Reserve some RAM for future features

forth/icore.fs

@@ -196,17 +196,17 @@
 ( system c< simply reads source from binary, starting at
   LATEST. Convenient way to bootstrap a new system. )
 : (c<)
-    ( 51 == SYSTEM SCRATCHPAD )
+    ( 60 == SYSTEM SCRATCHPAD )
-    0x51 _c RAM+ _c @   ( a )
+    0x60 _c RAM+ _c @   ( a )
     _c DUP _c C@        ( a c )
     _c SWAP 1 _c +      ( c a+1 )
-    0x51 _c RAM+ _c !   ( c )
+    0x60 _c RAM+ _c !   ( c )
 ;
 
 : BOOT
     LIT< (parse) _c (find) _c DROP _c (parse*) _c !
-    ( 51 == SYSTEM SCRATCHPAD )
+    ( 60 == SYSTEM SCRATCHPAD )
-    _c CURRENT _c @ 0x51 _c RAM+ _c !
+    _c CURRENT _c @ 0x60 _c RAM+ _c !
     ( 0c == CINPTR )
     LIT< (c<) _c (find) _c DROP 0x0c _c RAM+ _c !
     LIT< INIT _c (find)

forth/z80c.fs

@@ -247,8 +247,7 @@ CODE @
     E (HL) LDrr,
     HL INCss,
     D (HL) LDrr,
-    EXDEHL,
+    DE PUSHqq,
-    HL PUSHqq,
 ;CODE
 
 CODE C!

notes.txt

@@ -88,8 +88,9 @@ RAMSTART   INITIAL_SP
 +0e        WORDBUF
 +2e        SYSVNXT
 +4e        INTJUMP
-+51        SYSTEM SCRATCHPAD
++51        RESERVED
-+60        RAMEND
++60        SYSTEM SCRATCHPAD
++80        RAMEND
 
 INITIAL_SP holds the initial Stack Pointer value so that we know where to reset
 it on ABORT
@@ -119,8 +120,8 @@ SYSTEM SCRATCHPAD is reserved for temporary system storage or can be reserved
 by low-level drivers. These are the current usages of this space throughout the
 project:
 
-* 0x51-0x53: (c<) pointer during in-memory initialization (see below)
+* 0x60-0x62: (c<) pointer during in-memory initialization (see below)
-* 0x53-0x5b: ACIA buffer pointers in RC2014 recipes.
+* 0x62-0x6a: ACIA buffer pointers in RC2014 recipes.
 
 *** Initialization sequence
 

recipes/rc2014/conf.fs

@@ -2,5 +2,5 @@
 0xf000 CONSTANT RS_ADDR
 0x80   CONSTANT ACIA_CTL
 0x81   CONSTANT ACIA_IO
-RAMSTART 0x53 + CONSTANT ACIA_MEM
+RAMSTART 0x62 + CONSTANT ACIA_MEM