From 9b2ed3594e7916b388f2b9f4db241f11a84c3828 Mon Sep 17 00:00:00 2001
From: gbeauche <>
Date: Tue, 30 Jan 2001 07:27:23 +0000
Subject: [PATCH] 	- Faked VIA, SCCRd, SCCWr base addressed to scratch
 memory area in 	  EMUL_OP_INSTALL_DRIVERS

---
 BasiliskII/TODO            |  7 +++++--
 BasiliskII/src/emul_op.cpp | 16 ++++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/BasiliskII/TODO b/BasiliskII/TODO
index 30aa108f..4c50c3d0 100644
--- a/BasiliskII/TODO
+++ b/BasiliskII/TODO
@@ -3,8 +3,11 @@ Bugs:
 - Something still seems to be wrong with the UAE FPU (Calculator and scroll
   bars in MacOS 8 don't work properly), Lauri has fixed this and it has to
   be integrated into the main sources
-- Unix: real addressing mode: something is still deadly wrong there though it
-  works for example under Linux/i386.
+- Real memory addressing: something is still wrong in the Unix part, though
+  it works under Linux/i386
+- Direct or real memory addressing: need to disable initialization of VIA,
+  SCCRd and SCCWr to invalid memory regions instead of patching them in
+  EMUL_OP_INSTALL_DRIVERS
 
 General:
 - Sony: rdVerify, Tag Buffer, DskErr
diff --git a/BasiliskII/src/emul_op.cpp b/BasiliskII/src/emul_op.cpp
index d6f43f3a..aa09f663 100644
--- a/BasiliskII/src/emul_op.cpp
+++ b/BasiliskII/src/emul_op.cpp
@@ -248,6 +248,22 @@ void EmulOp(uint16 opcode, M68kRegisters *r)
 				WriteMacInt8(asc_regs + 0x800, 0x0f);	// Set ASC version number
 				WriteMacInt32(0xcc0, asc_regs);			// Set ASCBase
 			}
+			
+#if (REAL_ADDRESSING || DIRECT_ADDRESSING) && defined(USE_SCRATCHMEM_SUBTERFUGE)
+			extern uint8 *ScratchMem;
+			
+			// Set VIA base address to scratch memory area
+			D(bug("Patch VIA base address [0x%x] to ScratchMem\n", ReadMacInt32(0x1d4)));
+			WriteMacInt32(0x1d4, Host2MacAddr(ScratchMem));
+			
+			// Set SCCRd base address to scratch memory area
+			D(bug("Patch SCCRd base address [0x%x] to ScratchMem\n", ReadMacInt32(0x1d8)));
+			WriteMacInt32(0x1d8, Host2MacAddr(ScratchMem));
+			
+			// Set SCCWr base address to scratch memory area
+			D(bug("Patch SCCWr base address [0x%x] to ScratchMem\n", ReadMacInt32(0x1dc)));
+			WriteMacInt32(0x1dc, Host2MacAddr(ScratchMem));
+#endif
 			break;
 		}