diff --git a/src/devices/cpu/i86/i186.cpp b/src/devices/cpu/i86/i186.cpp
index da0359e649b..4ed045460d1 100644
--- a/src/devices/cpu/i86/i186.cpp
+++ b/src/devices/cpu/i86/i186.cpp
@@ -271,7 +271,7 @@ void i80186_cpu_device::execute_run()
 					if (tmp<low || tmp>high)
 						interrupt(5);
 					CLK(BOUND);
-					logerror("%s: %06x: bound %04x high %04x low %04x tmp\n", tag(), pc(), high, low, tmp);
+					logerror("%06x: bound %04x high %04x low %04x tmp\n", pc(), high, low, tmp);
 				}
 				break;
 
@@ -342,7 +342,7 @@ void i80186_cpu_device::execute_run()
 					m_sregs[DS] = m_src;
 					break;
 				default:
-					logerror("%s: %06x: Mov Sreg - Invalid register\n", tag(), pc());
+					logerror("%06x: Mov Sreg - Invalid register\n", pc());
 					m_ip = m_prev_ip;
 					interrupt(6);
 					break;
@@ -538,7 +538,7 @@ void i80186_cpu_device::execute_run()
 				if(!common_op(op))
 				{
 					m_icount -= 10; // UD fault timing?
-					logerror("%s: %06x: Invalid Opcode %02x\n", tag(), pc(), op);
+					logerror("%06x: Invalid Opcode %02x\n", pc(), op);
 					m_ip = m_prev_ip;
 					interrupt(6); // 80186 has #UD
 					break;
diff --git a/src/devices/cpu/i86/i286.cpp b/src/devices/cpu/i86/i286.cpp
index f28438853ea..1cb06fd0298 100644
--- a/src/devices/cpu/i86/i286.cpp
+++ b/src/devices/cpu/i86/i286.cpp
@@ -1412,7 +1412,7 @@ reg.base = BASE(desc); (void)(r); reg.limit = LIMIT(desc); }
 					if (tmp<low || tmp>high)
 						interrupt(5);
 					CLK(BOUND);
-					logerror("%s: %06x: bound %04x high %04x low %04x tmp\n", tag(), pc(), high, low, tmp);
+					logerror("%06x: bound %04x high %04x low %04x tmp\n", pc(), high, low, tmp);
 				}
 				break;
 
@@ -1489,7 +1489,7 @@ reg.base = BASE(desc); (void)(r); reg.limit = LIMIT(desc); }
 					m_modrm = fetch();
 					if((m_modrm & 0x38) > 0x18)
 					{
-						logerror("%s: %06x: Mov Sreg - Invalid register\n", tag(), pc());
+						logerror("%06x: Mov Sreg - Invalid register\n", pc());
 						throw TRAP(FAULT_UD, (uint16_t)-1);
 					}
 					PutRMWord(m_sregs[(m_modrm & 0x38) >> 3]);
@@ -1513,7 +1513,7 @@ reg.base = BASE(desc); (void)(r); reg.limit = LIMIT(desc); }
 							data_descriptor(DS, m_src);
 							break;
 						default:
-							logerror("%s: %06x: Mov Sreg - Invalid register\n", tag(), pc());
+							logerror("%06x: Mov Sreg - Invalid register\n", pc());
 							throw TRAP(FAULT_UD, (uint16_t)-1);
 					}
 					break;
@@ -1776,7 +1776,7 @@ reg.base = BASE(desc); (void)(r); reg.limit = LIMIT(desc); }
 				case 0xf0: // i_lock
 					if(PM && (CPL > m_IOPL))
 						throw TRAP(FAULT_GP, 0);
-					logerror("%s: %06x: Warning - BUSLOCK\n", tag(), pc());
+					logerror("%06x: Warning - BUSLOCK\n", pc());
 					m_no_interrupt = 1;
 					CLK(NOP);
 					break;
@@ -1853,7 +1853,7 @@ reg.base = BASE(desc); (void)(r); reg.limit = LIMIT(desc); }
 							CLKM(PUSH_R16,PUSH_M16);
 							break;
 						default:
-							logerror("%s: %06x: FF Pre with unimplemented mod\n", tag(), pc());
+							logerror("%06x: FF Pre with unimplemented mod\n", pc());
 							throw TRAP(FAULT_UD,(uint16_t)-1);
 						}
 					}
@@ -1889,7 +1889,7 @@ reg.base = BASE(desc); (void)(r); reg.limit = LIMIT(desc); }
 					if(!common_op(op))
 					{
 						m_icount -= 10; // UD fault timing?
-						logerror("%s: %06x: Invalid Opcode %02x\n", tag(), pc(), op);
+						logerror("%06x: Invalid Opcode %02x\n", pc(), op);
 						m_ip = m_prev_ip;
 						throw TRAP(FAULT_UD, (uint16_t)-1);
 					}
diff --git a/src/devices/cpu/i86/i86.cpp b/src/devices/cpu/i86/i86.cpp
index b0076d210ef..ad3efd8a46c 100644
--- a/src/devices/cpu/i86/i86.cpp
+++ b/src/devices/cpu/i86/i86.cpp
@@ -256,7 +256,7 @@ void i8086_cpu_device::execute_run()
 				if(!common_op(op))
 				{
 					m_icount -= 10;
-					logerror("%s: %06x: Invalid Opcode %02x\n", tag(), pc(), op);
+					logerror("%06x: Invalid Opcode %02x\n", pc(), op);
 					break;
 				}
 				break;
@@ -1884,7 +1884,7 @@ bool i8086_common_cpu_device::common_op(uint8_t op)
 			m_modrm = fetch();
 			GetRMByte();
 			CLK(NOP);
-			logerror("%s: %06x: Unimplemented floating point escape %02x%02x\n", tag(), pc(), op, m_modrm);
+			logerror("%06x: Unimplemented floating point escape %02x%02x\n", pc(), op, m_modrm);
 			break;
 
