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Diffstat (limited to 'src/mame/machine/pc80s31k.cpp')
-rw-r--r-- | src/mame/machine/pc80s31k.cpp | 460 |
1 files changed, 460 insertions, 0 deletions
diff --git a/src/mame/machine/pc80s31k.cpp b/src/mame/machine/pc80s31k.cpp new file mode 100644 index 00000000000..317a9edd988 --- /dev/null +++ b/src/mame/machine/pc80s31k.cpp @@ -0,0 +1,460 @@ +// license:BSD-3-Clause +// copyright-holders:Angelo Salese, Olivier Galibert +/************************************************************************************************** + + NEC PC-80S31(K) Mini Disk Unit + + Z80 + μPD765 + PPI that connects in cross with an host PPI + + "Mini" as compared to the PC-8881 8-inch floppy I/F + + Design is decidedly derived from Epson TF-20 and friends, + cfr. devices/bus/epson_sio/tf20.cpp + + TODO: + - What's PC-80S32? Is it the 88VA version or a different beast? + - PC=0x7dd reads from FDC bit 3 in ST3 (twosid_r fn), + expecting a bit 3 high for all the PC8001 games otherwise keeps looping and eventually dies. + Are those incorrectly identified as 2DD? Hacked to work for now; + - set_input_line_vector fn doesn't work properly when issued from a device_reset, + we currently just implement the irq_callback instead; + - Bus option; + - Cascade mode, i.e. the CN2 connector used to accept a second disk unit for drive 2 & 3; + - pc80s31k: verify that irq vector write (I/O port $f0) belongs here or just + whatever PC88VA uses. + - printer interface (used for debugging? 4-bit serial?) + - Pinpoint what host I/O ports $f6, $f7 truly are + (direct FDC access from this device or a different beast? cfr. play6lim with pc8001mk2) + - filemst tries to access undocumented I/O port $09 at PC=5000: + \- If that's 0 then it tries to read a vector at [0x8000]; + \- It then tries to read at memory [0xc0ff], set the value read in [0xf012]; + \- Expects that ROM [0x0000] is not equal to 0xc3; + Bottom line: Is it trying to access some custom HW? + +=================================================================================================== + +PCB (PC-80S31K) + +=================================================================================================== + + |--------------------------------------| + | P1 P2 P3 X1 | + | | + | CN2 | + | B6102C022 | + | FD1 FD2 (**) | + | | | | + | CN1 ------- D765AC D2364EC (*)| + | (*)| + | D8255AC-2 B6101C017 D780C-1 | + | | + |--------------------------------------| + + PCB is marked PC-80S31KFDC NEC-14T + P1, P2, P3 are power supplies (+5V, +12V, -5V for P1, lacks -5V for the other two) + μPD2364EC is at position IC13, it's a 8192 size ROM. (***) + (*) are μPD41416C + (**) marked as JP, unpopulated x 3; + μPB6101/2 are bipolar TTL gate arrays, presumably + Cannot read marking of X1 (8 MHz?) + + (***) Given this, we guess that PC80S31 is the 2D version while the 'K + variant is the 2D/2DD/2HD version. + +=================================================================================================== + +Command Protocol + +=================================================================================================== + +Command & parameters are normally communicated from Host via port B +(read on port A on FDC side) +An RPi implementation can be seen at https://github.com/MinatsuT/RPi_PC-80S31 + +[0x00] Initialize +[0x01] Write to disk + %1 number of sectors + %2 drive number + %3 track number + %4 sector number +1 +[0x02] Read from disk + %1 number of sectors + %2 drive number + %3 track number + %4 sector number +1 +[0x03] Send data to host +[0x04] Copy data in-place + %1 number of sectors + %2 source drive + %3 source track + %4 source sector number +1 + %5 destination drive + %6 destination track + %7 destination sector number +1 +[0x05] Format + %1 drive number +[0x06] Send result status to Host + x--- ---- I/O complete + -x-- ---- has unread buffer + ---- ---x error occurred +[0x07] Drive status +[0x0b] Send