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some notes, cleanups, accuracy improvements
This commit is contained in:
Michaël Banaan Ananas
parent
08d47383fa
commit
a2c8d6832f
@ -1,11 +1,13 @@
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/*
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Penguin Adventure bootleg
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Penguin Adventure bootleg (tagged 'Screen', 1988)
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Original release was on MSX, by Konami in 1986. There is no official arcade release of this game.
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Driver by Mariusz Wojcieszek
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This seems to be the MSX version possibly hacked
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to run on cheap Korean bootleg hardware.
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This seems to be the MSX version hacked to run on cheap Korean(?) bootleg hardware.
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Bosses are at wrong stages when compared to the original, probably to make the game more
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difficult early on. This is also the cause of some gfx glitches when reaching a boss.
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Basic components include.....
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Z80 @ 3.579533MHz [10.7386/3]
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@ -15,7 +17,7 @@ AY-3-8910 @ 1.789766MHz [10.7386/6]
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4416 RAM x2
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4164 RAM x8
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10.7386 XTAL
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10 position DIPSW
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10 position DIPSW (where are they read??)
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NOTE! switches 1, 3 & 5 must be ON or the game will not boot.
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*/
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@ -42,96 +44,82 @@ public:
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static void mem_map_banks(running_machine &machine)
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{
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pengadvb_state *state = machine.driver_data<pengadvb_state>();
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int slot_select;
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/* memorymap: (rest is assumed unmapped)
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slot 0
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0000-7fff BIOS ROM
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slot 1
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4000-bfff game ROM
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slot 3
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c000-ffff RAM
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*/
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// page 0
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slot_select = (state->m_mem_map >> 0) & 0x03;
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switch(slot_select)
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// page 0 (0000-3fff)
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switch(state->m_mem_map & 3)
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{
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case 0:
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{
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// BIOS
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machine.device("maincpu")->memory().space(AS_PROGRAM)->install_read_bank(0x0000, 0x3fff, "bank1" );
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memory_set_bankptr(machine, "bank1", machine.region("maincpu")->base());
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break;
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};
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case 1:
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case 2:
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case 3:
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{
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default:
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machine.device("maincpu")->memory().space(AS_PROGRAM)->unmap_read(0x0000, 0x3fff);
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break;
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}
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}
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// page 1
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slot_select = (state->m_mem_map >> 2) & 0x03;
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switch(slot_select)
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// page 1 (4000-7fff)
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switch(state->m_mem_map >> 2 & 3)
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{
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case 0:
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{
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// BIOS
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machine.device("maincpu")->memory().space(AS_PROGRAM)->install_read_bank(0x4000, 0x5fff, "bank21" );
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machine.device("maincpu")->memory().space(AS_PROGRAM)->install_read_bank(0x6000, 0x7fff, "bank22" );
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memory_set_bankptr(machine, "bank21", machine.region("maincpu")->base() + 0x4000);
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memory_set_bankptr(machine, "bank22", machine.region("maincpu")->base() + 0x4000 + 0x2000);
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break;
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}
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case 1:
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{
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// game
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machine.device("maincpu")->memory().space(AS_PROGRAM)->install_read_bank(0x4000, 0x5fff, "bank21" );
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machine.device("maincpu")->memory().space(AS_PROGRAM)->install_read_bank(0x6000, 0x7fff, "bank22" );
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memory_set_bankptr(machine, "bank21", machine.region("game")->base() + state->m_mem_banks[0]*0x2000);
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memory_set_bankptr(machine, "bank22", machine.region("game")->base() + state->m_mem_banks[1]*0x2000);
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break;
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}
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case 2:
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case 3:
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{
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default:
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machine.device("maincpu")->memory().space(AS_PROGRAM)->unmap_read(0x4000, 0x7fff);
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break;
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}
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}
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// page 2
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slot_select = (state->m_mem_map >> 4) & 0x03;
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switch(slot_select)
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// page 2 (8000-bfff)
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switch(state->m_mem_map >> 4 & 3)
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{
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case 1:
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{
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// game
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machine.device("maincpu")->memory().space(AS_PROGRAM)->install_read_bank(0x8000, 0x9fff, "bank31" );
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machine.device("maincpu")->memory().space(AS_PROGRAM)->install_read_bank(0xa000, 0xbfff, "bank32" );
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memory_set_bankptr(machine, "bank31", machine.region("game")->base() + state->m_mem_banks[2]*0x2000);
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memory_set_bankptr(machine, "bank32", machine.region("game")->base() + state->m_mem_banks[3]*0x2000);
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break;
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}
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case 0:
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case 2:
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case 3:
