cpu_65c02.c

   1 #include <stdbool.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "cpu_65c02.h"
   5
   6 // initialization
   7 void cpu_65c02_init(
   8   struct cpu_65c02 *self,
   9   int (*read_byte)(void *context, int addr),
  10   void *read_byte_context,
  11   void (*write_byte)(void *context, int addr, int data),
  12   void *write_byte_context
  13 ) {
  14   memset(self, 0, sizeof(struct cpu_65c02));
  15   self->regs.byte.p = 0x30; // unused bits are hard coded to 1
  16   self->read_byte = read_byte;
  17   self->read_byte_context = read_byte_context;
  18   self->write_byte = write_byte;
  19   self->write_byte_context = write_byte_context;
  20 }
  21
  22 void cpu_65c02_reset(struct cpu_65c02 *self) {
  23   self->regs.word.pc = cpu_65c02_read_word(self, CPU_65C02_RESET_VECTOR);
  24   self->regs.byte.iflags = 0;
  25   self->regs.bit._if = true;
  26   self->regs.bit.df = false;
  27 }
  28
  29 // instruction decode
  30 void cpu_65c02_execute(struct cpu_65c02 *self) {
  31   if (self->regs.bit.stp_flag) {
  32     ++self->cycles;
  33     return;
  34   }
  35
  36   if (self->regs.bit.nmi_pending) {
  37     self->regs.bit.nmi_pending = false;
  38     self->regs.bit.wai_flag = false;
  39     cpu_65c02_irq(self, false, CPU_65C02_NMI_VECTOR);
  40     return;
  41   }
  42
  43   if (self->regs.bit.irq_pending) {
  44     if (self->regs.bit._if == 0) {
  45       self->regs.bit.irq_pending = false;
  46       self->regs.bit.wai_flag = false;
  47       cpu_65c02_irq(self, false, CPU_65C02_IRQ_VECTOR);
  48       return;
  49     }
  50     if (self->regs.bit.wai_flag) {
  51       self->regs.bit.irq_pending = false;
  52       self->regs.bit.wai_flag = false;
  53     }
  54   }
  55   else if (self->regs.bit.wai_flag) {
  56     ++self->cycles;
  57     return;
  58   }
  59
  60   switch (cpu_65c02_fetch_byte(self)) {
  61   case 0x00:
  62     ++self->regs.word.pc;
  63     cpu_65c02_irq(self, true, CPU_65C02_IRQ_VECTOR);
  64     break;
  65   case 0x01:
  66     cpu_65c02_ora(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed_indirect(self, self->regs.byte.x)));
  67     break;
  68   case 0x02:
  69     cpu_65c02_illegal_opcode22(self);
  70     break;
  71   case 0x03:
  72     cpu_65c02_illegal_opcode11(self);
  73     break;
  74   case 0x04:
  75     cpu_65c02_tsb(self, cpu_65c02_ea_zero_page(self));
  76     break;
  77   case 0x05:
  78     cpu_65c02_ora(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
  79     break;
  80   case 0x06:
  81     cpu_65c02_asl(self, cpu_65c02_ea_zero_page(self));
  82     break;
  83   case 0x07:
  84     cpu_65c02_rmb(self, 0, cpu_65c02_ea_zero_page(self));
  85     break;
  86   case 0x08:
  87     cpu_65c02_ph(self, self->regs.byte.p);
  88     break;
  89   case 0x09:
  90     cpu_65c02_ora(self, cpu_65c02_fetch_byte(self));
  91     break;
  92   case 0x0a:
  93     cpu_65c02_asl(self, CPU_65C02_EA_A);
  94     break;
  95   case 0x0b:
  96     cpu_65c02_illegal_opcode11(self);
  97     break;
  98   case 0x0c:
  99     cpu_65c02_tsb(self, cpu_65c02_ea_absolute(self));
 100     break;
 101   case 0x0d:
 102     cpu_65c02_ora(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 103     break;
 104   case 0x0e:
 105     cpu_65c02_asl(self, cpu_65c02_ea_absolute(self));
 106     break;
 107   case 0x0f:
 108     {
 109       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 110       cpu_65c02_bra(self, !(rvalue & 1), cpu_65c02_ea_relative(self));
 111     }
 112     break;
 113   case 0x10:
 114     cpu_65c02_bra(self, !self->regs.bit.nf, cpu_65c02_ea_relative(self));
 115     break;
 116   case 0x11:
 117     cpu_65c02_ora(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect_indexed(self, self->regs.byte.y)));
 118     break;
