| /* mp-a.c: SWTP MP-A M6800 CPU simulator | |
| Copyright (c) 2011, William Beech | |
| Permission is hereby granted, free of charge, to any person obtaining a | |
| copy of this software and associated documentation files (the "Software"), | |
| to deal in the Software without restriction, including without limitation | |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| and/or sell copies of the Software, and to permit persons to whom the | |
| Software is furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in | |
| all copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| Except as contained in this notice, the name of William A. Beech shall not | |
| be used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from William A. Beech. | |
| The MP-A CPU Board contains the following devices [mp-a.c]: | |
| M6800 processor [m6800.c]. | |
| M6810 128 byte RAM at 0xA000 [m6810.c]. | |
| M6830, SWTBUG, or custom boot ROM at 0xE000 [bootrom.c]. | |
| Interface to the SS-50 bus and the MP-B2 Mother Board for I/O | |
| and memory boards [mp-b2.c]. | |
| Note: The file names of the emulator source programs for each device are | |
| contained in "[]". | |
| */ | |
| #include <stdio.h> | |
| #include "swtp_defs.h" | |
| #define UNIT_V_SWT (UNIT_V_UF) /* on SWTBUG, off MIKBUG */ | |
| #define UNIT_SWT (1 << UNIT_V_SWT) | |
| #define UNIT_V_RAM (UNIT_V_UF+1) /* off disables 6810 RAM */ | |
| #define UNIT_RAM (1 << UNIT_V_RAM) | |
| /* local global variables */ | |
| /* function prototypes */ | |
| int32 CPU_BD_get_mbyte(int32 addr); | |
| int32 CPU_BD_get_mword(int32 addr); | |
| void CPU_BD_put_mbyte(int32 addr, int32 val); | |
| void CPU_BD_put_mword(int32 addr, int32 val); | |
| /* external routines */ | |
| /* MP-B2 bus routines */ | |
| extern int32 MB_get_mbyte(int32 addr); | |
| extern int32 MB_get_mword(int32 addr); | |
| extern void MB_put_mbyte(int32 addr, int32 val); | |
| extern void MB_put_mword(int32 addr, int32 val); | |
| /* M6810 bus routines */ | |
| extern int32 m6810_get_mbyte(int32 addr); | |
| extern void m6810_put_mbyte(int32 addr, int32 val); | |
| /* BOOTROM bus routines */ | |
| extern UNIT BOOTROM_unit; | |
| extern int32 BOOTROM_get_mbyte(int32 offset); | |
| /* MP-A data structures | |
| CPU_BD_dev MP-A2 device descriptor | |
| CPU_BD_unit MP-A2 unit descriptor | |
| CPU_BD_reg MP-A2 register list | |
| CPU_BD_mod MP-A2 modifiers list */ | |
| UNIT CPU_BD_unit = { UDATA (NULL, 0, 0) }; | |
| REG CPU_BD_reg[] = { | |
| { NULL } | |
| }; | |
| MTAB CPU_BD_mod[] = { | |
| { UNIT_SWT, UNIT_SWT, "SWT", "SWT", NULL }, | |
| { UNIT_SWT, 0, "NOSWT", "NOSWT", NULL }, | |
| { UNIT_RAM, UNIT_RAM, "RAM", "RAM", NULL }, | |
| { UNIT_RAM, 0, "NORAM", "NORAM", NULL }, | |
| { 0 } | |
| }; | |
| DEBTAB CPU_BD_debug[] = { | |
| { "ALL", DEBUG_all }, | |
| { "FLOW", DEBUG_flow }, | |
| { "READ", DEBUG_read }, | |
| { "WRITE", DEBUG_write }, | |
| { "LEV1", DEBUG_level1 }, | |
| { "LEV2", DEBUG_level2 }, | |
