diff --git a/libs/ezsat/ezsat.cc b/libs/ezsat/ezsat.cc
index f21c8ee2a..e37031314 100644
--- a/libs/ezsat/ezsat.cc
+++ b/libs/ezsat/ezsat.cc
@@ -24,6 +24,9 @@
 #include <stdlib.h>
 #include <assert.h>
 
+const int ezSAT::TRUE = 1;
+const int ezSAT::FALSE = 2;
+
 ezSAT::ezSAT()
 {
 	literal("TRUE");
diff --git a/libs/ezsat/ezsat.h b/libs/ezsat/ezsat.h
index 8371071ed..2674d83df 100644
--- a/libs/ezsat/ezsat.h
+++ b/libs/ezsat/ezsat.h
@@ -44,8 +44,8 @@ public:
 		OpNot, OpAnd, OpOr, OpXor, OpIFF, OpITE
 	};
 
-	const int TRUE = 1;
-	const int FALSE = 2;
+	static const int TRUE;
+	static const int FALSE;
 
 private:
 	std::map<std::string, int> literalsCache;
diff --git a/passes/cmds/Makefile.inc b/passes/cmds/Makefile.inc
index 9bf0fe658..166e91590 100644
--- a/passes/cmds/Makefile.inc
+++ b/passes/cmds/Makefile.inc
@@ -2,3 +2,4 @@
 OBJS += passes/cmds/select.o
 OBJS += passes/cmds/show.o
 OBJS += passes/cmds/rename.o
+OBJS += passes/cmds/scatter.o
diff --git a/passes/cmds/scatter.cc b/passes/cmds/scatter.cc
new file mode 100644
index 000000000..c396819a7
--- /dev/null
+++ b/passes/cmds/scatter.cc
@@ -0,0 +1,72 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *  
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *  
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "kernel/register.h"
+#include "kernel/celltypes.h"
+#include "kernel/rtlil.h"
+#include "kernel/log.h"
+
+struct ScatterPass : public Pass {
+	ScatterPass() : Pass("scatter", "add additional intermediate nets") { }
+	virtual void help()
+	{
+		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    scatter [selection]\n");
+		log("\n");
+		log("This command adds additional intermediate nets on all cell ports. This is used\n");
+		log("for testing the correct use of the SigMap halper in passes. If you don't know\n");
+		log("what this means: don't worry -- you only need this pass when testing your own\n");
+		log("extensions to Yosys.\n");
+		log("\n");
+		log("Use the opt_clean command to get rid of the additional nets.\n");
+		log("\n");
+	}
+	virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
+	{
+		CellTypes ct(design);
+		extra_args(args, 1, design);
+
+		for (auto &mod_it : design->modules)
+		{
+			if (!design->selected(mod_it.second))
+				continue;
+
+			for (auto &c : mod_it.second->cells)
+			for (auto &p : c.second->connections)
+			{
+				RTLIL::Wire *wire = new RTLIL::Wire;
+				wire->name = NEW_ID;
+				wire->width = p.second.width;
+				mod_it.second->add(wire);
+
+				if (ct.cell_output(c.second->type, p.first)) {
+					RTLIL::SigSig sigsig(p.second, wire);
+					mod_it.second->connections.push_back(sigsig);
+				} else {
+					RTLIL::SigSig sigsig(wire, p.second);
+					mod_it.second->connections.push_back(sigsig);
+				}
+
+				p.second = wire;
+			}
+		}
+	}
+} ScatterPass;
+ 
diff --git a/passes/cmds/show.cc b/passes/cmds/show.cc
index 4ed4a95cb..cb5ea379d 100644
--- a/passes/cmds/show.cc
+++ b/passes/cmds/show.cc
@@ -517,7 +517,7 @@ struct ShowPass : public Pass {
 		log("        more than one library.\n");
 		log("\n");
 		log("    -prefix <prefix>\n");
-		log("        generate <prefix>.dot and <prefix>.ps instead of yosys-show.{dot,ps}\n");
+		log("        generate <prefix>.dot and <prefix>.ps instead of ~/.yosys_show.{dot,ps}\n");
 		log("\n");
 		log("    -color <color> <wire>\n");
 		log("        assign the specified color to the specified wire. The object can be\n");
@@ -539,7 +539,7 @@ struct ShowPass : public Pass {
 		log("When no <format> is specified, SVG is used. When no <format> and <viewer> is\n");
 		log("specified, 'yosys-svgviewer' is used to display the schematic.\n");
 		log("\n");
-		log("The generated output files are 'yosys-show.dot' and 'yosys-show.<format>',\n");
+		log("The generated output files are '~/.yosys_show.dot' and '~/.yosys_show.<format>',\n");
 		log("unless another prefix is specified using -prefix <prefix>.\n");
 		log("\n");
 	}
@@ -553,7 +553,7 @@ struct ShowPass : public Pass {
 
 		std::string format;
 		std::string viewer_exe;
-		std::string prefix = "yosys-show";
+		std::string prefix = stringf("%s/.yosys_show", getenv("HOME") ? getenv("HOME") : ".");
 		std::vector<std::string> libfiles;
 		std::vector<RTLIL::Design*> libs;
 		uint32_t colorSeed = 0;