memory data +%1-%2 address start +%3-%4 length +[0x11] Fast write to disk + %1 number of sectors + %2 drive number + %3 track number + %4 sector number +1 +[0x12] Fast send data + (picks up number of sector etc. from previous issued commands?) +[0x14] Device status + x--- ---- ESIG: error + -x-- ---- WPDR: write protected + --x- ---- RDY: ready + ---x ---- TRK0: track 0 + ---- x--- DSDR: double sided drive + ---- -x-- HDDR: head + ---- --xx DS1, DS2: drive select + (same as 765 ST3?) +[0x17] Mode change + %1 ---- xxxx mode select + +FDC normally puts ST0-1-2 to RAM buffers $7f0d-f, CHRN data in $7f10-13 + +=================================================================================================== + +Port C +Used as a communication protocol flags + +=================================================================================================== + + Host side + (swap 4-bit nibbles and r/w direction for FDC side, all bits are active high): + x--- ---- (w) ATN AtenTioN: + host sends a command to FDC, interrupts current one + (looks unconnected the other way around?) + -x-- ---- (w) DAC DAta aCcepted: + host just picked up data from FDC + --x- ---- (w) RFD Ready For Data: + host requests data from FDC + ---x ---- (w) DAV DAta Valid: + host outputs data to port B + ---- -x-- (r) DAC DAta aCcepted: + FDC has accepted data from port B + ---- --x- (r) RFD Ready For Data: + FDC requests data from host + ---- ---x (r) DAV DAta Valid: + FDC has output data to port A + +**************************************************************************************************/ + +#include "emu.h" +#include "pc80s31k.h" + +//#define VERBOSE 1 +#include "logmacro.h" + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + + +// device type definition +DEFINE_DEVICE_TYPE(PC80S31, pc80s31_device, "pc80s31", "NEC PC-80S31 Mini Disk Unit I/F") +DEFINE_DEVICE_TYPE(PC80S31K, pc80s31k_device, "pc80s31k", "NEC PC-80S31K Mini Disk Unit I/F") + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + + +//------------------------------------------------- +// pc80s31_device - constructor +//------------------------------------------------- + + +pc80s31_device::pc80s31_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, type, tag, owner, clock) + , m_fdc(*this, "fdc") + , m_floppy(*this, "fdc:%u", 0U) + , m_fdc_cpu(*this, "fdc_cpu") + , m_fdc_rom(*this, "fdc_rom") + , m_ppi_host(*this, "ppi_host") + , m_ppi_fdc(*this, "ppi_fdc") + , m_latch(*this, "latch_%u", 0U) +{ +} + + +pc80s31_device::pc80s31_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : pc80s31_device(mconfig, PC80S31, tag, owner, clock) +{ + +} + +ROM_START( pc80s31 ) + // TODO: exact identification of these + ROM_REGION( 0x2000, "fdc_rom", ROMREGION_ERASEFF ) + ROM_SYSTEM_BIOS( 0, "disk", "disk BIOS" ) + ROMX_LOAD( "disk.rom", 0x0000, 0x0800, CRC(2158d307) SHA1(bb7103a0818850a039c67ff666a31ce49a8d516f), ROM_BIOS(0) ) + ROM_SYSTEM_BIOS( 1, "mk2fr", "mkIIFR disk BIOS" ) + ROMX_LOAD( "mk2fr_disk.rom", 0x0000, 0x0800, CRC(2163b304) SHA1(80da2dee49d4307f00895a129a5cfeff00cf5321), ROM_BIOS(1) ) + + ROM_FILL( 0x7df, 1, 0x00 ) + ROM_FILL( 0x7e0, 1, 0x00 ) +ROM_END + +const tiny_rom_entry *pc80s31_device::device_rom_region() const +{ + return ROM_NAME( pc80s31 ); +} + +//------------------------------------------------- +// device_add_mconfig - device-specific machine +// configuration addiitons +//------------------------------------------------- + +void pc80s31_device::host_map(address_map &map) +{ + map(0, 3).rw(m_ppi_host, FUNC(i8255_device::read), FUNC(i8255_device::write)); +} + +void pc80s31_device::fdc_map(address_map &map) +{ + map(0x0000, 0x1fff).rom().region("fdc_rom", 0); + map(0x4000, 0x7fff).ram(); +} + +void pc80s31_device::fdc_io(address_map &map) +{ + map.unmap_value_high(); + map.global_mask(0xff); +// map(0x09, 0x09).r accessed by filemst (pc8801), cfr. notes + +// map(0xf0, 0xf0).w(FUNC(pc8801_state::fdc_irq_vector_w)); // Interrupt