The Quake sources as originally release under the GPL license on December 21, 1999

WinQuake/vregset.h

@@ -0,0 +1,56 @@
+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+//
+// vregset.h: header file for video register-setting interpreter
+//
+
+//
+// registers & subregisters
+//
+#define MISC_OUTPUT	0x3C2
+
+#define SC_INDEX		0x3C4
+#define SC_DATA			0x3C5
+#define SYNC_RESET		0
+#define MAP_MASK		2
+#define MEMORY_MODE		4
+
+#define GC_INDEX		0x3CE
+#define GC_DATA			0x3CF
+#define READ_MAP		4
+#define GRAPHICS_MODE	5
+#define MISCELLANOUS	6
+
+#define CRTC_INDEX		0x3D4
+#define CRTC_DATA		0x3D5
+#define MAX_SCAN_LINE	9
+#define UNDERLINE		0x14
+#define	MODE_CONTROL	0x17
+
+//
+// register-set commands
+//
+#define VRS_END			0
+#define VRS_BYTE_OUT	1
+#define VRS_BYTE_RMW	2
+#define VRS_WORD_OUT	3
+
+void VideoRegisterSet (int *pregset);
+