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- /*
- * a2, an Apple II emulator in C
- * (c) Copyright 1990 by Rich Skrenta
- *
- * Command line interface written by Tom Markson
- *
- * Distribution agreement:
- *
- * You may freely copy or redistribute this software, so long
- * as there is no profit made from its use, sale, trade or
- * reproduction. You may not change this copyright notice,
- * and it must be included prominently in any copy made.
- *
- * Send emulator related mail to: skrenta@blekko.commodore.com
- * skrenta@blekko.uucp
- */
-
-
-
- #include <stdio.h>
- #include "a2.h"
-
-
-
- struct op_info opcode[] = {
- {"brk", M_NONE}, /* 0x0 */
- {"ora", M_INDX}, /* 0x1 */
- {"", M_NONE}, /* 0x2 */
- {"", M_NONE}, /* 0x3 */
- {"tsb", M_ZP}, /* 0x4 */ /* 65C02 */
- {"ora", M_ZP}, /* 0x5 */
- {"asl", M_ZP}, /* 0x6 */
- {"", M_NONE}, /* 0x7 */
- {"php", M_NONE}, /* 0x8 */
- {"ora", M_IMM}, /* 0x9 */
- {"asl", M_NONE}, /* 0xa */
- {"", M_NONE}, /* 0xb */
- {"tsb", M_ABS}, /* 0xc */ /* 65C02 */
- {"ora", M_ABS}, /* 0xd */
- {"asl", M_ABS}, /* 0xe */
- {"", M_NONE}, /* 0xf */
- {"bpl", M_REL}, /* 0x10 */
- {"ora", M_INDY}, /* 0x11 */
- {"ora", M_ZIND}, /* 0x12 */ /* 65C02 */
- {"", M_NONE}, /* 0x13 */
- {"trb", M_ZP}, /* 0x14 */ /* 65C02 */
- {"ora", M_ZPX}, /* 0x15 */
- {"asl", M_ZPX}, /* 0x16 */
- {"", M_NONE}, /* 0x17 */
- {"clc", M_NONE}, /* 0x18 */
- {"ora", M_ABSY}, /* 0x19 */
- {"ina", M_NONE}, /* 0x1a */ /* 65C02 */
- {"", M_NONE}, /* 0x1b */
- {"trb", M_ABS}, /* 0x1c */ /* 65C02 */
- {"ora", M_ABSX}, /* 0x1d */
- {"asl", M_ABSX}, /* 0x1e */
- {"", M_NONE}, /* 0x1f */
- {"jsr", M_ABS}, /* 0x20 */
- {"and", M_INDX}, /* 0x21 */
- {"", M_NONE}, /* 0x22 */
- {"", M_NONE}, /* 0x23 */
- {"bit", M_ZP}, /* 0x24 */
- {"and", M_ZP}, /* 0x25 */
- {"rol", M_ZP}, /* 0x26 */
- {"", M_NONE}, /* 0x27 */
- {"plp", M_NONE}, /* 0x28 */
- {"and", M_IMM}, /* 0x29 */
- {"rol", M_NONE}, /* 0x2a */
- {"", M_NONE}, /* 0x2b */
- {"bit", M_ABS}, /* 0x2c */
- {"and", M_ABS}, /* 0x2d */
- {"rol", M_ABS}, /* 0x2e */
- {"", M_NONE}, /* 0x2f */
- {"bmi", M_REL}, /* 0x30 */
- {"and", M_INDY}, /* 0x31 */
- {"and", M_ZIND}, /* 0x32 */ /* 65C02 */
- {"", M_NONE}, /* 0x33 */
- {"bit", M_ZPX}, /* 0x34 */ /* 65C02 */
- {"and", M_ZPX}, /* 0x35 */
- {"rol", M_ZPX}, /* 0x36 */
- {"", M_NONE}, /* 0x37 */
- {"sec", M_NONE}, /* 0x38 */
- {"and", M_ABSY}, /* 0x39 */
- {"dey", M_NONE}, /* 0x3a */ /* 65C02 */
- {"", M_NONE}, /* 0x3b */
- {"bit", M_ABSX}, /* 0x3c */ /* 65C02 */
- {"and", M_ABSX}, /* 0x3d */
- {"rol", M_ABSX}, /* 0x3e */
- {"", M_NONE}, /* 0x3f */
- {"rti", M_NONE}, /* 0x40 */
