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diff --git a/nx-X11/programs/Xserver/hw/sunLynx/btreg.h b/nx-X11/programs/Xserver/hw/sunLynx/btreg.h
new file mode 100644
index 000000000..cca573cc6
--- /dev/null
+++ b/nx-X11/programs/Xserver/hw/sunLynx/btreg.h
@@ -0,0 +1,81 @@
+/* $Xorg: btreg.h,v 1.3 2000/08/17 19:48:36 cpqbld Exp $ */
+/*
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Lawrence Berkeley Laboratory.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)btreg.h	8.2 (Berkeley) 1/21/94
+ */
+/*	$NetBSD: btreg.h,v 1.2 1994/11/20 20:51:55 deraadt Exp $ */
+/*	$XFree86: xc/programs/Xserver/hw/sunLynx/btreg.h,v 3.1 1996/12/27 06:51:31 dawes Exp $ */
+
+/*
+ * Several Sun color frame buffers use some kind of Brooktree video
+ * DAC (e.g., the Bt458, -- in any case, Brooktree make the only
+ * decent color frame buffer chips).
+ *
+ * Color map control on these is a bit funky in a SPARCstation.
+ * To update the color map one would normally do byte writes, but
+ * the hardware takes longword writes.  Since there are three
+ * registers for each color map entry (R, then G, then B), we have
+ * to set color 1 with a write to address 0 (setting 0's R/G/B and
+ * color 1's R) followed by a second write to address 1 (setting
+ * color 1's G/B and color 2's R/G).  Software must therefore keep
+ * a copy of the current map.
+ *
+ * The colormap address register increments automatically, so the
+ * above write is done as:
+ *
+ *	bt->bt_addr = 0;
+ *	bt->bt_cmap = R0G0B0R1;
+ *	bt->bt_cmap = G1B1R2G2;
+ *	...
+ *
+ * Yow!
+ *
+ * Bonus complication: on the cg6, only the top 8 bits of each 32 bit
+ * register matter, even though the cg3 takes all the bits from all
+ * bytes written to it.
+ */
+struct bt_regs {
+	u_int	bt_addr;		/* map address register */
+	u_int	bt_cmap;		/* colormap data register */
+	u_int	bt_ctrl;		/* control register */
+	u_int	bt_omap;		/* overlay (cursor) map register */
+};