diff --git a/desktop/Makefile b/desktop/Makefile
index fcd71fd..4a937e4 100644
--- a/desktop/Makefile
+++ b/desktop/Makefile
@@ -1,7 +1,7 @@
 
 CC65 = ~/dev/cc65/bin
 CAFLAGS = --target apple2enh --list-bytes 0
-CCFLAGS = --config apple2-asm.cfg
+CCFLAGS = --config asm.cfg
 
 TARGETS = s0_loader.built s123_aux.built s4_main1.built
 
@@ -17,7 +17,7 @@ clean:
 %.o: %.s $(HEADERS)
 	$(CC65)/ca65 $(CAFLAGS) --listing $(basename $@).list -o $@ $<
 
-%.built: %.o
+%.built: %.o asm.cfg
 	$(CC65)/ld65 $(CCFLAGS) -o $@ $<
 
 check:
diff --git a/desktop/asm.cfg b/desktop/asm.cfg
new file mode 100644
index 0000000..8e5abef
--- /dev/null
+++ b/desktop/asm.cfg
@@ -0,0 +1,19 @@
+# Configuration for assembler programs which don't need a special setup
+
+FEATURES {
+    STARTADDRESS: default = $0803;
+}
+MEMORY {
+    ZP:     file = "",               start = $0000,         size = $00FF;
+    HEADER: file = %O,               start = %S - 4,        size = $0004;
+    MAIN:   file = %O, define = yes, start = %S,            size = $C000 - %S;
+    BSS:    file = "",               start = __MAIN_LAST__, size = $C000 - __MAIN_LAST__;
+}
+SEGMENTS {
+    ZEROPAGE: load = ZP,     type = zp,  optional = yes;
+    EXEHDR:   load = HEADER, type = ro,  optional = yes;
+    CODE:     load = MAIN,   type = rw;
+    RODATA:   load = MAIN,   type = ro,  optional = yes;
+    DATA:     load = MAIN,   type = rw,  optional = yes;
+    BSS:      load = BSS,    type = bss, optional = yes, define = yes;
+}