diff --git a/src/prelaunch/alcazar.a b/src/prelaunch/alcazar.a
index fc907e323..68db5aced 100644
--- a/src/prelaunch/alcazar.a
+++ b/src/prelaunch/alcazar.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $7c1e
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/alien.ambush.a b/src/prelaunch/alien.ambush.a
index 9cecf76c4..a90c7231e 100644
--- a/src/prelaunch/alien.ambush.a
+++ b/src/prelaunch/alien.ambush.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/alien.downpour.a b/src/prelaunch/alien.downpour.a
index 43e5c531d..482da4a10 100644
--- a/src/prelaunch/alien.downpour.a
+++ b/src/prelaunch/alien.downpour.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $73a0
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/alien.munchies.a b/src/prelaunch/alien.munchies.a
index bec9a68af..bca9d86b9 100644
--- a/src/prelaunch/alien.munchies.a
+++ b/src/prelaunch/alien.munchies.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $833
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/alien.rain.a b/src/prelaunch/alien.rain.a
index 54167a445..36291928a 100644
--- a/src/prelaunch/alien.rain.a
+++ b/src/prelaunch/alien.rain.a
@@ -24,3 +24,7 @@
 +
          +DISABLE_ACCEL
          jmp   $1000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/alien.typhoon.a b/src/prelaunch/alien.typhoon.a
index 49849c997..c26aa8b89 100644
--- a/src/prelaunch/alien.typhoon.a
+++ b/src/prelaunch/alien.typhoon.a
@@ -24,3 +24,7 @@
 +
          +DISABLE_ACCEL
          jmp   $2001
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/apple.panic.a b/src/prelaunch/apple.panic.a
index 6a97a4515..a3767e62a 100644
--- a/src/prelaunch/apple.panic.a
+++ b/src/prelaunch/apple.panic.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/arkanoid.a b/src/prelaunch/arkanoid.a
index 5dbde8b5d..ee9cec0a7 100644
--- a/src/prelaunch/arkanoid.a
+++ b/src/prelaunch/arkanoid.a
@@ -23,3 +23,7 @@
          lda   $c08b
          jsr   $ee1f
          jmp   $981
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/asteroid.blastr.a b/src/prelaunch/asteroid.blastr.a
index fb4e82580..4802b6120 100644
--- a/src/prelaunch/asteroid.blastr.a
+++ b/src/prelaunch/asteroid.blastr.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $800
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/axis.assassin.a b/src/prelaunch/axis.assassin.a
index 2f03c87d1..ec9eead58 100644
--- a/src/prelaunch/axis.assassin.a
+++ b/src/prelaunch/axis.assassin.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $5c00
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/bad.dudes.a b/src/prelaunch/bad.dudes.a
index c55ef3ce4..3e797d9cc 100644
--- a/src/prelaunch/bad.dudes.a
+++ b/src/prelaunch/bad.dudes.a
@@ -36,3 +36,7 @@ cheat
          jsr   DisableAccelerator
          lda   #$c2
          jmp   $d300
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/battlezone.a b/src/prelaunch/battlezone.a
index 155dbc24f..04a7210b8 100644
--- a/src/prelaunch/battlezone.a
+++ b/src/prelaunch/battlezone.a
@@ -21,3 +21,7 @@
 +
          +DISABLE_ACCEL
          jmp   $810
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/bcs.quest.a b/src/prelaunch/bcs.quest.a
index a20e7d6b6..e158659ed 100644
--- a/src/prelaunch/bcs.quest.a
+++ b/src/prelaunch/bcs.quest.a
@@ -25,3 +25,7 @@ cheat
 +
          +DISABLE_ACCEL
          rts
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/beer.run.a b/src/prelaunch/beer.run.a
index 5afb9a21c..fce5cc64d 100644
--- a/src/prelaunch/beer.run.a
+++ b/src/prelaunch/beer.run.a
@@ -23,3 +23,7 @@
 +
          +DISABLE_ACCEL
          jmp   $BB00
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/berzap.a b/src/prelaunch/berzap.a
index fb013a02e..fd04a2791 100644
--- a/src/prelaunch/berzap.a
+++ b/src/prelaunch/berzap.a
@@ -37,3 +37,7 @@ cheat2
