diff --git a/src/main/kc/include/conio.h b/src/main/kc/include/conio.h
index caf43c900..0fc7d0182 100644
--- a/src/main/kc/include/conio.h
+++ b/src/main/kc/include/conio.h
@@ -1,6 +1,9 @@
 // Provides provide console input/output
 // Implements similar functions as conio.h from CC65 for compatibility
 // See https://github.com/cc65/cc65/blob/master/include/conio.h
+//
+// Currently only the C64 platform is supported
+
 
 // clears the screen and moves the cursor to the upper left-hand corner of the screen.
 void clrscr(void);
@@ -17,6 +20,12 @@ unsigned char wherey(void);
 // Return the current screen size.
 void screensize(unsigned char* x, unsigned char* y);
 
+// Return the current screen size X width.
+char screensizex();
+
+// Return the current screen size Y height.
+char screensizey();
+
 // Output one character at the current cursor position
 void cputc(char c);
 
@@ -58,7 +67,6 @@ unsigned char kbhit (void);
 // The function returns the old cursor setting.
 unsigned char cursor(unsigned char onoff);
 
-
 // The horizontal line character
 const char CH_HLINE = 0x40;
 // The vertical line character
diff --git a/src/main/kc/lib/conio.c b/src/main/kc/lib/conio.c
index 07f98c5ab..91a563e52 100644
--- a/src/main/kc/lib/conio.c
+++ b/src/main/kc/lib/conio.c
@@ -1,6 +1,8 @@
 // Provides provide console input/output
 // Implements similar functions as conio.h from CC65 for compatibility
 // See https://github.com/cc65/cc65/blob/master/include/conio.h
+//
+// Currently only the C64 platform is supported
 #include <conio.h>
 
 // The text screen address
@@ -71,6 +73,16 @@ void screensize(unsigned char* x, unsigned char* y) {
     *y = CONIO_HEIGHT;
 }
 
+// Return the current screen size X width.
+inline char screensizex() {
+    return CONIO_WIDTH;
+}
+
+// Return the current screen size Y height.
+inline char screensizey() {
+    return CONIO_HEIGHT;
+}
+
 // Return the X position of the cursor
 inline unsigned char wherex(void) {
     return conio_cursor_x;
@@ -159,8 +171,7 @@ unsigned char bgcolor(unsigned char color) {
 }
 
 // Set the color for the border. The old color setting is returned.
-unsigned char bordercolor(unsigned char color)
-{
+unsigned char bordercolor(unsigned char color) {
     char old = *CONIO_BORDERCOLOR;
     *CONIO_BORDERCOLOR = color;
     return old;
diff --git a/src/test/ref/examples/conio/nacht-screen.log b/src/test/ref/examples/conio/nacht-screen.log
index df8462544..9158793ff 100644
--- a/src/test/ref/examples/conio/nacht-screen.log
+++ b/src/test/ref/examples/conio/nacht-screen.log
@@ -22,43 +22,45 @@ Culled Empty Block (label) @2
 Culled Empty Block (label) @3
 Culled Empty Block (label) @4
 Culled Empty Block (label) @5
+Culled Empty Block (label) @6
+Culled Empty Block (label) @7
 Culled Empty Block (label) cputc::@6
 Culled Empty Block (label) cputc::@7
 Culled Empty Block (label) cputc::@2
 Culled Empty Block (label) cputc::@8
-Culled Empty Block (label) @6
-Culled Empty Block (label) @7
+Culled Empty Block (label) @8
+Culled Empty Block (label) @9
 Culled Empty Block (label) cputs::@4
 Culled Empty Block (label) cputs::@3
 Culled Empty Block (label) cputs::@5
 Culled Empty Block (label) cputs::@6
-Culled Empty Block (label) @8
-Culled Empty Block (label) @9
+Culled Empty Block (label) @10
+Culled Empty Block (label) @11
 Culled Empty Block (label) chline::@4
 Culled Empty Block (label) chline::@3
 Culled Empty Block (label) chline::@5
 Culled Empty Block (label) chline::@6
-Culled Empty Block (label) @10
+Culled Empty Block (label) @12
 Culled Empty Block (label) cvline::@4
 Culled Empty Block (label) cvline::@3
 Culled Empty Block (label) cvline::@5
 Culled Empty Block (label) cvline::@6
-Culled Empty Block (label) @11
-Culled Empty Block (label) @12
-Culled Empty Block (label) textcolor::@1
 Culled Empty Block (label) @13
-Culled Empty Block (label) bgcolor::@1
 Culled Empty Block (label) @14
-Culled Empty Block (label) bordercolor::@1
+Culled Empty Block (label) textcolor::@1
 Culled Empty Block (label) @15
-Culled Empty Block (label) kbhit::@1
+Culled Empty Block (label) bgcolor::@1
 Culled Empty Block (label) @16
-Culled Empty Block (label) cursor::@1
+Culled Empty Block (label) bordercolor::@1
 Culled Empty Block (label) @17
+Culled Empty Block (label) kbhit::@1
 Culled Empty Block (label) @18
+Culled Empty Block (label) cursor::@1
 Culled Empty Block (label) @19
 Culled Empty Block (label) @20
 Culled Empty Block (label) @21
+Culled Empty Block (label) @22
+Culled Empty Block (label) @23
 Culled Empty Block (label) strlen::@4
 Culled Empty Block (label) strlen::@5
 Culled Empty Block (label) strlen::@6
@@ -67,8 +69,8 @@ Culled Empty Block (label) main::@2
 Culled Empty Block (label) main::@4
 Culled Empty Block (label) main::@5
 Culled Empty Block (label) main::@6
-Culled Empty Block (label) @23
-Culled Empty Block (label) @24
+Culled Empty Block (label) @25
+Culled Empty Block (label) @26
 Culled Empty Block (label) MakeNiceScreen::@4
 Culled Empty Block (label) MakeNiceScreen::@3
 Culled Empty Block (label) MakeNiceScreen::@5
@@ -82,7 +84,7 @@ CONTROL FLOW GRAPH SSA
   (byte*) conio_cursor_color#0 ← (const nomodify byte*) CONIO_SCREEN_COLORS
   (byte) conio_textcolor#0 ← (const nomodify byte) CONIO_TEXTCOLOR_DEFAULT
   (byte) conio_display_cursor#0 ← (byte) 0
-  to:@22
+  to:@24
 
