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megaplay: Make start buttons work properly through BIOS

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This commit is contained in:
AJR 2017-09-06 21:17:16 -04:00
parent c5ee96497a
commit df489c109f
1 changed files with 40 additions and 40 deletions
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80
src/mame/drivers/megaplay.cpp
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@ -3,19 +3,6 @@
/*
Driver is marked as NOT WORKING because interaction between BIOS and 68k side is
not fully understood. The BIOS often doesn't register that a game has been started
and leaves the 'PRESS P1 OR P2 START' message onscreen during gameplay as a result.
If this happens, the games usually then crash when you run out of lives as they end
up in an unknown state.
The BIOS reads the Start inputs in a different way to the 68k side, but even mirroring
the reads so that they happen at the same time doesn't fix the problem 100% of the
time. It's possible all inputs are meant to be read by the BIOS and passed to the 68k
rather than using the regular Genesis PAD hookups. There are a lot of ports not fully
understood that could be involved.
About MegaPlay:
Megaplay games are specially designed Genesis games, produced for arcade use.
@ -63,6 +50,9 @@ public:
m_bioscpu(*this, "mtbios")
{ }
DECLARE_READ_LINE_MEMBER(start1_r);
DECLARE_READ_LINE_MEMBER(start2_r);
DECLARE_READ16_MEMBER(extra_ram_r);
DECLARE_WRITE16_MEMBER(extra_ram_w);
DECLARE_WRITE8_MEMBER(bios_banksel_w);
@ -125,20 +115,20 @@ static INPUT_PORTS_START ( megaplay )
PORT_SERVICE_NO_TOGGLE( 0x80, IP_ACTIVE_LOW )
PORT_START("COIN")
PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
PORT_BIT ( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT ( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_SERVICE1 )
PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
/*
Caused 01081: - but the BIOS TEST menu reads them here, unlike all the other buttons.
Maybe the BIOS port writes should be passing them to the 68k side rather than the 68k side reading directly, might explain the emulation bugs
PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_START2 )
*/
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_SERVICE1 )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START2 )
PORT_MODIFY("PAD1") // P1 Start input processed through BIOS
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, mplay_state, start1_r)
PORT_MODIFY("PAD2") // P2 Start input processed through BIOS
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, mplay_state, start2_r)
PORT_START("DSW0")
PORT_DIPNAME( 0x0f, 0x0f, "Coin slot 1" ) PORT_DIPLOCATION("SW1:1,2,3,4")
@ -395,6 +385,16 @@ INPUT_PORTS_END
/*MEGAPLAY specific*/
READ_LINE_MEMBER(mplay_state::start1_r)
{
return BIT(m_bios_bank, 4);
}
READ_LINE_MEMBER(mplay_state::start2_r)
{
return BIT(m_bios_bank, 5);
}
WRITE8_MEMBER(mplay_state::bios_banksel_w)
{
/* Multi-slot note:
@ -952,21 +952,21 @@ didn't have original Sega part numbers it's probably a converted TWC cart
** Probably reused cart case
*/
/* -- */ GAME( 1993, megaplay, 0, megaplay, megaplay, mplay_state, megaplay, ROT0, "Sega", "Mega Play BIOS", MACHINE_IS_BIOS_ROOT | MACHINE_NOT_WORKING )
/* 01 */ GAME( 1993, mp_sonic, megaplay, megaplay, mp_sonic, mplay_state, megaplay, ROT0, "Sega", "Sonic The Hedgehog (Mega Play)", MACHINE_NOT_WORKING )
