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https://github.com/holub/mame
synced 2025-07-07 02:50:50 +03:00
Changed DMA to use the new AM core, and improved floppy loading. It starts to load a bunch of CP/M-86 bytes but then dies at sector 02
This commit is contained in:
Angelo Salese
parent
bf5b141f9a
commit
00ded61d13
@ -5,9 +5,8 @@
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preliminary driver by Angelo Salese
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TODO:
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- Bogus DMA check, patched out for now
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- video emulation
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- Floppy device and IMD support
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- Floppy device
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- keyboard
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- Understand interrupt sources
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- NMI seems valid, dumps a x86 stack to vram?
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@ -47,6 +46,10 @@
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0x61 - 0x67 (Mirror of pit8253?)
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0x68 - 0x6f parallel port
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----------------------------------------------------------------------------
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0xfe3c2: checks if the floppy has a valid string for booting (either "CP/M-86"
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or "MS-DOS"), if not, branches with the successive jne.
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***************************************************************************/
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@ -54,7 +57,7 @@
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#include "cpu/i86/i86.h"
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#include "machine/pic8259.h"
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#include "machine/pit8253.h"
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#include "machine/8237dma.h"
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#include "machine/am9517a.h"
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#include "machine/upd765.h"
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#include "video/upd7220.h"
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#include "imagedev/flopdrv.h"
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@ -74,7 +77,7 @@ public:
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m_i8259_m(*this, "pic8259_master"),
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m_i8259_s(*this, "pic8259_slave"),
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m_fdc(*this, "upd765"),
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m_dma(*this, "8237dma"),
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m_dmac(*this, "i8237"),
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m_video_ram_1(*this, "video_ram_1"),
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m_video_ram_2(*this, "video_ram_2")
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{ }
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@ -86,7 +89,7 @@ public:
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required_device<pic8259_device> m_i8259_m;
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required_device<pic8259_device> m_i8259_s;
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required_device<upd765a_device> m_fdc;
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required_device<i8237_device> m_dma;
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required_device<am9517a_device> m_dmac;
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UINT8 *m_char_rom;
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required_shared_ptr<UINT8> m_video_ram_1;
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@ -129,9 +132,8 @@ public:
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DECLARE_DRIVER_INIT(apc);
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DECLARE_PALETTE_INIT(apc);
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int m_dma_channel;
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UINT8 m_dma_offset[2][4];
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UINT8 m_at_pages[0x10];
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int m_dack;
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UINT8 m_dma_offset[4];
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protected:
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// driver_device overrides
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@ -339,7 +341,7 @@ WRITE8_MEMBER(apc_state::apc_kbd_w)
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WRITE8_MEMBER(apc_state::apc_dma_segments_w)
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{
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m_dma_offset[0][offset & 3] = data & 0x0f;
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m_dma_offset[offset & 3] = data & 0x0f;
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}
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/*
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@ -374,17 +376,17 @@ CH3_EXA == 0X3E ; CH-3 extended address (W)
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READ8_MEMBER(apc_state::apc_dma_r)
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{
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return i8237_r(m_dma, space, BITSWAP8(offset,7,6,5,4,2,1,0,3));
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return machine().device<am9517a_device>("i8237")->read(space, BITSWAP8(offset,7,6,5,4,2,1,0,3), 0xff);
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}
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WRITE8_MEMBER(apc_state::apc_dma_w)
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{
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i8237_w(m_dma, space, BITSWAP8(offset,7,6,5,4,2,1,0,3), data);
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machine().device<am9517a_device>("i8237")->write(space, BITSWAP8(offset,7,6,5,4,2,1,0,3), data, 0xff);
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}
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static ADDRESS_MAP_START( apc_map, AS_PROGRAM, 16, apc_state )
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AM_RANGE(0x00000, 0x1ffff) AM_RAM
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AM_RANGE(0x00000, 0x9ffff) AM_RAM
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// AM_RANGE(0xa0000, 0xaffff) space for an external ROM
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AM_RANGE(0xfe000, 0xfffff) AM_ROM AM_REGION("ipl", 0)
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ADDRESS_MAP_END
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@ -466,13 +468,15 @@ INPUT_PORTS_END
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void apc_state::fdc_drq(bool state)
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{
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printf("%02x DRQ\n",state);
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i8237_dreq0_w(m_dma, state);
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// printf("%02x DRQ\n",state);
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// i8237_dreq0_w(m_dma, state);
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m_dmac->dreq1_w(state);
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}
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void apc_state::fdc_irq(bool state)
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{
