diff --git a/src/mame/apple/macpdm.cpp b/src/mame/apple/macpdm.cpp
index bcdfd82f776..8ca7b6703a5 100644
--- a/src/mame/apple/macpdm.cpp
+++ b/src/mame/apple/macpdm.cpp
@@ -329,6 +329,8 @@ void macpdm_state::driver_reset()
 
 	m_video->set_vram_base((const u64 *)m_ram->pointer());
 	m_video->set_vram_offset(0);
+
+	m_maincpu->set_input_line(INPUT_LINE_HALT, ASSERT_LINE);
 }
 
 uint8_t macpdm_state::irq_control_r(offs_t offset)