diff --git a/joeylib/src/jIIgs.asm b/joeylib/src/jIIgs.asm
index b177769..5091297 100644
--- a/joeylib/src/jIIgs.asm
+++ b/joeylib/src/jIIgs.asm
@@ -881,6 +881,7 @@ asmGetPoint	start
 temp1	equ	1
 
 	jsubroutine (4:surface,2:Xp,2:Yp),2
+	using GlobalData
 
 	lda	Yp	; Load accumulator with Y location
 	asl	a	; Shift accumulator left (multiply by 2) for word offset into table
diff --git a/joeylib/src/test.c b/joeylib/src/test.c
index e060a07..8c236be 100644
--- a/joeylib/src/test.c
+++ b/joeylib/src/test.c
@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdarg.h>
+#include <assert.h>
 
 
 #define JOEY_MAIN
@@ -155,7 +156,19 @@ void blitTest(void) {
 }
 
 
-void grid() {
+void exerciseAPI(void) {
+
+	jlDrawColorSet(0);
+	jlDrawClear();
+	jlDrawColorSet(15);
+
+	jlDrawPixelSet(10, 10);
+	assert(jlDrawPixelGet(10, 10) == 15);
+
+}
+
+
+void grid(void) {
 	int i;
 
 	jlDrawColorSet(0);
@@ -283,7 +296,8 @@ int main(void) {
 	jlUtilStartup("JoeyLib Test");
 
 	//blitTest();
-	grid();
+	exerciseAPI();
+	//grid();
 	//lineTest();
 
 	jlUtilShutdown();