 119   case 0x12:
 120     cpu_65c02_ora(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect(self)));
 121     break;
 122   case 0x13:
 123     cpu_65c02_illegal_opcode11(self);
 124     break;
 125   case 0x14:
 126     cpu_65c02_trb(self, cpu_65c02_ea_zero_page(self));
 127     break;
 128   case 0x15:
 129     cpu_65c02_ora(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x)));
 130     break;
 131   case 0x16:
 132     cpu_65c02_asl(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x));
 133     break;
 134   case 0x17:
 135     cpu_65c02_rmb(self, 1, cpu_65c02_ea_zero_page(self));
 136     break;
 137   case 0x18:
 138     cpu_65c02_cl(self, CPU_65C02_REG_P_BIT_C);
 139     break;
 140   case 0x19:
 141     cpu_65c02_ora(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.y)));
 142     break;
 143   case 0x1a:
 144     cpu_65c02_inc(self, CPU_65C02_EA_A);
 145     break;
 146   case 0x1b:
 147     cpu_65c02_illegal_opcode11(self);
 148     break;
 149   case 0x1c:
 150     cpu_65c02_trb(self, cpu_65c02_ea_absolute(self));
 151     break;
 152   case 0x1d:
 153     cpu_65c02_ora(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x)));
 154     break;
 155   case 0x1e:
 156     cpu_65c02_asl(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x));
 157     break;
 158   case 0x1f:
 159     {
 160       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 161       cpu_65c02_bra(self, !((rvalue >> 1) & 1), cpu_65c02_ea_relative(self));
 162     }
 163     break;
 164   case 0x20:
 165     cpu_65c02_jsr(self, cpu_65c02_ea_absolute(self));
 166     break;
 167   case 0x21:
 168     cpu_65c02_and(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed_indirect(self, self->regs.byte.x)));
 169     break;
 170   case 0x22:
 171     cpu_65c02_illegal_opcode22(self);
 172     break;
 173   case 0x23:
 174     cpu_65c02_illegal_opcode11(self);
 175     break;
 176   case 0x24:
 177     cpu_65c02_bit(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 178     break;
 179   case 0x25:
 180     cpu_65c02_and(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 181     break;
 182   case 0x26:
 183     cpu_65c02_rol(self, cpu_65c02_ea_zero_page(self));
 184     break;
 185   case 0x27:
 186     cpu_65c02_rmb(self, 2, cpu_65c02_ea_zero_page(self));
 187     break;
 188   case 0x28:
 189     cpu_65c02_plp(self);
 190     break;
 191   case 0x29:
 192     cpu_65c02_and(self, cpu_65c02_fetch_byte(self));
 193     break;
 194   case 0x2a:
 195     cpu_65c02_rol(self, CPU_65C02_EA_A);
 196     break;
 197   case 0x2b:
 198     cpu_65c02_illegal_opcode11(self);
 199     break;
 200   case 0x2c:
 201     cpu_65c02_bit(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 202     break;
 203   case 0x2d:
 204     cpu_65c02_and(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 205     break;
 206   case 0x2e:
 207     cpu_65c02_rol(self, cpu_65c02_ea_absolute(self));
 208     break;
 209   case 0x2f:
 210     {
 211       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 212       cpu_65c02_bra(self, !((rvalue >> 2) & 1), cpu_65c02_ea_relative(self));
 213     }
 214     break;
 215   case 0x30:
 216     cpu_65c02_bra(self, self->regs.bit.nf, cpu_65c02_ea_relative(self));
 217     break;
 218   case 0x31:
 219     cpu_65c02_and(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect_indexed(self, self->regs.byte.y)));
 220     break;
 221   case 0x32:
 222     cpu_65c02_and(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect(self)));
 223     break;
 224   case 0x33:
 225     cpu_65c02_illegal_opcode11(self);
 226     break;
 227   case 0x34:
 228     cpu_65c02_bit(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x)));
 229     break;
 230   case 0x35:
