diff --git a/sys/pdpuba/sbd.c b/sys/pdpuba/sbd.c
index f7376025..3a0899f0 100644
--- a/sys/pdpuba/sbd.c
+++ b/sys/pdpuba/sbd.c
@@ -7,11 +7,13 @@
 #define NSBD 1
 
 /*
- * Default status register 0760010
+ * Default status register 0760040
  * Default vector 0270 (PRI 4)
  */
 
-struct sbddevice *sbd = (struct sbddevice *)0760010;
+#define dev_t int
+
+struct sbddevice *sbd = (struct sbddevice *)0760040;
 
 sbdattach(addr, unit)
      struct sbddevice *addr;
@@ -25,6 +27,26 @@ sbdopen(dev, flag)
      dev_t dev;
      short flag;
 {
+  static int cmd[] = {
+    22,  /* 22 bytes / 11 words */
+    (0 << 9) | SBD_FCPIX,
+    (0 << 9) | SBD_FCRUB,
+    (2 << 9) | SBD_FCALP,
+    0300, /* x coord */
+    0300, /* y coord */
+    06,   /* 6 characters */
+    "eh",
+    "ll",
+    "!o",
+    -1
+  };
+
+  /* we can probably ignore bits above 16 i think? */
+  unsigned int addr = (unsigned int)cmd;
+
+  sbd->hahl = 0000376 & addr;
+  sbd->hahr = 0177400 & addr;
+  sbd->hcsr = 0;
 
   return 0;
 }
diff --git a/sys/pdpuba/sbd.h b/sys/pdpuba/sbd.h
index b2d99f22..fc4e68f2 100644
--- a/sys/pdpuba/sbd.h
+++ b/sys/pdpuba/sbd.h
@@ -24,17 +24,30 @@
  */
 
 struct sbddevice {
-  char hcsr; /* Cmd and Status Register */
+  char hinv; /* Interrupt Vector        */
   char u0;   /* Unused                  */
-  char hahr; /* Host Address High       */
+  char hcsr; /* Cmd and Status Register */
   char u1;   /* Unused                  */
-  char hahl; /* Host Address Low        */
+  char hahr; /* Host Address High       */
   char u2;   /* Unused                  */
+  char hahl; /* Host Address Low        */
+  char u3;   /* Unused                  */
 };
 
+/* SBD Register Bitmasks */
 #define SBD_INTEN_HCSR 0200 /* _ I _ _ _ _ _ _ */
 #define SBD_READY_HCSR 0400 /* R _ _ _ _ _ _ _ */
 #define SBD_HADDR_HCSR 0077 /* _ _ A A A A A A */
 #define SBD_HADDR_HAHR 0377 /* A A A A A A A A */
 #define SBD_HADDR_HAHL 0376 /* A A A A A A A _ */
 #define SBD_ABORT_HAHL 0001 /* _ _ _ _ _ _ _ Q */
+
+/* SBD Function Codes */
+#define SBD_FCRUB      0006 /* Erase rectangle                     */
+#define SBD_FCPIX      0014 /* Display pixel graphics area         */
+#define SBD_FCVEC      0027 /* Draw vector                         */
+#define SBD_FCCIR      0032 /* Draw circle                         */
+#define SBD_FCALP      0035 /* Display text on pixel area          */
+#define SBD_FCWIB      0046 /* Write image block                   */
+#define SBD_FCRIB      0047 /* Read image block                    */
+