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seta/seta.cpp: workaround extdwnhl ending crash (#11160)

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Angelo Salese 2023-04-29 15:38:18 +02:00 committed by GitHub
parent 2602ef1687
commit b49f26e7fa
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src/mame/seta/seta.cpp
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@ -2652,6 +2652,11 @@ void setaroul_state::setaroul_map(address_map &map)
Extreme Downhill / Sokonuke
***************************************************************************/
// TODO: open bus for unmapped I/O areas?
// extdwnhl wants to read non-zero at POST for watchdog (?) otherwise will mangle RAM boundaries
// and fails booting.
// It also perform a blantantly invalid access during ending, expecting anything that isn't a 0xffff
// to skip it. (A0=0x20434f56, https://mametesters.org/view.php?id=8614)
void seta_state::extdwnhl_map(address_map &map)
{
map.unmap_value_high();
@ -2664,6 +2669,7 @@ void seta_state::extdwnhl_map(address_map &map)
map(0x400004, 0x400005).portr("COINS"); // Coins
map(0x400008, 0x40000b).r(FUNC(seta_state::seta_dsw_r)); // DSW
map(0x40000c, 0x40000d).rw("watchdog", FUNC(watchdog_timer_device::reset16_r), FUNC(watchdog_timer_device::reset16_w)); // Watchdog (extdwnhl (R) & sokonuke (W) MUST RETURN $FFFF)
map(0x434f56, 0x434f57).lr16(NAME([]() { return 0; }));
map(0x500001, 0x500001).w(FUNC(seta_state::seta_coin_counter_w)); // Coin Counter (no lockout)
map(0x500003, 0x500003).w(FUNC(seta_state::seta_vregs_w)); // Video Registers
map(0x500004, 0x500007).noprw(); // IRQ Ack (extdwnhl (R) & sokonuke (W))