diff --git a/ports/unix/variants/fast/mpconfigvariant.h b/ports/unix/variants/fast/mpconfigvariant.h
deleted file mode 100644
index 8a531b056a..0000000000
--- a/ports/unix/variants/fast/mpconfigvariant.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * This file is part of the MicroPython project, http://micropython.org/
- *
- * The MIT License (MIT)
- *
- * Copyright (c) 2013, 2014 Damien P. George
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-// This config file is intended to configure artificially fast uPy build for
-// synthetic benchmarking, at the expense of features supported and memory
-// usage. This config is not intended to be used in production.
-
-#define MICROPY_PY___FILE__ (0)
-// 91 is a magic number proposed by @dpgeorge, which make pystone run ~ at tie
-// with CPython 3.4.
-#define MICROPY_MODULE_DICT_SIZE (91)
diff --git a/ports/unix/variants/fast/mpconfigvariant.mk b/ports/unix/variants/fast/mpconfigvariant.mk
deleted file mode 100644
index b8fe69e487..0000000000
--- a/ports/unix/variants/fast/mpconfigvariant.mk
+++ /dev/null
@@ -1,5 +0,0 @@
-# build synthetically fast interpreter for benchmarking
-
-COPT += -fno-crossjumping -O2
-
-FROZEN_MANIFEST =
diff --git a/ports/unix/variants/freedos/mpconfigvariant.h b/ports/unix/variants/freedos/mpconfigvariant.h
deleted file mode 100644
index 562c783ca3..0000000000
--- a/ports/unix/variants/freedos/mpconfigvariant.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * This file is part of the MicroPython project, http://micropython.org/
- *
- * The MIT License (MIT)
- *
- * Copyright (c) 2015 Damien P. George
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-// options to control how MicroPython is built
-
-#define MICROPY_PY_USELECT_POSIX (0)
-
-#define MICROPY_STREAMS_NON_BLOCK (0)
-
-#define MICROPY_PY_SYS_PLATFORM "freedos"
-
-// djgpp dirent struct does not have d_ino field
-#undef _DIRENT_HAVE_D_INO
-
-#define MICROPY_USE_INTERNAL_ERRNO  (1)
diff --git a/ports/unix/variants/freedos/mpconfigvariant.mk b/ports/unix/variants/freedos/mpconfigvariant.mk
deleted file mode 100644
index 86ab6864f4..0000000000
--- a/ports/unix/variants/freedos/mpconfigvariant.mk
+++ /dev/null
@@ -1,18 +0,0 @@
-CC = i586-pc-msdosdjgpp-gcc
-
-STRIP = i586-pc-msdosdjgpp-strip
-
-SIZE = i586-pc-msdosdjgpp-size
-
-CFLAGS += \
-	-DMICROPY_NLR_SETJMP \
-	-Dtgamma=gamma \
-	-DMICROPY_EMIT_X86=0 \
-	-DMICROPY_NO_ALLOCA=1 \
-
-MICROPY_PY_SOCKET = 0
-MICROPY_PY_FFI = 0
-MICROPY_PY_JNI = 0
-MICROPY_PY_BTREE = 0
-MICROPY_PY_THREAD = 0
-MICROPY_PY_USSL = 0