Opcode Port +// map(0xf4, 0xf4).w(FUNC(pc8801_state::fdc_drive_mode_w)); // Drive mode, 2d, 2dd, 2hd +// map(0xf6, 0xf6).nopw(); // printer related + map(0xf7, 0xf7).nopw(); // printer port output + map(0xf8, 0xf8).rw(FUNC(pc80s31_device::terminal_count_r), FUNC(pc80s31_device::motor_control_w)); + map(0xfa, 0xfb).m(m_fdc, FUNC(upd765a_device::map)); + map(0xfc, 0xff).rw(m_ppi_fdc, FUNC(i8255_device::read), FUNC(i8255_device::write)); +} + +static void pc88_floppies(device_slot_interface &device) +{ + // TODO: definitely not correct for base device + device.option_add("525hd", FLOPPY_525_HD); +} + +IRQ_CALLBACK_MEMBER(pc80s31_device::irq_cb) +{ + return m_irq_vector; +} + +void pc80s31_device::device_add_mconfig(machine_config &config) +{ + constexpr XTAL fdc_xtal = XTAL(4'000'000); + Z80(config, m_fdc_cpu, fdc_xtal); + m_fdc_cpu->set_addrmap(AS_PROGRAM, &pc80s31_device::fdc_map); + m_fdc_cpu->set_addrmap(AS_IO, &pc80s31_device::fdc_io); + m_fdc_cpu->set_irq_acknowledge_callback(FUNC(pc80s31_device::irq_cb)); + + UPD765A(config, m_fdc, XTAL(4'000'000), true, true); + m_fdc->intrq_wr_callback().set_inputline(m_fdc_cpu, INPUT_LINE_IRQ0); + + for (auto &floppy : m_floppy) + { + FLOPPY_CONNECTOR(config, floppy, pc88_floppies, "525hd", floppy_image_device::default_mfm_floppy_formats); + floppy->enable_sound(true); + } + + for (auto &latch : m_latch) + GENERIC_LATCH_8(config, latch); + + I8255A(config, m_ppi_host); + m_ppi_host->in_pa_callback().set(FUNC(pc80s31_device::latch_r<0>)); + m_ppi_host->out_pa_callback().set(FUNC(pc80s31_device::latch_w<1>)); + m_ppi_host->in_pb_callback().set(FUNC(pc80s31_device::latch_r<2>)); + m_ppi_host->out_pb_callback().set(FUNC(pc80s31_device::latch_w<3>)); + m_ppi_host->in_pc_callback().set(FUNC(pc80s31_device::latch_r<4>)); + m_ppi_host->out_pc_callback().set(FUNC(pc80s31_device::latch_w<5>)); + + // 8255AC-2 + I8255A(config, m_ppi_fdc); + m_ppi_fdc->in_pa_callback().set(FUNC(pc80s31_device::latch_r<3>)); + m_ppi_fdc->out_pa_callback().set(FUNC(pc80s31_device::latch_w<2>)); + m_ppi_fdc->in_pb_callback().set(FUNC(pc80s31_device::latch_r<1>)); + m_ppi_fdc->out_pb_callback().set(FUNC(pc80s31_device::latch_w<0>)); + m_ppi_fdc->in_pc_callback().set(FUNC(pc80s31_device::latch_r<5>)); + m_ppi_fdc->out_pc_callback().set(FUNC(pc80s31_device::latch_w<4>)); +} + +//------------------------------------------------- +// device_timer - device-specific timers +//------------------------------------------------- + +void pc80s31_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) +{ + assert(id == 0); + + m_fdc->tc_w(false); + + // several games tries to scan invalid IDs from their structures, if this hits then + // it's possibly an attempt to scan a missing sector from the floppy structure. + // cfr. acrojet: the third read data command issued tries to access a CHRN of (0, 0, 16, 256) + // and checks at PC=500B if any of these status flags are satisfied: + // ST0 & 0xdf + // ST1 & 0xff + // ST2 & 0x73 + // Data doesn't matter, it also seems to have some activity to the printer port + // (debugging left on?) + if ((u8)m_fdc_cpu->state_int(Z80_HALT) == 1) + { + logerror("%s: attempt to trigger TC while in HALT state (read ID copy protection warning)\n", machine().describe_context()); +// throw emu_fatalerror("copy protection hit"); + } +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void pc80s31_device::device_start() +{ + m_tc_zero_timer = timer_alloc(0); + + save_item(NAME(m_irq_vector)); +} + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + + +void pc80s31_device::device_reset() +{ + m_floppy[0]->get_device()->set_rpm(300); + m_floppy[1]->get_device()->set_rpm(300); + m_fdc->set_rate(250000); + + // TODO: doesn't seem to work for devices? + m_fdc_cpu->set_input_line_vector(0, 0); + m_irq_vector = 0; + + m_tc_zero_timer->adjust(attotime::never); +} + + +//************************************************************************** +// READ/WRITE HANDLERS +//************************************************************************** + +// Comms are simple dual port connected in cross fashion. +// Even at "perfect" interleave tho we need to mailbox the connections. +// - barbatus will hang at Artec logo the first time around (works if you soft reset); +template <unsigned N> u8 pc80s31_device::latch_r() +{ + const int port_mask = N & 4 ? 