/* 02 */ GAME( 1993, mp_gaxe2, megaplay, megaplay, mp_gaxe2, mplay_state, megaplay, ROT0, "Sega", "Golden Axe II (Mega Play) (Rev B)", MACHINE_NOT_WORKING )
/* 02 */ GAME( 1993, mp_gaxe2a,mp_gaxe2, megaplay, mp_gaxe2, mplay_state, megaplay, ROT0, "Sega", "Golden Axe II (Mega Play)", MACHINE_NOT_WORKING )
/* 03 */ GAME( 1993, mp_gslam, megaplay, megaplay, mp_gslam, mplay_state, megaplay, ROT0, "Sega", "Grand Slam (Mega Play)", MACHINE_NOT_WORKING )
/* 04 */ GAME( 1993, mp_twcup, megaplay, megaplay, mp_twc, mplay_state, megaplay, ROT0, "Sega", "Tecmo World Cup (Mega Play)", MACHINE_NOT_WORKING )
/* 05 */ GAME( 1993, mp_sor2, megaplay, megaplay, mp_sor2, mplay_state, megaplay, ROT0, "Sega", "Streets of Rage II (Mega Play)", MACHINE_NOT_WORKING )
/* 06 */ GAME( 1993, mp_bio, megaplay, megaplay, mp_bio, mplay_state, megaplay, ROT0, "Sega", "Bio-hazard Battle (Mega Play)", MACHINE_NOT_WORKING )
/* 07 */ GAME( 1993, mp_soni2, megaplay, megaplay, mp_soni2, mplay_state, megaplay, ROT0, "Sega", "Sonic The Hedgehog 2 (Mega Play)", MACHINE_NOT_WORKING )
/* -- */ GAME( 1993, megaplay, 0, megaplay, megaplay, mplay_state, megaplay, ROT0, "Sega", "Mega Play BIOS", MACHINE_IS_BIOS_ROOT )
/* 01 */ GAME( 1993, mp_sonic, megaplay, megaplay, mp_sonic, mplay_state, megaplay, ROT0, "Sega", "Sonic The Hedgehog (Mega Play)", 0 )
/* 02 */ GAME( 1993, mp_gaxe2, megaplay, megaplay, mp_gaxe2, mplay_state, megaplay, ROT0, "Sega", "Golden Axe II (Mega Play) (Rev B)", 0 )
/* 02 */ GAME( 1993, mp_gaxe2a,mp_gaxe2, megaplay, mp_gaxe2, mplay_state, megaplay, ROT0, "Sega", "Golden Axe II (Mega Play)", 0 )
/* 03 */ GAME( 1993, mp_gslam, megaplay, megaplay, mp_gslam, mplay_state, megaplay, ROT0, "Sega", "Grand Slam (Mega Play)", 0 )
/* 04 */ GAME( 1993, mp_twcup, megaplay, megaplay, mp_twc, mplay_state, megaplay, ROT0, "Sega", "Tecmo World Cup (Mega Play)", 0 )
/* 05 */ GAME( 1993, mp_sor2, megaplay, megaplay, mp_sor2, mplay_state, megaplay, ROT0, "Sega", "Streets of Rage II (Mega Play)", 0 )
/* 06 */ GAME( 1993, mp_bio, megaplay, megaplay, mp_bio, mplay_state, megaplay, ROT0, "Sega", "Bio-hazard Battle (Mega Play)", 0 )
/* 07 */ GAME( 1993, mp_soni2, megaplay, megaplay, mp_soni2, mplay_state, megaplay, ROT0, "Sega", "Sonic The Hedgehog 2 (Mega Play)", 0 )
/* 08 - Columns 3? see below */
/* 09 */ GAME( 1993, mp_shnb3, megaplay, megaplay, mp_shnb3, mplay_state, megaplay, ROT0, "Sega", "Shinobi III (Mega Play)", MACHINE_NOT_WORKING )
/* 10 */ GAME( 1993, mp_gunhe, megaplay, megaplay, mp_gunhe, mplay_state, megaplay, ROT0, "Sega", "Gunstar Heroes (Mega Play)", MACHINE_NOT_WORKING )
/* 11 */ GAME( 1993, mp_mazin, megaplay, megaplay, mp_mazin, mplay_state, megaplay, ROT0, "Sega", "Mazin Wars / Mazin Saga (Mega Play)", MACHINE_NOT_WORKING )
/* 09 */ GAME( 1993, mp_shnb3, megaplay, megaplay, mp_shnb3, mplay_state, megaplay, ROT0, "Sega", "Shinobi III (Mega Play)", 0 )
/* 10 */ GAME( 1993, mp_gunhe, megaplay, megaplay, mp_gunhe, mplay_state, megaplay, ROT0, "Sega", "Gunstar Heroes (Mega Play)", 0 )
/* 11 */ GAME( 1993, mp_mazin, megaplay, megaplay, mp_mazin, mplay_state, megaplay, ROT0, "Sega", "Mazin Wars / Mazin Saga (Mega Play)", 0 )
/* ?? */ GAME( 1993, mp_col3, megaplay, megaplay, megaplay, mplay_state, megaplay, ROT0, "Sega", "Columns III (Mega Play)", MACHINE_NOT_WORKING )
/* ?? */ GAME( 1993, mp_col3, megaplay, megaplay, megaplay, mplay_state, megaplay, ROT0, "Sega", "Columns III (Mega Play)", 0 )
/* Not confirmed to exist: