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(MESS) c128: Added skeleton for the MOS8722 MMU. (nw)
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Curt Coder
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@ -6854,6 +6854,8 @@ src/mess/machine/mm58274c.c svneol=native#text/plain
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src/mess/machine/mm58274c.h svneol=native#text/plain
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src/mess/machine/mos6530.c svneol=native#text/plain
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src/mess/machine/mos6530.h svneol=native#text/plain
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src/mess/machine/mos8722.c svneol=native#text/plain
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src/mess/machine/mos8722.h svneol=native#text/plain
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src/mess/machine/mpc105.c svneol=native#text/plain
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src/mess/machine/mpc105.h svneol=native#text/plain
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src/mess/machine/msx.c svneol=native#text/plain
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231
src/mess/machine/mos8722.c
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231
src/mess/machine/mos8722.c
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/**********************************************************************
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MOS Technology 8722 Memory Management Unit emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************/
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#include "mos8722.h"
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//**************************************************************************
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// MACROS / CONSTANTS
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//**************************************************************************
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#define LOG 0
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// registers
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enum
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{
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CR = 0,
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PCRA, LCRA = PCRA,
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PCRB, LCRB = PCRB,
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PCRC, LCRC = PCRC,
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PCRD, LCRD = PCRD,
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MCR,
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RCR,
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P0L,
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P0H,
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P1L,
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P1H,
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VR
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};
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// configuration register
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enum
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{
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CR_IO_SYSTEM_IO = 0,
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CR_IO_HI_ROM
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};
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enum
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{
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CR_ROM_SYSTEM_ROM = 0,
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CR_ROM_INT_FUNC_ROM,
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CR_ROM_EXT_FUNC_ROM,
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CR_ROM_RAM
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};
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#define CR_IO BIT(m_reg[CR], 0)
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#define CR_ROM_LO BIT(m_reg[CR], 1)
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#define CR_ROM_MID ((m_reg[CR] >> 2) & 0x03)
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#define CR_ROM_HI ((m_reg[CR] >> 4) & 0x03)
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#define CR_A16 BIT(m_reg[CR], 6)
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// mode configuration register
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#define MCR_8500 BIT(m_reg[MCR], 0)
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#define MCR_FSDIR BIT(m_reg[MCR], 3)
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#define MCR_GAME BIT(m_reg[MCR], 4)
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#define MCR_EXROM BIT(m_reg[MCR], 5)
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#define MCR_C64 BIT(m_reg[MCR], 6)
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#define MCR_40_80 BIT(m_reg[MCR], 7)
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// RAM configuration register
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enum
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{
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RCR_STATUS_NO = 0,
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RCR_STATUS_BOTTOM,
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RCR_STATUS_TOP,
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RCR_STATUS_BOTH
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};
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#define RCR_SHARE (m_reg[RCR] & 0x03)
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#define RCR_STATUS ((m_reg[RCR] >> 2) & 0x03)
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#define RCR_A16 BIT(m_reg[RCR], 6)
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type MOS8722 = &device_creator<mos8722_device>;
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// mos8722_device - constructor
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//-------------------------------------------------
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mos8722_device::mos8722_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: device_t(mconfig, MOS8722, "MOS8722", tag, owner, clock)
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{
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}
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//-------------------------------------------------
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// device_config_complete - perform any
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// operations now that the configuration is
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// complete
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//-------------------------------------------------
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void mos8722_device::device_config_complete()
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{
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// inherit a copy of the static data
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const mos8722_interface *intf = reinterpret_cast<const mos8722_interface *>(static_config());
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if (intf != NULL)
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*static_cast<mos8722_interface *>(this) = *intf;
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// or initialize to defaults if none provided
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else
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{
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memset(&m_out_z80en_cb, 0, sizeof(m_out_z80en_cb));
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memset(&m_out_fsdir_cb, 0, sizeof(m_out_fsdir_cb));
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memset(&m_in_game_cb, 0, sizeof(m_in_game_cb));
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memset(&m_in_exrom_cb, 0, sizeof(m_in_exrom_cb));
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memset(&m_in_sense40_cb, 0, sizeof(m_in_sense40_cb));
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}
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void mos8722_device::device_start()
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{
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// resolve callbacks
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m_out_z80en_func.resolve(m_out_z80en_cb, *this);
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m_out_fsdir_func.resolve(m_out_fsdir_cb, *this);
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m_in_game_func.resolve(m_in_game_cb, *this);
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m_in_exrom_func.resolve(m_in_exrom_cb, *this);
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m_in_sense40_func.resolve(m_in_sense40_cb, *this);
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void mos8722_device::device_reset()
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{
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}
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//-------------------------------------------------
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// read - register read
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//-------------------------------------------------
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READ8_MEMBER( mos8722_device::read )
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{
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return 0;
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}
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//-------------------------------------------------
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// write - register write
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//-------------------------------------------------
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WRITE8_MEMBER( mos8722_device::write )
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{
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}
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//-------------------------------------------------
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// fsdir_r - fast serial direction read
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//-------------------------------------------------
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READ_LINE_MEMBER( mos8722_device::fsdir_r )
