diff --git a/Makefile b/Makefile
index d500d4a..d502eed 100644
--- a/Makefile
+++ b/Makefile
@@ -106,6 +106,7 @@ CSRCS= \
 	fbmem.c \
 	fbmon.c \
 	fbmodedb.c \
+	offscreen.c \
 	\
 	videl.c \
 	video.c \
diff --git a/bas.lk.in b/bas.lk.in
index 5787b0c..1653ff9 100644
--- a/bas.lk.in
+++ b/bas.lk.in
@@ -84,6 +84,7 @@ SECTIONS
 		OBJDIR/fbmem.o
 		OBJDIR/fbmon.o
 		OBJDIR/fbmodedb.o
+		OBJDIR/offscreen.o
 
 		OBJDIR/biosemu.o
 
diff --git a/include/fb.h b/include/fb.h
index dc62f70..4989d40 100644
--- a/include/fb.h
+++ b/include/fb.h
@@ -475,7 +475,7 @@ extern void framebuffer_release(struct fb_info *info);
 /* offscreen.c */
 extern long offscreen_free(struct fb_info *info, long addr);
 extern long offscreen_alloc(struct fb_info *info, long amount);
-extern long offscren_reserved(void);
+extern long offscren_reserved(struct fb_info *info);
 extern void offscreen_init(struct fb_info *info);
 
 /* fbmon.c */
diff --git a/radeon/radeon_base.c b/radeon/radeon_base.c
index 50a625c..36f55ef 100644
--- a/radeon/radeon_base.c
+++ b/radeon/radeon_base.c
@@ -2147,7 +2147,7 @@ int32_t radeonfb_pci_register(int32_t handle, const struct pci_device_id *ent)
 
 	/* Probe screen types */
 	dbg("radeonfb: radeonfb_pci_register: probe screen types, monitor_layout: 0x%x\r\n", monitor_layout);
-	radeon_probe_screens(rinfo, monitor_layout, (int)ignore_edid);
+	radeon_probe_screens(rinfo, monitor_layout, (int) ignore_edid);
 
 	/* Build mode list, check out panel native model */
 	dbg("radeonfb: radeonfb_pci_register: build mode list\r\n");
diff --git a/video/offscreen.c b/video/offscreen.c
new file mode 100644
index 0000000..87d1052
--- /dev/null
+++ b/video/offscreen.c
@@ -0,0 +1,302 @@
+/*
+ *	offscreen.c
+ *
+ * based from Emutos / BDOS
+ * 
+ * Copyright (c) 2001 Lineo, Inc.
+ *
+ * Authors: Karl T. Braun, Martin Doering, Laurent Vogel
+ *
+ * This file is distributed under the GPL, version 2 or at your
+ * option any later version.
+ */
+
+#include <mint/errno.h> 
+#include <mint/sysvars.h>
+#include <string.h>
+#include "fb.h"
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#undef DEBUG
+
+/* MD - Memory Descriptor */
+
+#define MD struct _md_
+
+MD
+{
+	MD *m_link;
+	long m_start;
+	long m_length;
+  void *m_own;
+};
+
+/* MPB - Memory Partition Block */
+
+#define MPB struct _mpb
+
+MPB
+{
+	MD *mp_mfl;
+	MD *mp_mal;
+	MD *mp_rover;
+};
+
+#define MAXMD 256
+
+static MD tab_md[MAXMD];
+static MPB pmd;
+static long wrap;
+
+static void *xmgetblk(void)
+{
+	int i;
+	for(i = 0; i < MAXMD; i++)
+	{
+		if(tab_md[i].m_own == NULL)
+		{
+			tab_md[i].m_own = (void*)1L;
+			return(&tab_md[i]);
+		}
+	}			   
+	return(NULL);
+}
+
+static void xmfreblk(void *m)
+{
+	int i = (int)(((long)m - (long)tab_md) / sizeof(MD));
+	if((i > 0) && (i < MAXMD))
+		tab_md[i].m_own = NULL;
+}
+
+static MD *ffit(long amount, MPB *mp)
+{
+	MD *p,*q,*p1;                    /* free list is composed of MD's */
+	int maxflg;
+	long maxval;
+	if(amount != -1)
+	{
+#if 1
+		amount += (wrap - 1);
