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https://github.com/holub/mame
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hitachi/b16.cpp: identify some irq sources
This commit is contained in:
angelosa
parent
64f10c9e5d
commit
b81e508ed6
@ -20,6 +20,7 @@ DMAC uPD8257C-5 @ 18B
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INTM / INTS 2x uPD8259AC @ 13D / 15D
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Labelless CRTC, Fujitsu 6845 package
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FDC is unpopulated on board, should be a 765 coupled with a SED9420C/AC
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USART is unpopulated on board, assume i8251
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BDC HN65013G025 @ 2A
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CAL HN6223S @ 12K - Near bus slots
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CA HN6022B @ 12L /
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@ -40,6 +41,30 @@ Centronics port CN9, Serial port CN8
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===================================================================================================
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irq vectors
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intm
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ir0 pit timer (does work RAM logic only)
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ir1 FDC irq
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ir2 ?
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ir3 vblank?
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ir4 ?
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ir5 ?
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ir6 slave ack
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ir7 ?
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ints
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ir0 keyboard
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ir1 ?
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ir2 ?
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ir3 device at I/O $38 / $3a
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ir4 device at I/O $4c / $4e
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ir5 ?
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ir6 ?
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ir7 ?
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===================================================================================================
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Error codes (TODO: RE them all)
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0301 PIT failure
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1101 b16ex2 bus config error?
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@ -49,7 +74,8 @@ Error codes (TODO: RE them all)
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#include "emu.h"
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#include "cpu/i86/i86.h"
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#include "cpu/i86/i286.h"
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#include "machine/am9517a.h"
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#include "imagedev/floppy.h"
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#include "machine/i8257.h"
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#include "machine/pic8259.h"
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#include "machine/pit8253.h"
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#include "machine/upd765.h"
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@ -57,7 +83,7 @@ Error codes (TODO: RE them all)
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#include "emupal.h"
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#include "screen.h"
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#include "softlist_dev.h"
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namespace {
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@ -71,12 +97,13 @@ public:
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, m_intm(*this, "intm")
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, m_ints(*this, "ints")
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, m_dma(*this, "dma")
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, m_fdc(*this, "fdc")
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, m_crtc(*this, "crtc")
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, m_vram(*this, "vram")
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, m_gfxdecode(*this, "gfxdecode")
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, m_palette(*this, "palette")
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, m_kanji_rom(*this, "kanji")
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, m_fdc(*this, "fdc")
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, m_floppy(*this, "fdc:%u", 0U)
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{ }
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void b16(machine_config &config);
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@ -84,6 +111,7 @@ public:
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protected:
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virtual void video_start() override;
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virtual void machine_reset() override;
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void b16_map(address_map &map);
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void b16_io(address_map &map);
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@ -96,13 +124,14 @@ private:
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required_device<pit8253_device> m_pit;
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required_device<pic8259_device> m_intm;
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required_device<pic8259_device> m_ints;
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required_device<am9517a_device> m_dma;
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required_device<upd765a_device> m_fdc;
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required_device<i8257_device> m_dma;
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required_device<mc6845_device> m_crtc;
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required_shared_ptr<uint16_t> m_vram;
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required_device<gfxdecode_device> m_gfxdecode;
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required_device<palette_device> m_palette;
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required_region_ptr<uint8_t> m_kanji_rom;
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required_device<upd765a_device> m_fdc;
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required_device_array<floppy_connector, 2> m_floppy;
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std::unique_ptr<u8[]> m_ig_ram;
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@ -114,6 +143,8 @@ private:
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void memory_write_byte(offs_t offset, uint8_t data);
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uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
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static void floppy_formats(format_registration &fr);
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};
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#define mc6845_h_char_total (m_crtc_vreg[0])
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@ -242,12 +273,13 @@ void b16_state::crtc_data_w(uint8_t data)
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void b16_state::b16_io(address_map &map)
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{
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map.unmap_value_high();
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// map(0x00, 0x07).umask16(0x00ff); // DMA device? PIT mirror?
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// map(0x00, 0x07).umask16(0x00ff); // PIT mirror?
