diff --git a/compiler/res/prog8lib/c64floats.asm b/compiler/res/prog8lib/c64floats.asm
index e13e50354..822b7ac26 100644
--- a/compiler/res/prog8lib/c64floats.asm
+++ b/compiler/res/prog8lib/c64floats.asm
@@ -8,7 +8,8 @@ ub2float	.proc
 		sta  P8ZP_SCRATCH_W2
 		sty  P8ZP_SCRATCH_W2+1
 		ldy  P8ZP_SCRATCH_B1
-		jsr  FREADUY
+		lda  #0
+		jsr  GIVAYF
 _fac_to_mem	ldx  P8ZP_SCRATCH_W2
 		ldy  P8ZP_SCRATCH_W2+1
 		jsr  MOVMF
@@ -74,7 +75,8 @@ stack_ub2float	.proc
 		lda  P8ESTACK_LO,x
 		stx  P8ZP_SCRATCH_REG_X
 		tay
-		jsr  FREADUY
+		lda  #0
+		jsr  GIVAYF
 		jmp  push_fac1_as_result
 		.pend
 
@@ -663,8 +665,8 @@ _largest_pos_float	.byte  255,127,255,255,255		; largest positive float
 		.pend
 
 func_sum_f	.proc
-		lda  #<FL_ZERO
-		ldy  #>FL_ZERO
+		lda  #<ZERO
+		ldy  #>ZERO
 		jsr  MOVFM
 		jsr  prog8_lib.pop_array_and_lengthmin1Y
 		stx  P8ZP_SCRATCH_REG_X
diff --git a/compiler/res/prog8lib/c64flt.p8 b/compiler/res/prog8lib/c64flt.p8
index bce969932..83f9ee453 100644
--- a/compiler/res/prog8lib/c64flt.p8
+++ b/compiler/res/prog8lib/c64flt.p8
@@ -6,12 +6,12 @@
 
 %option enable_floats
 
-
 c64flt {
 	; ---- this block contains C-64 floating point related functions ----
 
         const  float  PI        = 3.141592653589793
         const  float  TWOPI	    = 6.283185307179586
+        const  float  ZERO      = 0.0
 
 
 ; ---- C64 basic and kernal ROM float constants and functions ----
@@ -35,13 +35,11 @@ c64flt {
 		&float  FL_TWOPI	= $e2e5  ; 2 * PI
 		&float  FL_FR4		= $e2ea  ; .25
 		; oddly enough, 0.0 isn't available in the kernel.
-        float   FL_ZERO     = 0.0    ; oddly enough 0.0 isn't available in the kernel
 
 
 ; note: fac1/2 might get clobbered even if not mentioned in the function's name.
 ; note: for subtraction and division, the left operand is in fac2, the right operand in fac1.
 
-; checked functions below:
 romsub $bba2 = MOVFM(uword mflpt @ AY) clobbers(A,Y)        ; load mflpt value from memory  in A/Y into fac1
 romsub $bba6 = FREADMEM() clobbers(A,Y)                     ; load mflpt value from memory  in $22/$23 into fac1
 romsub $ba8c = CONUPK(uword mflpt @ AY) clobbers(A,Y)       ; load mflpt value from memory  in A/Y into fac2
@@ -91,6 +89,7 @@ romsub $bb12 = FDIVT() clobbers(A,X,Y)                      ; fac1 = fac2/fac1
 romsub $bb0f = FDIV(uword mflpt @ AY) clobbers(A,X,Y)       ; fac1 = mflpt in A/Y / fac1  (remainder in fac2)
 romsub $bf7b = FPWRT() clobbers(A,X,Y)                      ; fac1 = fac2 ** fac1
 romsub $bf78 = FPWR(uword mflpt @ AY) clobbers(A,X,Y)       ; fac1 = fac2 ** mflpt from A/Y
+romsub $bd7e = FINLOG(byte value @A) clobbers (A, X, Y)     ; fac1 += signed byte in A
 
 romsub $aed4 = NOTOP() clobbers(A,X,Y)                      ; fac1 = NOT(fac1)
 romsub $bccc = INT() clobbers(A,X,Y)                        ; INT() truncates, use FADDH first to round instead of trunc
@@ -193,33 +192,26 @@ asmsub  GETADRAY  () clobbers(X) -> uword @ AY  {
 }
 