+		amount /= wrap;
+		amount  *= wrap;               /* screen line alignment */
+#else
+		amount += 15;                  /* 16 bytes alignment */
+		amount &= 0xFFFFFFF0;
+#endif
+	}
+	if((q = mp->mp_rover) == 0)      /* get rotating pointer */
+		return(0) ;
+	maxval = 0;
+	maxflg = ((amount == -1) ? TRUE : FALSE) ;
+	p = q->m_link;                   /* start with next MD */
+	do /* search the list for an MD with enough space */
+	{
+		if(p == NULL)
+		{
+			/*  at end of list, wrap back to start  */
+			q = (MD *) &mp->mp_mfl;      /*  q => mfl field  */
+			p = q->m_link;               /*  p => 1st MD     */
+		}
+		if((!maxflg) && (p->m_length >= amount))
+		{
+			/*  big enough */
+			if(p->m_length == amount)
+				q->m_link = p->m_link;     /* take the whole thing */
+			else
+			{
+				/* break it up - 1st allocate a new
+				   MD to describe the remainder */
+				p1 = xmgetblk();
+				if(p1 == NULL)
+					return(NULL);
+				/* init new MD */
+				p1->m_length = p->m_length - amount;
+				p1->m_start = p->m_start + amount;
+				p1->m_link = p->m_link;
+				p->m_length = amount;      /* adjust allocated block */
+				q->m_link = p1;
+			}
+			/* link allocate block into allocated list,
+			    mark owner of block, & adjust rover  */
+			p->m_link = mp->mp_mal;
+			mp->mp_mal = p;
+			mp->mp_rover = (q == (MD *) &mp->mp_mfl ? q->m_link : q);
+			return(p);                   /* got some */
+		}
+		else if(p->m_length > maxval)
+			maxval = p->m_length;
+		p = ( q=p )->m_link;
+	}
+	while(q != mp->mp_rover);
+	/*  return either the max, or 0 (error)  */
+	if(maxflg)
+	{
+		maxval -= 15; /* 16 bytes alignment */
+		if(maxval < 0)
+			maxval = 0;
+		else
+			maxval &= 0xFFFFFFF0;
+	}
+	return(maxflg ? (MD *) maxval : 0);
+}
+
+static void freeit(MD *m, MPB *mp)
+{
+	MD *p, *q;
+	q = NULL;
+	for(p = mp->mp_mfl; p ; p = (q=p) -> m_link)
+	{
+		if(m->m_start <= p->m_start)
+			break;
+	}
+	m->m_link = p;
+	if(q)
+		q->m_link = m;
+	else
+		mp->mp_mfl = m;
+	if(!mp->mp_rover)
+		mp->mp_rover = m;
+	if(p)
+	{
+		if(m->m_start + m->m_length == p->m_start)
+		{ /* join to higher neighbor */
+			m->m_length += p->m_length;
+			m->m_link = p->m_link;
+			if(p == mp->mp_rover)
+				mp->mp_rover = m;
+			xmfreblk(p);
+		}
+	}
+	if(q)
+	{
+		if(q->m_start + q->m_length == m->m_start)
+		{ /* join to lower neighbor */
+			q->m_length += m->m_length;
+			q->m_link = m->m_link;
+			if(m == mp->mp_rover)
+				mp->mp_rover = q;
+			xmfreblk(m);
+		}
+	}
+}
+
+long offscreen_free(struct fb_info *info, long addr)
+{
+	MD *p,**q;
+	MPB *mpb;
+#ifdef DEBUG
+	char buf[10];
+	Funcs_puts("radeon_offscreen_free(0x");
+	Funcs_ltoa(buf, addr, 16);
+	Funcs_puts(buf);
+	Funcs_puts("\r\n");
+#endif
+	*vblsem = 0;
+	mpb = &pmd;
+	for(p = *(q = &mpb->mp_mal); p; p = *(q = &p->m_link))
+	{
+		if(addr == p->m_start)
+			break;
+	}
+	if(!p)
+	{
+		*vblsem = 1;
+		return(EFAULT);
+	}
+	*q = p->m_link;
+	freeit(p,mpb);
+	*vblsem = 1;
+	return(0);
+}
+
+long offscreen_alloc(struct fb_info *info, long amount)