          sta   $76ba      ; patch - don't increase lives
 +
          jmp   ($b2ce)
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/bolo.a b/src/prelaunch/bolo.a
index 6661826e0..b829d6e24 100644
--- a/src/prelaunch/bolo.a
+++ b/src/prelaunch/bolo.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $1100
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/bouncing.kmngas.a b/src/prelaunch/bouncing.kmngas.a
index beb31ff3c..16a86e228 100644
--- a/src/prelaunch/bouncing.kmngas.a
+++ b/src/prelaunch/bouncing.kmngas.a
@@ -28,3 +28,7 @@
 +
          +DISABLE_ACCEL
          jmp   $7200
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/brainteaserblvd.a b/src/prelaunch/brainteaserblvd.a
index c57925935..7c94f99f9 100644
--- a/src/prelaunch/brainteaserblvd.a
+++ b/src/prelaunch/brainteaserblvd.a
@@ -24,3 +24,7 @@
 +
          +DISABLE_ACCEL
          jmp   $0A00
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/bruce.lee.a b/src/prelaunch/bruce.lee.a
index f24242f08..01d655d50 100644
--- a/src/prelaunch/bruce.lee.a
+++ b/src/prelaunch/bruce.lee.a
@@ -56,3 +56,7 @@ lcpatch
          jmp   $3800
 }
 cheat_e
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/bubble.bobble.a b/src/prelaunch/bubble.bobble.a
index 6906acecf..7b732e711 100644
--- a/src/prelaunch/bubble.bobble.a
+++ b/src/prelaunch/bubble.bobble.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $6000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/buck.rogers.a b/src/prelaunch/buck.rogers.a
index 2d1bf65e6..044a5858d 100644
--- a/src/prelaunch/buck.rogers.a
+++ b/src/prelaunch/buck.rogers.a
@@ -21,3 +21,7 @@
 +
          +DISABLE_ACCEL
          jmp   $400
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/burgertime.a b/src/prelaunch/burgertime.a
index 9e3400b83..3bf153bac 100644
--- a/src/prelaunch/burgertime.a
+++ b/src/prelaunch/burgertime.a
@@ -29,3 +29,7 @@
 +
          +DISABLE_ACCEL
          jmp   $a300
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/buzzard.bait.a b/src/prelaunch/buzzard.bait.a
index fe1030591..5b8e79ba3 100644
--- a/src/prelaunch/buzzard.bait.a
+++ b/src/prelaunch/buzzard.bait.a
@@ -21,3 +21,7 @@
 +
          +DISABLE_ACCEL
          jmp   $8000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/cannonball.bltz.a b/src/prelaunch/cannonball.bltz.a
index a20b85b46..75836251b 100644
--- a/src/prelaunch/cannonball.bltz.a
+++ b/src/prelaunch/cannonball.bltz.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $a000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/canyon.climber.a b/src/prelaunch/canyon.climber.a
index ec0552aa8..ac320ff1f 100644
--- a/src/prelaunch/canyon.climber.a
+++ b/src/prelaunch/canyon.climber.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $3000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/ceiling.zero.a b/src/prelaunch/ceiling.zero.a
index 110b98b7b..1fdcfa45d 100644
--- a/src/prelaunch/ceiling.zero.a
+++ b/src/prelaunch/ceiling.zero.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $5FED
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/centipede.a b/src/prelaunch/centipede.a
index 835da6eaf..bb9f41d33 100644
--- a/src/prelaunch/centipede.a
+++ b/src/prelaunch/centipede.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $A000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/championship.lode.runner.a b/src/prelaunch/championship.lode.runner.a
index c6e9d739f..cd136492b 100644
--- a/src/prelaunch/championship.lode.runner.a
+++ b/src/prelaunch/championship.lode.runner.a
@@ -22,3 +22,7 @@
 +
          +DISABLE_ACCEL
          jmp   $6000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/cider.spider.a b/src/prelaunch/cider.spider.a
index 086b635c0..a4c98e2a8 100644
--- a/src/prelaunch/cider.spider.a
