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Diffstat (limited to 'src/mame/acorn/acorn_serproc.cpp')
-rw-r--r--src/mame/acorn/acorn_serproc.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/acorn/acorn_serproc.cpp b/src/mame/acorn/acorn_serproc.cpp
index b57c1b5ca6f..dbf0180f5d9 100644
--- a/src/mame/acorn/acorn_serproc.cpp
+++ b/src/mame/acorn/acorn_serproc.cpp
@@ -122,7 +122,8 @@ void acorn_serproc_device::write(uint8_t data)
uint8_t acorn_serproc_device::read()
{
// Reading has the same effect as writing 0xFE (high byte of address 0xFE10)
- write(0xfe);
+ if (!machine().side_effects_disabled())
+ write(0xfe);
return 0;
}