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sms.cpp: Init SP reg to allow Ecco (GG) to run without BIOS (fix MT07255)

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Enik Land 2019-04-08 18:54:34 -03:00
parent 31ff9e8cea
commit 157789acac
1 changed files with 6 additions and 0 deletions
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6
src/mame/machine/sms.cpp
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@ -2,6 +2,7 @@
// copyright-holders:Wilbert Pol, Charles MacDonald,Mathis Rosenhauer,Brad Oliver,Michael Luong,Fabio Priuli,Enik Land
#include "emu.h"
#include "crsshair.h"
#include "cpu/z80/z80.h"
#include "video/315_5124.h"
#include "sound/ym2413.h"
#include "includes/sms.h"
@ -1081,6 +1082,11 @@ void sms_state::machine_start()
if (m_is_gamegear)
{
save_item(NAME(m_gg_sio));
// The game Ecco requires SP to be initialized, so, to run on a BIOS-less Game
// Gear, probably a custom chip like the 315-5378 does the initialization, as
// done by the 315-5342 chip on the Power Base Converter for Sega Genesis/MD.
// Reference: http://www.smspower.org/forums/14084-PowerBaseConverterInfo
m_maincpu->set_state_int(Z80_SP, 0xdff0);
}
if (m_cartslot)