diff --git a/asm/cmd/a2as/.gitignore b/asm/cmd/a2as/.gitignore
new file mode 100644
index 0000000..c13e21c
--- /dev/null
+++ b/asm/cmd/a2as/.gitignore
@@ -0,0 +1 @@
+a2as
diff --git a/asm/cmd/a2as/runtest.sh b/asm/cmd/a2as/runtest.sh
index b6d2afb..6ad067d 100755
--- a/asm/cmd/a2as/runtest.sh
+++ b/asm/cmd/a2as/runtest.sh
@@ -1,54 +1,67 @@
-go run a2as.go --in ../../../../goapple2/source/redbook/monitor.asm --out monitor.rom --flavor redbooka --listing monitor.lst --prefix=-1
+go build a2as.go
+
+echo monitor.rom
+./a2as --in ../../../../goapple2/source/redbook/monitor.asm --out monitor.rom --flavor redbooka --listing monitor.lst --prefix=-1
 MD5_MONITOR=$(md5 -q monitor.rom)
 [[ $MD5_MONITOR == 'bc0163ca04c463e06f99fb029ad21b1f' ]] || (echo 'Wrong checksum for monitor.rom'; false) || exit 1
 rm -f monitor.rom monitor.lst
 
-go run a2as.go --in ../../../../goapple2/source/redbook/miniasm.asm --out miniasm.rom --flavor redbooka --listing miniasm.lst --prefix=-1
+echo miniasm.rom
+./a2as --in ../../../../goapple2/source/redbook/miniasm.asm --out miniasm.rom --flavor redbooka --listing miniasm.lst --prefix=-1
 MD5_MINIASM=$(md5 -q miniasm.rom)
 [[ $MD5_MINIASM == 'e64882d56c485ee88d2bfaf4b642c2f9' ]] || (echo 'Wrong checksum for miniasm.rom'; false) || exit 1
 rm -f miniasm.rom miniasm.lst
 
-go run a2as.go --in ../../../../goapple2/source/redbook/sweet16.asm --out sweet16.rom --flavor redbooka --listing sweet16.lst --prefix=-1
+echo sweet16.rom
+./a2as --in ../../../../goapple2/source/redbook/sweet16.asm --out sweet16.rom --flavor redbooka --listing sweet16.lst --prefix=-1
 MD5_SWEET16=$(md5 -q sweet16.rom)
 [[ $MD5_SWEET16 == '93e148f5e30cdd574fd1bb3c26798787' ]] || (echo 'Wrong checksum for sweet16.rom'; false) || exit 1
 rm -f sweet16.rom sweet16.lst
 
-go run a2as.go --in ../../../../goapple2/source/redbook/fp.asm --out fp.rom --flavor redbookb --listing fp.lst --prefix=-1
+echo fp.rom
+./a2as --in ../../../../goapple2/source/redbook/fp.asm --out fp.rom --flavor redbookb --listing fp.lst --prefix=-1
 MD5_FP=$(md5 -q fp.rom)
 [[ $MD5_FP == '76ae6287e5e96471dc95e95eb93ba06d' ]] || (echo 'Wrong checksum for fp.rom'; false) || exit 1
 rm -f fp.rom fp.lst
 
-go run a2as.go --in ../../../../goapple2/source/redbook/misc-f669.asm --out misc-f669.rom --flavor redbooka --listing misc-f669.lst --prefix=0
+echo misc-f669.rom
+./a2as --in ../../../../goapple2/source/redbook/misc-f669.asm --out misc-f669.rom --flavor redbooka --listing misc-f669.lst --prefix=0
 MD5_MISC_F669=$(md5 -q misc-f669.rom)
 [[ $MD5_MISC_F669 == 'eccaef17e6340b54c309b87ffb6f6f22' ]] || (echo 'Wrong checksum for misc-f669.rom'; false) || exit 1
 rm -f misc-f669.rom misc-f669.lst
 
