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author hap <happppp@users.noreply.github.com>2021-04-28 12:10:31 +0200
committer hap <happppp@users.noreply.github.com>2021-04-28 12:10:47 +0200
commit07d0bf3763b7db4d8f93fbcd7a0be585ca47b10f (patch)
tree24516965dbf0387601f8bc7929aced533c7d3130
parent79339c28ab85e4dc0f675b7919b0f7c3232a0903 (diff)
fmtowns: fill pcm ram with 0xff at power-on
-rw-r--r--src/mame/drivers/fmtowns.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/mame/drivers/fmtowns.cpp b/src/mame/drivers/fmtowns.cpp
index 85891a02bea..f86b7f7ea0c 100644
--- a/src/mame/drivers/fmtowns.cpp
+++ b/src/mame/drivers/fmtowns.cpp
@@ -2762,6 +2762,11 @@ void towns_state::machine_start()
if (m_flop[1]->get_device())
m_flop[1]->get_device()->set_rpm(360);
+ // unitialized PCM RAM filled with 0xff (fmtmarty chasehq relies on that)
+ address_space &space = subdevice<rf5c68_device>("pcm")->space(0);
+ for (int i = 0; i < 0x10000; i++)
+ space.write_byte(i, 0xff);
+
m_timer0 = 0;
m_timer1 = 0;
m_serial_irq_enable = 0;