// license:BSD-3-Clause // copyright-holders:AJR /*************************************************************************** Atari 810 Disk Drive The 810 is the original 5ΒΌ" floppy disk interface for the Atari 400/800 computer, supporting only a 709-sector single density format. The built-in drive mechanism uses a four-phase stepper motor which is controlled by outputs to a PIA port rather than by the WD1771-01 FDC. The PIA also generates a synthetic index pulse for the FDC. (The format defines the undersized 19th sector of each track as the index area.) ***************************************************************************/ #include "emu.h" #include "atari810.h" #include "cpu/m6502/m6507.h" // device type definition DEFINE_DEVICE_TYPE(ATARI810, atari810_device, "atari810", "Atari 810 Disk Drive") atari810_device::atari810_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, ATARI810, tag, owner, clock) , device_a8sio_card_interface(mconfig, *this) , m_pia(*this, "pia") , m_fdc(*this, "fdc") { } void atari810_device::device_start() { } void atari810_device::step_w(u8 data) { m_a8sio->data_in_w(BIT(data, 0)); } void atari810_device::mem_map(address_map &map) { map(0x0000, 0x0003).mirror(0x167c).rw(m_fdc, FUNC(fd1771_device::read), FUNC(fd1771_device::write)); map(0x0080, 0x00ff).mirror(0x1400).ram(); // MCM6810 map(0x0100, 0x017f).mirror(0x1480).m(m_pia, FUNC(mos6532_new_device::ram_map)); map(0x0300, 0x031f).mirror(0x14e0).m(m_pia, FUNC(mos6532_new_device::io_map)); map(0x0800, 0x0fff).mirror(0x1000).rom().region("rom", 0); } WRITE_LINE_MEMBER(atari810_device::data_out_w) { m_pia->pb7_w(state); } WRITE_LINE_MEMBER(atari810_device::command_w) { m_pia->pb6_w(state); } WRITE_LINE_MEMBER(atari810_device::ready_w) { m_pia->pb1_w(state); } static INPUT_PORTS_START(atari810) PORT_START("SELECT") // values not verified PORT_DIPNAME(0x05, 0x00, "Drive Code") PORT_DIPLOCATION("S101:1,2") PORT_DIPSETTING(0x00, "No. 1") PORT_DIPSETTING(0x01, "No. 2") PORT_DIPSETTING(0x04, "No. 3") PORT_DIPSETTING(0x05, "No. 4") PORT_BIT(0xfa, IP_ACTIVE_LOW, IPT_UNUSED) INPUT_PORTS_END ioport_constructor atari810_device::device_input_ports() const { return INPUT_PORTS_NAME(atari810); } void atari810_device::device_add_mconfig(machine_config &config) { m6507_device &fdcpu(M6507(config, "fdcpu", 1_MHz_XTAL / 2)); fdcpu.set_addrmap(AS_PROGRAM, &atari810_device::mem_map); MOS6532_NEW(config, m_pia, 1_MHz_XTAL / 2); m_pia->pa_rd_callback().set_ioport("SELECT"); m_pia->pb_wr_callback().set(FUNC(atari810_device::step_w)); //m_pia->irq_wr_callback().set(m_fdc, FUNC(fd1771_device::ip_w)); FD1771(config, m_fdc, 1_MHz_XTAL); m_fdc->drq_wr_callback().set(m_pia, FUNC(mos6532_new_device::pa7_w)); m_fdc->intrq_wr_callback().set(m_pia, FUNC(mos6532_new_device::pa6_w)); } ROM_START(atari810) ROM_REGION(0x0800, "rom", 0) ROM_SYSTEM_BIOS(0, "c", "Rev. C (9:1 skew)") ROMX_LOAD("8229_c68168_c011299c-03.bin", 0x0000, 0x0800, CRC(0896f03d) SHA1(b676b2a46ac3903a6729b92650c5faf0111ba8b6), ROM_BIOS(0)) ROM_SYSTEM_BIOS(1, "b", "Rev. B (12:1 skew)") ROMX_LOAD("810rom_b.bin", 0x0000, 0x0800, CRC(19227d33) SHA1(075b1948a5736599d5501f0125c745b1b9fcced4), ROM_BIOS(1)) ROM_END const tiny_rom_entry *atari810_device::device_rom_region() const { return ROM_NAME(atari810); }