diff --git a/src/emu/cpu/tms32051/tms32051.c b/src/emu/cpu/tms32051/tms32051.c
index 8be185a3ffe..f668546c511 100644
--- a/src/emu/cpu/tms32051/tms32051.c
+++ b/src/emu/cpu/tms32051/tms32051.c
@@ -447,7 +447,9 @@ static READ16_HANDLER( cpuregs_r )
 		}
 
 		case 0x28:	return 0;	// PDWSR
-		default:	fatalerror("32051: cpuregs_r: unimplemented memory-mapped register %02X at %04X\n", offset, cpustate->pc-1);
+		default:
+		if(!space->debugger_access())
+			fatalerror("32051: cpuregs_r: unimplemented memory-mapped register %02X at %04X\n", offset, cpustate->pc-1);
 	}
 
 	return 0;
@@ -523,7 +525,9 @@ static WRITE16_HANDLER( cpuregs_w )
 		}
 
 		case 0x28:	break;		// PDWSR
-		default:	fatalerror("32051: cpuregs_w: unimplemented memory-mapped register %02X, data %04X at %04X\n", offset, data, cpustate->pc-1);
+		default:
+		if(!space->debugger_access())
+			fatalerror("32051: cpuregs_w: unimplemented memory-mapped register %02X, data %04X at %04X\n", offset, data, cpustate->pc-1);
 	}
 }
 
diff --git a/src/mame/drivers/taitojc.c b/src/mame/drivers/taitojc.c
index 75264d660e6..5a2dbfbfcae 100644
--- a/src/mame/drivers/taitojc.c
+++ b/src/mame/drivers/taitojc.c
@@ -22,7 +22,7 @@ Top board: MOTHER PCB-C K11X0838A  M43E0325A
 |           (QFP208)   E23-30.40             E23-34.72      93C46.87              |
 |E23-26.4                                                                         |
 |                              MC68040RC25            CXD1178Q    TCO640FIO       |
-|424260     TMS320C31          (PGA TYPE)                         (QFP120)        |
+|424260     TMS320C51          (PGA TYPE)                         (QFP120)        |
 |           (QFP132)                                                              |
 |           labelled                                              TEST_SW         |
 |424260     "Taito E07-11"                                      MB3771   RESET_SW |
@@ -158,7 +158,7 @@ Top board: MOTHER PCB  K11X0835A  M43E0304A
 |TC514260 (QFP208)   uPD424210             E07-08.65              (QFP120)        |
 |E07-02.4                                                                         |
 |                                                                                 |
-|TMS320C31  43256                                                                 |
+|TMS320C51  43256                                                                 |
 |(QFP132)   43256              MC68040RC25          E07-10.116  93C46.91          |
 |labelled          TCO770CMU   (PGA TYPE)                    E07-04.115  TEST_SW  |
 |"Taito E07-11"    (QFP208)                         E07-09.82      MB3771         |
@@ -252,7 +252,7 @@ Top board: MOTHER PCB-C K11X0838A  M43E0325A
 |           (QFP208)   E23-30.40             E23-34.72      93C46.87              |
 |E23-26.4                                                                         |
 |                              MC68040RC25            CXD1178Q    TCO640FIO       |
-|424260     TMS320C31          (PGA TYPE)                         (QFP120)        |
+|424260     TMS320C51          (PGA TYPE)                         (QFP120)        |
 |           (QFP132)                                                              |
 |           labelled                                              TEST_SW         |
 |424260     "Taito E07-11"                                      MB3771   RESET_SW |