| /* altair_sys.c: MITS Altair system interface | |
| Copyright (c) 1997-2005, Charles E. Owen | |
| 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 | |
| ROBERT M SUPNIK 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 Charles E. Owen shall not be | |
| used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from Charles E. Owen. | |
| */ | |
| #include <ctype.h> | |
| #include "altair_defs.h" | |
| extern DEVICE cpu_dev; | |
| extern DEVICE dsk_dev; | |
| extern UNIT cpu_unit; | |
| extern REG cpu_reg[]; | |
| extern DEVICE sio_dev; | |
| extern DEVICE ptr_dev; | |
| extern DEVICE ptp_dev; | |
| extern DEVICE lpt_dev; | |
| extern unsigned char M[]; | |
| extern int32 saved_PC; | |
| /* SCP data structures | |
| sim_name simulator name string | |
| sim_PC pointer to saved PC register descriptor | |
| sim_emax number of words needed for examine | |
| sim_devices array of pointers to simulated devices | |
| sim_stop_messages array of pointers to stop messages | |
| sim_load binary loader | |
| */ | |
| char sim_name[] = "Altair 8800"; | |
| REG *sim_PC = &cpu_reg[0]; | |
| int32 sim_emax = 4; | |
| DEVICE *sim_devices[] = { | |
| &cpu_dev, | |
| &sio_dev, | |
| &ptr_dev, | |
| &ptp_dev, | |
| &dsk_dev, | |
| NULL | |
| }; | |
| const char *sim_stop_messages[] = { | |
| "Unknown error", | |
| "Unknown I/O Instruction", | |
| "HALT instruction", | |
| "Breakpoint", | |
| "Invalid Opcode" | |
| }; | |
| static const char *opcode[] = { | |
| "NOP", "LXI B", "STAX B", "INX B", /* 000-003 */ | |
| "INR B", "DCR B", "MVI B", "RLC", /* 004-007 */ | |
| "???", "DAD B", "LDAX B", "DCX B", /* 010-013 */ | |
| "INR C", "DCR C", "MVI C", "RRC", /* 014-017 */ | |
| "???", "LXI D", "STAX D", "INX D", /* 020-023 */ | |
| "INR D", "DCR D", "MVI D", "RAL", /* 024-027 */ | |
| "???", "DAD D", "LDAX D", "DCX D", /* 030-033 */ | |
| "INR E", "DCR E", "MVI E", "RAR", /* 034-037 */ | |
| "???", "LXI H", "SHLD", "INX H", /* 040-043 */ | |
| "INR H", "DCR H", "MVI H", "DAA", /* 044-047 */ | |
| "???", "DAD H", "LHLD", "DCX H", /* 050-053 */ | |
| "INR L", "DCR L", "MVI L", "CMA", /* 054-057 */ | |
| "???", "LXI SP", "STA", "INX SP", /* 060-063 */ | |
| "INR M", "DCR M", "MVI M", "STC", /* 064-067 */ | |
| "???", "DAD SP", "LDA", "DCX SP", /* 070-073 */ | |
| "INR A", "DCR A", "MVI A", "CMC", /* 074-077 */ | |
| "MOV B,B", "MOV B,C", "MOV B,D", "MOV B,E", /* 100-103 */ | |
| "MOV B,H", "MOV B,L", "MOV B,M", "MOV B,A", /* 104-107 */ | |
| "MOV C,B", "MOV C,C", "MOV C,D", "MOV C,E", /* 110-113 */ | |
| "MOV C,H", "MOV C,L", "MOV C,M", "MOV C,A", /* 114-117 */ | |
| "MOV D,B", "MOV D,C", "MOV D,D", "MOV D,E", /* 120-123 */ | |
| "MOV D,H", "MOV D,L", "MOV D,M", "MOV D,A", /* 124-127 */ | |
| "MOV E,B", "MOV E,C", "MOV E,D", "MOV E,E", /* 130-133 */ | |
| "MOV E,H", "MOV E,L", "MOV E,M", "MOV E,A", /* 134-137 */ | |
| "MOV H,B", "MOV H,C", "MOV H,D", "MOV H,E", /* 140-143 */ | |
| "MOV H,H", "MOV H,L", "MOV H,M", "MOV H,A", /* 144-147 */ | |
| "MOV L,B", "MOV L,C", "MOV L,D", "MOV L,E", /* 150-153 */ | |
| "MOV L,H", "MOV L,L", "MOV L,M", "MOV L,A", /* 154-157 */ | |
| "MOV M,B", "MOV M,C", "MOV M,D", "MOV M,E", /* 160-163 */ | |
| "MOV M,H", "MOV M,L", "HLT", "MOV M,A", /* 164-167 */ | |
| "MOV A,B", "MOV A,C", "MOV A,D", "MOV A,E", /* 170-173 */ | |
| "MOV A,H", "MOV A,L", "MOV A,M", "MOV A,A", /* 174-177 */ | |