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printf("IRQ %d\n",state);
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// printf("IRQ %d\n",state);
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pic8259_ir3_w(machine().device("pic8259_slave"), state);
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}
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@ -620,54 +624,58 @@ static const struct pic8259_interface pic8259_slave_config =
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WRITE_LINE_MEMBER(apc_state::apc_dma_hrq_changed)
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{
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machine().device("maincpu")->execute().set_input_line(INPUT_LINE_HALT, state ? ASSERT_LINE : CLEAR_LINE);
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m_maincpu->set_input_line(INPUT_LINE_HALT, state ? ASSERT_LINE : CLEAR_LINE);
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printf("%02x HLDA\n",state);
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m_dmac->hack_w(state);
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/* Assert HLDA */
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i8237_hlda_w( machine().device("dma8237"), state );
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// printf("%02x HLDA\n",state);
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}
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WRITE_LINE_MEMBER( apc_state::apc_tc_w )
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{
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/* floppy terminal count */
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// m_fdc->tc_w(!state);
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m_fdc->tc_w(state);
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printf("TC %02x\n",state);
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}
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READ8_MEMBER(apc_state::apc_dma_read_byte)
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{
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offs_t page_offset = (((offs_t) m_dma_offset[0][m_dma_channel]) << 16)
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& 0xFF0000;
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address_space &program = m_maincpu->space(AS_PROGRAM);
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offs_t addr = (m_dma_offset[m_dack] << 16) | offset;
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return space.read_byte(page_offset + offset);
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printf("%08x\n",addr);
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return program.read_byte(addr);
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}
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WRITE8_MEMBER(apc_state::apc_dma_write_byte)
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{
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offs_t page_offset = (((offs_t) m_dma_offset[0][m_dma_channel]) << 16)
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& 0xFF0000;
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address_space &program = m_maincpu->space(AS_PROGRAM);
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offs_t addr = (m_dma_offset[m_dack] << 16) | offset;
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space.write_byte(page_offset + offset, data);
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// printf("%08x %02x\n",addr,data);
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program.write_byte(addr, data);
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}
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static void set_dma_channel(running_machine &machine, int channel, int state)
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{
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apc_state *drvstate = machine.driver_data<apc_state>();
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if (!state) drvstate->m_dma_channel = channel;
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if (!state) drvstate->m_dack = channel;
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}
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WRITE_LINE_MEMBER(apc_state::apc_dack0_w){ printf("%02x 0\n",state); set_dma_channel(machine(), 0, state); }
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WRITE_LINE_MEMBER(apc_state::apc_dack1_w){ printf("%02x 1\n",state); set_dma_channel(machine(), 1, state); }
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WRITE_LINE_MEMBER(apc_state::apc_dack2_w){ printf("%02x 2\n",state); set_dma_channel(machine(), 2, state); }
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WRITE_LINE_MEMBER(apc_state::apc_dack3_w){ printf("%02x 3\n",state); set_dma_channel(machine(), 3, state); }
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WRITE_LINE_MEMBER(apc_state::apc_dack0_w){ /*printf("%02x 0\n",state);*/ set_dma_channel(machine(), 0, state); }
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WRITE_LINE_MEMBER(apc_state::apc_dack1_w){ /*printf("%02x 1\n",state);*/ set_dma_channel(machine(), 1, state); }
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WRITE_LINE_MEMBER(apc_state::apc_dack2_w){ /*printf("%02x 2\n",state);*/ set_dma_channel(machine(), 2, state); }
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WRITE_LINE_MEMBER(apc_state::apc_dack3_w){ /*printf("%02x 3\n",state);*/ set_dma_channel(machine(), 3, state); }
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READ8_MEMBER(apc_state::test_r)
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{
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printf("2dd DACK R\n");
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// printf("2dd DACK R\n");
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return 0xff;
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return m_fdc->dma_r();
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}
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WRITE8_MEMBER(apc_state::test_w)
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@ -675,7 +683,7 @@ WRITE8_MEMBER(apc_state::test_w)
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printf("2dd DACK W\n");
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}
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static I8237_INTERFACE( dma8237_config )
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static I8237_INTERFACE( dmac_intf )
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{
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DEVCB_DRIVER_LINE_MEMBER(apc_state, apc_dma_hrq_changed),
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DEVCB_DRIVER_LINE_MEMBER(apc_state, apc_tc_w),
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@ -719,7 +727,7 @@ static MACHINE_CONFIG_START( apc, apc_state )
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MCFG_PIT8253_ADD( "pit8253", pit8253_config )
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MCFG_PIC8259_ADD( "pic8259_master", pic8259_master_config )
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MCFG_PIC8259_ADD( "pic8259_slave", pic8259_slave_config )
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MCFG_I8237_ADD("8237dma", MAIN_CLOCK, dma8237_config)
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MCFG_I8237_ADD("i8237", MAIN_CLOCK, dmac_intf)
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MCFG_UPD765A_ADD("upd765", true, true)
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MCFG_FLOPPY_DRIVE_ADD("upd765:0", apc_floppies, "8", 0, apc_floppy_formats)
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