inline void ti8x_update_bank(address_space &space, UINT8 bank, UINT8 *base, UINT8 page, bool is_ram)
{
ti85_state *state = space.machine().driver_data<ti85_state>();
static const char *const tag[] = {"bank1", "bank2", "bank3", "bank4"};
state->membank(tag[bank&3])->set_base(base + (0x4000 * page));
if (is_ram)
space.install_write_bank(bank * 0x4000, bank * 0x4000 + 0x3fff, tag[bank&3]);
else
space.nop_write(bank * 0x4000, bank * 0x4000 + 0x3fff);
}
void wmg_state::wmg_def_install_io_space(address_space &space)
{
pia6821_device *pia_0 = space.machine().device<pia6821_device>("pia_0");
pia6821_device *pia_1 = space.machine().device<pia6821_device>("pia_1");
/* this routine dynamically installs the memory mapped above from c000-cfff */
space.install_write_bank (0xc000, 0xc00f, 0, 0, "bank4");
space.install_write_handler (0xc010, 0xc01f, write8_delegate(FUNC(williams_state::defender_video_control_w),this));
space.install_write_handler (0xc400, 0xc400, write8_delegate(FUNC(wmg_state::wmg_rombank_w),this));
space.install_write_handler (0xc401, 0xc401, write8_delegate(FUNC(wmg_state::wmg_sound_reset_w),this));
space.install_readwrite_handler(0xc804, 0xc807, read8_delegate(FUNC(wmg_state::wmg_pia_0_r),this), write8_delegate(FUNC(pia6821_device::write), pia_0));
space.install_readwrite_handler(0xc80c, 0xc80f, read8_delegate(FUNC(pia6821_device::read), pia_1), write8_delegate(FUNC(pia6821_device::write), pia_1));
space.install_write_handler (0xc900, 0xc9ff, write8_delegate(FUNC(wmg_state::wmg_vram_select_w),this));
space.install_write_handler (0xca00, 0xca07, write8_delegate(FUNC(williams_state::williams_blitter_w),this));
space.install_write_handler (0xcbff, 0xcbff, write8_delegate(FUNC(williams_state::williams_watchdog_reset_w),this));
space.install_read_handler (0xcb00, 0xcbff, read8_delegate(FUNC(williams_state::williams_video_counter_r),this));
space.install_readwrite_handler(0xcc00, 0xcfff, read8_delegate(FUNC(wmg_state::wmg_nvram_r), this), write8_delegate(FUNC(wmg_state::wmg_nvram_w),this));
membank("bank4")->set_base(m_generic_paletteram_8);
}