diff --git a/images/apple/PLASMA-2.1-4TH.po b/images/apple/PLASMA-2.1-4TH.po
index 0d4c465..d2634a4 100644
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diff --git a/images/apple/PLASMA-2.1-BLD.po b/images/apple/PLASMA-2.1-BLD.po
index 9bf2934..ba001d5 100644
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diff --git a/images/apple/PLASMA-2.1-DEMOS.po b/images/apple/PLASMA-2.1-DEMOS.po
index 9781bf5..7a5cb65 100644
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diff --git a/images/apple/PLASMA-2.1-FPSOS.po b/images/apple/PLASMA-2.1-FPSOS.po
index 1e03a7c..809c1a4 100644
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diff --git a/images/apple/PLASMA-2.1-INET.po b/images/apple/PLASMA-2.1-INET.po
index fb1ed5d..bb176a0 100644
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diff --git a/images/apple/PLASMA-2.1-SYS.po b/images/apple/PLASMA-2.1-SYS.po
index 1808e0d..be100ac 100644
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diff --git a/images/apple/PLASMA-2.1.po b/images/apple/PLASMA-2.1.po
index 846d501..091b222 100644
Binary files a/images/apple/PLASMA-2.1.po and b/images/apple/PLASMA-2.1.po differ
diff --git a/images/apple/PLASMA2.2mg b/images/apple/PLASMA2.2mg
index c78627d..39ad9f7 100644
Binary files a/images/apple/PLASMA2.2mg and b/images/apple/PLASMA2.2mg differ
diff --git a/images/apple/PLFORTH.PO b/images/apple/PLFORTH.PO
index 291de4d..e976676 100644
Binary files a/images/apple/PLFORTH.PO and b/images/apple/PLFORTH.PO differ
diff --git a/src/libsrc/apple/conio.pla b/src/libsrc/apple/conio.pla
index ef2f2bd..e27a65f 100644
--- a/src/libsrc/apple/conio.pla
+++ b/src/libsrc/apple/conio.pla
@@ -228,7 +228,7 @@ def a2viewport(left, top, width, height)
     ^$20 = left
     ^$21 = width
     ^$22 = top
-    ^$23 = height + top - 1
+    ^$23 = height + top
     return a2gotoxy(0, 0)
 end
 def a2texttype(type)
diff --git a/src/scripts/conio.4th b/src/scripts/conio.4th
index 8ff7f57..faf6e8d 100644
--- a/src/scripts/conio.4th
+++ b/src/scripts/conio.4th
@@ -1,4 +1,4 @@
-' CONIOAPI ENDSRC
+' CONIOAPI ?ENDSRC
 LOOKUP CONIO CONSTANT CONIOAPI
 CONIOAPI  3 IFACE PLASMA _HOME     : HOME _HOME DROP ;
 CONIOAPI  4 IFACE PLASMA _GOTOXY   : GOTOXY _GOTOXY DROP ;
diff --git a/src/scripts/fileio.4th b/src/scripts/fileio.4th
index bad561b..9f51004 100644
--- a/src/scripts/fileio.4th
+++ b/src/scripts/fileio.4th
@@ -1,4 +1,4 @@
-' FILEIOAPI ENDSRC
+' FILEIOAPI ?ENDSRC
 LOOKUP PERR   CONSTANT PERR
 LOOKUP FILEIO CONSTANT FILEIOAPI
 FILEIOAPI  2  IFACE PLASMA GETFILEINFO
diff --git a/src/scripts/fpu.4th b/src/scripts/fpu.4th
index 475ebad..c11bef8 100644
--- a/src/scripts/fpu.4th
+++ b/src/scripts/fpu.4th
@@ -1,4 +1,4 @@
-' FPULIB ENDSRC
+' FPULIB ?ENDSRC
 " SANE"   LOADMOD"  "
 " FPSTR"  LOADMOD"  "
 " FPU"    LOADMOD"  "
diff --git a/src/scripts/grlib.4th b/src/scripts/grlib.4th
index 4a19588..0586b59 100644
--- a/src/scripts/grlib.4th
+++ b/src/scripts/grlib.4th
@@ -1,4 +1,4 @@
-' GRMODE ENDSRC ( Avoid multiple loads )
+' GRMODE ?ENDSRC ( Avoid multiple loads )
 " GRLIB" LOADMOD"  "
 LOOKUP GRPLOT    PLASMA GRPLOT
 LOOKUP GRHLIN    PLASMA GRHLIN
diff --git a/src/scripts/hgrlib.4th b/src/scripts/hgrlib.4th
index b26c2fa..5321d08 100644
--- a/src/scripts/hgrlib.4th
+++ b/src/scripts/hgrlib.4th
@@ -1,4 +1,4 @@
-' HGRMODE ENDSRC
+' HGRMODE ?ENDSRC
 " HGRLIB" LOADMOD"  "
 LOOKUP HGRPLOT    PLASMA HGRPLOT
 LOOKUP HGRORPLOT  PLASMA HGRORPLOT
diff --git a/src/scripts/int32.4th b/src/scripts/int32.4th
index 88894b4..256d540 100644
--- a/src/scripts/int32.4th
+++ b/src/scripts/int32.4th
@@ -1,4 +1,4 @@
-' DVAR ENDSRC
+' DVAR ?ENDSRC
 " INT32"   LOADMOD"  "
 LOOKUP ZERO32     PLASMA ZERO32 
 LOOKUP ZEXT16TO32 PLASMA ZEXT32
diff --git a/src/scripts/machid.4th b/src/scripts/machid.4th
index 125611b..640f7a0 100644
--- a/src/scripts/machid.4th
+++ b/src/scripts/machid.4th
@@ -1,4 +1,4 @@
-' MACHID ENDSRC
+' MACHID ?ENDSRC
 $01 CONSTANT MACHID.CLOCK
 $02 CONSTANT MACHID.80COL
 $30 CONSTANT MACHID.MEM
diff --git a/src/scripts/plasma.4th b/src/scripts/plasma.4th
index 1e3527d..c8920a0 100644
--- a/src/scripts/plasma.4th
+++ b/src/scripts/plasma.4th
@@ -1,4 +1,4 @@
-' IFACE ENDSRC
+' IFACE ?ENDSRC
 : IFACE 2 * + @ ;
 LOOKUP CMDSYS 0  IFACE  CONSTANT PLASMAVER
 LOOKUP CMDSYS 2  IFACE  CONSTANT CMDLINE
@@ -7,14 +7,9 @@ LOOKUP STRCPY    PLASMA STRCPY
 LOOKUP STRCAT    PLASMA STRCAT
 LOOKUP TOUPPER   PLASMA TOUPPER
 LOOKUP HEAPAVAIL PLASMA FREEMEM
-: LOADMOD
-  CMDLINE " . " STRCPY DROP
-  CMDLINE SWAP STRCAT DROP
-  EXECMOD 0< ABORT" Failed to load module" ;
-: LOADMOD" 
-  PAD SWAP STRCPY
-  CHAR " WORD
-  LOADMOD ;
+: LOADMOD CMDLINE " . " STRCPY SWAP STRCAT DROP
+  EXECMOD 0< ?ABORT" Failed to load module" ;
+: LOADMOD" PAD SWAP STRCPY CHAR " WORD LOADMOD ;
 : EDIT " ED" "  " LOADMOD ;
 : EDIT" " ED" LOADMOD" ;
 : CAT " CAT" "  " LOADMOD ;
@@ -23,7 +18,7 @@ LOOKUP HEAPAVAIL PLASMA FREEMEM
 : REN" " REN" LOADMOD" ;
 : COPY" " COPY" LOADMOD" ;
 : NEWDIR" " NEWDIR" LOADMOD" ;
-LOOKUP FILEIO 0  IFACE PLASMA GETPFX
-LOOKUP FILEIO 1  IFACE PLASMA SETPFX
+LOOKUP FILEIO 0 IFACE PLASMA GETPFX
+LOOKUP FILEIO 1 IFACE PLASMA SETPFX
 : PFX. HERE GETPFX DROP HERE (.") ;
 : PFX" 34 WORD SETPFX DROP ;
diff --git a/src/toolsrc/plforth.pla b/src/toolsrc/plforth.pla
index 68c9fbc..077138f 100644
--- a/src/toolsrc/plforth.pla
+++ b/src/toolsrc/plforth.pla
@@ -15,13 +15,13 @@ byte  srclevel   = 0
 //
 // Internal buffers
 //
-word                      strbuf
-res[SRCREFS * INBUF_SIZE] inbuf
+word strbuf, inbuf
 res[t_except]             exitforth
 //
 // Input references, pointers, and saved values
 //
-word  keyinbuf = @inbuf // Point somewhere benign for starters (updated in keyin)
+byte  nullstr = 0
+word  keyinbuf = @nullstr // Point somewhere benign for starters (updated in keyin)
 word  inbufptr
 byte  inref[SRCREFS]
 word  previnptr[SRCREFS]
@@ -97,7 +97,7 @@ const interponly_flag = $80
 //
 // Predefine instrinsics
 //
-predef _swap_(a,b)#2, _dashdup_(a)#1, _over_(a,b)#3, _rot_(a,b,c)#3
+predef _swap_(a,b)#2, _ifdup_(a)#1, _over_(a,b)#3, _rot_(a,b,c)#3
 predef _abs_(a)#1, _max_(a,b)#1, _min_(a,b)#1, _wplusset_(a,b)#0
