1 /* mp-a2.c: SWTP MP-A2 M6800 CPU simulator
2
3 Copyright (c) 2011, William Beech
4
5 Permission is hereby granted, free of charge, to any person obtaining a
6 copy of this software and associated documentation files (the "Software"),
7 to deal in the Software without restriction, including without limitation
8 the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 and/or sell copies of the Software, and to permit persons to whom the
10 Software is furnished to do so, subject to the following conditions:
11
12 The above copyright notice and this permission notice shall be included in
13 all copies or substantial portions of the Software.
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
19 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22 Except as contained in this notice, the name of William A. Beech shall not
23 be used in advertising or otherwise to promote the sale, use or other dealings
24 in this Software without prior written authorization from William A. Beech.
25
26 The MP-A2 CPU Board contains the following devices [mp-a2.c]:
27 M6800 processor [m6800.c].
28 M6810 128 byte RAM at 0xA000 [m6810.c].
29 M6830, SWTBUG, or custom boot ROM at 0xE000 [bootrom.c].
30 4 ea 2716 EPROMs at either 0xC000, 0xC800, 0xD000 and 0xD800 (LO_PROM)or
31 0xE000, 0xE800, 0xF000 and 0xF800 (HI_PROM) [eprom.c].
32 Interface to the SS-50 bus and the MP-B2 Mother Board for I/O
33 and memory boards [mp-b2.c].
34 Note: The file names of the emulator source programs for each device are
35 contained in "[]".
36 */
37
38 #include <stdio.h>
39 #include "swtp_defs.h"
40
41 #define UNIT_V_USER_D (UNIT_V_UF) /* user defined switch */
42 #define UNIT_USER_D (1 << UNIT_V_USER_D)
43 #define UNIT_V_4K_8K (UNIT_V_UF+1) /* off if HI_PROM and only 2K EPROM */
44 #define UNIT_4K_8K (1 << UNIT_V_4K_8K)
45 #define UNIT_V_SWT (UNIT_V_UF+2) /* on SWTBUG, off MIKBUG */
46 #define UNIT_SWT (1 << UNIT_V_SWT)
47 #define UNIT_V_8K (UNIT_V_UF+3) /* off if HI_PROM and only 2K or 4k EPROM */
48 #define UNIT_8K (1 << UNIT_V_8K)
49 #define UNIT_V_RAM (UNIT_V_UF+4) /* off disables 6810 RAM */
50 #define UNIT_RAM (1 << UNIT_V_RAM)
51 #define UNIT_V_LO_PROM (UNIT_V_UF+5) /* on EPROMS @ C000-CFFFH, off no EPROMS */
52 #define UNIT_LO_PROM (1 << UNIT_V_LO_PROM)
53 #define UNIT_V_HI_PROM (UNIT_V_UF+6) /* on EPROMS @ F000-FFFFH, off fo LO_PROM, MON, or no EPROMS */
54 #define UNIT_HI_PROM (1 << UNIT_V_HI_PROM)
55 #define UNIT_V_MON (UNIT_V_UF+7) /* on for monitor vectors in high memory */
56 #define UNIT_MON (1 << UNIT_V_MON)
57
58 /* local global variables */
59
60 /* function prototypes */
61
62 int32 get_base(void);
63 int32 CPU_BD_get_mbyte(int32 addr);
64 int32 CPU_BD_get_mword(int32 addr);
65 void CPU_BD_put_mbyte(int32 addr, int32 val);