+++ b/src/prelaunch/cider.spider.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $1000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/commando.a b/src/prelaunch/commando.a
index 5443809f8..abcc977fe 100644
--- a/src/prelaunch/commando.a
+++ b/src/prelaunch/commando.a
@@ -34,3 +34,7 @@ cheat
          jsr   DisableAccelerator
          lda   #$c2
          jmp   $d300
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/conan.a b/src/prelaunch/conan.a
index 2ad96f181..c35ae5214 100644
--- a/src/prelaunch/conan.a
+++ b/src/prelaunch/conan.a
@@ -34,3 +34,7 @@
 +
          +DISABLE_ACCEL
          jmp   $6ba5
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/crime.wave.a b/src/prelaunch/crime.wave.a
index 39d9244ca..01e7bb1b6 100644
--- a/src/prelaunch/crime.wave.a
+++ b/src/prelaunch/crime.wave.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $0800
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/crisis.mountain.a b/src/prelaunch/crisis.mountain.a
index a9ee64da3..797d3ac9c 100644
--- a/src/prelaunch/crisis.mountain.a
+++ b/src/prelaunch/crisis.mountain.a
@@ -21,3 +21,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/crossfire.a b/src/prelaunch/crossfire.a
index 9479efb00..67c0dad15 100644
--- a/src/prelaunch/crossfire.a
+++ b/src/prelaunch/crossfire.a
@@ -23,3 +23,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/cubit.a b/src/prelaunch/cubit.a
index 5d8944abc..6b412a2ee 100644
--- a/src/prelaunch/cubit.a
+++ b/src/prelaunch/cubit.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/cyclod.a b/src/prelaunch/cyclod.a
index 4229f9c6c..12c89a60c 100644
--- a/src/prelaunch/cyclod.a
+++ b/src/prelaunch/cyclod.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $8EA6
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/death.sword.a b/src/prelaunch/death.sword.a
index 40d9e5a06..60db20f08 100644
--- a/src/prelaunch/death.sword.a
+++ b/src/prelaunch/death.sword.a
@@ -10,3 +10,7 @@
            lda   #$8b
            sta   $bf23      ; disable ROM mapping
            jmp   $2000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/defender.a b/src/prelaunch/defender.a
index 7c6a07e0a..438193414 100644
--- a/src/prelaunch/defender.a
+++ b/src/prelaunch/defender.a
@@ -21,3 +21,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/diamond.mine.a b/src/prelaunch/diamond.mine.a
index 5b99244f7..dc096b7b4 100644
--- a/src/prelaunch/diamond.mine.a
+++ b/src/prelaunch/diamond.mine.a
@@ -21,3 +21,7 @@
 +
          +DISABLE_ACCEL
          jmp   $5f00
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/dig.dug.a b/src/prelaunch/dig.dug.a
index 2a1bdc004..cad1e6366 100644
--- a/src/prelaunch/dig.dug.a
+++ b/src/prelaunch/dig.dug.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $8000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/donkey.kong.a b/src/prelaunch/donkey.kong.a
index b54799b26..245e7e891 100644
--- a/src/prelaunch/donkey.kong.a
+++ b/src/prelaunch/donkey.kong.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/drelbs.a b/src/prelaunch/drelbs.a
index 00819a804..b32f7a815 100644
--- a/src/prelaunch/drelbs.a
+++ b/src/prelaunch/drelbs.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $8000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/drol.a b/src/prelaunch/drol.a
index fecc44e9e..62e4919de 100644
--- a/src/prelaunch/drol.a
+++ b/src/prelaunch/drol.a
@@ -68,3 +68,7 @@ jmp1
          rts
 }
 cheat_e
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/eggs.it.a b/src/prelaunch/eggs.it.a
index 1b832dd2e..8f4723cfa 100644
--- a/src/prelaunch/eggs.it.a
+++ b/src/prelaunch/eggs.it.a
@@ -25,3 +25,7 @@
          sta   $962A      ; patch - don't decrease lives
 +
          jmp   ($0020)
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/falcons.a b/src/prelaunch/falcons.a
index cea5e6fc4..11aad63d8 100644
--- a/src/prelaunch/falcons.a
