diff --git a/util/vgabios/int10.c b/util/vgabios/int10.c
new file mode 100644
index 0000000..702be4f
--- /dev/null
+++ b/util/vgabios/int10.c
@@ -0,0 +1,478 @@
+#include <stdio.h>
+#include "test.h"
+#include "pci.h"
+
+void x86emu_dump_xregs(void);
+extern ptr current;
+extern int verbose;
+
+
+#ifndef _PC
+/*
+ * This is derived from a number of PC system BIOS'es.  The intent here is to
+ * provide very primitive video support, before an EGA/VGA BIOS installs its
+ * own interrupt vector.  Here, "Ignored" calls should remain so.  "Not
+ * Implemented" denotes functionality that can be implemented should the need
+ * arise.  What are "Not Implemented" throughout are video memory accesses.
+ * Also, very little input validity checking is done here.
+ */
+int int42_handler()
+{
+
+	if (verbose && X86_AH != 0x0e) {
+		printf("int%x\n", current->num);
+		x86emu_dump_xregs();
+	}
+
+	switch (X86_AH) {
+	case 0x00:
+		/* Set Video Mode                                     */
+		/* Enter:  AL = video mode number                     */
+		/* Leave:  Nothing                                    */
+		/* Implemented (except for clearing the screen)       */
+		{		/* Localise */
+			int i;
+			u16 ioport, int1d, regvals, tmp;
+			u8 mode, cgamode, cgacolour;
+
+			/*
+			 * Ignore all mode numbers but 0x00-0x13.  Some systems also ignore
+			 * 0x0B and 0x0C, but don't do that here.
+			 */
+			if (X86_AL > 0x13)
+				break;
+
+			/*
+			 * You didn't think that was really the mode set, did you?  There
+			 * are only so many slots in the video parameter table...
+			 */
+			mode = X86_AL;
+			ioport = 0x03D4;
+			switch (MEM_RB(0x0410) & 0x30) {
+			case 0x30:	/* MDA */
+				mode = 0x07;	/* Force mode to 0x07 */
+				ioport = 0x03B4;
+				break;
+			case 0x10:	/* CGA 40x25 */
+				if (mode >= 0x07)
+					mode = 0x01;
+				break;
+			case 0x20:	/* CGA 80x25 (MCGA?) */
+				if (mode >= 0x07)
+					mode = 0x03;
+				break;
+			case 0x00:	/* EGA/VGA */
+				if (mode >= 0x07)	/* Don't try MDA timings */
+					mode = 0x01;	/* !?!?! */
+				break;
+			}
+
+			/* Locate data in video parameter table */
+			int1d = MEM_RW(0x1d << 2);
+			regvals = ((mode >> 1) << 4) + int1d;
+			cgacolour = 0x30;
+			if (mode == 0x06) {
+				regvals -= 0x10;
+				cgacolour = 0x3F;
+			}
+
+	    /** Update BIOS Data Area **/
+
+			/* Video mode */
+			MEM_WB(0x0449, mode);
+
+			/* Columns */
+			tmp = MEM_RB(mode + int1d + 0x48);
+			MEM_WW(0x044A, tmp);
+
+			/* Page length */
+			tmp = MEM_RW((mode & 0x06) + int1d + 0x40);
+			MEM_WW(0x044C, tmp);
+
+			/* Start Address */
+			MEM_WW(0x044E, 0);
+
+			/* Cursor positions, one for each display page */
+			for (i = 0x0450; i < 0x0460; i += 2)
+				MEM_WW(i, 0);
+
+			/* Cursor start & end scanlines */
+			tmp = MEM_RB(regvals + 0x0B);
+			MEM_WB(0x0460, tmp);
+			tmp = MEM_RB(regvals + 0x0A);
+			MEM_WB(0x0461, tmp);
+
+			/* Current display page number */
+			MEM_WB(0x0462, 0);
+
+			/* CRTC I/O address */
+			MEM_WW(0x0463, ioport);
+
+			/* CGA Mode register value */
+			cgamode = MEM_RB(mode + int1d + 0x50);
+			MEM_WB(0x0465, cgamode);
+
+			/* CGA Colour register value */
+			MEM_WB(0x0466, cgacolour);
+
+			/* Rows */
+			MEM_WB(0x0484, (25 - 1));
+
+			/* Programme the mode */
+			outb(ioport + 4, cgamode & 0x37);	/* Turn off screen */
+			for (i = 0; i < 0x10; i++) {
+				tmp = MEM_RB(regvals + i);
+				outb(ioport, i);
+				outb(ioport + 1, tmp);
+			}
+			outb(ioport + 5, cgacolour);	/* Select colour mode */
+			outb(ioport + 4, cgamode);	/* Turn on screen */
+		}
+		break;
+
+	case 0x01:
+		/* Set Cursor Type                                    */
+		/* Enter:  CH = starting line for cursor              */
+		/*         CL = ending line for cursor                */
+		/* Leave:  Nothing                                    */
+		/* Implemented                                        */
+		{		/* Localise */
+			u16 ioport = MEM_RW(0x0463);