 sub  print_f  (float value) {
-	; ---- prints the floating point value (without a newline) using basic rom routines.
+	; ---- prints the floating point value (without a newline).
 	%asm {{
 		stx  P8ZP_SCRATCH_REG_X
 		lda  #<value
 		ldy  #>value
 		jsr  MOVFM		; load float into fac1
 		jsr  FOUT		; fac1 to string in A/Y
-		jsr  c64.STROUT			; print string in A/Y
+		sta  P8ZP_SCRATCH_B1
+		sty  P8ZP_SCRATCH_REG
+		ldy  #0
+-		lda  (P8ZP_SCRATCH_B1),y
+		beq  +
+		jsr  c64.CHROUT
+		iny
+		bne  -
 		ldx  P8ZP_SCRATCH_REG_X
-		rts
++		rts
 	}}
 }
 
-sub  print_fln  (float value) {
-	; ---- prints the floating point value (with a newline at the end) using basic rom routines
-	%asm {{
-		stx  P8ZP_SCRATCH_REG_X
-		lda  #<value
-		ldy  #>value
-		jsr  MOVFM		; load float into fac1
-		jsr  FPRINTLN		; print fac1 with newline
-		ldx  P8ZP_SCRATCH_REG_X
-		rts
-	}}
-
-}
-
 %asminclude "library:c64floats.asm", ""
 
