diff --git a/codeGenVirtual/src/prog8/codegen/virtual/ExpressionGen.kt b/codeGenVirtual/src/prog8/codegen/virtual/ExpressionGen.kt
index c61c6d34b..94ebc1073 100644
--- a/codeGenVirtual/src/prog8/codegen/virtual/ExpressionGen.kt
+++ b/codeGenVirtual/src/prog8/codegen/virtual/ExpressionGen.kt
@@ -6,6 +6,7 @@ import prog8.code.ast.*
 import prog8.code.core.*
 import prog8.vm.Instruction
 import prog8.vm.Opcode
+import prog8.vm.Syscall
 import prog8.vm.VmDataType
 
 
@@ -360,6 +361,17 @@ internal class ExpressionGen(val codeGen: CodeGen) {
             "lsb" -> {
                 code += translateExpression(call.args.single(), resultRegister, regUsage)
             }
+            "memory" -> {
+                val name = (call.args[0] as PtString).value
+                val size = (call.args[1] as PtNumber).number.toUInt()
+                val align = (call.args[2] as PtNumber).number.toUInt()
+                TODO("Memory($name, $size, $align)")
+            }
+            "rnd" -> {
+                code += VmCodeInstruction(Instruction(Opcode.SYSCALL, value=Syscall.RND.ordinal))
+                if(resultRegister!=0)
+                    code += VmCodeInstruction(Instruction(Opcode.LOADR, VmDataType.BYTE, reg1=resultRegister, reg2=0))
+            }
             else -> {
                 // TODO builtin functions...
                 TODO("builtinfunc ${call.name}")
diff --git a/compiler/res/prog8lib/virtual/textio.p8 b/compiler/res/prog8lib/virtual/textio.p8
index 6ef2dd38c..ca9f14715 100644
--- a/compiler/res/prog8lib/virtual/textio.p8
+++ b/compiler/res/prog8lib/virtual/textio.p8
@@ -19,6 +19,14 @@ sub spc() {
     txt.chrout(' ')
 }
 
+sub lowercase() {
+    ; not supported
+}
+
+sub uppercase() {
+    ; not supported
+}
+
 sub chrout(ubyte char) {
     syscall1(2, char)
 }
diff --git a/docs/source/todo.rst b/docs/source/todo.rst
index 67f23043a..92e8fc8ce 100644
--- a/docs/source/todo.rst
+++ b/docs/source/todo.rst
@@ -3,6 +3,9 @@ TODO
 
 For next release
 ^^^^^^^^^^^^^^^^
+- adapt to new(?) addresses in cx16 math library https://github.com/commanderx16/x16-docs/blob/master/Commander%20X16%20Programmer's%20Reference%20Guide.md#math-library
+  also fix calls to FPWRT etc as suggested there
+
 ...
 
 
diff --git a/examples/fibonacci.p8 b/examples/fibonacci.p8
index ab7b3222c..7b8b602ed 100644
--- a/examples/fibonacci.p8
+++ b/examples/fibonacci.p8
@@ -10,7 +10,7 @@ main {
 
         repeat 21 {
             txt.print_uw(fib_next())
-            c64.CHROUT('\n')
+            txt.nl()
         }
     }
 
diff --git a/virtualmachine/src/prog8/vm/SysCalls.kt b/virtualmachine/src/prog8/vm/SysCalls.kt
index 0bf05379f..ab54849b1 100644
--- a/virtualmachine/src/prog8/vm/SysCalls.kt
+++ b/virtualmachine/src/prog8/vm/SysCalls.kt
@@ -1,6 +1,7 @@
 package prog8.vm
 
 import kotlin.math.min
+import kotlin.random.Random
 
 /*
 SYSCALLS:
@@ -16,6 +17,7 @@ SYSCALLS:
 8 = gfx_enable  ; enable graphics window  r0.b = 0 -> lores 320x240,  r0.b = 1 -> hires 640x480
 9 = gfx_clear   ; clear graphics window with shade in r0.b
 10 = gfx_plot   ; plot pixel in graphics window, r0.w/r1.w contain X and Y coordinates, r2.b contains brightness
+11 = rnd    ; random BYTE
 */
 
 enum class Syscall {
@@ -29,7 +31,8 @@ enum class Syscall {
     SLEEP,
     GFX_ENABLE,
     GFX_CLEAR,
-    GFX_PLOT
+    GFX_PLOT,
+    RND
 }
 
 object SysCalls {
@@ -76,6 +79,9 @@ object SysCalls {
             Syscall.GFX_ENABLE -> vm.gfx_enable()
             Syscall.GFX_CLEAR -> vm.gfx_clear()
             Syscall.GFX_PLOT -> vm.gfx_plot()
+            Syscall.RND -> {
+                vm.registers.setB(0, (Random.nextInt() ushr 3).toUByte())
+            }
         }
     }
 }