Streamline initialization process

Instead of letting each configuration taking care of RDLN$ and
"CollapseOS" prompt, move this to BOOT to simplify xcomp units.

Initialization source code is now only for driver initialization.

blk/090

@@ -1,15 +1,10 @@
-4. Call INTERPRET
+4. Call INTERPRET which interprets boot source code until
+   ASCII EOT (4) is met. This usually init drivers.
+5. Initialize rdln buffer, _sys entry (for EMPTY), prints
+   "CollapseOS" and then calls (main).
+6. (main) interprets from rdln input (usually from KEY) until
+   EOT is met, then calls BYE.
 
-In other words, BOOT interprets bytes directly following
-CURRENT as Forth source code. This code will typically
-initialize all subsystems and then call RDLN$. As soon as
-this is called, INTERPRET will begin reading from RDLN< which
-reads from KEY.
-
-In the "/emul" binaries, "HERE" is readjusted to "CURRENT @" so
-that we don't have to relocate compiled dicts. Note that in
-this context, the initialization code is fighting for space
-with HERE: New entries to the dict will overwrite that code!
-Also, because we're barebone, we can't have comments. This can
-lead to peculiar code in this area where we try to "waste"
-space in initialization code.
+In RAM-only environment, we will typically have a
+"CURRENT @ HERE !" line during init to have HERE begin at the
+end of the binary instead of RAMEND.

blk/405

@@ -1,5 +1,6 @@
 : WS? 33 < ;
 : EOT? 4 = ; ( 4 == ASCII EOT, CTRL+D )
+: EOT, 4 C, ;
 
 : TOWORD
     0 ( dummy ) BEGIN

blk/417

@@ -2,8 +2,8 @@
     H@ 0x3c ( BLK(* ) RAM+ !
     1024 ALLOT
     ( LOAD detects end of block with ASCII EOT. This is why
-      we write it there. EOT == 0x04 )
-    4 C,
+      we write it there. )
+    EOT,
     0 BLKDTY !
     -1 BLK> !
 ;

blk/421

@@ -11,6 +11,5 @@
 : BS 8 EMIT ; : LF 10 EMIT ; : CR 13 EMIT ;
 : CRLF CR LF ; : SPC 32 EMIT ;
 : NL 0x0a RAM+ @ ( NLPTR ) DUP IF EXECUTE ELSE DROP CRLF THEN ;
-: (ok) SPC LIT" ok" (print) NL ;
 : (uflw) LIT" stack underflow" ERR ;
 : (wnf) (print) SPC LIT" word not found" ERR ;

blk/432

@@ -2,7 +2,7 @@
     BEGIN
     WORD DUP C@ EOT? IF DROP EXIT THEN
     (find) NOT IF (parse) ELSE EXECUTE THEN
-    C<? NOT IF (ok) THEN
+    C<? NOT IF SPC LIT< ok (print) NL THEN
     AGAIN ;
 ( Read from BOOT C< PTR and inc it. )
 : (boot<)

blk/436

@@ -9,4 +9,6 @@
     ( 0c == C<* )
     ['] (boot<) 0x0c RAM+ !
     ( boot< always has a char waiting. 06 == C<?* )
-    1 0x06 RAM+ ! (main) ;
+    1 0x06 RAM+ ! INTERPRET
+    RDLN$ LIT< _sys [entry]
+    LIT< CollapseOS (print) NL (main) ;

blk/618

@@ -12,4 +12,4 @@ RAMSTART 0x70 + CONSTANT ACIA_MEM
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !
-," : _ ACIA$ RDLN$ (ok) ; _ "
+," ACIA$ " EOT,

emul/xcomp.fs

@@ -28,13 +28,9 @@
 ( Update LATEST )
 PC ORG @ 8 + !
 ," CURRENT @ HERE ! "
-," : INIT "
 ," BLK$ "
-," ['] EFS@ BLK@* ! "
-," ['] EFS! BLK!* ! "
-," RDLN$ "
-," LIT< _sys [entry] "
-," LIT< CollapseOS (print) NL "
-," ; INIT "
+," ' EFS@ BLK@* ! "
+," ' EFS! BLK!* ! "
+EOT,
 ORG @ 256 /MOD 2 PC! 2 PC!
 H@ 256 /MOD 2 PC! 2 PC!

recipes/ti84/xcomp.fs

@@ -68,6 +68,6 @@ CREATE ~FNT CPFNT3x5
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !
-," : _ LCD$ KBD$ (ok) RDLN$ ; _ "
+," LCD$ KBD$ " EOT,
 ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
 H@ 256 /MOD 2 PC! 2 PC!

recipes/trs80/xcomp.fs

@@ -15,6 +15,6 @@ RS_ADDR 0x80 - CONSTANT RAMSTART
 PC ORG @ 8 + !
 ," CURRENT @ HERE ! "
 ( 0x0a == NLPTR. TRS-80 wants CR-only newlines )
-," : _ ['] CR 0x0a RAM+ ! BLK$ FD$ (ok) RDLN$ ; _ "
+," ' CR 0x0a RAM+ ! BLK$ FD$ " EOT,
 ORG @ 256 /MOD 2 PC! 2 PC!
 H@ 256 /MOD 2 PC! 2 PC!