+++ b/src/prelaunch/falcons.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $6000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/firebird.a b/src/prelaunch/firebird.a
index fb196b179..2468c3cee 100644
--- a/src/prelaunch/firebird.a
+++ b/src/prelaunch/firebird.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $b000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/free.fall.a b/src/prelaunch/free.fall.a
index 57e6bed93..c8e527bd6 100644
--- a/src/prelaunch/free.fall.a
+++ b/src/prelaunch/free.fall.a
@@ -24,3 +24,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/gamma.goblins.a b/src/prelaunch/gamma.goblins.a
index d76d70aa9..92225655f 100644
--- a/src/prelaunch/gamma.goblins.a
+++ b/src/prelaunch/gamma.goblins.a
@@ -24,3 +24,7 @@
          lda   #$00
          tay
          jmp   $2035
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/genetic.drift.a b/src/prelaunch/genetic.drift.a
index e4c4b3516..3c1811091 100644
--- a/src/prelaunch/genetic.drift.a
+++ b/src/prelaunch/genetic.drift.a
@@ -23,3 +23,7 @@ patch
          sta   $5846      ; patch - don't decrease lives
 +
          jmp   $57D7
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/gold.rush.a b/src/prelaunch/gold.rush.a
index e8925188d..c3838d410 100644
--- a/src/prelaunch/gold.rush.a
+++ b/src/prelaunch/gold.rush.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $0B00
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/gorgon.a b/src/prelaunch/gorgon.a
index 1be926442..9cab67c95 100644
--- a/src/prelaunch/gorgon.a
+++ b/src/prelaunch/gorgon.a
@@ -23,3 +23,7 @@
 +
          +DISABLE_ACCEL
          jmp   $A720
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/gremlins.a b/src/prelaunch/gremlins.a
index 146489faf..87ae1433f 100644
--- a/src/prelaunch/gremlins.a
+++ b/src/prelaunch/gremlins.a
@@ -24,3 +24,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/hard.hat.mack.a b/src/prelaunch/hard.hat.mack.a
index 2678a652e..00236dce7 100644
--- a/src/prelaunch/hard.hat.mack.a
+++ b/src/prelaunch/hard.hat.mack.a
@@ -27,3 +27,7 @@ patcher  rts
          lda   #$FF
          pha
          rts
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/hero.a b/src/prelaunch/hero.a
index 830278532..0fbfa1c79 100644
--- a/src/prelaunch/hero.a
+++ b/src/prelaunch/hero.a
@@ -27,3 +27,7 @@
 +
          +DISABLE_ACCEL
          jmp   $6000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/hungryboy.a b/src/prelaunch/hungryboy.a
index c4741d983..c1b595c9a 100644
--- a/src/prelaunch/hungryboy.a
+++ b/src/prelaunch/hungryboy.a
@@ -25,3 +25,7 @@ patch    nop
 +
          +DISABLE_ACCEL
          jmp   $94E0
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/joust.a b/src/prelaunch/joust.a
index 666e2ae27..ec40e2276 100644
--- a/src/prelaunch/joust.a
+++ b/src/prelaunch/joust.a
@@ -25,3 +25,7 @@
 +
          +DISABLE_ACCEL
          jmp   $3e00
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/jumpman.a b/src/prelaunch/jumpman.a
index 85bb50e04..5464ac6f1 100644
--- a/src/prelaunch/jumpman.a
+++ b/src/prelaunch/jumpman.a
@@ -22,3 +22,7 @@
 +
          +DISABLE_ACCEL
          jmp   $8000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/kid.niki.a b/src/prelaunch/kid.niki.a
index 1d620ea87..cd064da34 100644
--- a/src/prelaunch/kid.niki.a
+++ b/src/prelaunch/kid.niki.a
@@ -18,3 +18,7 @@
          sta   $BD34      ; patch - don't decrease lives
 +
          jmp   $61E3
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/lady.tut.a b/src/prelaunch/lady.tut.a
index 514c15029..9fd19eab3 100644
--- a/src/prelaunch/lady.tut.a
+++ b/src/prelaunch/lady.tut.a
@@ -30,3 +30,7 @@ cheat=*+1
 +
          jmp   $8460
 end_patch
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/lancaster.a b/src/prelaunch/lancaster.a