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map(0x08, 0x0f).rw(m_pit, FUNC(pit8253_device::read), FUNC(pit8253_device::write)).umask16(0x00ff);
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map(0x10, 0x13).rw(m_intm, FUNC(pic8259_device::read), FUNC(pic8259_device::write)).umask16(0x00ff);
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map(0x18, 0x1b).rw(m_ints, FUNC(pic8259_device::read), FUNC(pic8259_device::write)).umask16(0x00ff);
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map(0x20, 0x20).w(FUNC(b16_state::crtc_address_w));
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map(0x22, 0x22).w(FUNC(b16_state::crtc_data_w));
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// map(0x28, 0x2b) keyboard, likely thru USART
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// Jumper block?
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// map(0x40, 0x40)
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// map(0x42, 0x42)
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@ -255,6 +287,7 @@ void b16_state::b16_io(address_map &map)
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// b16ex2: jumps to $e0000 if bit 7 high, noisy on bit 4
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map(0x48, 0x48).lr8(NAME([] () { return 0; }));
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map(0x70, 0x73).m(m_fdc, FUNC(upd765a_device::map)).umask16(0x00ff);
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// map(0x74, 0x74).rw(m_fdc, FUNC(upd765a_device::dma_r), FUNC(upd765a_device::dma_w));
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map(0x78, 0x78).lrw8(
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NAME([this] () {
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return m_port78;
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@ -264,6 +297,15 @@ void b16_state::b16_io(address_map &map)
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// bit 0: motor on?
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// bit 2: FDC reset?
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m_port78 = data;
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{
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floppy_image_device *floppy = m_floppy[0]->get_device();
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if (floppy != nullptr && BIT(data, 0))
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{
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floppy->mon_w(1);
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floppy->mon_w(0);
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}
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}
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})
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);
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map(0x79, 0x79).lrw8(
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@ -275,14 +317,12 @@ void b16_state::b16_io(address_map &map)
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logerror("Port $79 write %02x\n", data);
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})
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);
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map(0x80, 0x81).portr("SYSTEM");
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map(0x80, 0x89).rw(m_dma, FUNC(i8257_device::read), FUNC(i8257_device::write)).umask16(0x00ff);
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// map(0x8020, 0x8023) external FDC? Checked at FDC irq
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}
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static INPUT_PORTS_START( b16 )
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PORT_START("SYSTEM")
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PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_VBLANK("screen")
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PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_VBLANK("screen")
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INPUT_PORTS_END
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@ -328,46 +368,68 @@ void b16_state::memory_write_byte(offs_t offset, uint8_t data)
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return prog_space.write_byte(offset, data);
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}
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static void b16_floppies(device_slot_interface &device)
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{
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device.option_add("525dd", FLOPPY_525_DD);
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// TODO: at least PC-98 3.5" x 1.2MB format
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}
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void b16_state::floppy_formats(format_registration &fr)
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{
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fr.add_pc_formats();
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// fr.add(FLOPPY_NASLITE_FORMAT);
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// fr.add(FLOPPY_IBMXDF_FORMAT);
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}
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void b16_state::machine_reset()
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{
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floppy_image_device *floppy = m_floppy[0]->get_device();
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if (floppy != nullptr)
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floppy->set_rpm(300);
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m_fdc->set_rate(250000);
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}
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void b16_state::b16(machine_config &config)
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{
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// TODO: attached ROM may be B16 EX instead, with 8086-2 (8 MHz)
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// Original B16 should be I8088
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I8086(config, m_maincpu, XTAL(14'318'181)/2);
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I8086(config, m_maincpu, XTAL(16'000'000)/2);
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m_maincpu->set_addrmap(AS_PROGRAM, &b16_state::b16_map);
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m_maincpu->set_addrmap(AS_IO, &b16_state::b16_io);
