diff --git a/build/Makefile b/build/Makefile
index 4879aad..056f2a0 100644
--- a/build/Makefile
+++ b/build/Makefile
@@ -25,7 +25,7 @@ BINARIES=../binaries/
 all: cmd others a.ptr a.rim image.fs
 
 # Make alternative everything: no dd but . and ..
-alt: altcmd altothers alt/a.rim alt/image.fs
+alt: altcmd altothers a.rim alt/a.ptr alt/image.fs
 
 # The run rule has no dependencies so that the system can be booted easily
 # and frequently with make run. However, you have to manually make all first!
@@ -34,7 +34,7 @@ run:
 
 # Alternative run, use the alt/image.fs
 altrun:
-	cd alt; $(PDP7) unixv0.simh
+	$(PDP7) alt/unixv0.simh
 
 dist: all alt
 	mkdir -p $(BINARIES)
diff --git a/build/alt/unixv0.simh b/build/alt/unixv0.simh
index 38593b0..4f209fc 100644
--- a/build/alt/unixv0.simh
+++ b/build/alt/unixv0.simh
@@ -3,11 +3,29 @@ set cpu eae
 set cpu history=100
 show cpu
 
+# set up SIMH devices:
+
+# UNIX character translations (CR to NL, ESC to ALTMODE):
 set tti unix
+
+# RB09 fixed head disk:
 set rb ena
-att rb image.fs
+att rb alt/image.fs
+
+# uncomment to TELNET in GRAPHICS-2 keyboard/display(!!)
+# (requires github.com/philbudne/simh)
+#set g2in ena
+#att -U g2in 12345
+
+# disable hardware UNIX-7 doesn't know about:
+set lpt disa
+set drm disa
+set dt disa
+
+# show device settings:
 show dev
 
+# load and run the bootstrap code
 load -S a.rim
-dep pc 0100
+dep pc 010000
 go