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atm: Remove direct update handler. Still not working, but less badly [O. Galibert]

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This commit is contained in:
Olivier Galibert 2017-03-03 08:14:18 +01:00
parent 6ab16bfc90
commit a970b50ed1
1 changed files with 39 additions and 49 deletions
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88
src/mame/drivers/atm.cpp
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@ -6,9 +6,6 @@ MicroART ATM (clone of Spectrum)
Not working because of banking issues.
The direct_update_handler needs rewriting, because removing it allows the
computer to boot up (with keyboard problems).
*******************************************************************************************/
#include "emu.h"
@ -33,7 +30,9 @@ public:
{ }
DECLARE_WRITE8_MEMBER(atm_port_7ffd_w);
DIRECT_UPDATE_MEMBER(atm_direct);
DECLARE_READ8_MEMBER(beta_neutral_r);
DECLARE_READ8_MEMBER(beta_enable_r);
DECLARE_READ8_MEMBER(beta_disable_r);
DECLARE_MACHINE_RESET(atm);
protected:
@ -44,48 +43,11 @@ protected:
required_device<beta_disk_device> m_beta;
private:
address_space *m_program;
uint8_t *m_p_ram;
void atm_update_memory();
};
DIRECT_UPDATE_MEMBER(atm_state::atm_direct)
{
uint16_t pc = m_maincpu->state_int(STATE_GENPCBASE);
if (m_beta->started() && m_beta->is_active())
{
if (pc >= 0x4000)
{
m_ROMSelection = BIT(m_port_7ffd_data, 4);
m_beta->disable();
m_bank1->set_base(&m_p_ram[0x10000 + (m_ROMSelection<<14)]);
}
}
else if (((pc & 0xff00) == 0x3d00) && (m_ROMSelection==1))
{
m_ROMSelection = 3;
if (m_beta->started())
m_beta->enable();
}
if(address<=0x3fff)
{
if (m_ROMSelection == 3)
{
direct.explicit_configure(0x0000, 0x3fff, 0x3fff, &m_p_ram[0x18000]);
m_bank1->set_base(&m_p_ram[0x18000]);
}
else
{
direct.explicit_configure(0x0000, 0x3fff, 0x3fff, &m_p_ram[0x10000 + (m_ROMSelection<<14)]);
m_bank1->set_base(&m_p_ram[0x10000 + (m_ROMSelection<<14)]);
}
return ~0;
}
return address;
}
void atm_state::atm_update_memory()
{
uint8_t *messram = m_ram->pointer();
@ -117,6 +79,33 @@ WRITE8_MEMBER(atm_state::atm_port_7ffd_w)
atm_update_memory();
}
READ8_MEMBER(atm_state::beta_neutral_r)
{
return m_program->read_byte(offset);
}
READ8_MEMBER(atm_state::beta_enable_r)
{
if(m_ROMSelection == 1) {
m_ROMSelection = 3;
if (m_beta->started()) {
m_beta->enable();
m_bank1->set_base(&m_p_ram[0x18000]);
}
}
return m_program->read_byte(offset + 0x3d00);
}
READ8_MEMBER(atm_state::beta_disable_r)
{
if (m_beta->started() && m_beta->is_active()) {
m_ROMSelection = BIT(m_port_7ffd_data, 4);
m_beta->disable();
m_bank1->set_base(&m_p_ram[0x10000 + (m_ROMSelection<<14)]);
}
return m_program->read_byte(offset + 0x4000);
}
static ADDRESS_MAP_START (atm_io, AS_IO, 8, atm_state )
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x001f, 0x001f) AM_DEVREADWRITE(BETA_DISK_TAG, beta_disk_device, status_r, command_w) AM_MIRROR(0xff00)
@ -130,20 +119,20 @@ static ADDRESS_MAP_START (atm_io, AS_IO, 8, atm_state )
AM_RANGE(0xc000, 0xc000) AM_DEVREADWRITE("ay8912", ay8910_device, data_r, address_w) AM_MIRROR(0x3ffd)
ADDRESS_MAP_END
static ADDRESS_MAP_START (atm_switch, AS_DECRYPTED_OPCODES, 8, atm_state)
AM_RANGE(0x3d00, 0x3dff) AM_READ(beta_enable_r)
AM_RANGE(0x0000, 0x3fff) AM_READ(beta_neutral_r) // Overlap with previous because we want real addresses on the 3e00-3fff range
AM_RANGE(0x4000, 0xffff) AM_READ(beta_disable_r)
ADDRESS_MAP_END
MACHINE_RESET_MEMBER(atm_state,atm)
{
uint8_t *messram = m_ram->pointer();
address_space &space = m_maincpu->space(AS_PROGRAM);
m_program = &m_maincpu->space(AS_PROGRAM);
m_p_ram = memregion("maincpu")->base();
space.install_read_bank(0x0000, 0x3fff, "bank1");
space.unmap_write(0x0000, 0x3fff);
if (m_beta->started())
{
m_beta->enable();
}
space.set_direct_update_handler(direct_update_delegate(&atm_state::atm_direct, this));
memset(messram,0,128*1024);
@ -185,6 +174,7 @@ GFXDECODE_END
static MACHINE_CONFIG_DERIVED_CLASS( atm, spectrum_128, atm_state )
MCFG_CPU_MODIFY("maincpu")
MCFG_CPU_IO_MAP(atm_io)
MCFG_CPU_DECRYPTED_OPCODES_MAP(atm_switch)
MCFG_MACHINE_RESET_OVERRIDE(atm_state, atm )
MCFG_BETA_DISK_ADD(BETA_DISK_TAG)