0x0f : 0xff; +// machine().scheduler().synchronize(); + return m_latch[N]->read() & port_mask; +} + +template <unsigned N> void pc80s31_device::latch_w(u8 data) +{ + const int lower_nibble = N & 4; +// machine().scheduler().synchronize(); + if (lower_nibble) + { + LOG("%s: %s port C write %02x (ATN=%d DAC=%d RFD=%d DAV=%d)\n" + , N & 1 ? "host" : "fdc" + , machine().describe_context() + , data + , BIT(data, 7) + , BIT(data, 6) + , BIT(data, 5) + , BIT(data, 4) + ); + } + return m_latch[N]->write(data >> lower_nibble); +} + +u8 pc80s31_device::terminal_count_r(address_space &space) +{ + if (!machine().side_effects_disabled()) + { + m_fdc->tc_w(true); + // TODO: accurate time of this going off + m_tc_zero_timer->reset(); + m_tc_zero_timer->adjust(attotime::from_usec(50)); + } + // value is meaningless (never readback) + // TODO: verify this being 0xff or open bus + return space.unmap(); +} + +void pc80s31_device::motor_control_w(uint8_t data) +{ + // FIXME: on pc80s31k device (particularly on later releases) this stays always on + // babylon: just spins indefinitely at PC=6d8 (using the internal routines), + // waiting for DAV or ATN being on. Never hits the port until a flag is issued. + // prajator: on idle times it spins at PC=7060, waiting for ATN and keep issuing a 0xff here. + // valis2: calls PC=7009 subroutine for idle, waits for ATN on. + // It eventually writes a 0 here, not before an extremely long time + // (~10000 frames!) + m_floppy[0]->get_device()->mon_w(!(data & 1)); + m_floppy[1]->get_device()->mon_w(!(data & 2)); + + // TODO: according to docs a value of 0x07 enables precompensation to tracks 0-19, 0xf enables it on 20-39 +} + +//************************************************************************** +// +// PC80S31K device overrides +// +//************************************************************************** + +pc80s31k_device::pc80s31k_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : pc80s31_device(mconfig, PC80S31K, tag, owner, clock) +{ + +} + +ROM_START( pc80s31k ) + // TODO: exact identification of these + ROM_REGION( 0x2000, "fdc_rom", ROMREGION_ERASEFF ) + ROM_SYSTEM_BIOS( 0, "ma", "MA disk BIOS") + ROMX_LOAD( "ma_disk.rom", 0x0000, 0x2000, CRC(a222ecf0) SHA1(79e9c0786a14142f7a83690bf41fb4f60c5c1004), ROM_BIOS(0) ) + ROM_SYSTEM_BIOS( 1, "mk2mr", "mkIIMR disk BIOS" ) + ROMX_LOAD( "m2mr_disk.rom", 0x0000, 0x2000, CRC(2447516b) SHA1(1492116f15c426f9796dc2bb6fcccf2656c0ca75), ROM_BIOS(1) ) + ROM_SYSTEM_BIOS( 2, "mh", "MH disk BIOS" ) + ROMX_LOAD( "mh_disk.rom", 0x0000, 0x2000, CRC(a222ecf0) SHA1(79e9c0786a14142f7a83690bf41fb4f60c5c1004), ROM_BIOS(2) ) + // TODO: this may belong to PC-80S32 + ROM_SYSTEM_BIOS( 3, "88va", "PC88VA disk BIOS") + ROMX_LOAD( "vasubsys.rom", 0x0000, 0x2000, CRC(08962850) SHA1(a9375aa480f85e1422a0e1385acb0ea170c5c2e0), ROM_BIOS(3) ) +ROM_END + +const tiny_rom_entry *pc80s31k_device::device_rom_region() const +{ + return ROM_NAME( pc80s31k ); +} + +void pc80s31k_device::drive_mode_w(uint8_t data) +{ + // TODO: fix implementation + // anything that isn't a 2D doesn't really set proper parameters in here + logerror("FDC drive mode %02x\n", data); + m_floppy[0]->get_device()->set_rpm(BIT(data, 0) ? 360 : 300); + m_floppy[1]->get_device()->set_rpm(BIT(data, 1) ? 360 : 300); + + m_fdc->set_rate(BIT(data, 5) ? 500000 : 250000); +} + +void pc80s31k_device::fdc_io(address_map &map) +{ + pc80s31_device::fdc_io(map); + + map(0xf0, 0xf0).lw8(NAME([this] (u8 data) { m_irq_vector = data; })); + map(0xf4, 0xf4).w(FUNC(pc80s31k_device::drive_mode_w)); +} |