Forth fixups, improvement and documentation updates

Source/Doc/ROM_Applications.md

@@ -234,7 +234,7 @@ For those are who are not familiar with Forth, I recommend the
 wikipedia article (en.wikipedia.org/wiki/Forth_(programming_language))
 and the Forth Interest Group website [www.forth.org](www.forth.org)
 
-Important things to know:
+## Important things to know
 
 Forth is case sensitive.
 
@@ -244,16 +244,12 @@ To get a list of available words type ***WORDS***
 
 To reset Forth to its initial state type ***COLD***
 
-Most code you will find on the internet will not run without modification.
-
+Most of the code you find on the internet will not run unless modified or additional Forth
+words are added to the dictionary.
 
 This implementation does not support loading or saving of programs. All programs
 need to be typed in. Additionally, screen editing and code blocks are not supported.
 
-Extensions and changes to this implementation compared to the original distribution are:
-
-Source code has been converted from Z80mr assembler to Hector Peraza's zsm.
-
 ## Structure of Forth source files
 
 File          | Description
@@ -261,13 +257,22 @@ File          | Description
 camel80.azm   | Code Primitives
  camel80d.azm | CPU Dependencies
  camel80h.azm | High Level words
- camel80r.asm | ROMWBW additions
+ camel80r.azm | ROMWBW additions
 glosshi.txt   | Glossary of high level words
 glosslo.txt   | Glossary of low level words
 
-## ROMWBW Additons
+## ROMWBW Additions
+
+Extensions and changes to this implementation compared to the original distribution are:
+
+The source code has been converted from Z80mr assembler to Hector Peraza's zsm.
+
+An additional file camel80r.azm has been added for including additional words to 
+the dictionary at build time. However, as currently configured there is very little space
+allocated for addition words. Exceeding the allocated ROM space will generate an error
+message when building.
 
-James Bowman's Double precision words have been added from his RC2014 version:
+James Bowman's double precision words have been added from his RC2014 version:
 (https://github.com/jamesbowman/camelforth-z80)
 
 Word    | Syntax                     | Description

Source/Forth/camel80.azm

@@ -1071,15 +1071,21 @@ snext:  next
 
 INCLUDE camel80d.azm   ; CPU Dependencies
 INCLUDE camel80h.azm   ; High Level words
-;INCLUDE camel80r.azm   ; ROMWBW additions
+INCLUDE camel80r.azm   ; ROMWBW additions
 ;INCLUDE cameltst.azm   ; Test Functions
 lastword EQU link   ; nfa of last word in dict.
 enddict EQU $       ; user's code starts here
 
 		; force padding to page boundary
 
-		ds (FTH_SIZ-(enddict-reset)-1)
-		nop
+IF ((enddict-reset) GT FTH_SIZ)
+ IF2
+	FORTH SIZE ERROR
+ ENDIF
+ELSE
+	ds (FTH_SIZ-(enddict-reset)-1)
+	nop
+ENDIF
 	.DEPHASE
 		
         END

Source/Forth/cameltst.azm

@@ -18,7 +18,7 @@
 ; ===============================================
 
 ;Z ><   u1 -- u2    swap the bytes of TOS
-    head SWAB,2,><,docode
+    head SWAB,2,!>!<,docode
         ld a,b
         ld b,c
         ld c,a
@@ -45,7 +45,7 @@
         next
 
 ;Z >HEX  c1 -- c2    convert nybble to hex char
-    head TOHEX,4,>HEX,docode
+    head TOHEX,4,!>HEX,docode
         ld a,c
         sub 0ah
         jr c,numeric