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{
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default:
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machine.device("maincpu")->memory().space(AS_PROGRAM)->unmap_read(0x8000, 0xbfff);
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break;
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}
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}
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// page 3
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slot_select = (state->m_mem_map >> 6) & 0x03;
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switch(slot_select)
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// page 3 (c000-ffff)
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switch(state->m_mem_map >> 6 & 3)
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{
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case 0:
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case 1:
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case 2:
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{
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machine.device("maincpu")->memory().space(AS_PROGRAM)->unmap_read(0xc000, 0xffff);
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break;
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}
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case 3:
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{
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// RAM
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machine.device("maincpu")->memory().space(AS_PROGRAM)->install_read_bank(0xc000, 0xffff, "bank4" );
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memory_set_bankptr(machine, "bank4", state->m_main_mem);
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break;
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}
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}
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default:
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machine.device("maincpu")->memory().space(AS_PROGRAM)->unmap_read(0xc000, 0xffff);
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break;
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}
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}
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static WRITE8_HANDLER(mem_w)
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@ -139,22 +127,15 @@ static WRITE8_HANDLER(mem_w)
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pengadvb_state *state = space->machine().driver_data<pengadvb_state>();
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if (offset >= 0xc000)
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{
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int slot_select = (state->m_mem_map >> 6) & 0x03;
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if ( slot_select == 3 )
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{
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// write to RAM
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if ((state->m_mem_map >> 6 & 3) == 3)
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state->m_main_mem[offset - 0xc000] = data;
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}
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}
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else
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else if (offset >= 0x4000 && (state->m_mem_map >> (offset >> 13 & 6) & 3) == 1 && (state->m_mem_banks[(offset - 0x4000) >> 13] != (data & 0xf)))
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{
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switch(offset)
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{
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case 0x4000: state->m_mem_banks[0] = data; mem_map_banks(space->machine()); break;
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case 0x6000: state->m_mem_banks[1] = data; mem_map_banks(space->machine()); break;
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case 0x8000: state->m_mem_banks[2] = data; mem_map_banks(space->machine()); break;
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case 0xa000: state->m_mem_banks[3] = data; mem_map_banks(space->machine()); break;
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}
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// ROM bankswitch
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state->m_mem_banks[(offset - 0x4000) >> 13] = data & 0xf;
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mem_map_banks(space->machine());
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}
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}
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@ -210,11 +191,20 @@ static const ay8910_interface pengadvb_ay8910_interface =
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DEVCB_NULL
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};
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static READ8_DEVICE_HANDLER( pengadvb_ppi_port_a_r )
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{
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pengadvb_state *state = device->machine().driver_data<pengadvb_state>();
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return state->m_mem_map;
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}
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static WRITE8_DEVICE_HANDLER ( pengadvb_ppi_port_a_w )
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{
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pengadvb_state *state = device->machine().driver_data<pengadvb_state>();
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state->m_mem_map = data;
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mem_map_banks(device->machine());
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if (data != state->m_mem_map)
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{
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state->m_mem_map = data;
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mem_map_banks(device->machine());
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}
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}
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static READ8_DEVICE_HANDLER( pengadvb_ppi_port_b_r )
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@ -229,7 +219,7 @@ static READ8_DEVICE_HANDLER( pengadvb_ppi_port_b_r )
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static I8255A_INTERFACE(pengadvb_ppi8255_interface)
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{
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DEVCB_NULL,
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DEVCB_HANDLER(pengadvb_ppi_port_a_r),
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DEVCB_HANDLER(pengadvb_ppi_port_a_w),
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DEVCB_HANDLER(pengadvb_ppi_port_b_r),
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DEVCB_NULL,
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@ -239,7 +229,7 @@ static I8255A_INTERFACE(pengadvb_ppi8255_interface)
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static WRITE_LINE_DEVICE_HANDLER(vdp_interrupt)
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{
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cputag_set_input_line(device->machine(), "maincpu", 0, (state ? HOLD_LINE : CLEAR_LINE));
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cputag_set_input_line(device->machine(), "maincpu", 0, (state ? ASSERT_LINE : CLEAR_LINE));
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}
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static TMS9928A_INTERFACE(pengadvb_tms9928a_interface)
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@ -326,7 +316,6 @@ static void pengadvb_decrypt(running_machine &machine, const char* region)
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mem[i] = buf[BITSWAP24(i,23,22,21,20,19,18,17,16,15,14,13,5,11,10,9,8,7,6,12,4,3,2,1,0)];
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}
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auto_free(machine, buf);
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}
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static DRIVER_INIT(pengadvb)
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@ -350,4 +339,4 @@ ROM_START( pengadvb )
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ROM_END
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GAME( 1988, pengadvb, 0, pengadvb, pengadvb, pengadvb, ROT0, "bootleg / Konami", "Penguin Adventure (bootleg of MSX version)", GAME_SUPPORTS_SAVE )
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GAME( 1988, pengadvb, 0, pengadvb, pengadvb, pengadvb, ROT0, "bootleg (Screen) / Konami", "Penguin Adventure (bootleg of MSX version)", GAME_SUPPORTS_SAVE )
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