 231     cpu_65c02_and(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x)));
 232     break;
 233   case 0x36:
 234     cpu_65c02_rol(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x));
 235     break;
 236   case 0x37:
 237     cpu_65c02_rmb(self, 3, cpu_65c02_ea_zero_page(self));
 238     break;
 239   case 0x38:
 240     cpu_65c02_se(self, CPU_65C02_REG_P_BIT_C);
 241     break;
 242   case 0x39:
 243     cpu_65c02_and(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.y)));
 244     break;
 245   case 0x3a:
 246     cpu_65c02_dec(self, CPU_65C02_EA_A);
 247     break;
 248   case 0x3b:
 249     cpu_65c02_illegal_opcode11(self);
 250     break;
 251   case 0x3c:
 252     cpu_65c02_bit(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x)));
 253     break;
 254   case 0x3d:
 255     cpu_65c02_and(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x)));
 256     break;
 257   case 0x3e:
 258     cpu_65c02_rol(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x));
 259     break;
 260   case 0x3f:
 261     {
 262       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 263       cpu_65c02_bra(self, !((rvalue >> 3) & 1), cpu_65c02_ea_relative(self));
 264     }
 265     break;
 266   case 0x40:
 267     cpu_65c02_rti(self);
 268     break;
 269   case 0x41:
 270     cpu_65c02_eor(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed_indirect(self, self->regs.byte.x)));
 271     break;
 272   case 0x42:
 273     cpu_65c02_illegal_opcode22(self);
 274     break;
 275   case 0x43:
 276     cpu_65c02_illegal_opcode11(self);
 277     break;
 278   case 0x44:
 279     cpu_65c02_illegal_opcode23(self);
 280     break;
 281   case 0x45:
 282     cpu_65c02_eor(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 283     break;
 284   case 0x46:
 285     cpu_65c02_lsr(self, cpu_65c02_ea_zero_page(self));
 286     break;
 287   case 0x47:
 288     cpu_65c02_rmb(self, 4, cpu_65c02_ea_zero_page(self));
 289     break;
 290   case 0x48:
 291     cpu_65c02_ph(self, self->regs.byte.a);
 292     break;
 293   case 0x49:
 294     cpu_65c02_eor(self, cpu_65c02_fetch_byte(self));
 295     break;
 296   case 0x4a:
 297     cpu_65c02_lsr(self, CPU_65C02_EA_A);
 298     break;
 299   case 0x4b:
 300     cpu_65c02_illegal_opcode11(self);
 301     break;
 302   case 0x4c:
 303     cpu_65c02_jmp(self, cpu_65c02_ea_absolute(self));
 304     break;
 305   case 0x4d:
 306     cpu_65c02_eor(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 307     break;
 308   case 0x4e:
 309     cpu_65c02_lsr(self, cpu_65c02_ea_absolute(self));
 310     break;
 311   case 0x4f:
 312     {
 313       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 314       cpu_65c02_bra(self, !((rvalue >> 4) & 1), cpu_65c02_ea_relative(self));
 315     }
 316     break;
 317   case 0x50:
 318     cpu_65c02_bra(self, !self->regs.bit.vf, cpu_65c02_ea_relative(self));
 319     break;
 320   case 0x51:
 321     cpu_65c02_eor(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect_indexed(self, self->regs.byte.y)));
 322     break;
 323   case 0x52:
 324     cpu_65c02_eor(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect(self)));
 325     break;
 326   case 0x53:
 327     cpu_65c02_illegal_opcode11(self);
 328     break;
 329   case 0x54:
 330     cpu_65c02_illegal_opcode24(self);
 331     break;
 332   case 0x55:
 333     cpu_65c02_eor(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x)));
 334     break;
 335   case 0x56:
 336     cpu_65c02_lsr(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x));
 337     break;
 338   case 0x57:
 339     cpu_65c02_rmb(self, 5, cpu_65c02_ea_zero_page(self));
 340     break;
 341   case 0x58:
 342     cpu_65c02_cl(self, CPU_65C02_REG_P_BIT_I);
 343     break;
 344   case 0x59:
 345     cpu_65c02_eor(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.y)));
