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megatech: fix crash in service mode

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This commit is contained in:
hap 2022-05-01 23:05:14 +02:00
parent ef52036676
commit 2b0277c650
1 changed files with 8 additions and 11 deletions
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19
src/mame/drivers/megatech.cpp
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@ -123,7 +123,6 @@ protected:
virtual void machine_reset() override;
private:
void megatech(machine_config &config);
void cart_select_w(uint8_t data);
@ -145,7 +144,6 @@ private:
uint8_t sms_ioport_dd_r();
void mt_sms_standard_rom_bank_w(address_space &space, offs_t offset, uint8_t data);
image_init_result load_cart(device_image_interface &image, generic_slot_device *slot, int gameno);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER( mt_cart1 ) { return load_cart(image, m_cart1, 0); }
DECLARE_DEVICE_IMAGE_LOAD_MEMBER( mt_cart2 ) { return load_cart(image, m_cart2, 1); }
@ -163,11 +161,11 @@ private:
void megatech_bios_map(address_map &map);
void megatech_bios_portmap(address_map &map);
uint8_t m_mt_cart_select_reg;
uint32_t m_bios_port_ctrl;
int m_current_machine_is_sms; // is the current game SMS based (running on genesis z80, in VDP compatibility mode)
uint32_t m_bios_ctrl_inputs;
int m_mt_bank_addr;
uint8_t m_mt_cart_select_reg = 0;
uint32_t m_bios_port_ctrl = 0;
int m_current_machine_is_sms = 0; // is the current game SMS based (running on genesis z80, in VDP compatibility mode)
uint32_t m_bios_ctrl_inputs = 0;
int m_mt_bank_addr = 0;
int m_cart_is_genesis[8];
@ -298,7 +296,6 @@ static INPUT_PORTS_START( megatech ) /* Genesis Input Ports */
PORT_DIPSETTING( 0xe0, "1:00" )
PORT_DIPSETTING( 0xf0, "0:30" )
PORT_START("BIOS_J1")
PORT_DIPNAME( 0x0001, 0x0001, "5" )
PORT_DIPSETTING( 0x0001, DEF_STR( Off ) )
@ -475,7 +472,7 @@ void mtech_state::cart_select_w(uint8_t data)
but it stores something in (banked?) ram
because it always seems to show the
same instructions ... */
m_mt_cart_select_reg = data;
m_mt_cart_select_reg = data & 0x07;
switch_cart(m_mt_cart_select_reg);
}
@ -524,12 +521,12 @@ void mtech_state::mt_z80_bank_w(uint8_t data)
uint8_t mtech_state::banked_ram_r(offs_t offset)
{
return m_banked_ram[offset + 0x1000 * (m_mt_cart_select_reg & 0x07)];
return m_banked_ram[offset + 0x1000 * m_mt_cart_select_reg];
}
void mtech_state::banked_ram_w(offs_t offset, uint8_t data)
{
m_banked_ram[offset + 0x1000 * (m_mt_cart_select_reg & 0x07)] = data;
m_banked_ram[offset + 0x1000 * m_mt_cart_select_reg] = data;
}