--- SheepShaver/src/emul_op.cpp	2005/03/05 19:07:35	1.19
+++ SheepShaver/src/emul_op.cpp	2008/01/01 09:47:38	1.23
@@ -1,7 +1,7 @@
 /*
  *  emul_op.cpp - 68k opcodes for ROM patches
  *
- *  SheepShaver (C) 1997-2005 Christian Bauer and Marc Hellwig
+ *  SheepShaver (C) 1997-2008 Christian Bauer and Marc Hellwig
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -282,8 +282,8 @@ void EmulOp(M68kRegisters *r, uint32 pc,
 			MacOSUtilReset();
 			AudioReset();
 
-			// Enable DR emulator
-			if (PrefsFindBool("jit68k")) {
+			// Enable DR emulator (disabled for now)
+			if (PrefsFindBool("jit68k") && 0) {
 				D(bug("DR activated\n"));
 				WriteMacInt32(KernelDataAddr + 0x17a0, 3);		// Prepare for DR emulator activation
 				WriteMacInt32(KernelDataAddr + 0x17c0, DR_CACHE_BASE);
@@ -409,6 +409,16 @@ void EmulOp(M68kRegisters *r, uint32 pc,
 			r->d[0] = (uint32)-7887;
 			break;
 
+		case OP_CHECK_SYSV: {		// Check we are not using MacOS < 8.1 with a NewWorld ROM
+			r->a[1] = r->d[1];
+			r->a[0] = ReadMacInt32(r->d[1]);
+			uint32 sysv = ReadMacInt16(r->a[0]);
+			D(bug("Detected MacOS version %d.%d.%d\n", (sysv >> 8) & 0xf, (sysv >> 4) & 0xf, sysv & 0xf));
+			if (ROMType == ROMTYPE_NEWWORLD && sysv < 0x0801)
+				r->d[1] = 0;
+			break;
+		}
+
 		case OP_NTRB_17_PATCH:
 			r->a[2] = ReadMacInt32(r->a[7]);
 			r->a[7] += 4;
@@ -463,14 +473,14 @@ void EmulOp(M68kRegisters *r, uint32 pc,
 		case OP_IDLE_TIME:
 			// Sleep if no events pending
 			if (ReadMacInt32(0x14c) == 0)
-				Delay_usec(16667);
+				idle_wait();
 			r->a[0] = ReadMacInt32(0x2b6);
 			break;
 
 		case OP_IDLE_TIME_2:
 			// Sleep if no events pending
 			if (ReadMacInt32(0x14c) == 0)
-				Delay_usec(16667);
+				idle_wait();
 			r->d[0] = (uint32)-2;
 			break;