Refactor vf-cbm-bufs.fth and vf-cbm-core.fth so that

compiling without including the buffer mechanism is possible.

6502/C64/src/vf-cbm-bufs.fth

@@ -7,8 +7,6 @@ User file           0 file !
         \ adr of file control block
 Variable prev       0 prev !
         \ Listhead
-Variable buffers  0 buffers !
-        \ Semaphore
 0408 Constant b/buf
         \ Physical Size
 
@@ -120,22 +118,6 @@ Label blockfound     SP 2inc
 
 Defer diskerr  ' (diskerr  Is diskerr
 
-Defer r/w
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
 
 \ *** Block No. 107, Hexblock 6b
 6b fthpage
@@ -219,8 +201,11 @@ Defer r/w
 : block   ( blk -- addr )
  file@  (block ;
 
+: (blk-source   ( -- addr len)
+ blk @  ?dup IF  block b/blk exit THEN
+ tib #tib @  ;
 
-
+' (blk-source IS source
 
 
 
@@ -231,11 +216,18 @@ Defer r/w
 
 : update   080 prev @  6+ 1+ c! ;
 
-: save-buffers
+: (save-buffers
  buffers lock BEGIN   updates? ?dup
               WHILE backup REPEAT
  buffers unlock  ;
 
+' (save-buffers IS save-buffers
+
+| : (init-buffers
+ 0 prev !  limit first !  all-buffers ;
+
+' (init-buffers IS init-buffers
+
 : empty-buffers
  buffers lock  prev
  BEGIN @ ?dup
@@ -245,12 +237,13 @@ Defer r/w
 : flush    save-buffers empty-buffers ;
 
 
-
-
-
-
-
-
+: list   ( blk --)
+ scr ! ." Scr " scr @ dup blk/drv mod u.
+       ." Dr "  drv? .
+ l/s 0 DO stop? IF leave THEN
+   cr I 2 .r space scr @  block
+      I c/l * + c/l  (C 1- )
+   -trailing type  LOOP cr ;
 
 
 \ *** Block No. 111, Hexblock 6f
@@ -287,8 +280,6 @@ Defer r/w
 
 \ Allocating buffers          clv12jul87
 
-\ E400 Constant limit     Variable first
-
 : allotbuffer   ( -- )
  first @  r0 @ -  b/buf 2+ u< ?exit
  b/buf negate first +!

6502/C64/src/vf-cbm-core.fth

@@ -1378,10 +1378,13 @@ Code capitalize  ( string -- string )
 
 ( source word parse name      08apr85bp)
 
-: source   ( -- addr len)
- blk @  ?dup IF  block b/blk exit THEN
+defer source
+
+: (source   ( -- addr len)
  tib #tib @  ;
 
+' (source IS source
+
 : word  ( char -- addr)   source (word ;
 
 : parse ( char -- addr len)
@@ -2335,13 +2338,6 @@ Label (-trail
 10 (C drop 19 ) Constant l/s
    \ lines per screen
 
-: list   ( blk --)
- scr ! ." Scr " scr @ dup blk/drv mod u.
-       ." Dr "  drv? .
- l/s 0 DO stop? IF leave THEN
-   cr I 2 .r space scr @  block
-      I c/l * + c/l  (C 1- )
-   -trailing type  LOOP cr ;
 
 
 
@@ -2381,11 +2377,16 @@ end-code
 
 E400 Constant limit     Variable first
 
+Variable buffers  0 buffers !
+        \ Semaphore
+
+Defer r/w
+Defer save-buffers  ' noop IS save-buffers
+Defer init-buffers  ' noop IS init-buffers
+
 include vf-cbm-bufs.fth
 
 
-
-
 \ *** Block No. 113, Hexblock 71
 71 fthpage
 
@@ -2594,9 +2595,6 @@ Host Target
  BEGIN  dup  2- @  over 4 - !
         @ ?dup 0= UNTIL ;
 
-| : init-buffers
- 0 prev !  limit first !  all-buffers ;
-
 Defer 'cold    ' noop Is 'cold
 
 | : (cold