-}  ; ------ end of block c64flt
+}
diff --git a/compiler/res/prog8lib/cx16flt.p8 b/compiler/res/prog8lib/cx16flt.p8
new file mode 100644
index 000000000..f29dab1e4
--- /dev/null
+++ b/compiler/res/prog8lib/cx16flt.p8
@@ -0,0 +1,140 @@
+; Prog8 definitions for floating point handling on the CommanderX16
+;
+; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
+;
+; indent format: TABS, size=8
+
+%option enable_floats
+
+c64flt {
+	; ---- this block contains C-64 floating point related functions ----
+
+        const  float  PI        = 3.141592653589793
+        const  float  TWOPI	    = 6.283185307179586
+        const  float  ZERO      = 0.0
+
+
+; ---- ROM float functions ----
+
+		; note: the fac1 and fac2 are working registers and take 6 bytes each,
+		; floats in memory  (and rom) are stored in 5-byte MFLPT packed format.
+
+; note: fac1/2 might get clobbered even if not mentioned in the function's name.
+; note: for subtraction and division, the left operand is in fac2, the right operand in fac1.
+
+romsub $fe00 = AYINT() clobbers(A,X,Y)          ; fac1-> signed word in 100-101 ($64-$65) MSB FIRST. (might throw ILLEGAL QUANTITY)
+
+; GIVAYF: signed word in Y/A (note different lsb/msb order) -> float in fac1
+; there is also c64flt.GIVUAYFAY - unsigned word in A/Y (lo/hi) to fac1
+; (tip: use GIVAYFAY to use A/Y input; lo/hi switched to normal order)
+romsub $fe03 = GIVAYF(ubyte lo @ Y, ubyte hi @ A) clobbers(A,X,Y)
+
+; fac1 -> unsigned word in Y/A (might throw ILLEGAL QUANTITY) (result also in $14/15)
+; (tip: use GETADRAY to get A/Y output; lo/hi switched to normal little endian order)
+romsub $fe06 = GETADR() clobbers(X) -> ubyte @ Y, ubyte @ A
+
+romsub $fe09 = FADDH() clobbers(A,X,Y)                      ; fac1 += 0.5, for rounding- call this before INT
+romsub $fe0c = FSUB(uword mflpt @ AY) clobbers(A,X,Y)       ; fac1 = mflpt from A/Y - fac1
+romsub $fe0f = FSUBT() clobbers(A,X,Y)                      ; fac1 = fac2-fac1   mind the order of the operands
+romsub $fe12 = FADD(uword mflpt @ AY) clobbers(A,X,Y)       ; fac1 += mflpt value from A/Y
+romsub $fe15 = FADDT() clobbers(A,X,Y)                      ; fac1 += fac2
+romsub $fe1b = ZEROFC() clobbers(A,X,Y)                     ; fac1 = 0
+romsub $fe1e = NORMAL() clobbers(A,X,Y)                     ; normalize fac1 (?)
+romsub $fe24 = LOG() clobbers(A,X,Y)                        ; fac1 = LN(fac1)  (natural log)
+romsub $fe27 = FMULT(uword mflpt @ AY) clobbers(A,X,Y)      ; fac1 *= mflpt value from A/Y
+romsub $fe2a = FMULTT() clobbers(A,X,Y)                     ; fac1 *= fac2
+romsub $fe33 = CONUPK(uword mflpt @ AY) clobbers(A,Y)       ; load mflpt value from memory  in A/Y into fac2
+romsub $fe36 = MUL10() clobbers(A,X,Y)                      ; fac1 *= 10
+romsub $fe3c = DIV10() clobbers(A,X,Y)                      ; fac1 /= 10 , CAUTION: result is always positive!
+romsub $fe3f = FDIV(uword mflpt @ AY) clobbers(A,X,Y)       ; fac1 = mflpt in A/Y / fac1  (remainder in fac2)
+romsub $fe42 = FDIVT() clobbers(A,X,Y)                      ; fac1 = fac2/fac1  (remainder in fac2)  mind the order of the operands
+
+romsub $fe48 = MOVFM(uword mflpt @ AY) clobbers(A,Y)        ; load mflpt value from memory  in A/Y into fac1
+romsub $fe4b = MOVMF(uword mflpt @ XY) clobbers(A,Y)        ; store fac1 to memory  X/Y as 5-byte mflpt
+romsub $fe4e = MOVFA() clobbers(A,X)                        ; copy fac2 to fac1
+romsub $fe51 = MOVAF() clobbers(A,X)                        ; copy fac1 to fac2  (rounded)
+romsub $fe54 = MOVEF() clobbers(A,X)                        ; copy fac1 to fac2
+romsub $fe5a = SIGN() -> ubyte @ A                          ; SIGN(fac1) to A, $ff, $0, $1 for negative, zero, positive
+romsub $fe5d = SGN() clobbers(A,X,Y)                        ; fac1 = SGN(fac1), result of SIGN (-1, 0 or 1)
+romsub $fe60 = FREADSA(byte value @ A) clobbers(A,X,Y)      ; 8 bit signed A -> float in fac1
+romsub $fe6c = ABS()                                        ; fac1 = ABS(fac1)
+romsub $fe6f = FCOMP(uword mflpt @ AY) clobbers(X,Y) -> ubyte @ A   ; A = compare fac1 to mflpt in A/Y, 0=equal 1=fac1 is greater, 255=fac1 is less than
+romsub $fe78 = INT() clobbers(A,X,Y)                        ; INT() truncates, use FADDH first to round instead of trunc
+romsub $fe7e = FINLOG(byte value @A) clobbers (A, X, Y)           ; fac1 += signed byte in A
+romsub $fe81 = FOUT() clobbers(X) -> uword @ AY             ; fac1 -> string, address returned in AY ($0100)
+romsub $fe8a = SQR() clobbers(A,X,Y)                        ; fac1 = SQRT(fac1)
+romsub $fe8d = FPWRT() clobbers(A,X,Y)                      ; fac1 = fac2 ** fac1
+romsub $fe93 = NEGOP() clobbers(A)                          ; switch the sign of fac1
+romsub $fe96 = EXP() clobbers(A,X,Y)                        ; fac1 = EXP(fac1)  (e ** fac1)
+romsub $fe9f = RND2(byte value @A) clobbers(A,X,Y)                ; fac1 = RND(A) float random number generator
+romsub $fea2 = RND() clobbers(A,X,Y)                        ; fac1 = RND(fac1) float random number generator
+romsub $fea5 = COS() clobbers(A,X,Y)                        ; fac1 = COS(fac1)
+romsub $fea8 = SIN() clobbers(A,X,Y)                        ; fac1 = SIN(fac1)
+romsub $feab = TAN() clobbers(A,X,Y)                        ; fac1 = TAN(fac1)
+romsub $feae = ATN() clobbers(A,X,Y)                        ; fac1 = ATN(fac1)
+
+
+asmsub  GIVUAYFAY  (uword value @ AY) clobbers(A,X,Y)  {
+	; ---- unsigned 16 bit word in A/Y (lo/hi) to fac1
+	%asm {{
+	    jmp  GIVAYFAY       ; TODO make this work for unsigned!!
+	}}
+}
+
+
+asmsub  GIVAYFAY  (uword value @ AY) clobbers(A,X,Y)  {
+	; ---- signed 16 bit word in A/Y (lo/hi) to float in fac1
+	%asm {{
+		sta  P8ZP_SCRATCH_REG
+		tya
+		ldy  P8ZP_SCRATCH_REG
+		jmp  GIVAYF		; this uses the inverse order, Y/A
+	}}
+}
+
+asmsub  FTOSWRDAY  () clobbers(X) -> uword @ AY  {
+	; ---- fac1 to signed word in A/Y
+	%asm {{
+		jsr  FTOSWORDYA	; note the inverse Y/A order
+		sta  P8ZP_SCRATCH_REG
+		tya
+		ldy  P8ZP_SCRATCH_REG
+		rts
+	}}
+}
+
+asmsub  GETADRAY  () clobbers(X) -> uword @ AY  {
+	; ---- fac1 to unsigned word in A/Y
+	%asm {{
+		jsr  GETADR		; this uses the inverse order, Y/A
+		sta  P8ZP_SCRATCH_B1
+		tya
+		ldy  P8ZP_SCRATCH_B1
+		rts
+	}}
+}
+
+sub  print_f  (float value) {
+	; ---- prints the floating point value (without a newline).
+	%asm {{
+		stx  P8ZP_SCRATCH_REG_X
+		lda  #<value
+		ldy  #>value
+		jsr  MOVFM		; load float into fac1
+		jsr  FOUT		; fac1 to string in A/Y
+		sta  P8ZP_SCRATCH_B1
+		sty  P8ZP_SCRATCH_REG
+		ldy  #0
+-		lda  (P8ZP_SCRATCH_B1),y
+		beq  +
+		jsr  c64.CHROUT
+		iny
+		bne  -
+		ldx  P8ZP_SCRATCH_REG_X
++		rts
+	}}
+}
+
+%asminclude "library:c64floats.asm", ""
+
+}
diff --git a/compiler/res/prog8lib/cx16textio.p8 b/compiler/res/prog8lib/cx16textio.p8
index b2628275c..f32084d5e 100644
--- a/compiler/res/prog8lib/cx16textio.p8
+++ b/compiler/res/prog8lib/cx16textio.p8
@@ -11,7 +11,7 @@
 