66 void CPU_BD_put_mword(int32 addr, int32 val);
67
68 /* external routines */
69
70 /* MP-B2 bus routines */
71 extern int32 MB_get_mbyte(int32 addr);
72 extern int32 MB_get_mword(int32 addr);
73 extern void MB_put_mbyte(int32 addr, int32 val);
74 extern void MB_put_mword(int32 addr, int32 val);
75
76 /* M6810 bus routines */
77 extern int32 m6810_get_mbyte(int32 addr);
78 extern void m6810_put_mbyte(int32 addr, int32 val);
79
80 /* BOOTROM bus routines */
81 extern UNIT BOOTROM_unit;
82 extern int32 BOOTROM_get_mbyte(int32 offset);
83
84 /* I2716 bus routines */
85 extern int32 i2716_get_mbyte(int32 offset);
86
87 /* MP-A2 data structures
88
89 CPU_BD_dev MP-A2 device descriptor
90 CPU_BD_unit MP-A2 unit descriptor
91 CPU_BD_reg MP-A2 register list
92 CPU_BD_mod MP-A2 modifiers list */
93
94 UNIT CPU_BD_unit = { UDATA (NULL, 0, 0) };
95
96 REG CPU_BD_reg[] = {
97 { NULL }
98 };
99
100 MTAB CPU_BD_mod[] = {
101 { UNIT_USER_D, UNIT_USER_D, "USER_D", "USER_D", NULL },
102 { UNIT_USER_D, 0, "NOUSER_D", "NOUSER_D", NULL },
103 { UNIT_4K_8K, UNIT_4K_8K, "4K_8K", "4K_8K", NULL },
104 { UNIT_4K_8K, 0, "NO4K_8K", "NO4K_8K", NULL },
105 { UNIT_SWT, UNIT_SWT, "SWT", "SWT", NULL },
106 { UNIT_SWT, 0, "NOSWT", "NOSWT", NULL },
107 { UNIT_8K, UNIT_8K, "8K", "8K", NULL },
108 { UNIT_8K, 0, "NO8K", "NO8K", NULL },
109 { UNIT_RAM, UNIT_RAM, "RAM", "RAM", NULL },
110 { UNIT_RAM, 0, "NORAM", "NORAM", NULL },
111 { UNIT_LO_PROM, UNIT_LO_PROM, "LO_PROM", "LO_PROM", NULL },
112 { UNIT_LO_PROM, 0, "NOLO_PROM", "NOLO_PROM", NULL },
113 { UNIT_HI_PROM, UNIT_HI_PROM, "HI_PROM", "HI_PROM", NULL },
114 { UNIT_HI_PROM, 0, "NOHI_PROM", "NOHI_PROM", NULL },
115 { UNIT_MON, UNIT_MON, "MON", "MON", NULL },
116 { UNIT_MON, 0, "NOMON", "NOMON", NULL },
117 { 0 }
118 };
119
120 DEBTAB CPU_BD_debug[] = {
121 { "ALL", DEBUG_all },
122 { "FLOW", DEBUG_flow },
123 { "READ", DEBUG_read },
124 { "WRITE", DEBUG_write },
125 { "LEV1", DEBUG_level1 },
126 { "LEV2", DEBUG_level2 },
127 { NULL }
128 };
129
130 DEVICE CPU_BD_dev = {
131 "MP-A2", //name
132 &CPU_BD_unit, //units
133 CPU_BD_reg, //registers
134 CPU_BD_mod, //modifiers
135 1, //numunits
136 16, //aradix
137 16, //awidth
138 1, //aincr
139 16, //dradix
140 8, //dwidth
141 NULL, //examine
142 NULL, //deposit
143 NULL, //reset
144 NULL, //boot
145 NULL, //attach
146 NULL, //detach
147 NULL, //ctxt
148 DEV_DEBUG, //flags
149 0, //dctrl
150 CPU_BD_debug, /* debflags */
151 NULL, //msize
152 NULL //lname
153 };
154
155 /* get base address of 2716's */
156
get_base(void)157 int32 get_base(void)
158 {
159 if (CPU_BD_unit.flags & UNIT_LO_PROM)
160 return 0xC000;
161 else if (CPU_BD_unit.flags & UNIT_HI_PROM)
162 return 0xF000;
163 return 0;
164 }
165