+
+			MEM_WB(0x0460, X86_CL);
+			MEM_WB(0x0461, X86_CH);
+
+			outb(ioport, 0x0A);
+			outb(ioport + 1, X86_CH);
+			outb(ioport, 0x0B);
+			outb(ioport + 1, X86_CL);
+		}
+		break;
+
+	case 0x02:
+		/* Set Cursor Position                                */
+		/* Enter:  BH = display page number                   */
+		/*         DH = row                                   */
+		/*         DL = column                                */
+		/* Leave:  Nothing                                    */
+		/* Implemented                                        */
+		{		/* Localise */
+			u16 offset, ioport;
+
+			MEM_WB((X86_BH << 1) + 0x0450, X86_DL);
+			MEM_WB((X86_BH << 1) + 0x0451, X86_DH);
+
+			if (X86_BH != MEM_RB(0x0462))
+				break;
+
+			offset = (X86_DH * MEM_RW(0x044A)) + X86_DL;
+			offset += MEM_RW(0x044E) << 1;
+
+			ioport = MEM_RW(0x0463);
+			outb(ioport, 0x0E);
+			outb(ioport + 1, offset >> 8);
+			outb(ioport, 0x0F);
+			outb(ioport + 1, offset & 0xFF);
+		}
+		break;
+
+	case 0x03:
+		/* Get Cursor Position                                */
+		/* Enter:  BH = display page number                   */
+		/* Leave:  CH = starting line for cursor              */
+		/*         CL = ending line for cursor                */
+		/*         DH = row                                   */
+		/*         DL = column                                */
+		/* Implemented                                        */
+		{		/* Localise */
+			X86_CL = MEM_RB(0x0460);
+			X86_CH = MEM_RB(0x0461);
+			X86_DL = MEM_RB((X86_BH << 1) + 0x0450);
+			X86_DH = MEM_RB((X86_BH << 1) + 0x0451);
+		}
+		break;
+
+	case 0x04:
+		/* Get Light Pen Position                             */
+		/* Enter:  Nothing                                    */
+		/* Leave:  AH = 0x01 (down/triggered) or 0x00 (not)   */
+		/*         BX = pixel column                          */
+		/*         CX = pixel row                             */
+		/*         DH = character row                         */
+		/*         DL = character column                      */
+		/* Not Implemented                                    */
+		{		/* Localise */
+			printf("int%x - Get Light Pen Position. "
+			       "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+			X86_AH = X86_BX = X86_CX = X86_DX = 0;
+		}
+		break;
+
+	case 0x05:
+		/* Set Display Page                                   */
+		/* Enter:  AL = display page number                   */
+		/* Leave:  Nothing                                    */
+		/* Implemented                                        */
+		{		/* Localise */
+			u16 start, ioport = MEM_RW(0x0463);
+			u8 x, y;
+
+			/* Calculate new start address */
+			MEM_WB(0x0462, X86_AL);
+			start = X86_AL * MEM_RW(0x044C);
+			MEM_WW(0x044E, start);
+			start <<= 1;
+
+			/* Update start address */
+			outb(ioport, 0x0C);
+			outb(ioport + 1, start >> 8);
+			outb(ioport, 0x0D);
+			outb(ioport + 1, start & 0xFF);
+
+			/* Switch cursor position */
+			y = MEM_RB((X86_AL << 1) + 0x0450);
+			x = MEM_RB((X86_AL << 1) + 0x0451);
+			start += (y * MEM_RW(0x044A)) + x;
+
+			/* Update cursor position */
+			outb(ioport, 0x0E);
+			outb(ioport + 1, start >> 8);
+			outb(ioport, 0x0F);
+			outb(ioport + 1, start & 0xFF);
+		}
+		break;
+
+	case 0x06:
+		/* Initialise or Scroll Window Up                     */
+		/* Enter:  AL = lines to scroll up                    */
+		/*         BH = attribute for blank                   */
+		/*         CH = upper y of window                     */
+		/*         CL = left x of window                      */
+		/*         DH = lower y of window                     */
+		/*         DL = right x of window                     */
+		/* Leave:  Nothing                                    */
+		/* Not Implemented                                    */
+		{		/* Localise */
+			printf("int%x: Initialise or Scroll Window Up - "