 txt {
 
-asmsub  clear_screen (ubyte char @ A, ubyte color @ Y) clobbers(A)  {
+asmsub  clear_screen (ubyte char @ A, ubyte txtcolor @ Y) clobbers(A)  {
 	; ---- clear the character screen with the given fill character and character color.
 
 	%asm {{
@@ -224,6 +224,32 @@ asmsub  print_w  (word value @ AY) clobbers(A,Y)  {
 	}}
 }
 
+ubyte[16] color_to_charcode = [$90,$05,$1c,$9f,$9c,$1e,$1f,$9e,$81,$95,$96,$97,$98,$99,$9a,$9b]
+
+sub color (ubyte txtcol) {
+    c64.CHROUT(color_to_charcode[txtcol & 15])
+}
+
+sub color2 (ubyte txtcol, ubyte bgcol) {
+    c64.CHROUT(color_to_charcode[bgcol & 15])
+    c64.CHROUT(1)       ; switch fg and bg colors
+    c64.CHROUT(color_to_charcode[txtcol & 15])
+}
+
+sub  setc  (ubyte column, ubyte row, ubyte char)  {
+	; ---- set char at the given position on the screen
+	%asm {{
+		phx
+		ldy  column
+		ldx  row
+		clc
+		jsr  c64.PLOT
+		plx
+		lda  char
+		jmp  c64.CHROUT
+	}}
+}
+
 asmsub  plot  (ubyte col @ Y, ubyte row @ A) clobbers(A) {
 	; ---- safe wrapper around PLOT kernel routine, to save the X register.
 	%asm  {{
diff --git a/compiler/src/prog8/compiler/target/c64/codegen/AsmOptimizer.kt b/compiler/src/prog8/compiler/target/c64/codegen/AsmOptimizer.kt
index 7bce66478..983d14106 100644
--- a/compiler/src/prog8/compiler/target/c64/codegen/AsmOptimizer.kt
+++ b/compiler/src/prog8/compiler/target/c64/codegen/AsmOptimizer.kt
@@ -151,7 +151,8 @@ private fun optimizeSameAssignments(linesByFourteen: List<List<IndexedValue<Stri
         }
 
