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Diffstat (limited to 'src/mame/drivers/pdp11.cpp')
-rw-r--r--src/mame/drivers/pdp11.cpp6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/mame/drivers/pdp11.cpp b/src/mame/drivers/pdp11.cpp
index b2de6e818c2..526e5d967d4 100644
--- a/src/mame/drivers/pdp11.cpp
+++ b/src/mame/drivers/pdp11.cpp
@@ -365,11 +365,13 @@ MACHINE_CONFIG_START(pdp11_state::pdp11)
MCFG_RX01_ADD("rx01")
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(pdp11_state::pdp11ub2, pdp11)
+MACHINE_CONFIG_START(pdp11_state::pdp11ub2)
+ pdp11(config);
MCFG_MACHINE_RESET_OVERRIDE(pdp11_state,pdp11ub2)
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(pdp11_state::pdp11qb, pdp11)
+MACHINE_CONFIG_START(pdp11_state::pdp11qb)
+ pdp11(config);
MCFG_MACHINE_RESET_OVERRIDE(pdp11_state,pdp11qb)
MCFG_CPU_MODIFY("maincpu")