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m_maincpu->set_irq_acknowledge_callback(m_intm, FUNC(pic8259_device::inta_cb));
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PIT8253(config, m_pit);
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// TODO: unconfirmed, just enough to make it surpass POST checks
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m_pit->set_clk<0>(XTAL(14'318'181) / 8);
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// m_pit->out_handler<0>()
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m_pit->set_clk<1>(XTAL(14'318'181) / 4);
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m_pit->set_clk<0>(XTAL(16'000'000) / 8);
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m_pit->out_handler<0>().set(m_intm, FUNC(pic8259_device::ir0_w));
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m_pit->set_clk<1>(XTAL(16'000'000) / 4);
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// m_pit->out_handler<1>()
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m_pit->set_clk<2>(XTAL(14'318'181) / 4);
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m_pit->set_clk<2>(XTAL(16'000'000) / 4);
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// m_pit->out_handler<2>()
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// TODO: wrong type
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AM9517A(config, m_dma, XTAL(14'318'181)/2);
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m_dma->in_memr_callback().set(FUNC(b16_state::memory_read_byte));
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m_dma->out_memw_callback().set(FUNC(b16_state::memory_write_byte));
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I8257(config, m_dma, XTAL(16'000'000));
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m_dma->in_memr_cb().set(FUNC(b16_state::memory_read_byte));
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m_dma->out_memw_cb().set(FUNC(b16_state::memory_write_byte));
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PIC8259(config, m_intm);
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m_intm->out_int_callback().set_inputline(m_maincpu, 0);
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m_intm->in_sp_callback().set_constant(1);
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// m_intm->read_slave_ack_callback()
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m_intm->read_slave_ack_callback().set(m_ints, FUNC(pic8259_device::acknowledge));
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PIC8259(config, m_ints, 0);
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// m_ints->out_int_callback().set(m_intm, FUNC(pic8259_device::ir?_w));
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m_ints->out_int_callback().set(m_intm, FUNC(pic8259_device::ir6_w));
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m_ints->in_sp_callback().set_constant(0);
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UPD765A(config, m_fdc, 8'000'000, true, true);
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// m_fdc->intrq_wr_callback().set(FUNC(b16_state::intrq_w));
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// m_fdc->drq_wr_callback().set(FUNC(b16_state::drq_w));
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// FLOPPY_CONNECTOR(config, "fdc:0", ?_floppies, "525?", floppy_image_device::default_mfm_floppy_formats).enable_sound(true);
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// FLOPPY_CONNECTOR(config, "fdc:1", ?_floppies, "525?", floppy_image_device::default_mfm_floppy_formats).enable_sound(true);
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UPD765A(config, m_fdc, 8'000'000, false, false);
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m_fdc->intrq_wr_callback().set(m_intm, FUNC(pic8259_device::ir1_w));
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m_fdc->drq_wr_callback().set([this] (int state) { logerror("drq %d\n", state);});
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FLOPPY_CONNECTOR(config, "fdc:0", b16_floppies, "525dd", b16_state::floppy_formats).enable_sound(true);
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FLOPPY_CONNECTOR(config, "fdc:1", b16_floppies, "525dd", b16_state::floppy_formats).enable_sound(true);
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MC6845(config, m_crtc, XTAL(14'318'181)/5); /* unknown variant, unknown clock, hand tuned to get ~60 fps */
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/* unknown variant, unknown clock, hand tuned to get ~60 fps */
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MC6845(config, m_crtc, XTAL(16'000'000)/6);
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m_crtc->set_screen("screen");
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m_crtc->set_show_border_area(false);
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m_crtc->set_char_width(8);
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@ -383,6 +445,9 @@ void b16_state::b16(machine_config &config)
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GFXDECODE(config, m_gfxdecode, m_palette, gfx_b16);
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// TODO: palette format is a guess
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PALETTE(config, m_palette, palette_device::BRG_3BIT).set_entries(8);
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// Unconfirmed, just to have something to load with
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SOFTWARE_LIST(config, "pc_disk_list").set_compatible("ibm5150");
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}
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void b16_state::b16ex2(machine_config &config)
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@ -391,6 +456,7 @@ void b16_state::b16ex2(machine_config &config)
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I80286(config.replace(), m_maincpu, XTAL(16'000'000) / 2); // A80286-8 / S
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m_maincpu->set_addrmap(AS_PROGRAM, &b16_state::b16ex2_map);
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m_maincpu->set_addrmap(AS_IO, &b16_state::b16_io);
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m_maincpu->set_irq_acknowledge_callback(m_intm, FUNC(pic8259_device::inta_cb));
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// TODO: as above
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m_pit->set_clk<0>(XTAL(16'000'000) / 4);
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