+			       "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+		}
+		break;
+
+	case 0x07:
+		/* Initialise or Scroll Window Down                   */
+		/* Enter:  AL = lines to scroll down                  */
+		/*         BH = attribute for blank                   */
+		/*         CH = upper y of window                     */
+		/*         CL = left x of window                      */
+		/*         DH = lower y of window                     */
+		/*         DL = right x of window                     */
+		/* Leave:  Nothing                                    */
+		/* Not Implemented                                    */
+		{		/* Localise */
+			printf("int%x: Initialise or Scroll Window Down - "
+			       "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+
+		}
+		break;
+
+	case 0x08:
+		/* Read Character and Attribute at Cursor             */
+		/* Enter:  BH = display page number                   */
+		/* Leave:  AH = attribute                             */
+		/*         AL = character                             */
+		/* Not Implemented                                    */
+		{		/* Localise */
+			printf
+			    ("int%x: Read Character and Attribute at Cursor - "
+			     "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+
+			X86_AX = 0;
+		}
+		break;
+
+	case 0x09:
+		/* Write Character and Attribute at Cursor            */
+		/* Enter:  AL = character                             */
+		/*         BH = display page number                   */
+		/*         BL = attribute (text) or colour (graphics) */
+		/*         CX = replication count                     */
+		/* Leave:  Nothing                                    */
+		/* Not Implemented                                    */
+		{		/* Localise */
+			printf
+			    ("int%x: Write Character and Attribute at Cursor - "
+			     "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+
+		}
+		break;
+
+	case 0x0a:
+		/* Write Character at Cursor                          */
+		/* Enter:  AL = character                             */
+		/*         BH = display page number                   */
+		/*         BL = colour                                */
+		/*         CX = replication count                     */
+		/* Leave:  Nothing                                    */
+		/* Not Implemented                                    */
+		{		/* Localise */
+			printf("int%x: Write Character at Cursor - "
+			       "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+
+		}
+		break;
+
+	case 0x0b:
+		/* Set Palette, Background or Border                  */
+		/* Enter:  BH = 0x00 or 0x01                          */
+		/*         BL = colour or palette (respectively)      */
+		/* Leave:  Nothing                                    */
+		/* Implemented                                        */
+		{		/* Localise */
+			u16 ioport = MEM_RW(0x0463) + 5;
+			u8 cgacolour = MEM_RB(0x0466);
+
+			if (X86_BH) {
+				cgacolour &= 0xDF;
+				cgacolour |= (X86_BL & 0x01) << 5;
+			} else {
+				cgacolour &= 0xE0;
+				cgacolour |= X86_BL & 0x1F;
+			}
+
+			MEM_WB(0x0466, cgacolour);
+			outb(ioport, cgacolour);
+		}
+		break;
+
+	case 0x0c:
+		/* Write Graphics Pixel                               */
+		/* Enter:  AL = pixel value                           */
+		/*         BH = display page number                   */
+		/*         CX = column                                */
+		/*         DX = row                                   */
+		/* Leave:  Nothing                                    */
+		/* Not Implemented                                    */
+		{		/* Localise */
+			printf("int%x: Write Graphics Pixel - "
+			       "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+
+		}
+		break;
+
+	case 0x0d:
+		/* Read Graphics Pixel                                */
+		/* Enter:  BH = display page number                   */
+		/*         CX = column                                */
+		/*         DX = row                                   */
