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r17757 Sunday 9th September, 2012 at 16:26:08 UTC by Curt Coder
(MESS) c128: Added skeleton for the MOS8722 MMU. (nw)
[src/mess]mess.mak
[src/mess/machine]mos8722.c* mos8722.h*

trunk/src/mess/machine/mos8722.c
r0r17757
1/**********************************************************************
2
3    MOS Technology 8722 Memory Management Unit emulation
4
5    Copyright MESS Team.
6    Visit http://mamedev.org for licensing and usage restrictions.
7
8**********************************************************************/
9
10#include "mos8722.h"
11
12
13
14//**************************************************************************
15//  MACROS / CONSTANTS
16//**************************************************************************
17
18#define LOG 0
19
20
21// registers
22enum
23{
24   CR = 0,
25   PCRA, LCRA = PCRA,
26   PCRB, LCRB = PCRB,
27   PCRC, LCRC = PCRC,
28   PCRD, LCRD = PCRD,
29   MCR,
30   RCR,
31   P0L,
32   P0H,
33   P1L,
34   P1H,
35   VR
36};
37
38
39// configuration register
40enum
41{
42   CR_IO_SYSTEM_IO = 0,
43   CR_IO_HI_ROM
44};
45
46enum
47{
48   CR_ROM_SYSTEM_ROM = 0,
49   CR_ROM_INT_FUNC_ROM,
50   CR_ROM_EXT_FUNC_ROM,
51   CR_ROM_RAM
52};
53
54#define CR_IO         BIT(m_reg[CR], 0)
55#define CR_ROM_LO      BIT(m_reg[CR], 1)
56#define CR_ROM_MID      ((m_reg[CR] >> 2) & 0x03)
57#define CR_ROM_HI      ((m_reg[CR] >> 4) & 0x03)
58#define CR_A16         BIT(m_reg[CR], 6)
59
60
61// mode configuration register
62#define MCR_8500      BIT(m_reg[MCR], 0)
63#define MCR_FSDIR      BIT(m_reg[MCR], 3)
64#define MCR_GAME      BIT(m_reg[MCR], 4)
65#define MCR_EXROM      BIT(m_reg[MCR], 5)
66#define MCR_C64         BIT(m_reg[MCR], 6)
67#define MCR_40_80      BIT(m_reg[MCR], 7)
68
69
70// RAM configuration register
71enum
72{
73   RCR_STATUS_NO = 0,
74   RCR_STATUS_BOTTOM,
75   RCR_STATUS_TOP,
76   RCR_STATUS_BOTH
77};
78
79#define RCR_SHARE      (m_reg[RCR] & 0x03)
80#define RCR_STATUS      ((m_reg[RCR] >> 2) & 0x03)
81#define RCR_A16         BIT(m_reg[RCR], 6)
82
83
84
85//**************************************************************************
86//  DEVICE DEFINITIONS
87//**************************************************************************
88
89const device_type MOS8722 = &device_creator<mos8722_device>;
90
91
92//**************************************************************************
93//  LIVE DEVICE
94//**************************************************************************
95
96//-------------------------------------------------
97//  mos8722_device - constructor
98//-------------------------------------------------
99
100mos8722_device::mos8722_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
101    : device_t(mconfig, MOS8722, "MOS8722", tag, owner, clock)
102{
103}
104
105
106//-------------------------------------------------
107//  device_config_complete - perform any
108//  operations now that the configuration is
109//  complete
110//-------------------------------------------------
111
112void mos8722_device::device_config_complete()
113{
114   // inherit a copy of the static data
115   const mos8722_interface *intf = reinterpret_cast<const mos8722_interface *>(static_config());
116   if (intf != NULL)
117      *static_cast<mos8722_interface *>(this) = *intf;
118
119   // or initialize to defaults if none provided
120   else
121   {
122      memset(&m_out_z80en_cb, 0, sizeof(m_out_z80en_cb));
123      memset(&m_out_fsdir_cb, 0, sizeof(m_out_fsdir_cb));
124      memset(&m_in_game_cb, 0, sizeof(m_in_game_cb));
125      memset(&m_in_exrom_cb, 0, sizeof(m_in_exrom_cb));
126      memset(&m_in_sense40_cb, 0, sizeof(m_in_sense40_cb));
127   }
128}
129
130
131//-------------------------------------------------
132//  device_start - device-specific startup
133//-------------------------------------------------
134
135void mos8722_device::device_start()
136{
137   // resolve callbacks
138   m_out_z80en_func.resolve(m_out_z80en_cb, *this);
139   m_out_fsdir_func.resolve(m_out_fsdir_cb, *this);
140   m_in_game_func.resolve(m_in_game_cb, *this);
141   m_in_exrom_func.resolve(m_in_exrom_cb, *this);
142   m_in_sense40_func.resolve(m_in_sense40_cb, *this);
143}
144
145
146//-------------------------------------------------
147//  device_reset - device-specific reset
148//-------------------------------------------------
149
150void mos8722_device::device_reset()
151{
152}
153
154
155//-------------------------------------------------
156//  read - register read
157//-------------------------------------------------
158
159READ8_MEMBER( mos8722_device::read )
160{
161   return 0;
162}
163
164
165//-------------------------------------------------
166//  write - register write
167//-------------------------------------------------
168
169WRITE8_MEMBER( mos8722_device::write )
170{
171}
172
173
174//-------------------------------------------------
175//  fsdir_r - fast serial direction read
176//-------------------------------------------------
177
178READ_LINE_MEMBER( mos8722_device::fsdir_r )
179{
180   return 1;
181}
182
183
184//-------------------------------------------------
185//  ms0_r - memory status 0 read
186//-------------------------------------------------
187
188READ_LINE_MEMBER( mos8722_device::ms0_r )
189{
190   return 1;
191}
192
193
194//-------------------------------------------------
195//  ms1_r - memory status 1 read
196//-------------------------------------------------
197
198READ_LINE_MEMBER( mos8722_device::ms1_r )
199{
200   return 1;
201}
202
203
204//-------------------------------------------------
205//  ms2_r - memory status 2 read
206//-------------------------------------------------
207
208READ_LINE_MEMBER( mos8722_device::ms2_r )
209{
210   return 1;
211}
212
213
214//-------------------------------------------------
215//  ms3_r - memory status 3 read
216//-------------------------------------------------
217
218READ_LINE_MEMBER( mos8722_device::ms3_r )
219{
220   return 1;
221}
222
223
224//-------------------------------------------------
225//  ta_r - translated address read
226//-------------------------------------------------
227
228offs_t mos8722_device::ta_r(offs_t offset, int aec)
229{
230   return offset;