166 /* get a byte from memory */
167
CPU_BD_get_mbyte(int32 addr)168 int32 CPU_BD_get_mbyte(int32 addr)
169 {
170 int32 val;
171
172 if (CPU_BD_dev.dctrl & DEBUG_read)
173 printf("CPU_BD_get_mbyte: addr=%04X\n", addr);
174 switch(addr & 0xF000) {
175 case 0xA000:
176 if (CPU_BD_unit.flags & UNIT_RAM) {
177 val = m6810_get_mbyte(addr - 0xA000) & 0xFF;
178 if (CPU_BD_dev.dctrl & DEBUG_read)
179 printf("CPU_BD_get_mbyte: m6810 val=%02X\n", val);
180 return val;
181 } else {
182 val = MB_get_mbyte(addr) & 0xFF;
183 if (CPU_BD_dev.dctrl & DEBUG_read)
184 printf("CPU_BD_get_mbyte: m6810 val=%02X\n", val);
185 return val;
186 }
187 case 0xC000:
188 if (CPU_BD_unit.flags & UNIT_LO_PROM) {
189 val = i2716_get_mbyte(addr - 0xC000) & 0xFF;
190 if (CPU_BD_dev.dctrl & DEBUG_read)
191 printf("CPU_BD_get_mbyte: 2716=%02X\n", val);
192 return val;
193 } else
194 return 0xFF;
195 break;
196 case 0xE000:
197 val = BOOTROM_get_mbyte(addr - 0xE000) & 0xFF;
198 if (CPU_BD_dev.dctrl & DEBUG_read)
199 printf("CPU_BD_get_mbyte: EPROM=%02X\n", val);
200 return val;
201 case 0xF000:
202 if (CPU_BD_unit.flags & UNIT_MON) {
203 val = BOOTROM_get_mbyte(addr - (0x10000 - BOOTROM_unit.capac)) & 0xFF;
204 if (CPU_BD_dev.dctrl & DEBUG_read)
205 printf("CPU_BD_get_mbyte: EPROM=%02X\n", val);
206 return val;
207 }
208 default:
209 val = MB_get_mbyte(addr) & 0xFF;
210 if (CPU_BD_dev.dctrl & DEBUG_read)
211 printf("CPU_BD_get_mbyte: mp_b2 val=%02X\n", val);
212 return val;
213 }
214 }
215
216 /* get a word from memory */
217
CPU_BD_get_mword(int32 addr)218 int32 CPU_BD_get_mword(int32 addr)
219 {
220 int32 val;
221
222 if (CPU_BD_dev.dctrl & DEBUG_read)
223 printf("CPU_BD_get_mword: addr=%04X\n", addr);
224 val = (CPU_BD_get_mbyte(addr) << 8);
225 val |= CPU_BD_get_mbyte(addr+1);
226 val &= 0xFFFF;
227 if (CPU_BD_dev.dctrl & DEBUG_read)
228 printf("CPU_BD_get_mword: val=%04X\n", val);
229 return val;
230 }
231
232 /* put a byte to memory */
233
CPU_BD_put_mbyte(int32 addr,int32 val)234 void CPU_BD_put_mbyte(int32 addr, int32 val)
235 {
236 if (CPU_BD_dev.dctrl & DEBUG_write)
237 printf("CPU_BD_put_mbyte: addr=%04X, val=%02X\n", addr, val);
238 switch(addr & 0xF000) {
239 case 0xA000:
240 if (CPU_BD_unit.flags & UNIT_RAM) {
241 m6810_put_mbyte(addr - 0xA000, val);
242 return;
243 } else {
244 MB_put_mbyte(addr, val);
245 return;
246 }
247 default:
248 MB_put_mbyte(addr, val);
249 return;
250 }
251 }
252
253 /* put a word to memory */
254
CPU_BD_put_mword(int32 addr,int32 val)255 void CPU_BD_put_mword(int32 addr, int32 val)
256 {
257 if (CPU_BD_dev.dctrl & DEBUG_write)
258 printf("CPU_BD_put_mword: addr=%04X, val=%04X\n", addr, val);
259 CPU_BD_put_mbyte(addr, val >> 8);
260 CPU_BD_put_mbyte(addr+1, val);
261 }
262
263 /* end of mp-a2.c */
264