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Add mapper #42 MAPPER_GG_Gear_6_in_1_FFFE_FFF7_FFFF for "Gear 6 in 1 [Alien Syndrome] (Unl)" #106

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Add mapper #42 MAPPER_GG_Gear_6_in_1_FFFE_FFF7_FFFF for "Gear 6 in 1 [Alien Syndrome] (Unl)" #106

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3 changes: 2 additions & 1 deletion meka/compat.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -1136,6 +1136,7 @@
Garou Densetsu Special (JP) Ok
Ganbare Gorby! (JP) Ok
Garfield: Caught in the Act Ok
Gear 6 in 1 [Alien Syndrome] *Ok
Gear Stadium (JP) Ok
Gear Stadium Heiseiban (JP) Ok
Gear Works Ok
Expand Down Expand Up @@ -1498,7 +1499,7 @@
Zoop (US) Ok
Zoop [Proto] (US) Ok
-----------------------------------------------------------------------------
517 games tested - 506 are "Ok" - Compatibility rate: 97.63%
518 games tested - 507 are "Ok" - Compatibility rate: 97.88%
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
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1 change: 1 addition & 0 deletions meka/meka.nam
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Expand Up @@ -1031,6 +1031,7 @@ GG 0593ba24 905D6D377D1F9D36 Galaga '91/COUNTRY=JP/PRODUCT_NO=T-14057/COMMENT
GG 95ecece2 432C080C09AD5275 Galaga 2/COUNTRY=EU/PRODUCT_NO=2322/COMMENT=Export version of "Galaga '91".
GG cd53f3af 5434506F49A77C4D Garfield: Caught in the Act/COUNTRY=US,EU/PRODUCT_NO=2560,2560-50
GG 9afb6f33 CE07E49360532BD6 Garou Densetsu Special/COUNTRY=JP/PRODUCT_NO=T-103017/COMMENT=Japanese version of "Fatal Fury Special".
GG 983ffa6c 380E4248BE33AC93 Gear 6 in 1 [Alien Syndrome]/EMU_MAPPER=42
GG 0e300223 27BA4F0E3A5DBF6C Gear Stadium/COUNTRY=JP/PRODUCT_NO=T-14037/COMMENT=Japanese version of "Batter Up".
GG a0530664 08ADE585B8DA024D Gear Stadium Heiseiban/COUNTRY=JP/PRODUCT_NO=T-14077
GG e9a2efb4 F9F734AF23CDB28B Gear Works/COUNTRY=US/PRODUCT_NO=T-93058
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17 changes: 17 additions & 0 deletions meka/srcs/machine.cpp
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Expand Up @@ -196,6 +196,9 @@ void Machine_Set_Handler_MemRW(void)
case MAPPER_SMS_Korean_MSX_32KB_2000:
WrZ80 = WrZ80_NoHook = Write_Mapper_SMS_Korean_MSX_32KB_2000;
break;
case MAPPER_GG_Gear_6_in_1_FFFE_FFF7_FFFF:
WrZ80 = WrZ80_NoHook = Write_Mapper_GG_Gear_6_in_1_FFFE_FFF7_FFFF;
break;
}
}

Expand Down Expand Up @@ -485,6 +488,20 @@ void Machine_Set_Mapping (void)
g_machine.mapper_regs[0] = 0;
break;

case MAPPER_GG_Gear_6_in_1_FFFE_FFF7_FFFF:
Map_8k_ROM(0, 0 & tsms.Pages_Mask_8k);
Map_8k_ROM(1, 1 & tsms.Pages_Mask_8k);
Map_8k_ROM(2, 0 & tsms.Pages_Mask_8k);
Map_8k_ROM(3, 1 & tsms.Pages_Mask_8k);
Map_8k_ROM(4, 0 & tsms.Pages_Mask_8k);
Map_8k_ROM(5, 1 & tsms.Pages_Mask_8k);
Map_8k_RAM(6, 0);
Map_8k_RAM(7, 0);
g_machine.mapper_regs_count = 3;
for (int i = 0; i != MAPPER_REGS_MAX; i++)
g_machine.mapper_regs[i] = 0;
break;

case MAPPER_SC3000_Survivors_Multicart:
g_machine.mapper_regs_count = 1;
for (int i = 0; i != MAPPER_REGS_MAX; i++)
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41 changes: 41 additions & 0 deletions meka/srcs/mappers.cpp
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Expand Up @@ -952,6 +952,47 @@ WRITE_FUNC (Write_Mapper_SMS_Korean_MSX_32KB_2000)
Write_Error (Addr, Value);
}