- {"eor", M_INDX}, /* 0x41 */
- {"", M_NONE}, /* 0x42 */
- {"", M_NONE}, /* 0x43 */
- {"", M_NONE}, /* 0x44 */
- {"eor", M_ZP}, /* 0x45 */
- {"lsr", M_ZP}, /* 0x46 */
- {"", M_NONE}, /* 0x47 */
- {"pha", M_NONE}, /* 0x48 */
- {"eor", M_IMM}, /* 0x49 */
- {"lsr", M_NONE}, /* 0x4a */
- {"", M_NONE}, /* 0x4b */
- {"jmp", M_ABS}, /* 0x4c */
- {"eor", M_ABS}, /* 0x4d */
- {"lsr", M_ABS}, /* 0x4e */
- {"", M_NONE}, /* 0x4f */
- {"bvc", M_REL}, /* 0x50 */
- {"eor", M_INDY}, /* 0x51 */
- {"eor", M_ZIND}, /* 0x52 */ /* 65C02 */
- {"", M_NONE}, /* 0x53 */
- {"", M_NONE}, /* 0x54 */
- {"eor", M_ZPX}, /* 0x55 */
- {"lsr", M_ZPX}, /* 0x56 */
- {"", M_NONE}, /* 0x57 */
- {"cli", M_NONE}, /* 0x58 */
- {"eor", M_ABSY}, /* 0x59 */
- {"phy", M_NONE}, /* 0x5a */ /* 65C02 */
- {"", M_NONE}, /* 0x5b */
- {"", M_NONE}, /* 0x5c */
- {"eor", M_ABSX}, /* 0x5d */
- {"lsr", M_ABSX}, /* 0x5e */
- {"", M_NONE}, /* 0x5f */
- {"rts", M_NONE}, /* 0x60 */
- {"adc", M_INDX}, /* 0x61 */
- {"", M_NONE}, /* 0x62 */
- {"", M_NONE}, /* 0x63 */
- {"stz", M_ZP}, /* 0x64 */ /* 65C02 */
- {"adc", M_ZP}, /* 0x65 */
- {"ror", M_ZP}, /* 0x66 */
- {"", M_NONE}, /* 0x67 */
- {"pla", M_NONE}, /* 0x68 */
- {"adc", M_IMM}, /* 0x69 */
- {"ror", M_NONE}, /* 0x6a */
- {"", M_NONE}, /* 0x6b */
- {"jmp", M_IND}, /* 0x6c */
- {"adc", M_ABS}, /* 0x6d */
- {"ror", M_ABS}, /* 0x6e */
- {"", M_NONE}, /* 0x6f */
- {"bvs", M_REL}, /* 0x70 */
- {"adc", M_INDX}, /* 0x71 */
- {"adc", M_ZIND}, /* 0x72 */ /* 65C02 */
- {"", M_NONE}, /* 0x73 */
- {"stz", M_ZPX}, /* 0x74 */ /* 65C02 */
- {"adc", M_ZPX}, /* 0x75 */
- {"ror", M_ZPX}, /* 0x76 */
- {"", M_NONE}, /* 0x77 */
- {"sei", M_NONE}, /* 0x78 */
- {"adc", M_ABSY}, /* 0x79 */
- {"ply", M_NONE}, /* 0x7a */ /* 65C02 */
- {"", M_NONE}, /* 0x7b */
- {"jmp", M_ABINDX}, /* 0x7c */ /* 65C02 */
- {"adc", M_ABSX}, /* 0x7d */
- {"ror", M_ABSX}, /* 0x7e */
- {"", M_NONE}, /* 0x7f */
- {"bra", M_REL}, /* 0x80 */ /* 65C02 */
- {"sta", M_INDX}, /* 0x81 */
- {"", M_NONE}, /* 0x82 */
- {"", M_NONE}, /* 0x83 */
- {"sty", M_ZP}, /* 0x84 */
- {"sta", M_ZP}, /* 0x85 */
- {"stx", M_ZP}, /* 0x86 */
- {"", M_NONE}, /* 0x87 */
- {"dey", M_NONE}, /* 0x88 */
- {"", M_NONE}, /* 0x89 */
- {"txa", M_NONE}, /* 0x8a */
- {"", M_NONE}, /* 0x8b */
- {"sty", M_ABS}, /* 0x8c */
- {"sta", M_ABS}, /* 0x8d */
- {"stx", M_ABS}, /* 0x8e */
- {"", M_NONE}, /* 0x8f */
- {"bcc", M_REL}, /* 0x90 */
- {"sta", M_INDY}, /* 0x91 */
- {"sta", M_ZIND}, /* 0x92 */ /* 65C02 */
- {"", M_NONE}, /* 0x93 */
- {"sty", M_ZPX}, /* 0x94 */
- {"sta", M_ZPX}, /* 0x95 */
- {"stx", M_ZPX}, /* 0x96 */
- {"", M_NONE}, /* 0x97 */
- {"tya", M_NONE}, /* 0x98 */