index c662fabb8..015c9f5e2 100644
--- a/src/prelaunch/lancaster.a
+++ b/src/prelaunch/lancaster.a
@@ -25,3 +25,7 @@ cheat
          sta   $1476
 +
          jmp   $1000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/lazer.silk.a b/src/prelaunch/lazer.silk.a
index a0a741aac..3203fe806 100644
--- a/src/prelaunch/lazer.silk.a
+++ b/src/prelaunch/lazer.silk.a
@@ -21,3 +21,7 @@
 +
          +DISABLE_ACCEL
          jmp   ($0020)
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/lode.runner.a b/src/prelaunch/lode.runner.a
index 9b4f1f84a..18885e3e3 100644
--- a/src/prelaunch/lode.runner.a
+++ b/src/prelaunch/lode.runner.a
@@ -22,3 +22,7 @@
 +
          +DISABLE_ACCEL
          jmp   $9050
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/mario.bros.a b/src/prelaunch/mario.bros.a
index 68013b2f8..1bff5b2a6 100644
--- a/src/prelaunch/mario.bros.a
+++ b/src/prelaunch/mario.bros.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/montezuma.a b/src/prelaunch/montezuma.a
index 87850b6d8..756b38d53 100644
--- a/src/prelaunch/montezuma.a
+++ b/src/prelaunch/montezuma.a
@@ -19,3 +19,7 @@
 +
          +DISABLE_ACCEL
          jmp   $6004
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/moon.patrol.a b/src/prelaunch/moon.patrol.a
index 9dd4461e4..770371804 100644
--- a/src/prelaunch/moon.patrol.a
+++ b/src/prelaunch/moon.patrol.a
@@ -23,3 +23,7 @@
 +
          +DISABLE_ACCEL
          jmp   $919
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/mr.do.a b/src/prelaunch/mr.do.a
index 1f1fe4675..5827ba4eb 100644
--- a/src/prelaunch/mr.do.a
+++ b/src/prelaunch/mr.do.a
@@ -51,3 +51,7 @@ cheat48
     lda #>cheat1
     sta $1041
     jmp $1000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/mr.robot.a b/src/prelaunch/mr.robot.a
index f7f6a8847..390aa68e5 100644
--- a/src/prelaunch/mr.robot.a
+++ b/src/prelaunch/mr.robot.a
@@ -19,3 +19,7 @@
          sta   $78C5      ; patch - don't increase lives
 +
          jmp   $7600
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/ms.pacman.a b/src/prelaunch/ms.pacman.a
index f3eeeb051..4c90da4a0 100644
--- a/src/prelaunch/ms.pacman.a
+++ b/src/prelaunch/ms.pacman.a
@@ -28,3 +28,7 @@ cheat
          sta   $87e0
          sta   $97d2
          rts
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/night.mission.a b/src/prelaunch/night.mission.a
index e5e6918a8..769d7c04a 100644
--- a/src/prelaunch/night.mission.a
+++ b/src/prelaunch/night.mission.a
@@ -13,3 +13,7 @@
          jsr   $44E5      ; decompress
          +DISABLE_ACCEL
          jmp   $0800
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/paperboy.a b/src/prelaunch/paperboy.a
index 35da3eb99..ccf773b5d 100644
--- a/src/prelaunch/paperboy.a
+++ b/src/prelaunch/paperboy.a
@@ -10,3 +10,7 @@
            lda   #$8b
            sta   $bf23      ; disable ROM mapping
            jmp   $800
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/pest.patrol.a b/src/prelaunch/pest.patrol.a
index 45eb4c5bf..838223fef 100644
--- a/src/prelaunch/pest.patrol.a
+++ b/src/prelaunch/pest.patrol.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $4003
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/pitfall.ii.a b/src/prelaunch/pitfall.ii.a
index e54bcc5a8..7b8b1ebe6 100644
--- a/src/prelaunch/pitfall.ii.a
+++ b/src/prelaunch/pitfall.ii.a
@@ -13,3 +13,7 @@
          jsr   $0800      ; decompress
          +DISABLE_ACCEL
          jmp   $6000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/pooyan.a b/src/prelaunch/pooyan.a
index f1ea084aa..45b720452 100644
--- a/src/prelaunch/pooyan.a
+++ b/src/prelaunch/pooyan.a
@@ -22,3 +22,7 @@
 +
          +DISABLE_ACCEL
          jmp   $6000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/sammy.lightfoot.a b/src/prelaunch/sammy.lightfoot.a
index 5a2f1b172..f57f99b50 100644
