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Diffstat (limited to 'src/mess/machine/abc1600mac.c')
-rw-r--r-- | src/mess/machine/abc1600mac.c | 686 |
1 files changed, 0 insertions, 686 deletions
diff --git a/src/mess/machine/abc1600mac.c b/src/mess/machine/abc1600mac.c deleted file mode 100644 index b22f55708c6..00000000000 --- a/src/mess/machine/abc1600mac.c +++ /dev/null @@ -1,686 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Curt Coder -/********************************************************************** - - Luxor ABC 1600 Memory Access Controller emulation - -**********************************************************************/ - -/* - - TODO: - - - segment/page RAM addresses are not correctly decoded, "sas/format/format" can't find the SASI interface because of this - forcetask0 1 t0 0 t1 0 t2 0 t3 0 - sega19 0 task 0 - sega 000 segd 00 pga 008 pgd 4058 virtual 02c730 (should be 004730) -*/ - -#include "abc1600mac.h" - - - -//************************************************************************** -// MACROS / CONSTANTS -//************************************************************************** - -#define LOG 0 - - -#define A0 BIT(offset, 0) -#define A1 BIT(offset, 1) -#define A2 BIT(offset, 2) -#define A4 BIT(offset, 4) -#define A7 BIT(offset, 7) -#define A8 BIT(offset, 8) -#define X11 BIT(offset, 11) -#define X12 BIT(offset, 12) -#define A17 BIT(offset, 17) -#define A18 BIT(offset, 18) -#define A19 BIT(offset, 19) - -#define A10_A9_A8 ((offset >> 8) & 0x07) -#define A2_A1_A0 (offset & 0x07) -#define A1_A2 ((A1 << 1) | A2) -#define A2_A1 ((offset >> 1) & 0x03) - -#define FC0 BIT(fc, 0) -#define FC1 BIT(fc, 1) -#define FC2 BIT(fc, 2) - -#define PAGE_WP BIT(page_data, 14) -#define PAGE_NONX BIT(page_data, 15) - -#define BOOTE BIT(m_task, 6) -#define MAGIC BIT(m_task, 7) -#define READ_MAGIC !MAGIC - - - -//************************************************************************** -// DEVICE DEFINITIONS -//************************************************************************** - -const device_type ABC1600_MAC = &device_creator<abc1600_mac_device>; - - -DEVICE_ADDRESS_MAP_START( map, 8, abc1600_mac_device ) - AM_RANGE(0x00000, 0xfffff) AM_READWRITE(read, write) -ADDRESS_MAP_END - - -static ADDRESS_MAP_START( program_map, AS_PROGRAM, 8, abc1600_mac_device ) -ADDRESS_MAP_END - - -//------------------------------------------------- -// ROM( abc1600_mac ) -//------------------------------------------------- - -ROM_START( abc1600_mac ) - ROM_REGION( 0x4000, "boot", 0 ) - ROM_LOAD( "boot 6490356-04.1f", 0x0000, 0x4000, CRC(9372f6f2) SHA1(86f0681f7ef8dd190b49eda5e781881582e0c2a4) ) - - ROM_REGION( 0x104, "plds", 0 ) - ROM_LOAD( "1022 6490351-01.17e", 0x000, 0x104, CRC(5dd00d43) SHA1(a3871f0d796bea9df8f25d41b3169dd4b8ef65ab) ) // MAC register address decoder -ROM_END - - -//------------------------------------------------- -// rom_region - device-specific ROM region -//------------------------------------------------- - -const rom_entry *abc1600_mac_device::device_rom_region() const -{ - return ROM_NAME( abc1600_mac ); -} - - - -//************************************************************************** -// LIVE DEVICE -//************************************************************************** - -//------------------------------------------------- -// abc1600_mac_device - constructor -//------------------------------------------------- - -abc1600_mac_device::abc1600_mac_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) - : device_t(mconfig, ABC1600_MAC, "ABC 1600 MAC", tag, owner, clock, "abc1600mac", __FILE__), - device_memory_interface(mconfig, *this), - m_space_config("program", ENDIANNESS_LITTLE, 8, 22, 0, *ADDRESS_MAP_NAME(program_map)), - m_rom(*this, "boot"), - m_segment_ram(*this, "segment_ram"), - m_page_ram(*this, "page_ram"), - m_task(0) -{ -} - - -//------------------------------------------------- -// device_start - device-specific startup -//------------------------------------------------- - -void abc1600_mac_device::device_start() -{ - // get the CPU device - m_cpu = machine().device<m68000_base_device>(m_cpu_tag); - assert(m_cpu != NULL); - - // allocate memory - m_segment_ram.allocate(0x400); - m_page_ram.allocate(0x400); - - // HACK fill segment RAM or abcenix won't boot - memset(m_segment_ram, 0xcd, 0x400); - - // state saving - save_item(NAME(m_ifc2)); - save_item(NAME(m_task)); - save_item(NAME(m_dmamap)); - save_item(NAME(m_cause)); -} - - -//------------------------------------------------- -// device_reset - device-specific reset -//------------------------------------------------- - -void abc1600_mac_device::device_reset() -{ - // clear task register - m_task = 0; -} - - -//------------------------------------------------- -// memory_space_config - return a description of -// any address spaces owned by this device -//------------------------------------------------- - -const address_space_config *abc1600_mac_device::memory_space_config(address_spacenum spacenum) const -{ - return (spacenum == AS_PROGRAM) ? &m_space_config : NULL; -} - - -//------------------------------------------------- -// get_current_task - -//------------------------------------------------- - -int abc1600_mac_device::get_current_task(offs_t offset) -{ - int force_task0 = !(m_ifc2 || A19); - int t0 = !(BIT(m_task, 0) || force_task0); - int t1 = !(BIT(m_task, 1) || force_task0); - int t2 = !(BIT(m_task, 2) || force_task0); - int t3 = !(BIT(m_task, 3) || force_task0); - - return (t3 << 3) | (t2 << 2) | (t1 << 1) | t0; -} - - -//------------------------------------------------- -// get_segment_address - -//------------------------------------------------- - -offs_t abc1600_mac_device::get_segment_address(offs_t offset) -{ - int sega19 = !(!(A8 || m_ifc2) || !A19); - int task = get_current_task(offset); - - return (task << 5) | (sega19 << 4) | ((offset >> 15) & 0x0f); -} - - -//------------------------------------------------- -// get_page_address - -//------------------------------------------------- - -offs_t abc1600_mac_device::get_page_address(offs_t offset, UINT8 segd) -{ - return ((segd & 0x3f) << 4) | ((offset >> 11) & 0x0f); -} - - -//------------------------------------------------- -// translate_address - -//------------------------------------------------- - -offs_t abc1600_mac_device::translate_address(offs_t offset, int *nonx, int *wp) -{ - // segment - offs_t sega = get_segment_address(offset); - UINT8 segd = m_segment_ram[sega]; - - // page - offs_t pga = get_page_address(offset, segd); - UINT16 page_data = m_page_ram[pga]; - - offs_t virtual_offset = ((page_data & 0x3ff) << 11) | (offset & 0x7ff); - - if (PAGE_NONX) - { - //logerror("Bus error %06x : %06x\n", offset, virtual_offset); - //m_cpu->set_input_line(M68K_LINE_BUSERROR, ASSERT_LINE); - //m_cpu->set_input_line(M68K_LINE_BUSERROR, CLEAR_LINE); - } - - *nonx = PAGE_NONX; - *wp = PAGE_WP; - - return virtual_offset; -} - - -//------------------------------------------------- -// read_user_memory - -//------------------------------------------------- - -UINT8 abc1600_mac_device::read_user_memory(offs_t offset) -{ - int nonx = 0, wp = 0; - offs_t virtual_offset = translate_address(offset, &nonx, &wp); - - return space().read_byte(virtual_offset); -} - - -//------------------------------------------------- -// write_user_memory - -//------------------------------------------------- - -void abc1600_mac_device::write_user_memory(offs_t offset, UINT8 data) -{ - int nonx = 0, wp = 0; - offs_t virtual_offset = translate_address(offset, &nonx, &wp); - - //if (nonx || !wp) return; - - space().write_byte(virtual_offset, data); -} - - -//------------------------------------------------- -// read_supervisor_memory - -//------------------------------------------------- - -UINT8 abc1600_mac_device::read_supervisor_memory(address_space &space, offs_t offset) -{ - UINT8 data = 0; - - if (!A2 && !A1) - { - // _EP - data = page_r(space, offset); - } - else if (!A2 && A1 && A0) - { - // _ES - data = segment_r(space, offset); - } - else if (A2 && A1 && A0) - { - // _CAUSE - data = cause_r(space, offset); - } - - return data; -} - - -//------------------------------------------------- -// write_supervisor_memory - -//------------------------------------------------- - -void abc1600_mac_device::write_supervisor_memory(address_space &space, offs_t offset, UINT8 data) -{ - if (!A2 && !A1) - { - // _WEP - page_w(space, offset, data); - } - else if (!A2 && A1 && A0) - { - // _WES - segment_w(space, offset, data); - } - else if (A2 && !A1 && A0) - { - // W(C) - task_w(space, offset, data); - } -} - - -//------------------------------------------------- -// get_fc - -//------------------------------------------------- - -int abc1600_mac_device::get_fc() -{ - UINT16 fc = m_cpu->get_fc(); - - m_ifc2 = !(!(MAGIC || FC0) || FC2); - - return fc; -} - - -//------------------------------------------------- -// read - -//------------------------------------------------- - -READ8_MEMBER( abc1600_mac_device::read ) -{ - int fc = get_fc(); - - UINT8 data = 0; - - if (!BOOTE && !A19 && !A18 && !A17) - { - // _BOOTCE - data = m_rom->base()[offset & 0x3fff]; - } - else if (A19 && !m_ifc2 && !FC1) - { - data = read_supervisor_memory(space, offset); - } - else - { - data = read_user_memory(offset); - } - - return data; -} - - -//------------------------------------------------- -// write - -//------------------------------------------------- - -WRITE8_MEMBER( abc1600_mac_device::write ) -{ - int fc = get_fc(); - - if (A19 && !m_ifc2 && !FC1) - { - write_supervisor_memory(space, offset, data); - } - else - { - write_user_memory(offset, data); - } -} - - -//------------------------------------------------- -// cause_r - -//------------------------------------------------- - -READ8_MEMBER( abc1600_mac_device::cause_r ) -{ - /* - - bit description - - 0 RSTBUT - 1 1 - 2 DMAOK - 3 X16 - 4 X17 - 5 X18 - 6 X19 - 7 X20 - - */ - - UINT8 data = 0x02; - - // DMA status - data |= m_cause; - - machine().watchdog_reset(); - - return data; -} - - -//------------------------------------------------- -// task_w - -//------------------------------------------------- - -WRITE8_MEMBER( abc1600_mac_device::task_w ) -{ - /* - - bit description - - 0 TASKD0* (inverted SEGA5) - 1 TASKD1* (inverted SEGA6) - 2 TASKD2* (inverted SEGA7) - 3 TASKD3* (inverted SEGA8) - 4 - 5 - 6 BOOTE* - 7 MAGIC* - - */ - - m_task = data ^ 0xff; - - if (LOG) logerror("%s: %06x Task %u BOOTE %u MAGIC %u\n", machine().describe_context(), offset, get_current_task(offset), BOOTE, MAGIC); -} - - -//------------------------------------------------- -// segment_r - -//------------------------------------------------- - -READ8_MEMBER( abc1600_mac_device::segment_r ) -{ - /* - - bit description - - 0 SEGD0 - 1 SEGD1 - 2 SEGD2 - 3 SEGD3 - 4 SEGD4 - 5 SEGD5 - 6 SEGD6 - 7 READ_MAGIC - - */ - - offs_t sega = get_segment_address(offset); - UINT8 segd = m_segment_ram[sega]; - - return (READ_MAGIC << 7) | (segd & 0x7f); -} - - -//------------------------------------------------- -// segment_w - -//------------------------------------------------- - -WRITE8_MEMBER( abc1600_mac_device::segment_w ) -{ - /* - - bit description - - 0 SEGD0 - 1 SEGD1 - 2 SEGD2 - 3 SEGD3 - 4 SEGD4 - 5 SEGD5 - 6 SEGD6 - 7 0 - - */ - - offs_t sega = get_segment_address(offset); - - m_segment_ram[sega] = data & 0x7f; - - if (LOG) logerror("%s: %06x Task %u Segment %03x : %02x\n", machine().describe_context(), offset, get_current_task(offset), sega, data); -} - - -//------------------------------------------------- -// page_r - -//------------------------------------------------- - -READ8_MEMBER( abc1600_mac_device::page_r ) -{ - /* - - bit description - - 0 X11 - 1 X12 - 2 X13 - 3 X14 - 4 X15 - 5 X16 - 6 X17 - 7 X18 - - 8 X19 - 9 X20 - 10 X20 - 11 X20 - 12 X20 - 13 X20 - 14 _WP - 15 NONX - - */ - - // segment - offs_t sega = get_segment_address(offset); - UINT8 segd = m_segment_ram[sega]; - - // page - offs_t pga = get_page_address(offset, segd); - UINT16 pgd = m_page_ram[pga]; - - UINT8 data = 0; - - if (A0) - { - data = pgd & 0xff; - } - else - { - int x20 = BIT(pgd, 9); - - data = (pgd >> 8) | (x20 << 2) | (x20 << 3) | (x20 << 4) | (x20 << 5); - } - - return data; -} - - -//------------------------------------------------- -// page_w - -//------------------------------------------------- - -WRITE8_MEMBER( abc1600_mac_device::page_w ) -{ - /* - - bit description - - 0 X11 - 1 X12 - 2 X13 - 3 X14 - 4 X15 - 5 X16 - 6 X17 - 7 X18 - - 8 X19 - 9 X20 - 10 - 11 - 12 - 13 - 14 _WP - 15 NONX - - */ - - // segment - offs_t sega = get_segment_address(offset); - UINT8 segd = m_segment_ram[sega]; - - // page - offs_t pga = get_page_address(offset, segd); - - if (A0) - { - m_page_ram[pga] = (m_page_ram[pga] & 0xff00) | data; - } - else - { - m_page_ram[pga] = ((data & 0xc3) << 8) | (m_page_ram[pga] & 0xff); - } - - if (LOG) logerror("%s: %06x Task %u Segment %03x Page %03x : %02x -> %04x\n", machine().describe_context(), offset, get_current_task(offset), sega, pga, data, m_page_ram[pga]); -} - - -//------------------------------------------------- -// get_dma_address - -//------------------------------------------------- - -offs_t abc1600_mac_device::get_dma_address(int index, UINT16 offset) -{ - // A0 = DMA15, A1 = BA1, A2 = BA2 - UINT8 dmamap_addr = index | BIT(offset, 15); - UINT8 dmamap = m_dmamap[dmamap_addr]; - - m_cause = (dmamap & 0x1f) << 3; - - return ((dmamap & 0x1f) << 16) | offset; -} - - -//------------------------------------------------- -// dma_mreq_r - DMA memory read -//------------------------------------------------- - -UINT8 abc1600_mac_device::dma_mreq_r(int index, UINT16 offset) -{ - offs_t virtual_offset = get_dma_address(index, offset); - - return space().read_byte(virtual_offset); -} - - -//------------------------------------------------- -// dma_mreq_w - DMA memory write -//------------------------------------------------- - -void abc1600_mac_device::dma_mreq_w(int index, UINT16 offset, UINT8 data) -{ - offs_t virtual_offset = get_dma_address(index, offset); - - space().write_byte(virtual_offset, data); -} - - -//------------------------------------------------- -// dma_iorq_r - DMA I/O read -//------------------------------------------------- - -UINT8 abc1600_mac_device::dma_iorq_r(int index, UINT16 offset) -{ - offs_t virtual_offset = 0x1fe000 | get_dma_address(index, offset); - - return space().read_byte(virtual_offset); -} - - -//------------------------------------------------- -// dma_iorq_w - DMA I/O write -//------------------------------------------------- - -void abc1600_mac_device::dma_iorq_w(int index, UINT16 offset, UINT8 data) -{ - offs_t virtual_offset = 0x1fe000 | get_dma_address(index, offset); - - space().write_byte(virtual_offset, data); -} - - -//------------------------------------------------- -// dmamap_w - DMA map write -//------------------------------------------------- - -WRITE8_MEMBER( abc1600_mac_device::dmamap_w ) -{ - /* - - bit description - - 0 X16 - 1 X17 - 2 X18 - 3 X19 - 4 X20 - 5 - 6 - 7 _R/W - - */ - - if (LOG) logerror("DMAMAP %u %02x\n", offset & 7, data); - - m_dmamap[offset & 7] = data; -} |