+{
+	long ret;
+	MD *m;
+#ifdef DEBUG
+	char buf[10];
+	Funcs_puts("radeon_offscreen_alloc(0x");
+	Funcs_ltoa(buf, amount, 16);
+	Funcs_puts(buf);
+	Funcs_puts(") = 0x");
+#endif
+	*vblsem = 0;
+	if(amount == -1L)
+	{
+		ret = (long)ffit(-1L,&pmd);
+		*vblsem = 1;
+		return(ret);
+	}
+	if(amount <= 0 )
+	{
+		*vblsem = 1;
+		return(0);
+	}
+	if((amount & 1))
+		amount++;
+	m = ffit(amount,&pmd);
+	if(m == NULL)
+	{
+#ifdef DEBUG
+		Funcs_puts("0\r\n");
+#endif
+		*vblsem = 1;
+		return(0);
+	}
+#ifdef DEBUG
+	Funcs_ltoa(buf, m->m_start, 16);
+	Funcs_puts(buf);
+	Funcs_puts("\r\n");
+#endif
+	ret = (long)m->m_start;
+	*vblsem = 1;
+	return(ret);
+}
+
+long offscren_reserved(struct fb_info *info)
+{
+	return((long)info_fvdi->ram_base + (long) info->ram_size);
+}
+
+void offscreen_init(struct fb_info *info)
+{
+#ifdef DEBUG
+	char buf[10];
+#endif
+	long size_screen, max_offscreen_size;
+	wrap = (long)info->var.xres_virtual * (long)(info->var.bits_per_pixel / 8);
+	size_screen = (long)info->var.yres_virtual * wrap;
+	if(!size_screen)
+		size_screen = (long)info->screen_size;
+	pmd.mp_mfl = pmd.mp_rover = &tab_md[0];
+	tab_md[0].m_link = (MD *)NULL;
+	tab_md[0].m_start = (long)((unsigned long)info->ram_base + (unsigned long)size_screen);
+	tab_md[0].m_length = (long)info->ram_size - size_screen;
+	tab_md[0].m_own = (void *)1L;
+	max_offscreen_size = ((long)info->var.xres_virtual * 8192L * (long)(info->var.bits_per_pixel / 8)) - size_screen;
+	if(max_offscreen_size < 0)
+		max_offscreen_size = 0;
+	if(tab_md[0].m_length > max_offscreen_size)
+		tab_md[0].m_length = max_offscreen_size;
+#ifdef DEBUG
+	Funcs_puts("offscreen_init start 0x");
+	Funcs_ltoa(buf, tab_md[0].m_start, 16);
+	Funcs_puts(buf);
+	Funcs_puts(", length 0x");
+	Funcs_ltoa(buf, tab_md[0].m_length, 16);
+	Funcs_puts(buf);
+	Funcs_puts(", ram_size 0x");
+	Funcs_ltoa(buf, (long)info->ram_size, 16);
+	Funcs_puts(buf);
+	Funcs_puts("\r\n");
+#endif
+	pmd.mp_mal = (MD *)NULL;
+}
+
diff --git a/x86emu/biosemu.c b/x86emu/biosemu.c
index 32310b4..091f3ac 100644
--- a/x86emu/biosemu.c
+++ b/x86emu/biosemu.c
@@ -3,6 +3,7 @@
 #include "bas_printf.h"
 #include "bas_string.h"
 #include "util.h"
+#include "driver_mem.h"
 #include "x86emu.h"
 #include "pci.h"
 #include "pci_ids.h"
@@ -211,9 +212,7 @@ void outl(uint32_t val, uint16_t port)
 void do_int(int num)
 {
 	int ret = 0;
-//	DPRINTVAL("int ", num);
-//	DPRINTVALHEX(" vector at ", getIntVect(num));
-//	DPRINT("\r\n");
+
 	switch (num)
 	{
 #ifndef _PC
@@ -221,7 +220,7 @@ void do_int(int num)
 	case 0x42:
 	case 0x6D:
 		if (getIntVect(num) == 0x0000)
-			DPRINT("un-inited int vector\r\n");
+			dbg("uninitialised int vector\r\n");
 		if (getIntVect(num) == 0xFF065)
 		{
 			//ret = int42_handler();
@@ -542,64 +541,55 @@ void run_bios(struct radeonfb_info *rinfo)
 	X86EMU_intrFuncs intFuncs[256];
 
 	if ((rinfo->mmio_base == NULL) || (rinfo->io_base == NULL))
+	{
+		dbg("%s: rinfo->mmio_base = %p, rinfo->io_base = %p\r\n", __FUNCTION__);
 		return;
+	}