// Mapper #42
// Gear 6 in 1 [Alien Syndrome]
WRITE_FUNC(Write_Mapper_GG_Gear_6_in_1_FFFE_FFF7_FFFF)
{
if ((Addr == 0xFFF7) || (Addr == 0xFFFE) || (Addr == 0xFFFF)) // Configurable segment -----------------------------------------------
{
if (Addr == 0xFFF7)
{
if (! (g_machine.mapper_regs[0] & 0x80)) {
// switch from "menu" mapper mode to "Sega" mapper mode
g_machine.mapper_regs[0] = 0x80 | ((Value & 0x01) << 4) | (g_machine.mapper_regs[2] & 0x0F);
g_machine.mapper_regs[2] = 1;
}
}
else if (Addr == 0xFFFF)
{
g_machine.mapper_regs[1] = Value;
}
else if (Addr == 0xFFFE)
{
g_machine.mapper_regs[2] = Value;
}
int mask = (g_machine.mapper_regs[0] & 0x80) ? 0x07 : 0x01;
Map_8k_ROM(0, ((g_machine.mapper_regs[0] & 0x1F) * 2) & tsms.Pages_Mask_8k);
Map_8k_ROM(1, (((g_machine.mapper_regs[0] & 0x1F) * 2) | 1) & tsms.Pages_Mask_8k);
Map_8k_ROM(2, (((g_machine.mapper_regs[0] & 0x1F) * 2) | ((g_machine.mapper_regs[2] & mask) * 2)) & tsms.Pages_Mask_8k);
Map_8k_ROM(3, (((g_machine.mapper_regs[0] & 0x1F) * 2) | ((g_machine.mapper_regs[2] & mask) * 2) | 1) & tsms.Pages_Mask_8k);
Map_8k_ROM(4, (((g_machine.mapper_regs[0] & 0x1F) * 2) | ((g_machine.mapper_regs[1] & mask) * 2)) & tsms.Pages_Mask_8k);
Map_8k_ROM(5, (((g_machine.mapper_regs[0] & 0x1F) * 2) | ((g_machine.mapper_regs[1] & mask) * 2) | 1) & tsms.Pages_Mask_8k);
}

switch (Addr >> 13)
{
// RAM [0xC000] = [0xE000] ------------------------------------------------
case 6: Mem_Pages[6][Addr] = Value; return;
case 7: Mem_Pages[7][Addr] = Value; return;
}

Write_Error(Addr, Value);
}

// Based on MSX ASCII 8KB mapper? http://bifi.msxnet.org/msxnet/tech/megaroms.html#ascii8
// - This mapper requires 4 registers to save bank switching state.
// However, all other mappers so far used only 3 registers, stored as 3 bytes.
Expand Down
2 changes: 2 additions & 0 deletions meka/srcs/mappers.h
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Expand Up @@ -50,6 +50,7 @@
#define MAPPER_SMS_Korean_MD_FFF5 (25) // Registers at 0xFFF5 and 0xFFFF (Jaemiissneun Game Mo-eumjip 42/65 Hap [SMS-MD], Pigu Wang Hap ~ Jaemiiss-neun Game Mo-eumjip [SMS-MD])
#define MAPPER_SMS_Korean_MD_FFFA (26) // Registers at 0xFFFA and 0xFFFF (Game Jiphap 30 Hap [SMS-MD])
#define MAPPER_SMS_Korean_MSX_32KB_2000 (27) // Register at 0x2000 (2 Hap in 1 (Moai-ui bomul, David-2))
#define MAPPER_GG_Gear_6_in_1_FFFE_FFF7_FFFF (42) // Registers at 0xFFFE, 0xFFF7, and 0xFFFF (Gear 6 in 1 [Alien Syndrome])

#define READ_FUNC(_NAME) u8 _NAME(register u16 Addr)
#define WRITE_FUNC(_NAME) void _NAME(register u16 Addr, register u8 Value)
Expand Down Expand Up @@ -96,6 +97,7 @@ WRITE_FUNC (Write_Mapper_SMS_Korean_MD_FFF0);
WRITE_FUNC (Write_Mapper_SMS_Korean_MD_FFF5);
WRITE_FUNC (Write_Mapper_SMS_Korean_MD_FFFA);
WRITE_FUNC (Write_Mapper_SMS_Korean_MSX_32KB_2000);
WRITE_FUNC (Write_Mapper_GG_Gear_6_in_1_FFFE_FFF7_FFFF);
//-----------------------------------------------------------------------------
void Out_SC3000_SurvivorsMulticarts_DataWrite(u8 v);

Expand Down
7 changes: 7 additions & 0 deletions meka/srcs/saves.cpp
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Expand Up @@ -144,6 +144,11 @@ void Load_Game_Fixup(void)
case MAPPER_SMS_Korean_MSX_32KB_2000:
WrZ80_NoHook(0x2000, g_machine.mapper_regs[0]);
break;
case MAPPER_GG_Gear_6_in_1_FFFE_FFF7_FFFF:
// rewriting these will automatically read and apply the hidden register's state
WrZ80_NoHook(0xFFFF, g_machine.mapper_regs[1]);
WrZ80_NoHook(0xFFFE, g_machine.mapper_regs[2]);
break;
}
}

Expand Down Expand Up @@ -339,6 +344,7 @@ int Save_Game_MSV(FILE *f)
case MAPPER_SMS_Korean_MD_FFF5:
case MAPPER_SMS_Korean_MD_FFFA:
case MAPPER_SMS_Korean_MSX_32KB_2000:
case MAPPER_GG_Gear_6_in_1_FFFE_FFF7_FFFF:
default:
fwrite (RAM, 0x2000, 1, f); // Do not use g_driver->ram because of g_driver video mode change
break;
Expand Down Expand Up @@ -518,6 +524,7 @@ int Load_Game_MSV(FILE *f)
case MAPPER_SMS_Korean_MD_FFF5:
case MAPPER_SMS_Korean_MD_FFFA:
case MAPPER_SMS_Korean_MSX_32KB_2000:
case MAPPER_GG_Gear_6_in_1_FFFE_FFF7_FFFF:
default:
fread (RAM, 0x2000, 1, f); // Do not use g_driver->ram because of g_driver video mode change
break;
Expand Down