diff --git a/desk.acc/.gitignore b/desk.acc/.gitignore
index cb59be2..3c793f5 100644
--- a/desk.acc/.gitignore
+++ b/desk.acc/.gitignore
@@ -1,2 +1,12 @@
+
+# Object files (assembler output, pre-linking)
 *.o
+
+# Listing files (to review offsets)
 *.list
+
+# Output files (ProDOS file type F1)
+*.F1
+
+# Directory mounted in Virtual ][ as a ProDOS volume
+mount
diff --git a/desk.acc/Makefile b/desk.acc/Makefile
new file mode 100644
index 0000000..f223661
--- /dev/null
+++ b/desk.acc/Makefile
@@ -0,0 +1,22 @@
+
+CC65 = ~/dev/cc65/bin
+CAFLAGS = --target apple2enh --list-bytes 0
+CCFLAGS = --config apple2-asm.cfg
+
+# ProDOS file type is $F1 ($ is pesky)
+TARGETS = show_text_file.F1 show_dhr_file.F1
+
+.PHONY: clean all
+all: $(TARGETS)
+
+HEADERS = $(wildcard ../*.h)
+
+clean:
+	rm -f *.o
+	rm -f $(TARGETS)
+
+%.o: %.s $(HEADERS)
+	$(CC65)/ca65 $(CAFLAGS) --listing $(basename $@).list -o $@ $<
+
+%.F1: %.o
+	$(CC65)/ld65 $(CCFLAGS) -o $@ $<
diff --git a/desk.acc/README.md b/desk.acc/README.md
index 71a2fc7..602ff63 100644
--- a/desk.acc/README.md
+++ b/desk.acc/README.md
@@ -6,18 +6,20 @@ Disassembly of the desk accessories:
 * [Show Text File](show_text_file.s) - in progress!
 * Sort Directory - _not started_
 
+New desk accessories:
+* [Show DHR File](show_dhr_file.s) - in progress!
+
 ## Desk Accessory Details
 
 * Loaded at $800 through (at least) $14FF
 * Copy themselves from Main into Aux memory (same location)
 * Can call into ProDOS MLI and A2D entry points ($4000, etc)
 
-## Process
+## Files
 
-* `go.sh` - bash script used to drive the initial disassembly
-   (now commented out) and building
+* `Makefile` - cleans/builds targets
+* `go.sh` - bash script to build, verify, and copy files
 
 * `*.bin` - original binary (type $F1, start $800)
 * `*.info` - da65 "info" file - used to inform disassembly
 * `*.s` - source (originally generated using da65, now modified)
-* `*` - linked target - byte-for-byte identical with original
diff --git a/desk.acc/go.sh b/desk.acc/go.sh
index c28ae45..8ca0429 100755
--- a/desk.acc/go.sh
+++ b/desk.acc/go.sh
@@ -2,36 +2,16 @@
 
 set -e
 
-CC65=~/dev/cc65/bin
-
-original=show_text_file.bin
-disasm=show_text_file.d
-
-src=show_text_file.s
-obj=show_text_file.o
-list=show_text_file.list
-out=show_text_file
-
-# Origin of STF
-#echo '        .org $800' > $disasm
-
-# Disassemble original source
-#$CC65/da65 $original --info show_text_file.info >> $disasm
-
-#cp $disasm $src
-
-# Assemble
-$CC65/ca65 --target apple2enh --listing $list --list-bytes 0 -o $obj $src
-
-# Link
-$CC65/ld65 --config apple2-asm.cfg -o $out $obj
+make clean
+make all
 
 # Verify original and output match
-diff $original $out
+diff show_text_file.bin show_text_file.F1 \
+    && echo "Files match"
 
-$CC65/ca65 --target apple2enh --listing dhr.list --list-bytes 0 -o dhr.o dhr.s
-$CC65/ld65 --config apple2-asm.cfg -o dhr dhr.o
+cat show_dhr_file.F1 > mount/SHOW.DHR.FILE.\$F1 \
+    && echo "Updated mounted file"
 
 # Show output for review
 #less $list
-less dhr.list
+#less dhr.list
diff --git a/desk.acc/dhr.s b/desk.acc/show_dhr_file.s
similarity index 100%
rename from desk.acc/dhr.s
rename to desk.acc/show_dhr_file.s
diff --git a/desk.acc/stf b/desk.acc/stf
deleted file mode 100644
index 79c30bc..0000000
Binary files a/desk.acc/stf and /dev/null differ