 346     break;
 347   case 0x5a:
 348     cpu_65c02_ph(self, self->regs.byte.y);
 349     break;
 350   case 0x5b:
 351     cpu_65c02_illegal_opcode11(self);
 352     break;
 353   case 0x5c:
 354     cpu_65c02_illegal_opcode38(self);
 355     break;
 356   case 0x5d:
 357     cpu_65c02_eor(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x)));
 358     break;
 359   case 0x5e:
 360     cpu_65c02_lsr(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x));
 361     break;
 362   case 0x5f:
 363     {
 364       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 365       cpu_65c02_bra(self, !((rvalue >> 5) & 1), cpu_65c02_ea_relative(self));
 366     }
 367     break;
 368   case 0x60:
 369     cpu_65c02_rts(self);
 370     break;
 371   case 0x61:
 372     cpu_65c02_adc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed_indirect(self, self->regs.byte.x)));
 373     break;
 374   case 0x62:
 375     cpu_65c02_illegal_opcode22(self);
 376     break;
 377   case 0x63:
 378     cpu_65c02_illegal_opcode11(self);
 379     break;
 380   case 0x64:
 381     cpu_65c02_st(self, 0, cpu_65c02_ea_zero_page(self));
 382     break;
 383   case 0x65:
 384     cpu_65c02_adc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 385     break;
 386   case 0x66:
 387     cpu_65c02_ror(self, cpu_65c02_ea_zero_page(self));
 388     break;
 389   case 0x67:
 390     cpu_65c02_rmb(self, 6, cpu_65c02_ea_zero_page(self));
 391     break;
 392   case 0x68:
 393     cpu_65c02_pl(self, CPU_65C02_EA_A);
 394     break;
 395   case 0x69:
 396     cpu_65c02_adc(self, cpu_65c02_fetch_byte(self));
 397     break;
 398   case 0x6a:
 399     cpu_65c02_ror(self, CPU_65C02_EA_A);
 400     break;
 401   case 0x6b:
 402     cpu_65c02_illegal_opcode11(self);
 403     break;
 404   case 0x6c:
 405     cpu_65c02_jmp(self, cpu_65c02_ea_absolute_indirect(self));
 406     break;
 407   case 0x6d:
 408     cpu_65c02_adc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 409     break;
 410   case 0x6e:
 411     cpu_65c02_ror(self, cpu_65c02_ea_absolute(self));
 412     break;
 413   case 0x6f:
 414     {
 415       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 416       cpu_65c02_bra(self, !((rvalue >> 6) & 1), cpu_65c02_ea_relative(self));
 417     }
 418     break;
 419   case 0x70:
 420     cpu_65c02_bra(self, self->regs.bit.vf, cpu_65c02_ea_relative(self));
 421     break;
 422   case 0x71:
 423     cpu_65c02_adc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect_indexed(self, self->regs.byte.y)));
 424     break;
 425   case 0x72:
 426     cpu_65c02_adc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect(self)));
 427     break;
 428   case 0x73:
 429     cpu_65c02_illegal_opcode11(self);
 430     break;
 431   case 0x74:
 432     cpu_65c02_st(self, 0, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x));
 433     break;
 434   case 0x75:
 435     cpu_65c02_adc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x)));
 436     break;
 437   case 0x76:
 438     cpu_65c02_ror(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x));
 439     break;
 440   case 0x77:
 441     cpu_65c02_rmb(self, 7, cpu_65c02_ea_zero_page(self));
 442     break;
 443   case 0x78:
 444     cpu_65c02_se(self, CPU_65C02_REG_P_BIT_I);
 445     break;
 446   case 0x79:
 447     cpu_65c02_adc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.y)));
 448     break;
 449   case 0x7a:
 450     cpu_65c02_pl(self, CPU_65C02_EA_Y);
 451     break;
 452   case 0x7b:
 453     cpu_65c02_illegal_opcode11(self);
 454     break;
 455   case 0x7c:
 456     cpu_65c02_jmp(self, cpu_65c02_ea_absolute_indexed_indirect(self, self->regs.byte.x));
 457     break;
 458   case 0x7d:
 459     cpu_65c02_adc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x)));