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{
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return 1;
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}
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//-------------------------------------------------
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// ms0_r - memory status 0 read
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//-------------------------------------------------
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READ_LINE_MEMBER( mos8722_device::ms0_r )
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{
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return 1;
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}
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//-------------------------------------------------
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// ms1_r - memory status 1 read
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//-------------------------------------------------
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READ_LINE_MEMBER( mos8722_device::ms1_r )
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{
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return 1;
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}
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//-------------------------------------------------
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// ms2_r - memory status 2 read
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//-------------------------------------------------
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READ_LINE_MEMBER( mos8722_device::ms2_r )
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{
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return 1;
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}
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//-------------------------------------------------
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// ms3_r - memory status 3 read
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//-------------------------------------------------
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READ_LINE_MEMBER( mos8722_device::ms3_r )
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{
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return 1;
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}
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//-------------------------------------------------
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// ta_r - translated address read
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//-------------------------------------------------
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offs_t mos8722_device::ta_r(offs_t offset, int aec)
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{
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return offset;
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}
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118
src/mess/machine/mos8722.h
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118
src/mess/machine/mos8722.h
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@ -0,0 +1,118 @@
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/**********************************************************************
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MOS Technology 8722 Memory Management Unit emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************
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_____ _____
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Vdd 1 |* \_/ | 48 SENSE40
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_RESET 2 | | 47 (MS3) 128/64
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TA15 3 | | 46 _EXROM
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TA14 4 | | 45 _GAME
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TA13 5 | | 44 FSDIR
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TA12 6 | | 43 _Z80EN
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TA11 7 | | 42 D7
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TA10 8 | | 41 D6
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TA9 9 | | 40 D5
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TA8 10 | | 39 D4
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_CAS1 11 | | 38 D3
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_CAS0 12 | MOS8722 | 37 D2
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I/O SEL (MS2) 13 | | 36 D1
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ROMBANK1 (MS1) 14 | | 35 D0
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ROMBANK0 (MS0) 15 | | 34 Vss
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AEC 16 | | 33 phi0
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MUX 17 | | 32 R/_W
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A0 18 | | 31 A15
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A1 19 | | 30 A14
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A2 20 | | 29 A13
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A3 21 | | 28 A12
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A4/A5 22 | | 27 A11
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A6/A7 23 | | 26 A10
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A8 24 |_____________| 25 A9
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**********************************************************************/
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#pragma once
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#ifndef __MOS8722__
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#define __MOS8722__
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#include "emu.h"
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//**************************************************************************
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// INTERFACE CONFIGURATION MACROS
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//**************************************************************************
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#define MCFG_MOS8722_ADD(_tag, _config) \
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MCFG_DEVICE_ADD(_tag, MOS8722, 0) \
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MCFG_DEVICE_CONFIG(_config)
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#define MOS8722_INTERFACE(name) \
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const mos8722_interface (name) =
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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// ======================> mos8722_interface
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struct mos8722_interface
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{
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devcb_write_line m_out_z80en_cb;
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devcb_write_line m_out_fsdir_cb;
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devcb_read_line m_in_game_cb;
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devcb_read_line m_in_exrom_cb;
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devcb_read_line m_in_sense40_cb;
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};
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// ======================> mos8722_device
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class mos8722_device : public device_t,
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public mos8722_interface
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{
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public:
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// construction/destruction
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mos8722_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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DECLARE_READ8_MEMBER( read );
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DECLARE_WRITE8_MEMBER( write );
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DECLARE_READ_LINE_MEMBER( fsdir_r );
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DECLARE_READ_LINE_MEMBER( ms0_r );
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DECLARE_READ_LINE_MEMBER( ms1_r );
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DECLARE_READ_LINE_MEMBER( ms2_r );
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DECLARE_READ_LINE_MEMBER( ms3_r );
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offs_t ta_r(offs_t offset, int aec);
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protected:
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// device-level overrides
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virtual void device_config_complete();
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virtual void device_start();
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virtual void device_reset();
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private:
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devcb_resolved_write_line m_out_z80en_func;
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devcb_resolved_write_line m_out_fsdir_func;
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devcb_resolved_read_line m_in_game_func;
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devcb_resolved_read_line m_in_exrom_func;
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devcb_resolved_read_line m_in_sense40_func;
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UINT8 m_reg[10];
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};
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// device type definition
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extern const device_type MOS8722;
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#endif
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@ -913,6 +913,7 @@ $(MESSOBJ)/cbm.a: \
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$(MESS_MACHINE)/cbmipt.o \
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$(MESS_MACHINE)/64h156.o \
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$(MESS_MACHINE)/petcass.o \
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$(MESS_MACHINE)/mos8722.o \
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$(MESS_MACHINE)/c2n.o \
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$(MESS_VIDEO)/vdc8563.o \
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$(MESS_VIDEO)/vic6567.o \
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