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alpha68k.cpp: Demote Sky Soldiers with MACHINE_UNEMULATED_PROTECTION flag since MCU actually controls bosses time out behaviour.

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Angelo Salese 2021-07-23 21:54:28 +02:00 committed by GitHub
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1 changed files with 20 additions and 8 deletions
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src/mame/drivers/alpha68k.cpp
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@ -23,21 +23,23 @@
The Next Space A8004-1 PIC SNK 1989
TODO:
- Super Champion Baseball "ball speed pitch" protection;
- II & V board: bit 15 of palette RAM isn't hooked up, according to Sky Adventure
service mode enables "bright", it is actually same as NeoGeo device;
- II & V board: Fix sound CPU crashes properly (nested NMIs)
- Sky Soldiers: BGM Fade out before boss battle isn't implemented
- II & V board: Fix sound CPU crashes properly (nested NMIs);
- Sky Soldiers: According to various references bosses should really time out after some time (reportedly ~80 secs.).
This is actually handled by the MCU, not unlike Gold Medalist;
- Sky Soldiers: BGM Fade out before boss battle isn't implemented;
- Sky Adventure, probably others: on a real PCB reference BGM stutters when using
30 Hz autofire (not enough sound resources?)
30 Hz autofire (not enough sound resources?);
- Sky Adventure, probably others: sprite drawing is off-sync, cfr. notes in video file;
- Gold Medalist: attract mode has missing finger on button 1, may be btanb;
- Gold Medalist: incorrect blank effect on shooting pistol for dash events (cfr. alpha68k_palette_device);
- Gold Medalist: dash events timers relies on MCU irq timings.
Previous emulation of 180 Hz was making it way too hard, and the timer was updating at 0.03 secs (-> 30 Hz refresh rate).
Using a timer of 100 Hz seems a better approximation compared to a stopwatch, of course fine tuning
this approximation needs HW probing and/or a MCU decap.
this approximation needs HW probing and/or a MCU decap;
- Gold Medalist: MCU irq routine has an event driven path that is never taken into account, what is it for?
- Super Champion Baseball: "ball speed pitch" protection;
- Super Champion Baseball: enables opacity bit on fix layer, those are transparent on SNK Arcade Classics 0
but actually opaque on a reference shot, sounds like a btanb;
- Fix layer tilemap should be a common device between this, snk68.cpp and other Alpha/SNK-based games;
@ -338,7 +340,18 @@ u16 alpha68k_II_state::alpha_II_trigger_r(offs_t offset)
m_microcontroller_data = 0x21;
}
else
{
// TODO: Sky Soldiers uses this thread dispatch as well for boss timing out and who knows what else
// cfr. PC=0x1d52, possible threads at ROM address $1e7e-$1e89 (in bytes)
// 0x34 should be the step counter handling while 0x37 is what actually times out (or even destroys) the boss on expiration.
// Notice that there are additional shared RAM checks (i.e. 0x1e6a, 0x1e32, 0x1e3a), which causes the game to soft lock if not satisfied.
// Apparently bosses should time out in ~80 seconds.
m_microcontroller_data = 0x00;
// Notice that a similar system is also used by Time Soldiers but most threads are actually NOP-ed out.
// (basically anything that is >0x24)
// Most likely left-overs that eventually were completed with aforementioned Sky Soldiers.
}
m_shared_ram[0x29] = (source & 0xff00) | m_microcontroller_data;
}
@ -2148,9 +2161,8 @@ GAME( 1987, timesold1, timesold, alpha68k_II, timesold, alpha68k_II_state, i
GAME( 1987, btlfield, timesold, alpha68k_II, btlfield, alpha68k_II_state, init_btlfield, ROT90, "Alpha Denshi Co. (SNK license)", "Battle Field (Japan)", MACHINE_SUPPORTS_SAVE )
GAME( 1987, btlfieldb, timesold, btlfieldb, btlfieldb, alpha68k_II_state, init_btlfieldb, ROT90, "bootleg", "Battle Field (bootleg)", MACHINE_SUPPORTS_SAVE )
GAME( 1988, skysoldr, 0, alpha68k_II, skysoldr, alpha68k_II_state, init_skysoldr, ROT90, "Alpha Denshi Co. (SNK of America/Romstar license)", "Sky Soldiers (US)", MACHINE_SUPPORTS_SAVE )
GAME( 1988, skysoldrbl,skysoldr, alpha68k_II, skysoldr, alpha68k_II_state, init_skysoldr, ROT90, "bootleg", "Sky Soldiers (bootleg)", MACHINE_SUPPORTS_SAVE )
GAME( 1988, skysoldr, 0, alpha68k_II, skysoldr, alpha68k_II_state, init_skysoldr, ROT90, "Alpha Denshi Co. (SNK of America/Romstar license)", "Sky Soldiers (US)", MACHINE_SUPPORTS_SAVE | MACHINE_UNEMULATED_PROTECTION ) // unemulated boss time out behaviour
GAME( 1988, skysoldrbl,skysoldr, alpha68k_II, skysoldr, alpha68k_II_state, init_skysoldr, ROT90, "bootleg", "Sky Soldiers (bootleg)", MACHINE_SUPPORTS_SAVE | MACHINE_UNEMULATED_PROTECTION ) // unknown if/how bootleggers handled boss time out, seems likely
GAME( 1988, goldmedl, 0, goldmedal, goldmedl, goldmedal_II_state, init_goldmedl, ROT0, "SNK", "Gold Medalist (set 1, Alpha68k II PCB)", MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_TIMING )