 predef _ffa_(a)#1, _lfa_(a)#1, _hfa_(a)#1, _cfa_(a)#1, _pfa_(a)#1, _allot_(a)#0
 predef _branch_#0, _0branch_(a)#0, _if_#0, _else_#0, _then_#0
@@ -114,7 +114,7 @@ predef _tick_#0, _forget_#0, _terminal_#1, _key_#1, _prat_(a)#0
 predef _blank_#0, _char_#0, _str_#0, _prstr_#0, _prpstr_#0
 predef _prval_(a)#0, _prbyte_(a)#0, _prhex_(a)#0, _accept_(a,b)#1, _type_(a,b)#0
 predef _vlist_#0, _tron_#0, _troff_#0, _stepon_#0, _stepoff_#0
-predef _itc_#0, _pbc_#0, _comment_#0, _src_(a)#0, _srcstr_#0, _endsrc_(a)#0
+predef _itc_#0, _pbc_#0, _comment_#0, _src_(a)#0, _srcstr_#0, _endsrc_#0, _ifendsrc_(a)#0
 predef _brk_#0, _brkon_#0, _brkoff_#0, _word_(a)#1, _count_(a)#2
 predef _space_#0, _spaces_(a)#0, _show_#0, _showstack_#0, _showrstack_#0
 predef _cont_#0, _restart_#0, _bye_#0, _quit_#0
@@ -132,14 +132,14 @@ word = @d_drop, 0, @_swap_
 char d_dup = "DUP"
 byte = inline_flag
 word = @d_swap, 0, 0, $34
-// -DUP
-char d_dashdup = "-DUP"
+// ?DUP
+char d_ifdup = "?DUP"
 byte = 0
-word = @d_dup, 0, @_dashdup_
+word = @d_dup, 0, @_ifdup_
 // OVER
 word d_over = "OVER"
 byte = 0
-word = @d_dashdup, 0, @_over_
+word = @d_ifdup, 0, @_over_
 // ROT
 word d_rot = "ROT"
 byte = 0
@@ -612,10 +612,14 @@ word = @d_prpstr, 0, @_src_
 char d_srcstr = "SRC\""
 byte = imm_flag
 word = @d_src, 0, @_srcstr_
+// IF END SOURCE FILE
+char d_ifendsrc = "?ENDSRC"
+byte = showcr_flag
+word = @d_srcstr, 0, @_ifendsrc_
 // END SOURCE FILE
 char d_endsrc = "ENDSRC"
 byte = showcr_flag
-word = @d_srcstr, 0, @_endsrc_
+word = @d_ifendsrc, 0, @_endsrc_
 // CONTINUE AFTER BRK
 char d_cont = "CONT"
 byte = interponly_flag
@@ -625,15 +629,15 @@ char d_quit = "QUIT"
 byte = showcr_flag
 word = @d_cont, 0, @_quit_
 // ABORT IF <> 0
-char d_abort = "ABORT"
+char d_abort = "?ABORT"
 byte = showcr_flag
 word = @d_quit, 0, @_abort_
 // DOABORTSTR
-char d_doabortstr = "(ABORT\")"
+char d_doabortstr = "(?ABORT\")"
 byte = showcr_flag
 word = @d_abort, 0, @_doabortstr_
 // ABORTSTR
-char d_abortstr = "ABORT\""
+char d_abortstr = "?ABORT\""
 byte = imm_flag
 word = @d_doabortstr, 0, @_abortstr_
 // COLD exitforth
@@ -1082,7 +1086,7 @@ end
 def _swap_(a,b)#2
   return b,a
 end
-def _dashdup_(a)#1
+def _ifdup_(a)#1
   if a; (@push)(a)#0; fin
   return a
 end
@@ -1716,7 +1720,7 @@ def _src_(a)#0
   if inref[srclevel]
     fileio:newline(inref[srclevel], $7F, $0D)
     infunc               = @filein
-    inbufptr             = @inbuf + srclevel * INBUF_SIZE
+    inbufptr             = inbuf + srclevel * INBUF_SIZE
     previnptr[srclevel]  = inptr
     inptr                = inbufptr
     ^inptr               = 0
@@ -1739,7 +1743,10 @@ def _srcstr_#0
     _src_(filename)
   fin
 end
-def _endsrc_(a)#0
+def _endsrc_#0
+  endsrc
+end
+def _ifendsrc_(a)#0
   if a
     endsrc
   fin
@@ -1972,6 +1979,7 @@ _estkl = ^(@syscall + 1) // Hack to fill in parameter stack locations
 _estkh = ^(@syscall + 3)
 fileio:iobufalloc(4) // Allocate a bunch of file buffers
 strbuf = heapalloc(256)
+inbuf  = heapalloc(SRCREFS * INBUF_SIZE)
 startheap = heapmark
 coldstart
 //