 	rinfo_biosemu = rinfo;
 	config_address_reg = 0;
 	offset_port = 0x300;
 #ifdef DIRECT_ACCESS
-	offset_io = (uint32_t)rinfo->io_base-(uint32_t)offset_port;
-	offset_mem = (uint32_t)rinfo->fb_base-0xA0000;
+	offset_io = (uint32_t) rinfo->io_base - (uint32_t) offset_port;
+	offset_mem = (uint32_t) rinfo->fb_base - 0xA0000;
 #else
-	offset_io = rinfo->io_base_phys-(uint32_t)offset_port;
-	offset_mem = rinfo->fb_base_phys-0xA0000;
+	offset_io = rinfo->io_base_phys -(uint32_t) offset_port;
+	offset_mem = rinfo->fb_base_phys - 0xA0000;
 #endif
-	rom_header = (struct rom_header *)0;
+	rom_header = (struct rom_header *) 0;
 	do
 	{
 		rom_header = (struct rom_header *)((unsigned long)rom_header + image_size); // get next image
 		rom_data = (struct pci_data *)((unsigned long)rom_header + (unsigned long)BIOS_IN16((long)&rom_header->data));
 		image_size = (unsigned long)BIOS_IN16((long)&rom_data->ilen) * 512;
-	}
-	while((BIOS_IN8((long)&rom_data->type) != 0) && (BIOS_IN8((long)&rom_data->indicator) != 0));  // make sure we got x86 version
-	if (BIOS_IN8((long)&rom_data->type) != 0)
-		return;
-	rom_size = (unsigned long)BIOS_IN8((long)&rom_header->size) * 512;
-	if (PCI_CLASS_DISPLAY_VGA == BIOS_IN16((long)&rom_data->class_hi))
+	} while ((BIOS_IN8((long) &rom_data->type) != 0) && (BIOS_IN8((long) &rom_data->indicator) != 0));  // make sure we got x86 version
+	if (BIOS_IN8((long) &rom_data->type) != 0)
 	{
-#ifdef USE_SDRAM
-#if 0
-		if (os_magic)
-		{
-			biosmem = Mxalloc(SIZE_EMU, 3);
-			if (biosmem == 0)
-				return;
-		}
-#endif
-#else
-		biosmem = Mxalloc(SIZE_EMU, 0);
+		dbg("%s: ROM data type = 0x%x\r\n", __FUNCTION__, BIOS_IN8((long) &rom_data->type));
+		return;
+	}
+	rom_size = (unsigned long) BIOS_IN8((long) &rom_header->size) * 512;
+	if (PCI_CLASS_DISPLAY_VGA == BIOS_IN16((long) &rom_data->class_hi))
+	{
+		biosmem = driver_mem_alloc(SIZE_EMU);
 		if (biosmem == 0)
-			return;
-#endif /* USE_SDRAM */
-		memset((char *)biosmem, 0, SIZE_EMU);
-		setup_system_bios((char *)biosmem);
-		DPRINTVALHEX("Copying VGA ROM Image from ", (long)rinfo->bios_seg+(long)rom_header);
-		DPRINTVALHEX(" to ", biosmem+PCI_VGA_RAM_IMAGE_START);
-		DPRINTVALHEX(", ", rom_size);
-		DPRINT(" bytes\r\n");
-#if 0 // 8 bits copy
-		ptr = (char *)biosmem;
-		for(i = (long)rom_header, j = PCI_VGA_RAM_IMAGE_START; i < (long)rom_header+rom_size; ptr[j++] = BIOS_IN8(i++));
-#else // 32 bits copy
 		{
-			long bytes_align = (long)rom_header & 3;
-			ptr = (unsigned char *)biosmem;
-			i = (long)rom_header;
+			dbg("%s: could not allocate X86 BIOS memory\r\n", __FUNCTION__);
+			return;
+		}
+		memset((char *) biosmem, 0, SIZE_EMU);
+		setup_system_bios((char *) biosmem);
+		dbg("Copying VGA ROM Image from %p to %p (0x%lx bytes)\r\n", (long) rinfo->bios_seg + (long) rom_header,
+				biosmem + PCI_VGA_RAM_IMAGE_START, rom_size);
+		{
+			long bytes_align = (long) rom_header & 3;
+
+			ptr = (unsigned char *) biosmem;
+			i = (long) rom_header;
 			j = PCI_VGA_RAM_IMAGE_START;
 			if (bytes_align)