 (void()) clrscr()
 clrscr: scope:[clrscr]  from MakeNiceScreen::@9 main::@3
@@ -747,7 +749,7 @@ strlen::@return: scope:[strlen]  from strlen::@3
   (word) strlen::return#1 ← (word) strlen::return#3
   return 
   to:@return
-@22: scope:[]  from @begin
+@24: scope:[]  from @begin
   (byte) conio_display_cursor#25 ← phi( @begin/(byte) conio_display_cursor#0 )
   (byte*) conio_cursor_color#117 ← phi( @begin/(byte*) conio_cursor_color#0 )
   (byte*) conio_cursor_text#117 ← phi( @begin/(byte*) conio_cursor_text#0 )
@@ -756,16 +758,16 @@ strlen::@return: scope:[strlen]  from strlen::@3
   (byte) conio_textcolor#37 ← phi( @begin/(byte) conio_textcolor#0 )
   (volatile byte) XSize ← (byte) 0
   (volatile byte) YSize ← (byte) 0
-  to:@25
+  to:@27
 
 (void()) main()
-main: scope:[main]  from @25
-  (byte) conio_display_cursor#20 ← phi( @25/(byte) conio_display_cursor#19 )
-  (byte*) conio_cursor_color#113 ← phi( @25/(byte*) conio_cursor_color#109 )
-  (byte*) conio_cursor_text#113 ← phi( @25/(byte*) conio_cursor_text#109 )
-  (byte) conio_cursor_y#113 ← phi( @25/(byte) conio_cursor_y#110 )
-  (byte) conio_cursor_x#113 ← phi( @25/(byte) conio_cursor_x#110 )
-  (byte) conio_textcolor#33 ← phi( @25/(byte) conio_textcolor#23 )
+main: scope:[main]  from @27
+  (byte) conio_display_cursor#20 ← phi( @27/(byte) conio_display_cursor#19 )
+  (byte*) conio_cursor_color#113 ← phi( @27/(byte*) conio_cursor_color#109 )
+  (byte*) conio_cursor_text#113 ← phi( @27/(byte*) conio_cursor_text#109 )
+  (byte) conio_cursor_y#113 ← phi( @27/(byte) conio_cursor_y#110 )
+  (byte) conio_cursor_x#113 ← phi( @27/(byte) conio_cursor_x#110 )
+  (byte) conio_textcolor#33 ← phi( @27/(byte) conio_textcolor#23 )
   *((const nomodify byte*) VIC_MEMORY) ← (number) $17
   (byte*) screensize::x#0 ← &(volatile byte) XSize
   (byte*) screensize::y#0 ← &(volatile byte) YSize
@@ -1219,22 +1221,22 @@ MakeNiceScreen::@return: scope:[MakeNiceScreen]  from MakeNiceScreen::@1
   (byte) conio_display_cursor#6 ← (byte) conio_display_cursor#13
   return 
   to:@return
-@25: scope:[]  from @22
-  (byte) conio_display_cursor#19 ← phi( @22/(byte) conio_display_cursor#25 )
-  (byte*) conio_cursor_color#109 ← phi( @22/(byte*) conio_cursor_color#117 )
-  (byte*) conio_cursor_text#109 ← phi( @22/(byte*) conio_cursor_text#117 )
-  (byte) conio_cursor_y#110 ← phi( @22/(byte) conio_cursor_y#117 )
-  (byte) conio_cursor_x#110 ← phi( @22/(byte) conio_cursor_x#117 )
-  (byte) conio_textcolor#23 ← phi( @22/(byte) conio_textcolor#37 )
+@27: scope:[]  from @24
+  (byte) conio_display_cursor#19 ← phi( @24/(byte) conio_display_cursor#25 )
+  (byte*) conio_cursor_color#109 ← phi( @24/(byte*) conio_cursor_color#117 )
+  (byte*) conio_cursor_text#109 ← phi( @24/(byte*) conio_cursor_text#117 )
+  (byte) conio_cursor_y#110 ← phi( @24/(byte) conio_cursor_y#117 )
+  (byte) conio_cursor_x#110 ← phi( @24/(byte) conio_cursor_x#117 )
+  (byte) conio_textcolor#23 ← phi( @24/(byte) conio_textcolor#37 )
   call main 
-  to:@26