-go run a2as.go --in ../../../../goapple2/source/redbook/intbasic.asm --out intbasic.rom --flavor merlin --listing intbasic.lst --prefix=-1
+echo intbasic.rom
+./a2as --in ../../../../goapple2/source/redbook/intbasic.asm --out intbasic.rom --flavor merlin --listing intbasic.lst --prefix=-1
 MD5_INTBASIC=$(md5 -q intbasic.rom)
 [[ $MD5_INTBASIC == 'c22d8f7ebb54608c8718b66454ca691f' ]] || (echo 'Wrong checksum for intbasic.rom'; false) || exit 1
 rm -f intbasic.rom intbasic.lst
 
-go run a2as.go --in ../../../../goapple2/source/applesoft/S.acf --out applesoft.rom --flavor scma --listing applesoft.lst --prefix=-1
+echo applesoft.rom
+./a2as --in ../../../../goapple2/source/applesoft/S.acf --out applesoft.rom --flavor scma --listing applesoft.lst --prefix=-1
 MD5_APPLESOFT=$(md5 -q applesoft.rom)
 [[ $MD5_APPLESOFT == '84bfbe89c9cd96e589c4d4cb01df4c4a' ]] || (echo 'Wrong checksum for applesoft.rom'; false) || exit 1
 rm -f applesoft.rom applesoft.lst
 
-go run a2as.go --in ../../../../goapple2/source/progaid/hires.asm --out hires.rom --flavor redbooka
+echo hires.rom
+./a2as --in ../../../../goapple2/source/progaid/hires.asm --out hires.rom --flavor redbooka
 MD5_HIRES=$(md5 -q hires.rom)
 [[ $MD5_HIRES == 'efe22f1a8c94458068fb12ae702b58c4' ]] || (echo 'Wrong checksum for hires.rom'; false) || exit 1
 rm -f hires.rom
 
-go run a2as.go --in ../../../../goapple2/source/progaid/verify.asm --out verify.rom --flavor redbooka
+echo verify.rom
+./a2as --in ../../../../goapple2/source/progaid/verify.asm --out verify.rom --flavor redbooka
 MD5_VERIFY=$(md5 -q verify.rom)
 [[ $MD5_VERIFY == '527f420462426e4851b942af46cc7f48' ]] || (echo 'Wrong checksum for verify.rom'; false) || exit 1
 rm -f verify.rom
 
-go run a2as.go --in ../../../../goapple2/source/progaid/ramtest.asm --out ramtest.rom --flavor redbooka
+echo ramtest.rom
+./a2as --in ../../../../goapple2/source/progaid/ramtest.asm --out ramtest.rom --flavor redbooka
 MD5_RAMTEST=$(md5 -q ramtest.rom)
 [[ $MD5_RAMTEST == '0420635256a3b016323989e3a9fe4ce7' ]] || (echo 'Wrong checksum for ramtest.rom'; false) || exit 1
 rm -f ramtest.rom
 
-go run a2as.go --in ../../../../goapple2/source/progaid/music.asm --out music.rom --flavor redbooka
+echo music.rom
+./a2as --in ../../../../goapple2/source/progaid/music.asm --out music.rom --flavor redbooka
 MD5_MUSIC=$(md5 -q music.rom)
 [[ $MD5_MUSIC == '0ffe796a73410e822fcae5e510374924' ]] || (echo 'Wrong checksum for music.rom'; false) || exit 1
 rm -f music.rom
diff --git a/cpu/cpu.go b/cpu/cpu.go
index 5d05632..aa27899 100644
--- a/cpu/cpu.go
+++ b/cpu/cpu.go
@@ -131,7 +131,7 @@ func (c *cpu) Reset() {
 
 // status prints out the current CPU instruction and register status.
 func status(c *cpu, m Memory) string {
-	bytes, text, _ := asm.Disasm(c.PC(), m.Read(c.PC()), m.Read(c.PC()+1), m.Read(c.PC()+2))
+	bytes, text, _ := asm.Disasm(c.PC(), m.Read(c.PC()), m.Read(c.PC()+1), m.Read(c.PC()+2), nil, 3)
 	return fmt.Sprintf("$%04X: %-8s  %-11s  A=$%02X X=$%02X Y=$%02X SP=$%02X P=$%08b",
 		c.PC(), bytes, text, c.A(), c.X(), c.Y(), c.SP(), c.P())
 }