 460     break;
 461   case 0x7e:
 462     cpu_65c02_ror(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x));
 463     break;
 464   case 0x7f:
 465     {
 466       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 467       cpu_65c02_bra(self, !((rvalue >> 7) & 1), cpu_65c02_ea_relative(self));
 468     }
 469     break;
 470   case 0x80:
 471     cpu_65c02_bra(self, true, cpu_65c02_ea_relative(self));
 472     break;
 473   case 0x81:
 474     cpu_65c02_st(self, self->regs.byte.a, cpu_65c02_ea_zero_page_indexed_indirect(self, self->regs.byte.x));
 475     break;
 476   case 0x82:
 477     cpu_65c02_illegal_opcode22(self);
 478     break;
 479   case 0x83:
 480     cpu_65c02_illegal_opcode11(self);
 481     break;
 482   case 0x84:
 483     cpu_65c02_st(self, self->regs.byte.y, cpu_65c02_ea_zero_page(self));
 484     break;
 485   case 0x85:
 486     cpu_65c02_st(self, self->regs.byte.a, cpu_65c02_ea_zero_page(self));
 487     break;
 488   case 0x86:
 489     cpu_65c02_st(self, self->regs.byte.x, cpu_65c02_ea_zero_page(self));
 490     break;
 491   case 0x87:
 492     cpu_65c02_smb(self, 0, cpu_65c02_ea_zero_page(self));
 493     break;
 494   case 0x88:
 495     cpu_65c02_dec(self, CPU_65C02_EA_Y);
 496     break;
 497   case 0x89:
 498     cpu_65c02_bit_imm(self, cpu_65c02_fetch_byte(self));
 499     break;
 500   case 0x8a:
 501     cpu_65c02_ld(self, CPU_65C02_EA_A, self->regs.byte.x);
 502     break;
 503   case 0x8b:
 504     cpu_65c02_illegal_opcode11(self);
 505     break;
 506   case 0x8c:
 507     cpu_65c02_st(self, self->regs.byte.y, cpu_65c02_ea_absolute(self));
 508     break;
 509   case 0x8d:
 510     cpu_65c02_st(self, self->regs.byte.a, cpu_65c02_ea_absolute(self));
 511     break;
 512   case 0x8e:
 513     cpu_65c02_st(self, self->regs.byte.x, cpu_65c02_ea_absolute(self));
 514     break;
 515   case 0x8f:
 516     {
 517       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 518       cpu_65c02_bra(self, rvalue & 1, cpu_65c02_ea_relative(self));
 519     }
 520     break;
 521   case 0x90:
 522     cpu_65c02_bra(self, !self->regs.bit.cf, cpu_65c02_ea_relative(self));
 523     break;
 524   case 0x91:
 525     cpu_65c02_st(self, self->regs.byte.a, cpu_65c02_ea_zero_page_indirect_indexed(self, self->regs.byte.y));
 526     break;
 527   case 0x92:
 528     cpu_65c02_st(self, self->regs.byte.a, cpu_65c02_ea_zero_page_indirect(self));
 529     break;
 530   case 0x93:
 531     cpu_65c02_illegal_opcode11(self);
 532     break;
 533   case 0x94:
 534     cpu_65c02_st(self, self->regs.byte.y, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x));
 535     break;
 536   case 0x95:
 537     cpu_65c02_st(self, self->regs.byte.a, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x));
 538     break;
 539   case 0x96:
 540     cpu_65c02_st(self, self->regs.byte.x, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.y));
 541     break;
 542   case 0x97:
 543     cpu_65c02_smb(self, 1, cpu_65c02_ea_zero_page(self));
 544     break;
 545   case 0x98:
 546     cpu_65c02_ld(self, CPU_65C02_EA_A, self->regs.byte.y);
 547     break;
 548   case 0x99:
 549     cpu_65c02_st(self, self->regs.byte.a, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.y));
 550     break;
 551   case 0x9a:
 552     cpu_65c02_st(self, self->regs.byte.x, CPU_65C02_EA_S);
 553     break;
 554   case 0x9b:
 555     cpu_65c02_illegal_opcode11(self);
 556     break;
 557   case 0x9c:
 558     cpu_65c02_st(self, 0, cpu_65c02_ea_absolute(self));
 559     break;
 560   case 0x9d:
 561     cpu_65c02_st(self, self->regs.byte.a, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x));
 562     break;
 563   case 0x9e:
 564     cpu_65c02_st(self, 0, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x));