| "ADD B", "ADD C", "ADD D", "ADD E", /* 200-203 */ | |
| "ADD H", "ADD L", "ADD M", "ADD A", /* 204-207 */ | |
| "ADC B", "ADC C", "ADC D", "ADC E", /* 210-213 */ | |
| "ADC H", "ADC L", "ADC M", "ADC A", /* 214-217 */ | |
| "SUB B", "SUB C", "SUB D", "SUB E", /* 220-223 */ | |
| "SUB H", "SUB L", "SUB M", "SUB A", /* 224-227 */ | |
| "SBB B", "SBB C", "SBB D", "SBB E", /* 230-233 */ | |
| "SBB H", "SBB L", "SBB M", "SBB A", /* 234-237 */ | |
| "ANA B", "ANA C", "ANA D", "ANA E", /* 240-243 */ | |
| "ANA H", "ANA L", "ANA M", "ANA A", /* 244-247 */ | |
| "XRA B", "XRA C", "XRA D", "XRA E", /* 250-253 */ | |
| "XRA H", "XRA L", "XRA M", "XRA A", /* 254-257 */ | |
| "ORA B", "ORA C", "ORA D", "ORA E", /* 260-263 */ | |
| "ORA H", "ORA L", "ORA M", "ORA A", /* 264-267 */ | |
| "CMP B", "CMP C", "CMP D", "CMP E", /* 270-273 */ | |
| "CMP H", "CMP L", "CMP M", "CMP A", /* 274-277 */ | |
| "RNZ", "POP B", "JNZ", "JMP", /* 300-303 */ | |
| "CNZ", "PUSH B", "ADI", "RST 0", /* 304-307 */ | |
| "RZ", "RET", "JZ", "???", /* 310-313 */ | |
| "CZ", "CALL", "ACI", "RST 1", /* 314-317 */ | |
| "RNC", "POP D", "JNC", "OUT", /* 320-323 */ | |
| "CNC", "PUSH D", "SUI", "RST 2", /* 324-327 */ | |
| "RC", "???", "JC", "IN", /* 330-333 */ | |
| "CC", "???", "SBI", "RST 3", /* 334-337 */ | |
| "RPO", "POP H", "JPO", "XTHL", /* 340-343 */ | |
| "CPO", "PUSH H", "ANI", "RST 4", /* 344-347 */ | |
| "RPE", "PCHL", "JPE", "XCHG", /* 350-353 */ | |
| "CPE", "???", "XRI", "RST 5", /* 354-357 */ | |
| "RP", "POP PSW", "JP", "DI", /* 360-363 */ | |
| "CP", "PUSH PSW", "ORI", "RST 6", /* 364-367 */ | |
| "RM", "SPHL", "JM", "EI", /* 370-373 */ | |
| "CM", "???", "CPI", "RST 7", /* 374-377 */ | |
| }; | |
| int32 oplen[256] = { | |
| 1,3,1,1,1,1,2,1,0,1,1,1,1,1,2,1,0,3,1,1,1,1,2,1,0,1,1,1,1,1,2,1, | |
| 0,3,3,1,1,1,2,1,0,1,3,1,1,1,2,1,0,3,3,1,1,1,2,1,0,1,3,1,1,1,2,1, | |
| 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, | |
| 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, | |
| 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, | |
| 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, | |
| 1,1,3,3,3,1,2,1,1,1,3,0,3,3,2,1,1,1,3,2,3,1,2,1,1,0,3,2,3,0,2,1, | |
| 1,1,3,1,3,1,2,1,1,1,3,1,3,0,2,1,1,1,3,1,3,1,2,1,1,1,3,1,3,0,2,1 }; | |
| /* This is the binary loader. The input file is considered to be | |
| a string of literal bytes with no format special format. The | |
| load starts at the current value of the PC. | |
| */ | |
| t_stat sim_load (FILE *fileref, CONST char *cptr, CONST char *fnam, int flag) | |
| { | |
| int32 i, addr = 0, cnt = 0; | |
| if ((*cptr != 0) || (flag != 0)) return SCPE_ARG; | |
| addr = saved_PC; | |
| while ((i = getc (fileref)) != EOF) { | |
| M[addr] = i; | |
| addr++; | |
| cnt++; | |
| } /* end while */ | |
| sim_printf ("%d Bytes loaded.\n", cnt); | |
| return (SCPE_OK); | |
| } | |
| /* Symbolic output | |
| Inputs: | |
| *of = output stream | |
| addr = current PC | |
| *val = pointer to values | |
| *uptr = pointer to unit | |
| sw = switches | |
| Outputs: | |
| status = error code | |
| */ | |
| t_stat fprint_sym (FILE *of, t_addr addr, t_value *val, | |
| UNIT *uptr, int32 sw) | |
| { | |
| int32 cflag, c1, c2, inst, adr; | |
| cflag = (uptr == NULL) || (uptr == &cpu_unit); | |
| c1 = (val[0] >> 8) & 0177; | |
| c2 = val[0] & 0177; | |
| if (sw & SWMASK ('A')) { | |
