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author Curt Coder <curtcoder@mail.com>2012-09-09 16:26:08 +0000
committer Curt Coder <curtcoder@mail.com>2012-09-09 16:26:08 +0000
commite310628cb632e394396fe93b29bec05f400cd01a (patch)
tree85f88e6aea4d56a6b119ff1930fc880ba673f585 /src
parent2b0c45d0052fb99516f42de01975eacac6040a27 (diff)
(MESS) c128: Added skeleton for the MOS8722 MMU. (nw)
Diffstat (limited to 'src')
-rw-r--r--src/mess/machine/mos8722.c231
-rw-r--r--src/mess/machine/mos8722.h118
-rw-r--r--src/mess/mess.mak1
3 files changed, 350 insertions, 0 deletions
diff --git a/src/mess/machine/mos8722.c b/src/mess/machine/mos8722.c
new file mode 100644
index 00000000000..fa4cc518b4f
--- /dev/null
+++ b/src/mess/machine/mos8722.c
@@ -0,0 +1,231 @@
+/**********************************************************************
+
+ MOS Technology 8722 Memory Management Unit emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+#include "mos8722.h"
+
+
+
+//**************************************************************************
+// MACROS / CONSTANTS
+//**************************************************************************
+
+#define LOG 0
+
+
+// registers
+enum
+{
+ CR = 0,
+ PCRA, LCRA = PCRA,
+ PCRB, LCRB = PCRB,
+ PCRC, LCRC = PCRC,
+ PCRD, LCRD = PCRD,
+ MCR,
+ RCR,
+ P0L,
+ P0H,
+ P1L,
+ P1H,
+ VR
+};
+
+
+// configuration register
+enum
+{
+ CR_IO_SYSTEM_IO = 0,
+ CR_IO_HI_ROM
+};
+
+enum
+{
+ CR_ROM_SYSTEM_ROM = 0,
+ CR_ROM_INT_FUNC_ROM,
+ CR_ROM_EXT_FUNC_ROM,
+ CR_ROM_RAM
+};
+
+#define CR_IO BIT(m_reg[CR], 0)
+#define CR_ROM_LO BIT(m_reg[CR], 1)
+#define CR_ROM_MID ((m_reg[CR] >> 2) & 0x03)
+#define CR_ROM_HI ((m_reg[CR] >> 4) & 0x03)
+#define CR_A16 BIT(m_reg[CR], 6)
+
+
+// mode configuration register
+#define MCR_8500 BIT(m_reg[MCR], 0)
+#define MCR_FSDIR BIT(m_reg[MCR], 3)
+#define MCR_GAME BIT(m_reg[MCR], 4)
+#define MCR_EXROM BIT(m_reg[MCR], 5)
+#define MCR_C64 BIT(m_reg[MCR], 6)
+#define MCR_40_80 BIT(m_reg[MCR], 7)
+
+
+// RAM configuration register
+enum
+{
+ RCR_STATUS_NO = 0,
+ RCR_STATUS_BOTTOM,
+ RCR_STATUS_TOP,
+ RCR_STATUS_BOTH
+};
+
+#define RCR_SHARE (m_reg[RCR] & 0x03)
+#define RCR_STATUS ((m_reg[RCR] >> 2) & 0x03)
+#define RCR_A16 BIT(m_reg[RCR], 6)
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type MOS8722 = &device_creator<mos8722_device>;
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// mos8722_device - constructor
+//-------------------------------------------------
+
+mos8722_device::mos8722_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, MOS8722, "MOS8722", tag, owner, clock)
+{
+}
+
+
+//-------------------------------------------------
+// device_config_complete - perform any
+// operations now that the configuration is
+// complete
+//-------------------------------------------------
+
+void mos8722_device::device_config_complete()
+{
+ // inherit a copy of the static data
+ const mos8722_interface *intf = reinterpret_cast<const mos8722_interface *>(static_config());
+ if (intf != NULL)
+ *static_cast<mos8722_interface *>(this) = *intf;
+
+ // or initialize to defaults if none provided
+ else
+ {
+ memset(&m_out_z80en_cb, 0, sizeof(m_out_z80en_cb));
+ memset(&m_out_fsdir_cb, 0, sizeof(m_out_fsdir_cb));
+ memset(&m_in_game_cb, 0, sizeof(m_in_game_cb));
+ memset(&m_in_exrom_cb, 0, sizeof(m_in_exrom_cb));
+ memset(&m_in_sense40_cb, 0, sizeof(m_in_sense40_cb));
+ }
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void mos8722_device::device_start()
+{
+ // resolve callbacks
+ m_out_z80en_func.resolve(m_out_z80en_cb, *this);
+ m_out_fsdir_func.resolve(m_out_fsdir_cb, *this);
+ m_in_game_func.resolve(m_in_game_cb, *this);
+ m_in_exrom_func.resolve(m_in_exrom_cb, *this);
+ m_in_sense40_func.resolve(m_in_sense40_cb, *this);
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void mos8722_device::device_reset()
+{
+}
+
+
+//-------------------------------------------------
+// read - register read
+//-------------------------------------------------
+
+READ8_MEMBER( mos8722_device::read )
+{
+ return 0;
+}
+
+
+//-------------------------------------------------
+// write - register write
+//-------------------------------------------------
+
