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diff --git a/system/alpha/h/ssb.h b/system/alpha/h/ssb.h
new file mode 100644
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+#ifndef __SSB_H_LOADED
+#define __SSB_H_LOADED
+/*****************************************************************************
+
+       Copyright © 1993, 1994 Digital Equipment Corporation,
+                       Maynard, Massachusetts.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted, provided
+that the copyright notice and this permission notice appear in all copies
+of software and supporting documentation, and that the name of Digital not
+be used in advertising or publicity pertaining to distribution of the software
+without specific, written prior permission. Digital grants this permission
+provided that you prominently mark, as not part of the original, any
+modifications made to this software or documentation.
+
+Digital Equipment Corporation disclaims all warranties and/or guarantees
+with regard to this software, including all implied warranties of fitness for
+a particular purpose and merchantability, and makes no representations
+regarding the use of, or the results of the use of, the software and
+documentation in terms of correctness, accuracy, reliability, currentness or
+otherwise; and you rely on the software, documentation and results solely at
+your own risk.
+
+******************************************************************************/
+
+/*
+ *  $Id: ssb.h,v 1.1.1.1 1997/10/30 23:27:17 verghese Exp $;
+ */
+
+/*
+ * $Log: ssb.h,v $
+ * Revision 1.1.1.1  1997/10/30 23:27:17  verghese
+ * current 10/29/97
+ *
+ * Revision 1.3  1994/08/05  20:13:47  fdh
+ * Updated Copyright header and RCS $Id: identifier.
+ *
+ * Revision 1.2  1994/06/20  14:18:59  fdh
+ * Fixup header file preprocessor #include conditionals.
+ *
+ * Revision 1.1  1993/06/08  19:56:16  fdh
+ * Initial revision
+ *
+ */
+
+
+
+/* ssbinit 						*/
+/* Set up SSB definitions				*/
+/* Last modified on 1/3/91 by L. Stewart		*/
+
+#define SSB_stcreset1  0x0800	/*  CR_DIR */
+#define SSB_stcreset2  0x3820	/* CR_CABEN | CR_AUTO | CR_DIR */
+                                        /*  |  CR_FIFOMR */
+
+#define SSB_TagCable	 0
+#define SSB_TagSlot	 3
+#define SSB_TagTVA	 2
+#define SSB_TagRFA	 1
+#define SSB_TagORF	 5
+#define SSB_TagStartTV	 4
+#define SSB_TagTVStat	 6
+#define SSB_TagLocalStat 7
+
+#define SSB_AdrLocalStat 0x4000
+#define SSB_AdrSRA 0x8000
+#define SSB_AdrSRB 0x8001
+
+#define SSB_LCRenable	0x1
+#define SSB_LCRclrstat	0x2
+#define SSB_LCRfifomr	0x4
+#define SSB_LCRreset	0x8
+#define SSB_LCRled	0x10
+
+#define SSB_LSTfifoff	 0x100
+#define SSB_LSTfifohf	 0x200
+#define SSB_LSTfifoef	 0x400
+#define SSB_LSTinst	 0x800
+#define SSB_LSTid	 0x1000
+#define SSB_LSTotherinst 0x2000
+#define SSB_LSTcnfg0	 0x4000
+#define SSB_LSTcnfg1     0x8000
+#define SSB_LSTnode	 0xf000
+
+#define SSB_CRrParityS	 0x01
+#define SSB_CRdataWP	 0x02
+#define SSB_CRadrWP	 0x04
+#define SSB_CRerrEnable	 0x08
+#define SSB_CRreset	 0x10
+#define SSB_CRdoConfig	 0x20
+#define SSB_CRnodeClock	 0x40
+
+#define SSB_SRAshared	 0x00000080
+#define SSB_SRAdirty	 0x00100000
+#define SSB_SRAnType	 0x80000000
+
+#define SSB_PSRinst	 0x001
+#define SSB_PSRmerror	 0x002
+#define SSB_PSRreset	 0x004
+#define SSB_PSRerror	 0x008
+#define SSB_PSRserror	 0x010
+#define SSB_PSRisr	 0x7e0
+
+struct SSB_lsrtype {
+        unsigned	sequence : 8;
+        unsigned	slot : 8;
+        unsigned	mix : 4;
+        unsigned	inst : 1;
+        unsigned	ef : 1;
+        unsigned	hf : 1;
+        unsigned	ff : 1;
+        unsigned	crpad : 3;
+        unsigned	crled : 1;
+        unsigned	crreset : 1;
+        unsigned	crfifomr : 1;
+        unsigned	crclrstat : 1;
+        unsigned	crenable : 1;
+};
+
+struct SSB_pstattype {
+        unsigned	pad : 21;
+        unsigned	isr : 6;
+        unsigned	serror : 1;
+        unsigned	error : 1;
+        unsigned	reset : 1;
+        unsigned	merror : 1;
+        unsigned	inst : 1;
+};
+
+struct SSB_sratype {
+        unsigned	nodeType : 1;
+        unsigned	p0stat: 11;
+        unsigned	dirty : 1;
+        unsigned	p1stat : 11;
+        unsigned	shared : 1;
+        unsigned	cr : 7;
+};
+
+struct SSB_srbtype {
+        unsigned	p1count : 8;
+        unsigned	p0count : 8;
+        unsigned	arbcount : 16;
+};
+
+extern int ssb_sequence;
+extern int ssb_localcr;
+extern int ssb_maincr;
+extern int ssb_port;
+extern int ssb_node;
+extern int ssb_config1;
+extern int ssb_config0;
+extern int ssb_lastsra;
+extern int ssb_lastsrb;
+extern int ssb_lastlsr;
+extern int ssb_lastieecc;
+extern struct SSB_lsrtype ssb_lsr;
+extern int ssb_mix;
+extern struct SSB_sratype ssb_sra;
+extern struct SSB_srbtype ssb_srb;
+extern int ssb_resid;
+extern struct SSB_pstattype ssb_portstatus;
+
+
+/* ssb routines */
+#define SSB_CR  SSB_stcreset2
+#define SSBCH   1020
+
+#define SSB_CABLE(x) (wfifo(x, SSB_TagCable))
+#define SSB_LDSLOT(x) (wfifo(x, SSB_TagSlot))
+#define SSB_LDTVA(x, w) (wfifo((x) | ((w) ? 0x80000000 : 0), SSB_TagTVA))
+#define SSB_LDRFA(a, c) (wfifo(((255 - c) << 16) + a, SSB_TagRFA))
+#define SSB_LDORF(x) (wfifo(x, SSB_TagORF))
+#define SSB_STARTTV(a, c, w) (wfifo(( (w << 15) | ((255 - c) << 16) | a), SSB_TagStartTV ))
+#define SSB_TVSTAT(x) (wfifo(x, SSB_TagTVStat))
+#define SSB_LOCALSTAT(x) (wfifo(x, SSB_TagLocalStat))
+
+#define SSB_CFF() ( STC_SETCR(tvp->crmask & ~STC_CRFIFOMR), \
+    STC_SETCR(tvp->crmask | STC_CRFIFOMR) )
+
+#endif /* __SSB_H_LOADED */