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-rw-r--r--src/devices/machine/upd765.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/devices/machine/upd765.cpp b/src/devices/machine/upd765.cpp
index 4996093e0bd..acf4182fecc 100644
--- a/src/devices/machine/upd765.cpp
+++ b/src/devices/machine/upd765.cpp
@@ -548,6 +548,8 @@ uint8_t upd765_family_device::fifo_r()
uint8_t r = 0xff;
switch(main_phase) {
case PHASE_CMD:
+ if(machine().side_effects_disabled())
+ return 0x00;
if(command_pos)
fifo_w(0xff);
LOGFIFO("fifo_r in command phase\n");