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-rw-r--r--src/devices/machine/z80ctc.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/devices/machine/z80ctc.h b/src/devices/machine/z80ctc.h
index 724a6dbb9c0..76e4e66e2d1 100644
--- a/src/devices/machine/z80ctc.h
+++ b/src/devices/machine/z80ctc.h
@@ -47,6 +47,10 @@
#define MCFG_Z80CTC_ZC2_CB(_devcb) \
devcb = &downcast<z80ctc_device &>(*device).set_zc_callback<2>(DEVCB_##_devcb);
+// not supported on a standard ctc, only used for the tmpz84c015
+#define MCFG_Z80CTC_ZC3_CB(_devcb) \
+ devcb = &downcast<z80ctc_device &>(*device).set_zc_callback<3>(DEVCB_##_devcb);
+
//**************************************************************************
// TYPE DEFINITIONS