cpp b/rl02.cpp
index b39cfaf..344211f 100644
--- a/rl02.cpp
+++ b/rl02.cpp
@@ -202,7 +202,7 @@ void rl02::writeWord(const uint16_t addr, uint16_t v)
 
 			DOLOG(debug, false, "RL02 read %d bytes (dec) from %d (dec) to %06o (oct) [cylinder: %d, head: %d, sector: %d]", count, temp_disk_offset, memory_address, track, head, sector);
 
-			update_dar();
+//			update_dar();
 
 			while(count > 0) {
 				uint32_t cur = std::min(uint32_t(sizeof xfer_buffer), count);
@@ -217,9 +217,7 @@ void rl02::writeWord(const uint16_t addr, uint16_t v)
 					b->writeUnibusByte(memory_address++, xfer_buffer[i++]);
 					b->writeUnibusByte(memory_address++, xfer_buffer[i++]);
 
-					update_bus_address(memory_address);
-
-					(*reinterpret_cast<int16_t *>(&registers[(RL02_MPR - RL02_BASE) / 2]))++;
+					// update_bus_address(memory_address);
 				}
 
 				temp_disk_offset += cur;
@@ -238,12 +236,9 @@ void rl02::writeWord(const uint16_t addr, uint16_t v)
 					}
 				}
 
-				update_dar();
+//				update_dar();
 			}
 
-			if (registers[(RL02_MPR - RL02_BASE) / 2])
-				DOLOG(warning, false, "RL02: unexpected MPR value after read (%06o)", registers[(RL02_MPR - RL02_BASE) / 2]);
-
 			do_int = true;
 		}
 		else {