         if(first.startsWith("lda") && second.startsWith("ldy") && third.startsWith("sta") && fourth.startsWith("sty") &&
-                fifth.startsWith("lda") && sixth.startsWith("ldy") && seventh.startsWith("jsr  c64flt.copy_float")) {
+                fifth.startsWith("lda") && sixth.startsWith("ldy") &&
+                (seventh.startsWith("jsr  c64flt.copy_float") || seventh.startsWith("jsr  cx16flt.copy_float"))) {
 
             val nineth = pair[8].value.trimStart()
             val tenth = pair[9].value.trimStart()
@@ -161,7 +162,8 @@ private fun optimizeSameAssignments(linesByFourteen: List<List<IndexedValue<Stri
             val fourteenth = pair[13].value.trimStart()
 
             if(eighth.startsWith("lda") && nineth.startsWith("ldy") && tenth.startsWith("sta") && eleventh.startsWith("sty") &&
-                    twelveth.startsWith("lda") && thirteenth.startsWith("ldy") && fourteenth.startsWith("jsr  c64flt.copy_float")) {
+                    twelveth.startsWith("lda") && thirteenth.startsWith("ldy") &&
+                    (fourteenth.startsWith("jsr  c64flt.copy_float") || fourteenth.startsWith("jsr  cx16flt.copy_float"))) {
 
                 if(first.substring(4) == eighth.substring(4) && second.substring(4)==nineth.substring(4)) {
                     // identical float init
diff --git a/examples/cx16/floats.p8 b/examples/cx16/floats.p8
new file mode 100644
index 000000000..fd7a78b4a
--- /dev/null
+++ b/examples/cx16/floats.p8
@@ -0,0 +1,23 @@
+; CommanderX16 floating point example!
+; make sure to compile with the cx16 compiler target.
+
+%import cx16textio
+%import cx16flt
+%zeropage basicsafe
+
+main {
+
+    sub start() {
+        float f1 = 5.55
+        float f2 = 33.3
+        float f3 = f1 * f2
+
+        c64flt.print_f(f1)
+        c64.CHROUT('*')
+        c64flt.print_f(f2)
+        c64.CHROUT('=')
+        c64flt.print_f(f3)
+        c64.CHROUT('\n')
+    }
+}
+
diff --git a/examples/cx16/graphics.p8 b/examples/cx16/graphics.p8
index 293f02088..bd6cdefa8 100644
--- a/examples/cx16/graphics.p8
+++ b/examples/cx16/graphics.p8
@@ -7,7 +7,7 @@ main {
 
     sub start() {
 
-        cx16.screen_set_mode($80)
+        void cx16.screen_set_mode($80)
         cx16.r0=0
 
         cx16.FB_init()
@@ -17,24 +17,23 @@ main {
         uword xx
         ubyte yy
         for yy in 199 downto 0 {
-            for xx in 319 downto 0 {            ; TODO fix compiler hang -- should be error message when range is too large
+            for xx in 319 downto 0 {
                 cx16.FB_set_pixel( yy+lsb(xx))
             }
         }
 
-;        uword xx
-;        for xx in 0 to 319 step 32 {
-;            cx16.GRAPH_clear()
-;            ubyte q
-;            for q in 0 to 31 {
-;                cx16.GRAPH_set_colors(q, 2, 0)
-;                cx16.r0 = xx+q
-;                cx16.r1=0
-;                cx16.r2=rnd()
-;                cx16.r3=199
-;                cx16.GRAPH_draw_line()
-;            }
-;        }
+        ; cx16.GRAPH_init()
+        for xx in 0 to 319 step 32 {
+            ubyte q
+            for q in 0 to 31 {
+                cx16.GRAPH_set_colors(q, 2, 0)
+                cx16.r0 = xx+q
+                cx16.r1=0
+                cx16.r2=rnd()
+                cx16.r3=199
+                cx16.GRAPH_draw_line()
+            }
+        }
     }
 }
 