 565     break;
 566   case 0x9f:
 567     {
 568       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 569       cpu_65c02_bra(self, (rvalue >> 1) & 1, cpu_65c02_ea_relative(self));
 570     }
 571     break;
 572   case 0xa0:
 573     cpu_65c02_ld(self, CPU_65C02_EA_Y, cpu_65c02_fetch_byte(self));
 574     break;
 575   case 0xa1:
 576     cpu_65c02_ld(self, CPU_65C02_EA_A, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed_indirect(self, self->regs.byte.x)));
 577     break;
 578   case 0xa2:
 579     cpu_65c02_ld(self, CPU_65C02_EA_X, cpu_65c02_fetch_byte(self));
 580     break;
 581   case 0xa3:
 582     cpu_65c02_illegal_opcode11(self);
 583     break;
 584   case 0xa4:
 585     cpu_65c02_ld(self, CPU_65C02_EA_Y, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 586     break;
 587   case 0xa5:
 588     cpu_65c02_ld(self, CPU_65C02_EA_A, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 589     break;
 590   case 0xa6:
 591     cpu_65c02_ld(self, CPU_65C02_EA_X, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 592     break;
 593   case 0xa7:
 594     cpu_65c02_smb(self, 2, cpu_65c02_ea_zero_page(self));
 595     break;
 596   case 0xa8:
 597     cpu_65c02_ld(self, CPU_65C02_EA_Y, self->regs.byte.a);
 598     break;
 599   case 0xa9:
 600     cpu_65c02_ld(self, CPU_65C02_EA_A, cpu_65c02_fetch_byte(self));
 601     break;
 602   case 0xaa:
 603     cpu_65c02_ld(self, CPU_65C02_EA_X, self->regs.byte.a);
 604     break;
 605   case 0xab:
 606     cpu_65c02_illegal_opcode11(self);
 607     break;
 608   case 0xac:
 609     cpu_65c02_ld(self, CPU_65C02_EA_Y, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 610     break;
 611   case 0xad:
 612     cpu_65c02_ld(self, CPU_65C02_EA_A, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 613     break;
 614   case 0xae:
 615     cpu_65c02_ld(self, CPU_65C02_EA_X, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 616     break;
 617   case 0xaf:
 618     {
 619       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 620       cpu_65c02_bra(self, (rvalue >> 2) & 1, cpu_65c02_ea_relative(self));
 621     }
 622     break;
 623   case 0xb0:
 624     cpu_65c02_bra(self, self->regs.bit.cf, cpu_65c02_ea_relative(self));
 625     break;
 626   case 0xb1:
 627     cpu_65c02_ld(self, CPU_65C02_EA_A, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect_indexed(self, self->regs.byte.y)));
 628     break;
 629   case 0xb2:
 630     cpu_65c02_ld(self, CPU_65C02_EA_A, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect(self)));
 631     break;
 632   case 0xb3:
 633     cpu_65c02_illegal_opcode11(self);
 634     break;
 635   case 0xb4:
 636     cpu_65c02_ld(self, CPU_65C02_EA_Y, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x)));
 637     break;
 638   case 0xb5:
 639     cpu_65c02_ld(self, CPU_65C02_EA_A, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x)));
 640     break;
 641   case 0xb6:
 642     cpu_65c02_ld(self, CPU_65C02_EA_X, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.y)));
 643     break;
 644   case 0xb7:
 645     cpu_65c02_smb(self, 3, cpu_65c02_ea_zero_page(self));
 646     break;
 647   case 0xb8:
 648     cpu_65c02_cl(self, CPU_65C02_REG_P_BIT_V);
 649     break;
 650   case 0xb9:
 651     cpu_65c02_ld(self, CPU_65C02_EA_A, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.y)));
 652     break;
 653   case 0xba:
 654     cpu_65c02_ld(self, CPU_65C02_EA_X, self->regs.byte.s);
 655     break;
 656   case 0xbb:
 657     cpu_65c02_illegal_opcode11(self);
 658     break;
 659   case 0xbc:
 660     cpu_65c02_ld(self, CPU_65C02_EA_Y, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x)));
 661     break;
 662   case 0xbd:
 663     cpu_65c02_ld(self, CPU_65C02_EA_A, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x)));
