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(MESS) gameboy.c: Partially implemented banking for Story of La Sa Ma. [Wilbert Pol]

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This commit is contained in:
Wilbert Pol 2012-10-15 19:05:33 +00:00
parent bd44e9be90
commit a441e87ec2
2 changed files with 61 additions and 25 deletions
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2
src/mess/includes/gb.h
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@ -206,6 +206,8 @@ public:
DECLARE_WRITE8_MEMBER(gb_ram_bank_select_mbc1_kor);
DECLARE_WRITE8_MEMBER(gb_mem_mode_select_mbc1_kor);
DECLARE_WRITE8_MEMBER(gb_rom_bank_yongyong_2000);
DECLARE_WRITE8_MEMBER(gb_rom_bank_lasama_6000);
DECLARE_WRITE8_MEMBER(gb_rom_bank_lasama_2080);
DECLARE_WRITE8_MEMBER(gb_rom_bank_atvracin_3f00);
DECLARE_WRITE8_MEMBER(gb_rom_bank_atvracin_3fc0);
DECLARE_WRITE8_MEMBER(gb_io_w);

84
src/mess/machine/gb.c
View File

@ -4,12 +4,47 @@
Machine file to handle emulation of the Nintendo Game Boy.
Cardridge port pinouts:
Pin Name Description
1 VCC +5 VDC
2 PHI CPU clock ?
3 /WR Write
4 /RD Read
5 /CS SRAM select
6 A0 Address 0
7 A1 Address 1
8 A2 Address 2
9 A3 Address 3
10 A4 Address 4
11 A5 Address 5
12 A6 Address 6
13 A7 Address 7
14 A8 Address 8
15 A9 Address 9
16 A10 Address 10
17 A11 Address 11
18 A12 Address 12
19 A13 Address 13
20 A14 Address 14
21 A15 Address 15
22 D0 Data 0
23 D1 Data 1
24 D2 Data 2
25 D3 Data 3
26 D4 Data 4
27 D5 Data 5
28 D6 Data 6
29 D7 Data 7
30 /RST Reset
31 AUDIOIN Never used ?
32 GND Ground
TODO:
- YongYong mapper:
- During start there are 2 writes to 5000 and 5003, it is still unknown what these do.
- Story of La Sa Ma mapper:
- Does this display Nintendo or Gowin logo on boot?
- No clue how the banking works yet
- This should display the Gowin logo on boot on both DMG and CGB (Not implemented yet)
- ATV Racing/Rocket Games mapper:
- How did this overlay the official Nintendo logo at BIOS check time? (Some Sachen titles use a similar trick)
@ -95,29 +130,6 @@ enum {
static void gb_machine_stop(running_machine &machine);
static void gb_timer_increment( running_machine &machine );
#ifdef MAME_DEBUG
@ -249,6 +261,8 @@ static void gb_init(running_machine &machine)
//space.install_write_handler( 0x5000, 0x5003, write8_delegate(FUNC(gb_state::gb_rom_back_yongyong_5000),state) );
break;
case MBC_LASAMA:
space.install_write_handler( 0x2080, 0x2080, write8_delegate(FUNC(gb_state::gb_rom_bank_lasama_2080),state) );
space.install_write_handler( 0x6000, 0x6000, write8_delegate(FUNC(gb_state::gb_rom_bank_lasama_6000),state) );
break;
case MBC_ATVRACIN:
space.install_write_handler( 0x3F00, 0x3F00, write8_delegate(FUNC(gb_state::gb_rom_bank_atvracin_3f00),state) );
@ -802,6 +816,26 @@ WRITE8_MEMBER(gb_state::gb_rom_bank_yongyong_2000)
gb_rom16_4000( machine(), m_ROMMap[m_ROMBank] );
}
WRITE8_MEMBER(gb_state::gb_rom_bank_lasama_2080)
{
// Actual banking?
m_ROMBank = m_ROMBank00 | ( data & 0x03 );
gb_rom16_4000( machine(), m_ROMMap[m_ROMBank] );
}
WRITE8_MEMBER(gb_state::gb_rom_bank_lasama_6000)
{
// On boot the following two get written right after each other:
// 02
// BE
// Disable logo switching?
if ( ! ( data & 0x80 ) )
{
m_ROMBank00 = ( data & 0x02 ) << 1;
gb_rom16_0000( machine(), m_ROMMap[m_ROMBank00] );
}
}
WRITE8_MEMBER(gb_state::gb_rom_bank_atvracin_3f00)
{
if ( data == 0 )