diff --git a/build.sh b/build.sh
index a1884d3..e61df47 100755
--- a/build.sh
+++ b/build.sh
@@ -60,8 +60,6 @@ then
 	clang-format -i src/devices/controller.c
 	clang-format -i src/devices/datetime.h
 	clang-format -i src/devices/datetime.c
-	clang-format -i src/devices/debug.h
-	clang-format -i src/devices/debug.c
 	clang-format -i src/uxnasm.c
 	clang-format -i src/uxnemu.c
 	clang-format -i src/uxncli.c
@@ -100,8 +98,8 @@ fi
 
 echo "Building.."
 ${CC} ${CFLAGS} src/uxnasm.c -o bin/uxnasm
-${CC} ${CFLAGS} ${CORE} src/devices/system.c src/devices/file.c src/devices/datetime.c src/devices/debug.c src/devices/mouse.c src/devices/controller.c src/devices/screen.c src/devices/audio.c src/uxnemu.c ${UXNEMU_LDFLAGS} -o bin/uxnemu
-${CC} ${CFLAGS} ${CORE} src/devices/system.c src/devices/file.c src/devices/datetime.c src/devices/debug.c src/uxncli.c -o bin/uxncli
+${CC} ${CFLAGS} ${CORE} src/devices/system.c src/devices/file.c src/devices/datetime.c src/devices/mouse.c src/devices/controller.c src/devices/screen.c src/devices/audio.c src/uxnemu.c ${UXNEMU_LDFLAGS} -o bin/uxnemu
+${CC} ${CFLAGS} ${CORE} src/devices/system.c src/devices/file.c src/devices/datetime.c src/uxncli.c -o bin/uxncli
 
 if [ -d "$HOME/bin" ]
 then
diff --git a/mkfile b/mkfile
index 8e269bd..bf42d9f 100644
--- a/mkfile
+++ b/mkfile
@@ -9,7 +9,6 @@ HFILES=\
 	src/devices/audio.h\
 	src/devices/controller.h\
 	src/devices/datetime.h\
-	src/devices/debug.h\
 	src/devices/file.h\
 	src/devices/mouse.h\
 	src/devices/screen.h\
@@ -34,19 +33,19 @@ bin:
 %.rom:Q: %.tal bin/uxnasm
 	bin/uxnasm $stem.tal $target >/dev/null
 
-bin/uxncli: file.$O datetime.$O debug.$O system.$O uxncli.$O uxn.$O
+bin/uxncli: file.$O datetime.$O system.$O uxncli.$O uxn.$O
 	$LD $LDFLAGS -o $target $prereq
 
 bin/uxnasm: uxnasm.$O
 	$LD $LDFLAGS -o $target $prereq
 
-bin/uxnemu: audio.$O controller.$O datetime.$O debug.$O file.$O mouse.$O screen.$O system.$O uxn.$O uxnemu.$O
+bin/uxnemu: audio.$O controller.$O datetime.$O file.$O mouse.$O screen.$O system.$O uxn.$O uxnemu.$O
 	$LD $LDFLAGS -o $target $prereq
 
 (uxnasm|uxncli|uxnemu|uxn)\.$O:R: src/\1.c
 	$CC $CFLAGS -Isrc -o $target src/$stem1.c
 
-(audio|controller|datetime|debug|file|mouse|screen|system)\.$O:R: src/devices/\1.c
+(audio|controller|datetime|file|mouse|screen|system)\.$O:R: src/devices/\1.c
 	$CC $CFLAGS -Isrc -o $target src/devices/$stem1.c
 
 nuke:V: clean
diff --git a/src/devices/system.c b/src/devices/system.c
index 4d9bbec..c807ff1 100644
--- a/src/devices/system.c
+++ b/src/devices/system.c
@@ -22,6 +22,22 @@ static const char *errors[] = {
 	"Working-stack division by zero",
 	"Return-stack division by zero"};
 
+static void
+inspect(Stack *s, char *name)
+{
+	Uint8 x, y;
+	fprintf(stderr, "\n%s\n", name);
+	for(y = 0; y < 0x04; y++) {
+		for(x = 0; x < 0x08; x++) {
+			Uint8 p = y * 0x08 + x;
+			fprintf(stderr,
+				p == s->ptr ? "[%02x]" : " %02x ",
+				s->dat[p]);
+		}
+		fprintf(stderr, "\n");
+	}
+}
+
 int
 uxn_halt(Uxn *u, Uint8 error, Uint16 addr)
 {
@@ -59,6 +75,10 @@ system_deo(Device *d, Uint8 port)
 	switch(port) {
 	case 0x2: d->u->wst.ptr = d->dat[port]; break;
 	case 0x3: d->u->rst.ptr = d->dat[port]; break;
+	case 0xe:
+		inspect(&d->u->wst, "Working-stack");
+		inspect(&d->u->rst, "Return-stack");
+		break;
 	default: system_deo_special(d, port);
 	}
 }
diff --git a/src/devices/system.h b/src/devices/system.h
index 35f81a6..cca011e 100644
--- a/src/devices/system.h
+++ b/src/devices/system.h
@@ -9,6 +9,11 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE.
 */
 
+typedef struct SystemDevice {
+	Device device;
+	struct UxnScreen *screen;
+} SystemDevice;
+
 Uint8 system_dei(Device *d, Uint8 port);
 void system_deo(Device *d, Uint8 port);
 void system_deo_special(Device *d, Uint8 port);
diff --git a/src/uxncli.c b/src/uxncli.c
index ffa3352..12a7f65 100644
--- a/src/uxncli.c
+++ b/src/uxncli.c
@@ -5,7 +5,6 @@
 #include "devices/system.h"
 #include "devices/file.h"
 #include "devices/datetime.h"
-#include "devices/debug.h"
 
 /*
 Copyright (c) 2021 Devine Lu Linvega
diff --git a/src/uxnemu.c b/src/uxnemu.c
index 5560d6b..2361167 100644
--- a/src/uxnemu.c
+++ b/src/uxnemu.c
@@ -15,7 +15,6 @@
 #include "devices/controller.h"
 #include "devices/mouse.h"
 #include "devices/datetime.h"
-#include "devices/debug.h"
 #pragma GCC diagnostic pop
 #pragma clang diagnostic pop
 
@@ -280,7 +279,7 @@ start(Uxn *u, char *rom)
 	/* unused   */ uxn_port(u, 0xc, nil_dei, nil_deo);
 	/* unused   */ uxn_port(u, 0xd, nil_dei, nil_deo);
 	/* unused   */ uxn_port(u, 0xe, nil_dei, nil_deo);
-	/* unused   */ uxn_port(u, 0xf, debug_dei, debug_deo);
+	/* unused   */ uxn_port(u, 0xf, nil_dei, nil_deo);
 	if(!uxn_eval(u, PAGE_PROGRAM))
 		return error("Boot", "Failed to start rom.");
 	return 1;