 664     break;
 665   case 0xbe:
 666     cpu_65c02_ld(self, CPU_65C02_EA_X, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.y)));
 667     break;
 668   case 0xbf:
 669     {
 670       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 671       cpu_65c02_bra(self, (rvalue >> 3) & 1, cpu_65c02_ea_relative(self));
 672     }
 673     break;
 674   case 0xc0:
 675     cpu_65c02_cmp(self, self->regs.byte.y, cpu_65c02_fetch_byte(self));
 676     break;
 677   case 0xc1:
 678     cpu_65c02_cmp(self, self->regs.byte.a, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed_indirect(self, self->regs.byte.x)));
 679     break;
 680   case 0xc2:
 681     cpu_65c02_illegal_opcode22(self);
 682     break;
 683   case 0xc3:
 684     cpu_65c02_illegal_opcode11(self);
 685     break;
 686   case 0xc4:
 687     cpu_65c02_cmp(self, self->regs.byte.y, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 688     break;
 689   case 0xc5:
 690     cpu_65c02_cmp(self, self->regs.byte.a, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 691     break;
 692   case 0xc6:
 693     cpu_65c02_dec(self, cpu_65c02_ea_zero_page(self));
 694     break;
 695   case 0xc7:
 696     cpu_65c02_smb(self, 4, cpu_65c02_ea_zero_page(self));
 697     break;
 698   case 0xc8:
 699     cpu_65c02_inc(self, CPU_65C02_EA_Y);
 700     break;
 701   case 0xc9:
 702     cpu_65c02_cmp(self, self->regs.byte.a, cpu_65c02_fetch_byte(self));
 703     break;
 704   case 0xca:
 705     cpu_65c02_dec(self, CPU_65C02_EA_X);
 706     break;
 707   case 0xcb:
 708     cpu_65c02_wai(self);
 709     break;
 710   case 0xcc:
 711     cpu_65c02_cmp(self, self->regs.byte.y, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 712     break;
 713   case 0xcd:
 714     cpu_65c02_cmp(self, self->regs.byte.a, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 715     break;
 716   case 0xce:
 717     cpu_65c02_dec(self, cpu_65c02_ea_absolute(self));
 718     break;
 719   case 0xcf:
 720     {
 721       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 722       cpu_65c02_bra(self, (rvalue >> 4) & 1, cpu_65c02_ea_relative(self));
 723     }
 724     break;
 725   case 0xd0:
 726     cpu_65c02_bra(self, !self->regs.bit.zf, cpu_65c02_ea_relative(self));
 727     break;
 728   case 0xd1:
 729     cpu_65c02_cmp(self, self->regs.byte.a, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect_indexed(self, self->regs.byte.y)));
 730     break;
 731   case 0xd2:
 732     cpu_65c02_cmp(self, self->regs.byte.a, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect(self)));
 733     break;
 734   case 0xd3:
 735     cpu_65c02_illegal_opcode11(self);
 736     break;
 737   case 0xd4:
 738     cpu_65c02_illegal_opcode24(self);
 739     break;
 740   case 0xd5:
 741     cpu_65c02_cmp(self, self->regs.byte.a, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x)));
 742     break;
 743   case 0xd6:
 744     cpu_65c02_dec(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x));
 745     break;
 746   case 0xd7:
 747     cpu_65c02_smb(self, 5, cpu_65c02_ea_zero_page(self));
 748     break;
 749   case 0xd8:
 750     cpu_65c02_cl(self, CPU_65C02_REG_P_BIT_D);
 751     break;
 752   case 0xd9:
 753     cpu_65c02_cmp(self, self->regs.byte.a, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.y)));
 754     break;
 755   case 0xda:
 756     cpu_65c02_ph(self, self->regs.byte.x);
 757     break;
 758   case 0xdb:
 759     cpu_65c02_illegal_opcode11(self);
 760     break;
 761   case 0xdc:
 762     cpu_65c02_illegal_opcode34(self);
 763     break;
 764   case 0xdd:
 765     cpu_65c02_cmp(self, self->regs.byte.a, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x)));
 766     break;
 767   case 0xde:
