Reserve some RAM for future features

Why didn't I think of adding it before?

emul/hw/rc2014/README.md

@@ -9,3 +9,7 @@ Run `make` to build.
 
 Run `./classic /path/to/rom` (for example, `os.bin` from RC2014's recipe).
 Serial I/O is hooked to stdin/stdout. `CTRL+D` to quit.
+
+## Memory dump
+
+You can press `CTRL+E` to dump the whole 64K of memory into `memdump`.

emul/hw/rc2014/classic.c

@@ -101,6 +101,13 @@ int main(int argc, char *argv[])
         if (!tosend) {
             char c;
             if (read(fileno(stdin), &c, 1) == 1) {
+                if (c == 5) {
+                    fprintf(stderr, "Dumping memory to memdump\n");
+                    FILE *fp = fopen("memdump", "w");
+                    fwrite(m->mem, 0x10000, 1, fp);
+                    fclose(fp);
+                    c = 0; // don't send to RC2014
+                }
                 if (c == 4) {   // CTRL+D
                     // Stop here
                     break;

forth/boot.fs

@@ -218,7 +218,7 @@ PC ORG @ 0x29 + ! ( flagsToBC )
     BC 0 LDddnn,
     CZ RETcc, ( equal )
     BC INCss,
-    CM RETcc, ( > )
+    CC RETcc, ( > )
     ( < )
     BC DECss,
     BC DECss,

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/link.fs

@@ -1,11 +1,13 @@
-( depends: cmp
+( depends: cmp, parse
   Relink a dictionary by applying offsets to all word
   references in words of the "compiled" type.
 
   A typical usage of this unit would be to, right after a
-  bootstrap-from-icore-from-source operation, to copy the
+  bootstrap-from-icore-from-source operation, identify the
-  dictionary from '< H@ to CURRENT, and then call RLDICT on
+  root word of the source part, probably "H@", and run
-  that new range, with "ol" set to ' H@.
+  " ' thatword COMPACT ". Then, take the resulting relinked
+  binary, concatenate it to the boot binary, and write to
+  boot media.
 )
 
 ( Skip atom, considering special atom types. )
@@ -21,7 +23,8 @@
     ( a )
     1 + ( we skip by 2, but the loop below is pre-inc... )
     BEGIN 1 + DUP C@ NOT UNTIL
-    ( a+1 )
+    ( skip null char )
+    1 +
 ;
 
 ( Get word header length from wordref. That is, name length
@@ -78,6 +81,7 @@
         2OVER                   ( ol o a2 a1 ol o )
         SWAP                    ( ol o a2 a1 o ol )
         RLATOM                  ( ol o a2 a+n )
+        2DUP < IF ABORT THEN    ( Something is very wrong )
         2DUP =                  ( ol o a2 a+n f )
         IF
             ( unwind )

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
 

tests/forth/test_cmp.fs

@@ -2,3 +2,4 @@
 0x71 <>{ 0x70 &= 0x58 |= 0x20 |= <>} NOT #
 0x42 <>{ 0x40 &> 0x44 &< <>} #
 0x44 <>{ 0x40 &> 0x44 &< <>} NOT #
+0x22 0x8065 < #