+WRITE8_MEMBER( mos8722_device::write )
+{
+}
+
+
+//-------------------------------------------------
+// fsdir_r - fast serial direction read
+//-------------------------------------------------
+
+READ_LINE_MEMBER( mos8722_device::fsdir_r )
+{
+ return 1;
+}
+
+
+//-------------------------------------------------
+// ms0_r - memory status 0 read
+//-------------------------------------------------
+
+READ_LINE_MEMBER( mos8722_device::ms0_r )
+{
+ return 1;
+}
+
+
+//-------------------------------------------------
+// ms1_r - memory status 1 read
+//-------------------------------------------------
+
+READ_LINE_MEMBER( mos8722_device::ms1_r )
+{
+ return 1;
+}
+
+
+//-------------------------------------------------
+// ms2_r - memory status 2 read
+//-------------------------------------------------
+
+READ_LINE_MEMBER( mos8722_device::ms2_r )
+{
+ return 1;
+}
+
+
+//-------------------------------------------------
+// ms3_r - memory status 3 read
+//-------------------------------------------------
+
+READ_LINE_MEMBER( mos8722_device::ms3_r )
+{
+ return 1;
+}
+
+
+//-------------------------------------------------
+// ta_r - translated address read
+//-------------------------------------------------
+
+offs_t mos8722_device::ta_r(offs_t offset, int aec)
+{
+ return offset;
+}
diff --git a/src/mess/machine/mos8722.h b/src/mess/machine/mos8722.h
new file mode 100644
index 00000000000..432359ebb7d
--- /dev/null
+++ b/src/mess/machine/mos8722.h
@@ -0,0 +1,118 @@
+/**********************************************************************
+
+ MOS Technology 8722 Memory Management Unit emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************
+ _____ _____
+ Vdd 1 |* \_/ | 48 SENSE40
+ _RESET 2 | | 47 (MS3) 128/64
+ TA15 3 | | 46 _EXROM
+ TA14 4 | | 45 _GAME
+ TA13 5 | | 44 FSDIR
+ TA12 6 | | 43 _Z80EN
+ TA11 7 | | 42 D7
+ TA10 8 | | 41 D6
+ TA9 9 | | 40 D5
+ TA8 10 | | 39 D4
+ _CAS1 11 | | 38 D3
+ _CAS0 12 | MOS8722 | 37 D2
+ I/O SEL (MS2) 13 | | 36 D1
+ ROMBANK1 (MS1) 14 | | 35 D0
+ ROMBANK0 (MS0) 15 | | 34 Vss
+ AEC 16 | | 33 phi0
+ MUX 17 | | 32 R/_W
+ A0 18 | | 31 A15
+ A1 19 | | 30 A14
+ A2 20 | | 29 A13
+ A3 21 | | 28 A12
+ A4/A5 22 | | 27 A11
+ A6/A7 23 | | 26 A10
+ A8 24 |_____________| 25 A9
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __MOS8722__
+#define __MOS8722__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_MOS8722_ADD(_tag, _config) \
+ MCFG_DEVICE_ADD(_tag, MOS8722, 0) \
+ MCFG_DEVICE_CONFIG(_config)
+
+
+#define MOS8722_INTERFACE(name) \
+ const mos8722_interface (name) =
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> mos8722_interface
+
+struct mos8722_interface
+{
+ devcb_write_line m_out_z80en_cb;
+ devcb_write_line m_out_fsdir_cb;
+ devcb_read_line m_in_game_cb;
+ devcb_read_line m_in_exrom_cb;
+ devcb_read_line m_in_sense40_cb;
+};
+
+
+// ======================> mos8722_device
+
+class mos8722_device : public device_t,
+ public mos8722_interface
+{
+public:
+ // construction/destruction
+ mos8722_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ DECLARE_READ8_MEMBER( read );
+ DECLARE_WRITE8_MEMBER( write );
+
+ DECLARE_READ_LINE_MEMBER( fsdir_r );
+ DECLARE_READ_LINE_MEMBER( ms0_r );
+ DECLARE_READ_LINE_MEMBER( ms1_r );
+ DECLARE_READ_LINE_MEMBER( ms2_r );
+ DECLARE_READ_LINE_MEMBER( ms3_r );
+
+ offs_t ta_r(offs_t offset, int aec);
+
+protected:
+ // device-level overrides
+ virtual void device_config_complete();
+ virtual void device_start();
+ virtual void device_reset();
+
+private:
+ devcb_resolved_write_line m_out_z80en_func;
+ devcb_resolved_write_line m_out_fsdir_func;
+ devcb_resolved_read_line m_in_game_func;
+ devcb_resolved_read_line m_in_exrom_func;
+ devcb_resolved_read_line m_in_sense40_func;
+
+ UINT8 m_reg[10];
+};
+
+
+// device type definition
+extern const device_type MOS8722;
+
+
+
+#endif
diff --git a/src/mess/mess.mak b/src/mess/mess.mak
index 65e04bb3c30..d27eec4b45a 100644
--- a/src/mess/mess.mak
+++ b/src/mess/mess.mak
@@ -913,6 +913,7 @@ $(MESSOBJ)/cbm.a: \
$(MESS_MACHINE)/cbmipt.o \
$(MESS_MACHINE)/64h156.o \
$(MESS_MACHINE)/petcass.o \
+ $(MESS_MACHINE)/mos8722.o \
$(MESS_MACHINE)/c2n.o \
$(MESS_VIDEO)/vdc8563.o \
$(MESS_VIDEO)/vic6567.o \