-@26: scope:[]  from @25
-  (byte) conio_display_cursor#14 ← phi( @25/(byte) conio_display_cursor#4 )
-  (byte*) conio_cursor_color#88 ← phi( @25/(byte*) conio_cursor_color#27 )
-  (byte*) conio_cursor_text#88 ← phi( @25/(byte*) conio_cursor_text#27 )
-  (byte) conio_cursor_y#90 ← phi( @25/(byte) conio_cursor_y#27 )
-  (byte) conio_cursor_x#90 ← phi( @25/(byte) conio_cursor_x#28 )
-  (byte) conio_textcolor#16 ← phi( @25/(byte) conio_textcolor#4 )
+  to:@28
+@28: scope:[]  from @27
+  (byte) conio_display_cursor#14 ← phi( @27/(byte) conio_display_cursor#4 )
+  (byte*) conio_cursor_color#88 ← phi( @27/(byte*) conio_cursor_color#27 )
+  (byte*) conio_cursor_text#88 ← phi( @27/(byte*) conio_cursor_text#27 )
+  (byte) conio_cursor_y#90 ← phi( @27/(byte) conio_cursor_y#27 )
+  (byte) conio_cursor_x#90 ← phi( @27/(byte) conio_cursor_x#28 )
+  (byte) conio_textcolor#16 ← phi( @27/(byte) conio_textcolor#4 )
   (byte) conio_textcolor#7 ← (byte) conio_textcolor#16
   (byte) conio_cursor_x#46 ← (byte) conio_cursor_x#90
   (byte) conio_cursor_y#45 ← (byte) conio_cursor_y#90
@@ -1242,14 +1244,14 @@ MakeNiceScreen::@return: scope:[MakeNiceScreen]  from MakeNiceScreen::@1
   (byte*) conio_cursor_color#45 ← (byte*) conio_cursor_color#88
   (byte) conio_display_cursor#7 ← (byte) conio_display_cursor#14
   to:@end
-@end: scope:[]  from @26
+@end: scope:[]  from @28
 
 SYMBOL TABLE SSA
 (const byte*) $0::Msg[(number) $28]  = { fill( $28, 0) }
 (byte) $0::Y
-(label) @22
-(label) @25
-(label) @26
+(label) @24
+(label) @27
+(label) @28
 (label) @begin
 (label) @end
 (const nomodify byte) CH_HLINE = (byte) $40
@@ -3107,8 +3109,8 @@ Added new block during phi lifting cputc::@11(between cputc::@3 and cputc::@retu
 Added new block during phi lifting cputc::@12(between cputc::@4 and cputc::@return)
 Fixing phi predecessor for conio_cursor_x#52 to new block ( cputc::@4 -> cputc::@12 ) during phi lifting.
 Adding NOP phi() at start of @begin
-Adding NOP phi() at start of @25
-Adding NOP phi() at start of @26
+Adding NOP phi() at start of @27
+Adding NOP phi() at start of @28
 Adding NOP phi() at start of @end
 Adding NOP phi() at start of main::@7
 Adding NOP phi() at start of main::@8
@@ -3242,7 +3244,7 @@ Coalesced [255] gotoxy::y#14 ← gotoxy::y#5
 Coalesced [258] cvline::i#6 ← cvline::i#1
 Coalesced [259] cvline::y#7 ← cvline::y#1
 Coalesced down to 24 phi equivalence classes
-Culled Empty Block (label) @26
+Culled Empty Block (label) @28
 Culled Empty Block (label) main::@8
 Culled Empty Block (label) main::@10
 Culled Empty Block (label) clrscr::@3
@@ -3260,8 +3262,8 @@ Culled Empty Block (label) strlen::@3
 Culled Empty Block (label) MakeTeeLine::@3
 Culled Empty Block (label) cputcxy::@2
 Culled Empty Block (label) cvlinexy::@2
-Renumbering block @22 to @1
-Renumbering block @25 to @2
+Renumbering block @24 to @1
+Renumbering block @27 to @2
 Renumbering block clrscr::@4 to clrscr::@2
 Renumbering block clrscr::@5 to clrscr::@3
 Renumbering block clrscr::@6 to clrscr::@4