diff --git a/.travis.yml b/.travis.yml
index ad927e6c..a0890196 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,8 @@ language: c
 dist: trusty
 sudo: required
 env:
-  - EMULATOR=simh
-  - EMULATOR=klh10 MACSYMA=no
+  # EMULATOR=simh
+  # EMULATOR=klh10 MACSYMA=no
   - EMULATOR=sims MACSYMA=no
 install: sh -ex build/dependencies.sh install_${TRAVIS_OS_NAME:-linux}
 script: make