diff --git a/eeshow/delta.c b/eeshow/delta.c
index 5325d5a..3ae1087 100644
--- a/eeshow/delta.c
+++ b/eeshow/delta.c
@@ -263,6 +263,8 @@ static bool obj_eq(const struct sch_obj *a, const struct sch_obj *b,
 			return 0;
 		if (a->u.comp.unit != b->u.comp.unit)
 			return 0;
+		if (a->u.comp.convert != b->u.comp.convert)
+			return 0;
 		if (memcmp(a->u.comp.m, b->u.comp.m, sizeof(a->u.comp.m)))
 			return 0;
 		return comp_fields_eq(a->u.comp.fields, b->u.comp.fields);
diff --git a/eeshow/lib-render.c b/eeshow/lib-render.c
index 1bfc463..366ee43 100644
--- a/eeshow/lib-render.c
+++ b/eeshow/lib-render.c
@@ -403,7 +403,8 @@ static void missing_component(const int m[4])
 }
 
 
-void lib_render(const struct comp *comp, unsigned unit, const int m[4])
+void lib_render(const struct comp *comp, unsigned unit, unsigned convert,
+    const int m[4])
 {
 	const struct lib_obj *obj;
 
@@ -416,6 +417,8 @@ void lib_render(const struct comp *comp, unsigned unit, const int m[4])
 	for (obj = comp->objs; obj; obj = obj->next) {
 		if (obj->unit && obj->unit != unit)
 			continue;
+		if (obj->convert && obj->convert != convert)
+			continue;
 		draw(comp, obj, m);
 	}
 }
diff --git a/eeshow/lib.h b/eeshow/lib.h
index e04c05f..adc703e 100644
--- a/eeshow/lib.h
+++ b/eeshow/lib.h
@@ -123,7 +123,8 @@ extern struct comp *comps;
 
 const struct comp *lib_find(const struct lib *lib, const char *name);
 bool lib_field_visible(const struct comp *comp, int n);
-void lib_render(const struct comp *comp, unsigned unit, const int m[6]);
+void lib_render(const struct comp *comp, unsigned unit, unsigned convert,
+    const int m[6]);
 
 bool lib_parse_file(struct lib *lib, struct file *file);
 bool lib_parse(struct lib *lib, const char *name, const struct file *related);
diff --git a/eeshow/sch-parse.c b/eeshow/sch-parse.c
index 12b8e88..1a2832d 100644
--- a/eeshow/sch-parse.c
+++ b/eeshow/sch-parse.c
@@ -491,7 +491,8 @@ static bool parse_line(const struct file *file, void *user, const char *line)
 			free(s);
 			return 1;
 		}
-		if (sscanf(line, "U %u", &obj->u.comp.unit) == 1)
+		if (sscanf(line, "U %u %u",
+		    &obj->u.comp.unit, &obj->u.comp.convert) == 2)
 			return 1;
 		if (sscanf(line, "P %d %d", &obj->x, &obj->y) == 2)
 			return 1;
diff --git a/eeshow/sch-render.c b/eeshow/sch-render.c
index 79d345c..0f3c6eb 100644
--- a/eeshow/sch-render.c
+++ b/eeshow/sch-render.c
@@ -162,7 +162,8 @@ void sch_render(const struct sheet *sheet)
 				const struct sch_comp *comp = &obj->u.comp;
 				const struct comp_field *field;
 
-				lib_render(comp->comp, comp->unit, comp->m);
+				lib_render(comp->comp, comp->unit,
+				    comp->convert, comp->m);
 				for (field = comp->fields; field;
 				    field = field->next)
 					dump_field(field, comp->m);
diff --git a/eeshow/sch.h b/eeshow/sch.h
index 2c2434f..dfd5917 100644
--- a/eeshow/sch.h
+++ b/eeshow/sch.h
@@ -65,6 +65,7 @@ struct sch_obj {
 		struct sch_comp {
 			const struct comp *comp; /* current component */
 			unsigned unit;	/* unit of current component */
+			unsigned convert;/* "De Morgan"  selection */
 			struct comp_field {
 				struct text txt;
 				struct comp_field *next;