 
@@ -2051,7 +2051,7 @@ bool i8086_common_cpu_device::common_op(uint8_t op)
 
 		case 0xf0: // i_lock
 		case 0xf1: // 0xf1 is 0xf0; verified on real CPU
-			logerror("%s: %06x: Warning - BUSLOCK\n", tag(), pc());
+			logerror("%06x: Warning - BUSLOCK\n", pc());
 			m_lock = true;
 			m_no_interrupt = 1;
 			CLK(NOP);
@@ -2076,7 +2076,7 @@ bool i8086_common_cpu_device::common_op(uint8_t op)
 				case 0xae:  CLK(OVERRIDE); if (c) do { i_scasb(); c--; } while (c>0 && !ZF && m_icount>0);   m_regs.w[CX]=c; m_seg_prefix = false; m_seg_prefix_next = false; break;
 				case 0xaf:  CLK(OVERRIDE); if (c) do { i_scasw(); c--; } while (c>0 && !ZF && m_icount>0);   m_regs.w[CX]=c; m_seg_prefix = false; m_seg_prefix_next = false; break;
 				default:
-					logerror("%s: %06x: REPNE invalid\n", tag(), pc());
+					logerror("%06x: REPNE invalid\n", pc());
 					// Decrement IP so the normal instruction will be executed next
 					m_ip--;
 					invalid = true;
@@ -2109,7 +2109,7 @@ bool i8086_common_cpu_device::common_op(uint8_t op)
 				case 0xae:  CLK(OVERRIDE); if (c) do { i_scasb(); c--; } while (c>0 && ZF && m_icount>0);    m_regs.w[CX]=c; m_seg_prefix = false; m_seg_prefix_next = false; break;
 				case 0xaf:  CLK(OVERRIDE); if (c) do { i_scasw(); c--; } while (c>0 && ZF && m_icount>0);    m_regs.w[CX]=c; m_seg_prefix = false; m_seg_prefix_next = false; break;
 				default:
-					logerror("%s: %06x: REPE invalid\n", tag(), pc());
+					logerror("%06x: REPE invalid\n", pc());
 					// Decrement IP so the normal instruction will be executed next
 					m_ip--;
 					invalid = true;
@@ -2369,7 +2369,7 @@ bool i8086_common_cpu_device::common_op(uint8_t op)
 					CLKM(INCDEC_R8,INCDEC_M8);
 					break;
 				default:
-					logerror("%s: %06x: FE Pre with unimplemented mod\n", tag(), pc());
+					logerror("%06x: FE Pre with unimplemented mod\n", pc());
 					break;
 				}
 			}
@@ -2425,7 +2425,7 @@ bool i8086_common_cpu_device::common_op(uint8_t op)
 					CLKM(PUSH_R16,PUSH_M16);
 					break;
 				default:
-					logerror("%s: %06x: FF Pre with unimplemented mod\n", tag(), pc());
+					logerror("%06x: FF Pre with unimplemented mod\n", pc());
 					break;
 				}
 			}
diff --git a/src/devices/cpu/z80/z80.cpp b/src/devices/cpu/z80/z80.cpp
index cb8c0ecc8ed..cb0848bda9c 100644
--- a/src/devices/cpu/z80/z80.cpp
+++ b/src/devices/cpu/z80/z80.cpp
@@ -631,8 +631,8 @@ inline void z80_device::ret_cond(bool cond, uint8_t opcode)
  ***************************************************************/
 inline void z80_device::retn()
 {
-	LOG(("Z80 '%s' RETN m_iff1:%d m_iff2:%d\n",
-		tag(), m_iff1, m_iff2));
+	LOG(("Z80 RETN m_iff1:%d m_iff2:%d\n",
+		m_iff1, m_iff2));
 	pop(m_pc);
 	WZ = PC;
 	m_iff1 = m_iff2;
@@ -2536,8 +2536,8 @@ OP(fd,ff) { illegal_1(); op_ff();                            } /* DB   FD
 
