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-rw-r--r--src/devices/bus/electron/pwrjoy.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/devices/bus/electron/pwrjoy.cpp b/src/devices/bus/electron/pwrjoy.cpp
index 2791f700372..2be3f645c55 100644
--- a/src/devices/bus/electron/pwrjoy.cpp
+++ b/src/devices/bus/electron/pwrjoy.cpp
@@ -78,8 +78,10 @@ void electron_pwrjoy_device::device_start()
// expbus_r - expansion data read
//-------------------------------------------------
-uint8_t electron_pwrjoy_device::expbus_r(address_space &space, offs_t offset, uint8_t data)
+uint8_t electron_pwrjoy_device::expbus_r(address_space &space, offs_t offset)
{
+ uint8_t data = 0xff;
+
if (offset >= 0x8000 && offset < 0xc000)
{
if (m_romsel == 15)