| { NULL } | |
| }; | |
| DEVICE CPU_BD_dev = { | |
| "MP-A", //name | |
| &CPU_BD_unit, //units | |
| CPU_BD_reg, //registers | |
| CPU_BD_mod, //modifiers | |
| 1, //numunits | |
| 16, //aradix | |
| 16, //awidth | |
| 1, //aincr | |
| 16, //dradix | |
| 8, //dwidth | |
| NULL, //examine | |
| NULL, //deposit | |
| NULL, //reset | |
| NULL, //boot | |
| NULL, //attach | |
| NULL, //detach | |
| NULL, //ctxt | |
| DEV_DEBUG, //flags | |
| 0, //dctrl | |
| CPU_BD_debug, /* debflags */ | |
| NULL, //msize | |
| NULL //lname | |
| }; | |
| /* get a byte from memory */ | |
| int32 CPU_BD_get_mbyte(int32 addr) | |
| { | |
| int32 val; | |
| if (CPU_BD_dev.dctrl & DEBUG_read) | |
| printf("CPU_BD_get_mbyte: addr=%04X\n", addr); | |
| switch(addr & 0xF000) { | |
| case 0xA000: | |
| if (CPU_BD_unit.flags & UNIT_RAM) { | |
| val = m6810_get_mbyte(addr - 0xA000) & 0xFF; | |
| if (CPU_BD_dev.dctrl & DEBUG_read) | |
| printf("CPU_BD_get_mbyte: m6810 val=%02X\n", val); | |
| return val; | |
| } else { | |
| val = MB_get_mbyte(addr) & 0xFF; | |
| if (CPU_BD_dev.dctrl & DEBUG_read) | |
| printf("CPU_BD_get_mbyte: m6810 val=%02X\n", val); | |
| return val; | |
| } | |
| case 0xE000: | |
| val = BOOTROM_get_mbyte(addr - 0xE000) & 0xFF; | |
| if (CPU_BD_dev.dctrl & DEBUG_read) | |
| printf("CPU_BD_get_mbyte: EPROM=%02X\n", val); | |
| return val; | |
| case 0xF000: | |
| val = BOOTROM_get_mbyte(addr - (0x10000 - BOOTROM_unit.capac)) & 0xFF; | |
| if (CPU_BD_dev.dctrl & DEBUG_read) | |
| printf("CPU_BD_get_mbyte: EPROM=%02X\n", val); | |
| return val; | |
| default: | |
| val = MB_get_mbyte(addr) & 0xFF; | |
| if (CPU_BD_dev.dctrl & DEBUG_read) | |
| printf("CPU_BD_get_mbyte: mp_b2 val=%02X\n", val); | |
| return val; | |
| } | |
| } | |
| /* get a word from memory */ | |
| int32 CPU_BD_get_mword(int32 addr) | |
| { | |
| int32 val; | |
| if (CPU_BD_dev.dctrl & DEBUG_read) | |
| printf("CPU_BD_get_mword: addr=%04X\n", addr); | |
| val = (CPU_BD_get_mbyte(addr) << 8); | |
| val |= CPU_BD_get_mbyte(addr+1); | |
| val &= 0xFFFF; | |
| if (CPU_BD_dev.dctrl & DEBUG_read) | |
| printf("CPU_BD_get_mword: val=%04X\n", val); | |
| return val; | |
| } | |
| /* put a byte to memory */ | |
| void CPU_BD_put_mbyte(int32 addr, int32 val) | |
| { | |
| if (CPU_BD_dev.dctrl & DEBUG_write) | |
| printf("CPU_BD_put_mbyte: addr=%04X, val=%02X\n", addr, val); | |
| switch(addr & 0xF000) { | |
| case 0xA000: | |
| if (CPU_BD_unit.flags & UNIT_RAM) { | |
| m6810_put_mbyte(addr - 0xA000, val); | |
| return; | |
| } else { | |
| MB_put_mbyte(addr, val); | |
| return; | |
| } | |
| default: | |
| MB_put_mbyte(addr, val); | |
| return; | |
| } | |
| } | |
| /* put a word to memory */ | |
| void CPU_BD_put_mword(int32 addr, int32 val) | |
| { | |
| if (CPU_BD_dev.dctrl & DEBUG_write) | |
| printf("CPU_BD_put_mword: addr=%04X, val=%04X\n", addr, val); | |
| CPU_BD_put_mbyte(addr, val >> 8); | |
| CPU_BD_put_mbyte(addr+1, val); | |
| } | |
| /* end of mp-a.c */ |