MACHINE_RESET_MEMBER(astrocde_mess_state, astrocde)
{
int ram_expansion_installed = 0, write_protect_on = 0, expansion_ram_start = 0, expansion_ram_end = 0, shadow_ram_end = 0;
address_space &space = m_maincpu->space(AS_PROGRAM);
UINT8 *expram = machine().device<ram_device>("ram_tag")->pointer();
space.unmap_readwrite(0x5000, 0xffff); // unmap any previously installed expansion RAM
get_ram_expansion_settings(ram_expansion_installed, write_protect_on, expansion_ram_start, expansion_ram_end, shadow_ram_end); // passing by reference
if (ram_expansion_installed == 1)
{
if (write_protect_on == 0) // write protect off, so install memory normally
{
space.install_ram(expansion_ram_start, expansion_ram_end, expram);
if (shadow_ram_end > expansion_ram_end)
space.install_ram(expansion_ram_end + 1, shadow_ram_end, expram);
}
else // write protect on, so make memory read only
{
space.nop_write(expansion_ram_start, expansion_ram_end);
}
}
}
ADDRESS_MAP_END
INPUT_CHANGED_MEMBER(astrocde_mess_state::set_write_protect) // run when RAM expansion write protect switch is changed
{
int ram_expansion_installed = 0, write_protect_on = 0, expansion_ram_start = 0, expansion_ram_end = 0, shadow_ram_end = 0;
address_space &space = m_maincpu->space(AS_PROGRAM);
UINT8 *expram = machine().device<ram_device>("ram_tag")->pointer();
get_ram_expansion_settings(ram_expansion_installed, write_protect_on, expansion_ram_start, expansion_ram_end, shadow_ram_end); // passing by reference
if (ram_expansion_installed == 1)
{
if (write_protect_on == 0) // write protect off, so install memory normally
{
space.install_ram(expansion_ram_start, expansion_ram_end, expram);
if (shadow_ram_end > expansion_ram_end)
space.install_ram(expansion_ram_end + 1, shadow_ram_end, expram);
}
else // write protect on, so make memory read only
{
space.nop_write(expansion_ram_start, expansion_ram_end);
}
}
}
ADDRESS_MAP_END
static INPUT_CHANGED( set_write_protect ) // run when RAM expansion write protect switch is changed
{
int ram_expansion_installed = 0, write_protect_on = 0, expansion_ram_start = 0, expansion_ram_end = 0, shadow_ram_end = 0;
address_space *space = field.machine().device("maincpu")->memory().space(AS_PROGRAM);
UINT8 *expram = ram_get_ptr(field.machine().device("ram_tag"));
get_ram_expansion_settings(space, ram_expansion_installed, write_protect_on, expansion_ram_start, expansion_ram_end, shadow_ram_end); // passing by reference
if (ram_expansion_installed == 1)
{
if (write_protect_on == 0) // write protect off, so install memory normally
{
space->install_ram(expansion_ram_start, expansion_ram_end, expram);
if (shadow_ram_end > expansion_ram_end)
space->install_ram(expansion_ram_end + 1, shadow_ram_end, expram);
}
else // write protect on, so make memory read only
{
space->nop_write(expansion_ram_start, expansion_ram_end);
}
}
}