| fprintf (of, (c2 < 040)? "<%03o>": "%c", c2); | |
| return SCPE_OK; | |
| } | |
| if (sw & SWMASK ('C')) { | |
| fprintf (of, (c1 < 040)? "<%03o>": "%c", c1); | |
| fprintf (of, (c2 < 040)? "<%03o>": "%c", c2); | |
| return SCPE_OK; | |
| } | |
| if (!(sw & SWMASK ('M'))) return SCPE_ARG; | |
| inst = val[0]; | |
| fprintf (of, "%s", opcode[inst]); | |
| if (oplen[inst] == 2) { | |
| if (strchr(opcode[inst], ' ') != NULL) | |
| fprintf (of, ","); | |
| else fprintf (of, " "); | |
| fprintf (of, "%o", val[1]); | |
| } | |
| if (oplen[inst] == 3) { | |
| adr = val[1] & 0xFF; | |
| adr |= (val[2] << 8) & 0xff00; | |
| if (strchr(opcode[inst], ' ') != NULL) | |
| fprintf (of, ","); | |
| else fprintf (of, " "); | |
| fprintf (of, "%o", adr); | |
| } | |
| return -(oplen[inst] - 1); | |
| } | |
| /* Symbolic input | |
| Inputs: | |
| *cptr = pointer to input string | |
| addr = current PC | |
| *uptr = pointer to unit | |
| *val = pointer to output values | |
| sw = switches | |
| Outputs: | |
| status = error status | |
| */ | |
| t_stat parse_sym (CONST char *cptr, t_addr addr, UNIT *uptr, t_value *val, int32 sw) | |
| { | |
| int32 cflag, i = 0, j, r; | |
| char gbuf[CBUFSIZE]; | |
| memset (gbuf, 0, sizeof (gbuf)); | |
| cflag = (uptr == NULL) || (uptr == &cpu_unit); | |
| while (isspace (*cptr)) cptr++; /* absorb spaces */ | |
| if ((sw & SWMASK ('A')) || ((*cptr == '\'') && cptr++)) { /* ASCII char? */ | |
| if (cptr[0] == 0) return SCPE_ARG; /* must have 1 char */ | |
| val[0] = (uint32) cptr[0]; | |
| return SCPE_OK; | |
| } | |
| if ((sw & SWMASK ('C')) || ((*cptr == '"') && cptr++)) { /* ASCII string? */ | |
| if (cptr[0] == 0) return SCPE_ARG; /* must have 1 char */ | |
| val[0] = ((uint32) cptr[0] << 8) + (uint32) cptr[1]; | |
| return SCPE_OK; | |
| } | |
| /* An instruction: get opcode (all characters until null, comma, | |
| or numeric (including spaces). | |
| */ | |
| while (i < sizeof (gbuf) - 4) { | |
| if (*cptr == ',' || *cptr == '\0' || | |
| sim_isdigit(*cptr)) | |
| break; | |
| gbuf[i] = toupper(*cptr); | |
| cptr++; | |
| i++; | |
| } | |
| /* Allow for RST which has numeric as part of opcode */ | |
| if (toupper(gbuf[0]) == 'R' && | |
| toupper(gbuf[1]) == 'S' && | |
| toupper(gbuf[2]) == 'T') { | |
| gbuf[i] = toupper(*cptr); | |
| cptr++; | |
| i++; | |
| } | |
| /* Allow for 'MOV' which is only opcode that has comma in it. */ | |
| if (toupper(gbuf[0]) == 'M' && | |
| toupper(gbuf[1]) == 'O' && | |
| toupper(gbuf[2]) == 'V') { | |
| gbuf[i] = toupper(*cptr); | |
| cptr++; | |
| i++; | |
| gbuf[i] = toupper(*cptr); | |
| cptr++; | |
| i++; | |
| } | |
| /* kill trailing spaces if any */ | |
| gbuf[i] = '\0'; | |
| sim_trim_endspc (gbuf); | |
| /* find opcode in table */ | |
| for (j = 0; j < 256; j++) { | |
| if (strcmp(gbuf, opcode[j]) == 0) | |
| break; | |
| } | |
| if (j > 255) /* not found */ | |
| return sim_messagef (SCPE_ARG, "No such opcode: %s\n", gbuf); | |
| val[0] = j; /* store opcode */ | |
| if (oplen[j] < 2) /* if 1-byter we are done */ | |
| return SCPE_OK; | |
| if (*cptr == ',') cptr++; | |
| cptr = get_glyph(cptr, gbuf, 0); /* get address */ | |
| sscanf(gbuf, "%o", &r); | |
| if (oplen[j] == 2) { | |
| val[1] = r & 0xFF; | |
| return (-1); | |
| } | |
| val[1] = r & 0xFF; | |
| val[2] = (r >> 8) & 0xFF; | |
| return (-2); | |
| } |