diff --git a/src/mame/drivers/aristmk5.c b/src/mame/drivers/aristmk5.c
index ee364042a57..072529948f1 100644
--- a/src/mame/drivers/aristmk5.c
+++ b/src/mame/drivers/aristmk5.c
@@ -1,9 +1,25 @@
 /*
 
-   Aristocrat MK5 / MKV hardware
-   possibly 'Acorn Archimedes on a chip' hardware
+	Aristocrat MK5 / MKV hardware
+	possibly 'Acorn Archimedes on a chip' hardware
+
+	Note: ARM250 mapping is not identical to plain AA
+
+	code DASMing of POST (Adonis):
+	- bp 0x3400224:
+	  checks work RAM [0x87000], if bit 0 active high then all tests are ok, otherwise check what went wrong;
+		- bp 0x3400230: EPROM checksum branch test
+		- bp 0x3400258: DRAM Check branch test
+		- bp 0x3400280: CPU Check branch test
+		- bp 0x34002a8: SRAM Check branch test
+		- bp 0x34002d0: 2KHz Timer branch test
+		- bp 0x34002f8: DRAM emulator branch tests
+			- R0 == 0 "DRAM emulator found"
+			- R0 == 1 "DRAM emulator found"
+			- R0 == 3 "DRAM emulator not found - Error"
+			- R0 == 4 "DRAM emulator found instead of DRAM - Error"
+			- R0 == x "Undefined error in DRAM emulator area"
 
-   Note: ARM250 mapping is not identical to
 
 */
 
@@ -13,6 +29,7 @@
 #include "includes/archimds.h"
 
 extern UINT8 ioc_regs[0x80/4];
+extern INT16 memc_pages[(32*1024*1024)/(4096)];	// the logical RAM area is 32 megs, and the smallest page size is 4k
 extern void archimedes_request_irq_a(running_machine *machine, int mask);
 extern UINT32 *archimedes_memc_physmem;
 
@@ -31,6 +48,7 @@ static VIDEO_UPDATE(aristmk5)
 	// sets video DMA to 0x400 - 0x400 - 0xfe00
 	count = 0x800/4; // 0x400 text is offset???
 
+
 	for(y=0;y<480;y++)
 	{
 		for(x=0;x<640;x+=4)
@@ -77,6 +95,15 @@ static MACHINE_RESET( aristmk5 )
 {
 	archimedes_reset(machine);
 	ioc_regs[4]|=1; //set printer busy irq?
+
+	{
+		int i;
+		// kludge, set up MMU pages to a normal value, in order to draw all of the vram
+		for (i = 0; i < (32*1024*1024)/(4096); i++)
+		{
+			memc_pages[i] = i;
+		}
+	}
 }
 
 static MACHINE_DRIVER_START( aristmk5 )
diff --git a/src/mame/machine/archimds.c b/src/mame/machine/archimds.c
index 7615f6a951d..32c9246f654 100644
--- a/src/mame/machine/archimds.c
+++ b/src/mame/machine/archimds.c
@@ -40,7 +40,7 @@ static const int page_sizes[4] = { 4096, 8192, 16384, 32768 };
 UINT32 *archimedes_memc_physmem;
 static UINT32 memc_pagesize;
 static int memc_latchrom;
-static INT16 memc_pages[(32*1024*1024)/(4096)];	// the logical RAM area is 32 megs, and the smallest page size is 4k
+INT16 memc_pages[(32*1024*1024)/(4096)];	// the logical RAM area is 32 megs, and the smallest page size is 4k
 UINT32 vidc_regs[256];
 UINT8 ioc_regs[0x80/4];
 static UINT32 ioc_timercnt[4], ioc_timerout[4];
@@ -206,7 +206,7 @@ READ32_HANDLER(archimedes_memc_logical_r)
 		}
 		else
 		{
-			logerror("ARCHIMEDES_MEMC: Reading unmapped page\n");
+			logerror("ARCHIMEDES_MEMC: Reading unmapped page %02x\n",page);
 			return 0xdeadbeef;
 		}
 	}
@@ -237,7 +237,7 @@ WRITE32_HANDLER(archimedes_memc_logical_w)
 		}
 		else
 		{
-			logerror("ARCHIMEDES_MEMC: Writing unmapped page, what do we do?\n");
+			logerror("ARCHIMEDES_MEMC: Writing unmapped page %02x, what do we do?\n",page);
 		}
 	}
 }