- {"sta", M_ABSY}, /* 0x99 */
- {"txs", M_NONE}, /* 0x9a */
- {"", M_NONE}, /* 0x9b */
- {"stz", M_ABS}, /* 0x9c */ /* 65C02 */
- {"sta", M_ABSX}, /* 0x9d */
- {"stz", M_ABSX}, /* 0x9e */ /* 65C02 */
- {"", M_NONE}, /* 0x9f */
- {"ldy", M_IMM}, /* 0xa0 */
- {"lda", M_INDX}, /* 0xa1 */
- {"ldx", M_IMM}, /* 0xa2 */
- {"", M_NONE}, /* 0xa3 */
- {"ldy", M_ZP}, /* 0xa4 */
- {"lda", M_ZP}, /* 0xa5 */
- {"ldx", M_ZP}, /* 0xa6 */
- {"", M_NONE}, /* 0xa7 */
- {"tay", M_NONE}, /* 0xa8 */
- {"lda", M_IMM}, /* 0xa9 */
- {"tax", M_NONE}, /* 0xaa */
- {"", M_NONE}, /* 0xab */
- {"ldy", M_ABS}, /* 0xac */
- {"lda", M_ABS}, /* 0xad */
- {"ldx", M_ABS}, /* 0xae */
- {"", M_NONE}, /* 0xaf */
- {"bcs", M_REL}, /* 0xb0 */
- {"lda", M_INDY}, /* 0xb1 */
- {"lda", M_ZIND}, /* 0xb2 */ /* 65C02 */
- {"", M_NONE}, /* 0xb3 */
- {"ldy", M_ZPX}, /* 0xb4 */
- {"lda", M_ZPX}, /* 0xb5 */
- {"ldx", M_ZPY}, /* 0xb6 */
- {"", M_NONE}, /* 0xb7 */
- {"clv", M_NONE}, /* 0xb8 */
- {"lda", M_ABSY}, /* 0xb9 */
- {"tsx", M_NONE}, /* 0xba */
- {"", M_NONE}, /* 0xbb */
- {"ldy", M_ABSX}, /* 0xbc */
- {"lda", M_ABSX}, /* 0xbd */
- {"ldx", M_ABSY}, /* 0xbe */
- {"", M_NONE}, /* 0xbf */
- {"cpy", M_IMM}, /* 0xc0 */
- {"cmp", M_INDX}, /* 0xc1 */
- {"", M_NONE}, /* 0xc2 */
- {"", M_NONE}, /* 0xc3 */
- {"cpy", M_ZP}, /* 0xc4 */
- {"cmp", M_ZP}, /* 0xc5 */
- {"dec", M_ZP}, /* 0xc6 */
- {"", M_NONE}, /* 0xc7 */
- {"iny", M_NONE}, /* 0xc8 */
- {"cmp", M_IMM}, /* 0xc9 */
- {"dex", M_NONE}, /* 0xca */
- {"", M_NONE}, /* 0xcb */
- {"cpy", M_ABS}, /* 0xcc */
- {"cmp", M_ABS}, /* 0xcd */
- {"dec", M_ABS}, /* 0xce */
- {"", M_NONE}, /* 0xcf */
- {"bne", M_REL}, /* 0xd0 */
- {"cmp", M_INDY}, /* 0xd1 */
- {"cmp", M_ZIND}, /* 0xd2 */ /* 65C02 */
- {"", M_NONE}, /* 0xd3 */
- {"", M_NONE}, /* 0xd4 */
- {"cmp", M_ZPX}, /* 0xd5 */
- {"dec", M_ZPX}, /* 0xd6 */
- {"", M_NONE}, /* 0xd7 */
- {"cld", M_NONE}, /* 0xd8 */
- {"cmp", M_ABSY}, /* 0xd9 */
- {"phx", M_NONE}, /* 0xda */ /* 65C02 */
- {"", M_NONE}, /* 0xdb */
- {"", M_NONE}, /* 0xdc */
- {"cmp", M_ABSX}, /* 0xdd */
- {"dec", M_ABSX}, /* 0xde */
- {"", M_NONE}, /* 0xdf */
- {"cpx", M_IMM}, /* 0xe0 */
- {"sbc", M_INDX}, /* 0xe1 */
- {"", M_NONE}, /* 0xe2 */
- {"", M_NONE}, /* 0xe3 */
- {"cpx", M_ZP}, /* 0xe4 */
- {"sbc", M_ZP}, /* 0xe5 */
- {"inc", M_ZP}, /* 0xe6 */
- {"", M_NONE}, /* 0xe7 */
- {"inx", M_NONE}, /* 0xe8 */
- {"sbc", M_IMM}, /* 0xe9 */
- {"nop", M_NONE}, /* 0xea */
- {"", M_NONE}, /* 0xeb */
- {"cpx", M_ABS}, /* 0xec */
- {"sbc", M_ABS}, /* 0xed */
- {"inc", M_ABS}, /* 0xee */
- {"", M_NONE}, /* 0xef */
- {"beq", M_REL}, /* 0xf0 */
- {"sbc", M_INDY}, /* 0xf1 */