--- a/src/prelaunch/sammy.lightfoot.a
+++ b/src/prelaunch/sammy.lightfoot.a
@@ -24,3 +24,7 @@
 +
          +DISABLE_ACCEL
          jmp   $B7A1
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/serpentine.a b/src/prelaunch/serpentine.a
index 16ef002f0..c594186ba 100644
--- a/src/prelaunch/serpentine.a
+++ b/src/prelaunch/serpentine.a
@@ -30,3 +30,7 @@ cheat=*+1
          sta   $868F      ; patch - don't decrease lives
 +
          jmp   $0800
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/skyfox.a b/src/prelaunch/skyfox.a
index 3f8c203a2..947f24acf 100644
--- a/src/prelaunch/skyfox.a
+++ b/src/prelaunch/skyfox.a
@@ -9,3 +9,7 @@
 
     inc $80 ; requires a non-zero value for the RNG
     jmp $4621
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/sneakers.a b/src/prelaunch/sneakers.a
index fed45c0bf..9c749ad76 100644
--- a/src/prelaunch/sneakers.a
+++ b/src/prelaunch/sneakers.a
@@ -20,3 +20,7 @@
 +
          +DISABLE_ACCEL
          jmp   $9e00
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/spys.demise.a b/src/prelaunch/spys.demise.a
index 8b7d8b17d..ac44d4e24 100644
--- a/src/prelaunch/spys.demise.a
+++ b/src/prelaunch/spys.demise.a
@@ -21,3 +21,7 @@
 +
          +DISABLE_ACCEL
          jmp   $6000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/standard.a b/src/prelaunch/standard.a
index 49a718c12..fb69eaca3 100644
--- a/src/prelaunch/standard.a
+++ b/src/prelaunch/standard.a
@@ -18,3 +18,7 @@
          ldx   #$FD                  ; Jump to game entry point via stack pop.
          txs
          rts
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/tapper.a b/src/prelaunch/tapper.a
index 8044362de..610fefe96 100644
--- a/src/prelaunch/tapper.a
+++ b/src/prelaunch/tapper.a
@@ -29,3 +29,7 @@ cheat
          sta   $1998
 +
          jmp   $d00
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/threshold.a b/src/prelaunch/threshold.a
index 9ad681865..f754d6a19 100644
--- a/src/prelaunch/threshold.a
+++ b/src/prelaunch/threshold.a
@@ -32,3 +32,7 @@ patch
          +DISABLE_ACCEL
          jmp   $6B00
 end_patch
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/tubeway.a b/src/prelaunch/tubeway.a
index 3317e7b28..6275ad1c8 100644
--- a/src/prelaunch/tubeway.a
+++ b/src/prelaunch/tubeway.a
@@ -21,3 +21,7 @@
 +
          +DISABLE_ACCEL
          jmp   $9000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/twerps.a b/src/prelaunch/twerps.a
index 1a5fe4ce7..47f0e03ec 100644
--- a/src/prelaunch/twerps.a
+++ b/src/prelaunch/twerps.a
@@ -31,3 +31,7 @@ patch
 +
          jmp   $0400
 end_patch
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/up.n.down.a b/src/prelaunch/up.n.down.a
index c0de8c4d6..17040c24c 100644
--- a/src/prelaunch/up.n.down.a
+++ b/src/prelaunch/up.n.down.a
@@ -28,3 +28,7 @@ patch
          sta   $0912      ; patch - don't decrease lives
 +
          jmp   $0200      ; continue with load
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/wavy.navy.a b/src/prelaunch/wavy.navy.a
index a58f54254..1eda3f52f 100644
--- a/src/prelaunch/wavy.navy.a
+++ b/src/prelaunch/wavy.navy.a
@@ -18,3 +18,7 @@
 +
          +DISABLE_ACCEL
          jmp   $800
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/xevious.a b/src/prelaunch/xevious.a
index c19a418c8..cf56272d7 100644
--- a/src/prelaunch/xevious.a
+++ b/src/prelaunch/xevious.a
@@ -34,3 +34,7 @@ patch2
          sta   $894F      ; patch - don't increase lives
 +
          jmp   $0600
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}
diff --git a/src/prelaunch/zaxxon.a b/src/prelaunch/zaxxon.a
index 4c682a9c4..75554264f 100644
--- a/src/prelaunch/zaxxon.a
+++ b/src/prelaunch/zaxxon.a
@@ -24,3 +24,7 @@ cheat
          sty   $1a61
 +
          jmp   $200
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}