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-rw-r--r--src/mame/machine/mbee.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/machine/mbee.cpp b/src/mame/machine/mbee.cpp
index b86cb60b699..32da7fbfb7a 100644
--- a/src/mame/machine/mbee.cpp
+++ b/src/mame/machine/mbee.cpp
@@ -249,7 +249,7 @@ uint8_t mbee_state::port07_r() // read
// See it work: Run mbeett, choose RTC in the config switches, run the F3 test, press Esc.
WRITE_LINE_MEMBER( mbee_state::rtc_irq_w )
{
- m_b7_rtc = (state) ? 0 : 1; // inverted by IC15 (pins 8,9,10)
+ m_b7_rtc = state; // inverted by IC15 (pins 8,9,10) then again by mame
if ((m_io_config->read() & 0xc0) == 0x40) // RTC selected in config menu
m_pio->port_b_write(pio_port_b_r());