231}
trunk/src/mess/machine/mos8722.h
r0r17757
1/**********************************************************************
2
3    MOS Technology 8722 Memory Management Unit emulation
4
5    Copyright MESS Team.
6    Visit http://mamedev.org for licensing and usage restrictions.
7
8**********************************************************************
9                            _____   _____
10                   Vdd   1 |*    \_/     | 48  SENSE40
11                _RESET   2 |             | 47  (MS3) 128/64
12                  TA15   3 |             | 46  _EXROM
13                  TA14   4 |             | 45  _GAME
14                  TA13   5 |             | 44  FSDIR
15                  TA12   6 |             | 43  _Z80EN
16                  TA11   7 |             | 42  D7
17                  TA10   8 |             | 41  D6
18                   TA9   9 |             | 40  D5
19                   TA8  10 |             | 39  D4
20                 _CAS1  11 |             | 38  D3
21                 _CAS0  12 |   MOS8722   | 37  D2
22         I/O SEL (MS2)  13 |             | 36  D1
23        ROMBANK1 (MS1)  14 |             | 35  D0
24        ROMBANK0 (MS0)  15 |             | 34  Vss
25                   AEC  16 |             | 33  phi0
26                   MUX  17 |             | 32  R/_W
27                    A0  18 |             | 31  A15
28                    A1  19 |             | 30  A14
29                    A2  20 |             | 29  A13
30                    A3  21 |             | 28  A12
31                 A4/A5  22 |             | 27  A11
32                 A6/A7  23 |             | 26  A10
33                    A8  24 |_____________| 25  A9
34
35**********************************************************************/
36
37#pragma once
38
39#ifndef __MOS8722__
40#define __MOS8722__
41
42#include "emu.h"
43
44
45
46//**************************************************************************
47//  INTERFACE CONFIGURATION MACROS
48//**************************************************************************
49
50#define MCFG_MOS8722_ADD(_tag, _config) \
51   MCFG_DEVICE_ADD(_tag, MOS8722, 0)   \
52   MCFG_DEVICE_CONFIG(_config)
53
54
55#define MOS8722_INTERFACE(name) \
56   const mos8722_interface (name) =
57
58
59
60//**************************************************************************
61//  TYPE DEFINITIONS
62//**************************************************************************
63
64// ======================> mos8722_interface
65
66struct mos8722_interface
67{
68   devcb_write_line   m_out_z80en_cb;
69   devcb_write_line   m_out_fsdir_cb;
70   devcb_read_line      m_in_game_cb;
71   devcb_read_line      m_in_exrom_cb;
72   devcb_read_line      m_in_sense40_cb;
73};
74
75
76// ======================> mos8722_device
77
78class mos8722_device :   public device_t,
79                        public mos8722_interface
80{
81public:
82    // construction/destruction
83    mos8722_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
84
85    DECLARE_READ8_MEMBER( read );
86    DECLARE_WRITE8_MEMBER( write );
87
88    DECLARE_READ_LINE_MEMBER( fsdir_r );
89    DECLARE_READ_LINE_MEMBER( ms0_r );
90    DECLARE_READ_LINE_MEMBER( ms1_r );
91    DECLARE_READ_LINE_MEMBER( ms2_r );
92    DECLARE_READ_LINE_MEMBER( ms3_r );
93
94    offs_t ta_r(offs_t offset, int aec);
95
96protected:
97    // device-level overrides
98   virtual void device_config_complete();
99    virtual void device_start();
100    virtual void device_reset();
101
102private:
103   devcb_resolved_write_line   m_out_z80en_func;
104   devcb_resolved_write_line   m_out_fsdir_func;
105   devcb_resolved_read_line   m_in_game_func;
106   devcb_resolved_read_line   m_in_exrom_func;
107   devcb_resolved_read_line   m_in_sense40_func;
108
109   UINT8 m_reg[10];
110};
111
112
113// device type definition
114extern const device_type MOS8722;
115
116
117
118#endif
trunk/src/mess/mess.mak
r17756r17757
913913   $(MESS_MACHINE)/cbmipt.o   \
914914   $(MESS_MACHINE)/64h156.o   \
915915   $(MESS_MACHINE)/petcass.o   \
916   $(MESS_MACHINE)/mos8722.o   \
916917   $(MESS_MACHINE)/c2n.o      \
917918   $(MESS_VIDEO)/vdc8563.o      \
918919   $(MESS_VIDEO)/vic6567.o      \

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