 768     cpu_65c02_dec(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x));
 769     break;
 770   case 0xdf:
 771     {
 772       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 773       cpu_65c02_bra(self, (rvalue >> 5) & 1, cpu_65c02_ea_relative(self));
 774     }
 775     break;
 776   case 0xe0:
 777     cpu_65c02_cmp(self, self->regs.byte.x, cpu_65c02_fetch_byte(self));
 778     break;
 779   case 0xe1:
 780     cpu_65c02_sbc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed_indirect(self, self->regs.byte.x)));
 781     break;
 782   case 0xe2:
 783     cpu_65c02_illegal_opcode22(self);
 784     break;
 785   case 0xe3:
 786     cpu_65c02_illegal_opcode11(self);
 787     break;
 788   case 0xe4:
 789     cpu_65c02_cmp(self, self->regs.byte.x, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 790     break;
 791   case 0xe5:
 792     cpu_65c02_sbc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self)));
 793     break;
 794   case 0xe6:
 795     cpu_65c02_inc(self, cpu_65c02_ea_zero_page(self));
 796     break;
 797   case 0xe7:
 798     cpu_65c02_smb(self, 6, cpu_65c02_ea_zero_page(self));
 799     break;
 800   case 0xe8:
 801     cpu_65c02_inc(self, CPU_65C02_EA_X);
 802     break;
 803   case 0xe9:
 804     cpu_65c02_sbc(self, cpu_65c02_fetch_byte(self));
 805     break;
 806   case 0xea:
 807     cpu_65c02_nop(self);
 808     break;
 809   case 0xeb:
 810     cpu_65c02_illegal_opcode11(self);
 811     break;
 812   case 0xec:
 813     cpu_65c02_cmp(self, self->regs.byte.x, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 814     break;
 815   case 0xed:
 816     cpu_65c02_sbc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute(self)));
 817     break;
 818   case 0xee:
 819     cpu_65c02_inc(self, cpu_65c02_ea_absolute(self));
 820     break;
 821   case 0xef:
 822     {
 823       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 824       cpu_65c02_bra(self, (rvalue >> 6) & 1, cpu_65c02_ea_relative(self));
 825     }
 826     break;
 827   case 0xf0:
 828     cpu_65c02_bra(self, self->regs.bit.zf, cpu_65c02_ea_relative(self));
 829     break;
 830   case 0xf1:
 831     cpu_65c02_sbc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect_indexed(self, self->regs.byte.y)));
 832     break;
 833   case 0xf2:
 834     cpu_65c02_sbc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indirect(self)));
 835     break;
 836   case 0xf3:
 837     cpu_65c02_illegal_opcode11(self);
 838     break;
 839   case 0xf4:
 840     cpu_65c02_illegal_opcode24(self);
 841     break;
 842   case 0xf5:
 843     cpu_65c02_sbc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x)));
 844     break;
 845   case 0xf6:
 846     cpu_65c02_inc(self, cpu_65c02_ea_zero_page_indexed(self, self->regs.byte.x));
 847     break;
 848   case 0xf7:
 849     cpu_65c02_smb(self, 7, cpu_65c02_ea_zero_page(self));
 850     break;
 851   case 0xf8:
 852     cpu_65c02_se(self, CPU_65C02_REG_P_BIT_D);
 853     break;
 854   case 0xf9:
 855     cpu_65c02_sbc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.y)));
 856     break;
 857   case 0xfa:
 858     cpu_65c02_pl(self, CPU_65C02_EA_X);
 859     break;
 860   case 0xfb:
 861     cpu_65c02_illegal_opcode11(self);
 862     break;
 863   case 0xfc:
 864     cpu_65c02_illegal_opcode34(self);
 865     break;
 866   case 0xfd:
 867     cpu_65c02_sbc(self, cpu_65c02_read_byte(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x)));
 868     break;
 869   case 0xfe:
 870     cpu_65c02_inc(self, cpu_65c02_ea_absolute_indexed(self, self->regs.byte.x));
 871     break;
 872   case 0xff:
 873     {
 874       int rvalue = cpu_65c02_read_byte(self, cpu_65c02_ea_zero_page(self));
 875       cpu_65c02_bra(self, (rvalue >> 7) & 1, cpu_65c02_ea_relative(self));
 876     }
 877     break;
 878   }
 879 }