+		/* Leave:  AL = pixel value                           */
+		/* Not Implemented                                    */
+		{		/* Localise */
+			printf("int%x: Write Graphics Pixel - "
+			       "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+
+			X86_AL = 0;
+
+		}
+		break;
+
+	case 0x0e:
+		/* Write Character in Teletype Mode                   */
+		/* Enter:  AL = character                             */
+		/*         BH = display page number                   */
+		/*         BL = foreground colour                     */
+		/* Leave:  Nothing                                    */
+		/* Not Implemented                                    */
+		/* WARNING:  Emulation of BEL characters will require */
+		/*           emulation of RTC and PC speaker I/O.     */
+		/*           Also, this recurses through int 0x10     */
+		/*           which might or might not have been       */
+		/*           installed yet.                           */
+		{		/* Localise */
+#ifdef PARANOID
+			printf("int%x: Write Character in Teletype Mode - "
+			       "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+#endif
+			printf("%c", X86_AL);
+		}
+		break;
+
+	case 0x0f:
+		/* Get Video Mode                                     */
+		/* Enter:  Nothing                                    */
+		/* Leave:  AH = number of columns                     */
+		/*         AL = video mode number                     */
+		/*         BH = display page number                   */
+		/* Implemented                                        */
+		{		/* Localise */
+			X86_AH = MEM_RW(0x044A);
+			X86_AL = MEM_RB(0x0449);
+			X86_BH = MEM_RB(0x0462);
+		}
+		break;
+
+	case 0x10:
+		/* Colour Control (subfunction in AL)                 */
+		/* Enter:  Various                                    */
+		/* Leave:  Various                                    */
+		/* Ignored                                            */
+		break;
+
+	case 0x11:
+		/* Font Control (subfunction in AL)                   */
+		/* Enter:  Various                                    */
+		/* Leave:  Various                                    */
+		/* Ignored                                            */
+		break;
+
+	case 0x12:
+		/* Miscellaneous (subfunction in BL)                  */
+		/* Enter:  Various                                    */
+		/* Leave:  Various                                    */
+		/* Ignored.  Previous code here optionally allowed    */
+		/* the enabling and disabling of VGA, but no system   */
+		/* BIOS I've come across actually implements it.      */
+		break;
+
+	case 0x13:
+		/* Write String in Teletype Mode                      */
+		/* Enter:  AL = write mode                            */
+		/*         BL = attribute (if (AL & 0x02) == 0)       */
+		/*         CX = string length                         */
+		/*         DH = row                                   */
+		/*         DL = column                                */
+		/*         ES:BP = string segment:offset              */
+		/* Leave:  Nothing                                    */
+		/* Not Implemented                                    */
+		/* WARNING:  Emulation of BEL characters will require */
+		/*           emulation of RTC and PC speaker I/O.     */
+		/*           Also, this recurses through int 0x10     */
+		/*           which might or might not have been       */
+		/*           installed yet.                           */
+		{		/* Localise */
+			printf("int%x: Write String in Teletype Mode - "
+			       "Function not implemented.\n", current->num);
+			x86emu_dump_xregs();
+
+		}
+		break;
+
+	default:
+		/* Various extensions                                 */
+		/* Enter:  Various                                    */
+		/* Leave:  Various                                    */
+		/* Ignored                                            */
+		break;
+	}
+
+	return 1;
+}
+#endif