c64: $a5 removed from free ZP (it's actually used by kernal disk routines)

codeCore/src/prog8/code/target/c64/C64Zeropage.kt

@@ -53,11 +53,11 @@ class C64Zeropage(options: CompilationOptions) : Zeropage(options) {
                 ).map{it.toUInt()})
             }
 
-            if(options.zeropage!= ZeropageType.DONTUSE) {
+            if(options.zeropage != ZeropageType.DONTUSE) {
                 // add the free Zp addresses
                 // these are valid for the C-64 but allow BASIC to keep running fully *as long as you don't use tape I/O*
                 free.addAll(listOf(0x02, 0x03, 0x04, 0x05, 0x06, 0x0a, 0x0e,
-                        0x92, 0x96, 0x9b, 0x9c, 0x9e, 0x9f, 0xa5, 0xa6,
+                        0x92, 0x96, 0x9b, 0x9c, 0x9e, 0x9f, 0xa6,
                         0xb0, 0xb1, 0xbe, 0xbf, 0xf9).map{it.toUInt()})
             } else {
                 // don't use the zeropage at all

docs/source/todo.rst

@@ -1,7 +1,6 @@
 TODO
 ====
 
-- fix c64 diskio.f_write optimizer issue (in test.p8)
 - why is petscii \n translated to $8d and not $0d?  and \r IS translated to $0d?
 - add a compiler switch to replace all calls to the math word mul routine on the X16 by the verafx call instead.
 - [on branch: shortcircuit] investigate McCarthy evaluation again? this may also reduce code size perhaps for things like if a>4 or a<2 ....

examples/test.p8

@@ -7,6 +7,12 @@
 
 main {
     sub start() {
+        txt.print("\\r=")
+        txt.print_ub('\r')
+        txt.print(" and \\n=")
+        txt.print_ub('\n')
+        txt.nl()
+
         ubyte[256] buf
 
         void diskio.delete("lines.txt")