 				for(; i < 4 - bytes_align; ptr[j++] = BIOS_IN8(i++));
-			for(; i < (long)rom_header+rom_size; *((unsigned long *)&ptr[j]) = swpl(BIOS_IN32(i)), i+=4, j+=4);
+			for(; i < (long) rom_header + rom_size; *((unsigned long *)&ptr[j]) = swpl(BIOS_IN32(i)), i += 4, j += 4);
 		}
-#endif
 		addr = PCI_VGA_RAM_IMAGE_START;	
 	}
 	else
@@ -620,34 +610,35 @@ void run_bios(struct radeonfb_info *rinfo)
 #endif /* USE_SDRAM */
 		setup_system_bios((char *)biosmem);
 		memset((char *)biosmem, 0, SIZE_EMU);
-		DPRINTVALHEX("Copying non-VGA ROM Image from ", (long)rinfo->bios_seg+(long)rom_header);
-		DPRINTVALHEX(" to ", biosmem+PCI_RAM_IMAGE_START);
-		DPRINTVALHEX(", ", rom_size);
-		DPRINT(" bytes\r\n");		
-		ptr = (unsigned char *)biosmem;
-		for(i = (long)rom_header, j = PCI_RAM_IMAGE_START; i < (long)rom_header+rom_size; ptr[j++] = BIOS_IN8(i++));
+		dbg("Copying non-VGA ROM Image from %p to %p (0x%lx bytes)\r\n",
+				(long) rinfo->bios_seg + (long) rom_header,
+				biosmem + PCI_RAM_IMAGE_START,
+				rom_size);
+		ptr = (unsigned char *) biosmem;
+		for (i = (long) rom_header, j = PCI_RAM_IMAGE_START; i < (long) rom_header+rom_size; ptr[j++] = BIOS_IN8(i++));
 		addr = PCI_RAM_IMAGE_START;
 	}
 	initialcs = (addr & 0xF0000) >> 4;
 	initialip = (addr + 3) & 0xFFFF;	
-	X86EMU_setMemBase((void *)biosmem, SIZE_EMU);
-	for(i = 0; i < 256; i++)
+	X86EMU_setMemBase((void *) biosmem, SIZE_EMU);
+	for (i = 0; i < 256; i++)
 		intFuncs[i] = do_int;
 	X86EMU_setupIntrFuncs(intFuncs);
 	{
 		char *date = "01/01/99";
-		for(i = 0; date[i]; i++)
+		for (i = 0; date[i]; i++)
 			wrb(0xffff5 + i, date[i]);
 		wrb(0xffff7, '/');
 		wrb(0xffffa, '/');
 	}
 	{
-    /* FixME: move PIT init to its own file */
-    outb(0x36, 0x43);
-    outb(0x00, 0x40);
-    outb(0x00, 0x40);
+    	/* FixME: move PIT init to its own file */
+    	outb(0x36, 0x43);
+    	outb(0x00, 0x40);
+    	outb(0x00, 0x40);
 	}
 //	setup_int_vect();
+
 	/* cpu setup */
 	X86_AX = devfn ? devfn : 0xff;
 	X86_DX = 0x80;
@@ -658,6 +649,7 @@ void run_bios(struct radeonfb_info *rinfo)
 	X86_SP = 0xfffe;
 	X86_DS = 0x0040;
 	X86_ES = 0x0000;
+
 	/* We need a sane way to return from bios
 	 * execution. A hlt instruction and a pointer
 	 * to it, both kept on the stack, will do.
@@ -671,13 +663,13 @@ void run_bios(struct radeonfb_info *rinfo)
 	pushw(X86_SP + 2);
 #ifdef DEBUG_X86EMU
 	X86EMU_trace_on();
-  X86EMU_set_debug(DEBUG_DECODE_F | DEBUG_TRACE_F);
+	X86EMU_set_debug(DEBUG_DECODE_F | DEBUG_TRACE_F);
 #endif
-	DPRINT("X86EMU entering emulator\r\n");
+	dbg("X86EMU entering emulator\r\n");
 	//*vblsem = 0;
 	X86EMU_exec();
 	//*vblsem = 1;
-	DPRINT("X86EMU halted\r\n");
+	dbg("X86EMU halted\r\n");
 //	biosfn_set_video_mode(0x13); /* 320 x 200 x 256 colors */
 #ifdef USE_SDRAM
 #if 0
@@ -688,7 +680,7 @@ void run_bios(struct radeonfb_info *rinfo)
 	}
 #endif
 #else
-	memset((char *)biosmem, 0, SIZE_EMU);
-	Mfree(biosmem);
+	memset((char *) biosmem, 0, SIZE_EMU);
+	driver_mem_free(biosmem);
 #endif /* USE_SDRAM */
 }