- {"sbc", M_ZIND}, /* 0xf2 */ /* 65C02 */
- {"", M_NONE}, /* 0xf3 */
- {"", M_NONE}, /* 0xf4 */
- {"sbc", M_ZPX}, /* 0xf5 */
- {"inc", M_ZPX}, /* 0xf6 */
- {"", M_NONE}, /* 0xf7 */
- {"sed", M_NONE}, /* 0xf8 */
- {"sbc", M_ABSY}, /* 0xf9 */
- {"plx", M_NONE}, /* 0xfa */ /* 65C02 */
- {"", M_NONE}, /* 0xfb */
- {"", M_NONE}, /* 0xfc */
- {"sbc", M_ABSX}, /* 0xfd */
- {"inc", M_ABSX}, /* 0xfe */
- {"", M_NONE}, /* 0xff */
- };
-
-
- diss(pc, fp)
- unsigned short pc;
- FILE *fp;
- {
- char *s;
- int count;
- int tmp;
- unsigned short addr;
- unsigned char one, two, three;
-
- fprintf(fp, "%.4X: ", pc);
-
- addr = pc;
- one = mem[pc++];
- two = mem[pc++];
- three = mem[pc++];
-
- s = opcode[one].name;
-
- if (s == NULL || *s == '\0')
- s = "???";
-
- switch (opcode[one].add_mode) {
- case 0:
- fprintf(fp, "%.2x %s ", one, s);
- count = 1;
- break;
-
- case M_ZP:
- fprintf(fp, "%.2x %.2x %s $%.2x ",
- one, two, s, two);
- count = 2;
- break;
-
- case M_ZPX:
- fprintf(fp, "%.2x %.2x %s $%.2x,X ",
- one, two, s, two);
- count = 2;
- break;
-
- case M_ZPY:
- fprintf(fp, "%.2x %.2x %s $%.2x,Y ",
- one, two, s, two);
- count = 2;
- break;
-
- case M_IND:
- fprintf(fp, "%.2x %.2x %.2x %s ($%.4x) ",
- one, two, three, s,
- join(two, three));
- count = 3;
- break;
-
- case M_INDX:
- fprintf(fp, "%.2x %.2x %s ($%.2x,X) ",
- one, two, s, two);
- count = 2;
- break;
-
- case M_INDY:
- fprintf(fp, "%.2x %.2x %s ($%.2x),Y ",
- one, two, s, two);
- count = 2;
- break;
-
- case M_ABS:
- fprintf(fp, "%.2x %.2x %.2x %s $%.4x ",
- one, two, three, s,
- join(two, three));
- count = 3;
- break;
-
- case M_ABSX:
- fprintf(fp, "%.2x %.2x %.2x %s $%.4x,X ",
- one, two, three, s,
- join(two, three));
- count = 3;
- break;
-
- case M_ABSY:
- fprintf(fp, "%.2x %.2x %.2x %s $%.4x,Y ",
- one, two, three, s,
- join(two, three));
- count = 3;
- break;
-
- case M_IMM:
- fprintf(fp, "%.2x %.2x %s #$%.2x ",
- one, two, s, two);
- count = 2;
- break;
-
- case M_REL:
- tmp = two;
- if (tmp > 127)
- tmp = tmp - 256;
- tmp += addr + 2;
- tmp &= 0xFFFF;
-
- fprintf(fp, "%.2x %.2x %s $%.4x ",
- one, two, s, tmp);
- count = 2;
- break;
-
- case M_ZIND:
- fprintf(fp, "%.2x %.2x %s ($%.2x) ",
- one, two, s, two);
- count = 2;
- break;
-
- case M_ABINDX:
- fprintf(fp, "%.2x %.2x %.2x %s ($%.4x,X)",
- one, two, three, s,
- join(two, three));
- count = 3;
- break;
-
- default:
- fprintf(fp, "%.2x %s ", "???", one);
- count = 1;
- }
-
- return(count);
- }
-
- flags(fp)
- FILE *fp;
- {
- fprintf(fp, " A=%.2X X=%.2X Y=%.2X SP=%.2X", A, X, Y, Sp);
- fprintf(fp, " N%d V%d B%d D%d I%d Z%d C%d\n",
- !!N, !!V, !!B, !!D, !!I, !NZ, !!C);
- }
-
-