diff --git a/make.sh b/make.sh
old mode 100755
new mode 100644
index 2bfff4b..f542d65
--- a/make.sh
+++ b/make.sh
@@ -1,13 +1,12 @@
-# 1.0
+if [ ! -d tmp ]; then
+	mkdir tmp
+fi
+
 for i in cbmbasic1 cbmbasic2 kbdbasic osi kb9 applesoft microtan; do
 
 echo $i
 ca65 -D $i msbasic.s -o tmp/$i.o &&
-ld65 -C $i.cfg tmp/$i.o -o tmp/$i-new.bin -Ln tmp/$i.lbl && 
-xxd -g 1 orig/$i.bin > tmp/$i.bin.txt
-xxd -g 1 tmp/$i-new.bin > tmp/$i-new.bin.txt
-diff -u tmp/$i.bin.txt tmp/$i-new.bin.txt | head
+ld65 -C $i.cfg tmp/$i.o -o tmp/$i.bin -Ln tmp/$i.lbl
 
 done
 
-#da65 --info applesoft-temp.txt 
diff --git a/msbasic.s b/msbasic.s
index cd0a04b..a6d12f8 100644
--- a/msbasic.s
+++ b/msbasic.s
@@ -43,13 +43,13 @@
 ; CONFIG_NO_CR						terminal doesn't need explicit CRs on line ends
 ; CONFIG_NO_LINE_EDITING			disable support for Microsoft-style "@", "_", BEL etc.
 ; CONFIG_NO_POKE					don't support PEEK, POKE and WAIT
-; CONFIG_NO_READ_Y_IS_ZERO_HACK		don't do a ver volatile trick that saves one byte
+; CONFIG_NO_READ_Y_IS_ZERO_HACK		don't do a very volatile trick that saves one byte
 ; CONFIG_NULL						support for the NULL statement
 ; CONFIG_PEEK_SAVE_LINNUM			preserve LINNUM on a PEEK
 ; CONFIG_PRINTNULLS					whether PRINTNULLS does anything
 ; CONFIG_PRINT_CR					print CR when line end reached
 ; CONFIG_RAM						optimizations for RAM version of BASIC, only use on 1.x
-; CONFIG_ROR_WORKAROUND				use workaround for buggy 6502s from 1975/1976; doesn't work with CONFIG_SMALL!
+; CONFIG_ROR_WORKAROUND				use workaround for buggy 6502s from 1975/1976; not safe for CONFIG_SMALL!
 ; CONFIG_SAFE_NAMENOTFOUND			check both bytes of the caller's address in NAMENOTFOUND
 ; CONFIG_SCRTCH_ORDER				where in the init code to call SCRTCH
 ; CONFIG_SMALL						use 6 digit FP instead of 9 digit, use 2 character error messages, don't have GET
@@ -59,10 +59,11 @@
 ;
 ; Credits:
 ; * main work by Michael Steil
-; * function names and all uppercase taken from Bob Sander-Cederlof's excellent AppleSoft II disassembly:
+; * function names and all uppercase comments taken from Bob Sander-Cederlof's excellent AppleSoft II disassembly:
 ;   http://www.txbobsc.com/scsc/scdocumentor/
 ; * Applesoft lite by Tom Greene http://cowgod.org/replica1/applesoft/ helped a lot, too.
 ; * Thanks to Joe Zbicak for help with Intellision Keyboard BASIC
+; * This work is dedicated to the memory of my dear hacking pal Michael "acidity" Kollmann.
 
 .debuginfo +
 
diff --git a/regress.sh b/regress.sh
new file mode 100755
index 0000000..bbfcf00
--- /dev/null
+++ b/regress.sh
@@ -0,0 +1,17 @@
+if [ ! -d orig ]; then
+	echo Please first run make.sh on the original .s files, create
+	echo the directory \"orig\", and copy all .bin files from \"tmp\"
+	echo into \"orig\".
+	exit;
+fi
+
+for i in cbmbasic1 cbmbasic2 kbdbasic osi kb9 applesoft microtan; do
+
+echo $i
+ca65 -D $i msbasic.s -o tmp/$i.o &&
+ld65 -C $i.cfg tmp/$i.o -o tmp/$i-new.bin -Ln tmp/$i.lbl && 
+xxd -g 1 orig/$i.bin > tmp/$i.bin.txt
+xxd -g 1 tmp/$i-new.bin > tmp/$i-new.bin.txt
+diff -u tmp/$i.bin.txt tmp/$i-new.bin.txt | head
+
+done
diff --git a/string.s b/string.s
index f2219ad..499d4cd 100644
--- a/string.s
+++ b/string.s
@@ -190,7 +190,7 @@ FINDHIGHESTSTRING:
         ldy     #$00
         sty     FNCNAM+1
 .ifdef CONFIG_2
-        sty     FNCNAM
+        sty     FNCNAM	; GC bugfix!
 .endif
         lda     STREND
         ldx     STREND+1
@@ -223,7 +223,7 @@ L335A:
 L335F:
         sta     HIGHDS
         stx     HIGHDS+1
-        lda     #$03
+        lda     #$03	; OSI GC bugfix -> $04 ???
         sta     DSCLEN
 L3367:
         lda     HIGHDS
@@ -267,7 +267,7 @@ L3376:
         jsr     LE7F3 ; XXX patch, call into screen editor
 .else
   .ifdef CONFIG_11
-        ldy     #$00
+        ldy     #$00	; GC bugfix
   .endif
         asl     a
         adc     #$05
@@ -354,7 +354,7 @@ L33FA:
 ; ----------------------------------------------------------------------------
 MOVE_HIGHEST_STRING_TO_TOP:
 .ifdef CONFIG_2
-        lda     FNCNAM+1
+        lda     FNCNAM+1	; GC bugfix
         ora     FNCNAM
 .else
         ldx     FNCNAM+1