diff --git a/examples/cx16/mandelbrot-gfx.p8 b/examples/cx16/mandelbrot-gfx.p8
new file mode 100644
index 000000000..851758eee
--- /dev/null
+++ b/examples/cx16/mandelbrot-gfx.p8
@@ -0,0 +1,45 @@
+%import cx16flt
+%zeropage basicsafe
+
+main {
+    const uword width = 256
+    const uword height = 200
+    const ubyte max_iter = 16
+
+    sub start()  {
+
+        void cx16.screen_set_mode($80)
+        cx16.r0=0
+        cx16.FB_init()
+
+        ubyte pixelx
+        ubyte pixely
+
+        for pixely in 0 to height-1 {
+            float yy = (pixely as float)/0.4/height - 1.0
+
+            cx16.r0 = 0
+            cx16.r1 = pixely
+            cx16.FB_cursor_position()
+
+            for pixelx in 0 to width-1 {
+                float xx = (pixelx as float)/0.3/width - 2.2
+
+                float xsquared = 0.0
+                float ysquared = 0.0
+                float x = 0.0
+                float y = 0.0
+                ubyte iter = 0
+
+                while iter<max_iter and xsquared+ysquared<4.0 {
+                    y = x*y*2.0 + yy
+                    x = xsquared - ysquared + xx
+                    xsquared = x*x
+                    ysquared = y*y
+                    iter++
+                }
+                cx16.FB_set_pixel(max_iter-iter)
+            }
+        }
+    }
+}
diff --git a/examples/cx16/mandelbrot.p8 b/examples/cx16/mandelbrot.p8
new file mode 100644
index 000000000..0c00b602b
--- /dev/null
+++ b/examples/cx16/mandelbrot.p8
@@ -0,0 +1,42 @@
+%import cx16textio
+%import cx16flt
+%zeropage basicsafe
+
+main {
+    const uword width = 60
+    const uword height = 50
+    const ubyte max_iter = 16
+
+    sub start()  {
+        txt.print("calculating mandelbrot fractal...\n\n")
+
+        ubyte pixelx
+        ubyte pixely
+
+        for pixely in 0 to height-1 {
+            float yy = (pixely as float)/0.4/height - 1.0
+
+            for pixelx in 0 to width-1 {
+                float xx = (pixelx as float)/0.3/width - 2.2
+
+                float xsquared = 0.0
+                float ysquared = 0.0
+                float x = 0.0
+                float y = 0.0
+                ubyte iter = 0
+
+                while iter<max_iter and xsquared+ysquared<4.0 {
+                    y = x*y*2.0 + yy
+                    x = xsquared - ysquared + xx
+                    xsquared = x*x
+                    ysquared = y*y
+                    iter++
+                }
+
+                txt.color2(1, max_iter-iter)
+                c64.CHROUT(' ')
+            }
+            c64.CHROUT('\n')
+        }
+    }
+}
diff --git a/examples/romfloats.p8 b/examples/romfloats.p8
index c972c63cd..f6d5dda64 100644
--- a/examples/romfloats.p8
+++ b/examples/romfloats.p8
@@ -4,8 +4,47 @@
 main {
 
     sub start() {
+        print_rom_floats_values()
+       	c64.CHROUT('\n')
+        print_rom_floats()
+       	c64.CHROUT('\n')
+    }
 
+    sub print_rom_floats() {
+        c64flt.FL_PIVAL=9.9999
+    	c64flt.print_f(c64flt.FL_PIVAL)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_N32768)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_FONE)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_SQRHLF)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_SQRTWO)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_NEGHLF)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_LOG2)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_TENC)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_NZMIL)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_FHALF)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_LOGEB2)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_PIHALF)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_TWOPI)
+    	c64.CHROUT('\n')
+    	c64flt.print_f(c64flt.FL_FR4)
+    	c64.CHROUT('\n')
+    }
+
+    sub print_rom_floats_values() {
         ; these are all floating point constants defined in the ROM so no allocation required
+        ; the compiler recognises these and will substitute the ROM values automatically
 
         c64flt.print_f(3.141592653589793)
         c64.CHROUT('\n')
diff --git a/examples/test.p8 b/examples/test.p8
index eba707ad2..c50aefb97 100644
--- a/examples/test.p8
+++ b/examples/test.p8
@@ -4,19 +4,11 @@
 main {
     sub start() {
 
-            uword xx
-            ubyte yy
-                for xx in 319 downto 0 {
-                    ; TODO also fix that the asm is invalid for word iterator variable.
-                }
-
-
-            for yy in 199 downto 0 {
-                for xx in 319 downto 0 {
-                    ; TODO also fix that the asm is invalid for word iterator variable.
-                }
-            }
+;asmsub  clear_screen (ubyte char @ A, ubyte color @ Y) clobbers(A)  { ...}
+; TODO dont cause name conflict if we define sub or sub with param 'color' or even a var 'color' later.
 
+;   sub color(...) {}
+;   sub other(ubyte color) {}    ; TODO don't cause name conflict
 
 
         byte b1