 OP(illegal,2)
 {
-	logerror("Z80 '%s' ill. opcode $ed $%02x\n",
-			tag(), m_decrypted_opcodes_direct->read_byte((PCD-1)&0xffff));
+	logerror("Z80 ill. opcode $ed $%02x\n",
+			m_decrypted_opcodes_direct->read_byte((PCD-1)&0xffff));
 }
 
 /**********************************************************
@@ -3160,7 +3160,7 @@ void z80_device::take_interrupt()
 	// fetch the IRQ vector
 	device_z80daisy_interface *intf = daisy_get_irq_device();
 	int irq_vector = (intf != nullptr) ? intf->z80daisy_irq_ack() : standard_irq_callback_member(*this, 0);
-	LOG(("Z80 '%s' single int. irq_vector $%02x\n", tag(), irq_vector));
+	LOG(("Z80 single int. irq_vector $%02x\n", irq_vector));
 
 	/* Interrupt mode 2. Call [i:databyte] */
 	if( m_im == 2 )
@@ -3171,7 +3171,7 @@ void z80_device::take_interrupt()
 		irq_vector = (irq_vector & 0xff) | (m_i << 8);
 		push(m_pc);
 		rm16(irq_vector, m_pc);
-		LOG(("Z80 '%s' IM2 [$%04x] = $%04x\n", tag(), irq_vector, PCD));
+		LOG(("Z80 IM2 [$%04x] = $%04x\n", irq_vector, PCD));
 		/* CALL opcode timing + 'interrupt latency' cycles */
 		m_icount -= m_cc_op[0xcd] + m_cc_ex[0xff];
 	}
@@ -3190,7 +3190,7 @@ void z80_device::take_interrupt()
 		/* Interrupt mode 0. We check for CALL and JP instructions, */
 		/* if neither of these were found we assume a 1 byte opcode */
 		/* was placed on the databus                                */
-		LOG(("Z80 '%s' IM0 $%04x\n", tag(), irq_vector));
+		LOG(("Z80 IM0 $%04x\n", irq_vector));
 
 		/* check for nop */
 		if (irq_vector != 0x00)
diff --git a/src/devices/imagedev/floppy.cpp b/src/devices/imagedev/floppy.cpp
index ac59c9f38cf..2e9b4e4d931 100644
--- a/src/devices/imagedev/floppy.cpp
+++ b/src/devices/imagedev/floppy.cpp
@@ -658,7 +658,7 @@ void floppy_image_device::stp_w(int state)
 			}
 			if(ocyl != cyl)
 			{
-				if (TRACE_STEP) logerror("%s: track %d\n", tag(), cyl);
+				if (TRACE_STEP) logerror("track %d\n", cyl);
 				// Do we want a stepper sound?
 				// We plan for 5 zones with possibly specific sounds
 				if (m_make_sound) m_sound_out->step(cyl*5/tracks);
@@ -706,7 +706,7 @@ void floppy_image_device::seek_phase_w(int phases)
 	subcyl = next_pos & 3;
 
 	if(TRACE_STEP && (next_pos != cur_pos))
-		logerror("%s: track %d.%d\n", tag(), cyl, subcyl);
+		logerror("track %d.%d\n", cyl, subcyl);
 
 	/* Update disk detection if applicable */
 	if (exists() && !dskchg_writable)