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Diffstat (limited to 'src/mess/machine/abc1600mac.c')
-rw-r--r--src/mess/machine/abc1600mac.c686
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;
-}