static const int adr_a_begin[]={ -1, -1, BEGIN_XS, BEGIN_X, BEGIN_S, BEGIN_M, BEGIN_B, BEGIN_W, -1, -1, -1, -1, -1, -1, -1, -1, }; static const int adr_a_count[]={ -1, -1, COUNT_XS, COUNT_X, COUNT_S, COUNT_M, COUNT_B, COUNT_W, -1, -1, -1, -1, -1, -1, -1, -1, }; static const int adr_b_begin[]={ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, BEGIN_XS, BEGIN_X, BEGIN_S, BEGIN_M, BEGIN_B, BEGIN_W, }; static const int adr_b_count[]={ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, COUNT_XS, COUNT_X, COUNT_S, COUNT_M, COUNT_B, COUNT_W, }; static const int adr_af_begin[]={ -1, -1, BEGIN_XS, BEGIN_X, BEGIN_S, BEGIN_M, BEGIN_B, BEGIN_W, -1, -1, -1, -1, -1, -1, -1, BEGIN_A }; static const int adr_af_count[]={ -1, -1, COUNT_XS, COUNT_X, COUNT_S, COUNT_M, COUNT_B, COUNT_W, -1, -1, -1, -1, -1, -1, -1, COUNT_A }; static const int reg_left[] ={A,B,C,D, B,C,A,C, I,I,I,I, I,I,I,I}; static const int reg_right[]={B,C,A,C, A,B,C,D, I,I,I,I, I,I,I,I}; static const int add_left[] ={A,B,C,D, I,I,I,I, B,C,A,C, I,I,I,I}; static const int add_right[]={B,C,A,C, I,I,I,I, A,B,C,D, I,I,I,I}; static const int sub_left[] ={A,B,C,D, I,I,I,I, B,C,A,C, A,B,C,D}; static const int sub_right[]={B,C,A,C, I,I,I,I, A,B,C,D, B,C,A,C}; void saturn_invalid3( int op1, int op2, int op3 ) { logerror( "SATURN#%d invalid opcode %x%x%x at %05x\n", cpu_getactivecpu(), op1, op2, op3, saturn.pc-3 ); } void saturn_invalid4( int op1, int op2, int op3, int op4 ) { logerror( "SATURN#%d invalid opcode %x%x%x%x at %05x\n", cpu_getactivecpu(), op1, op2, op3, op4, saturn.pc-4 ); } void saturn_invalid5( int op1, int op2, int op3, int op4, int op5 ) { logerror( "SATURN#%d invalid opcode %x%x%x%x%x at %05x\n", cpu_getactivecpu(), op1, op2, op3, op4, op5, saturn.pc-5 ); } void saturn_invalid6( int op1, int op2, int op3, int op4, int op5, int op6 ) { logerror( "SATURN#%d invalid opcode %x%x%x%x%x%x at %05x\n", cpu_getactivecpu(), op1, op2, op3, op4, op5, op6, saturn.pc-6 ); } INLINE void saturn_instruction_0e(void) { int reg, adr; switch(adr=READ_OP()) { case 0: switch(reg=READ_OP()){ case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: saturn_and(reg_left[reg], saturn.p, 1, reg_right[reg]); break; //A=A&B p case 8: case 9: case 0xa: case 0xb: case 0xc: case 0xd: case 0xe: case 0xf: saturn_or(reg_left[reg&7], saturn.p, 1, reg_right[reg&7]); break; //A=A!B p } break; case 1: switch(reg=READ_OP()){ case 0: case 1: case 2: case 3:case 4: case 5: case 6: case 7: saturn_and(reg_left[reg], 0, saturn.p+1, reg_right[reg]); break; //A=A&B wp case 8: case 9: case 0xa: case 0xb: case 0xc: case 0xd: case 0xe: case 0xf: saturn_or(reg_left[reg&7], 0, saturn.p+1, reg_right[reg&7]); break; //A=A!B wp } break; case 2: case 3: case 4: case 5: case 6: case 7: case 0xf: switch(reg=READ_OP()){ case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: saturn_and(reg_left[reg], adr_af_begin[adr], adr_af_count[adr], reg_right[reg]); break; //A=A&B xs case 8: case 9: case 0xa: case 0xb: case 0xc: case 0xd: case 0xe: case 0xf: saturn_or(reg_left[reg&7], adr_af_begin[adr], adr_af_count[adr], reg_right[reg&7]); break; //A=A!B xs } break; default: saturn_invalid3( 0, 0xe, adr ); break; } } static void saturn_instruction_1(void) { int reg, adr, oper; switch (adr=READ_OP()) { case 0: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_copy(R0+reg, BEGIN_W, COUNT_W, A); break; // r0=a w case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_copy(R0+(reg&7), BEGIN_W, COUNT_W, C); break; // r0=c w default: saturn_invalid3( 1, adr, reg ); break; } break; case 1: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_copy(A, BEGIN_W, COUNT_W, R0+reg); break; // a=r0 w case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_copy(C, BEGIN_W, COUNT_W, R0+(reg&7)); break; // c=r0 w default: saturn_invalid3( 1, adr, reg ); break; } break; case 2: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_exchange(A, BEGIN_W, COUNT_W, R0+reg); break; // ar0ex w case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_exchange(C, BEGIN_W, COUNT_W, R0+(reg&7)); break; // cr0ex w default: saturn_invalid3( 2, adr, reg ); break; } break; case 3: switch (READ_OP()) { case 0: saturn_reg_to_adr(A,0);break; case 1: saturn_reg_to_adr(A,1);break; case 2: saturn_exchange_adr_reg(0,A);break; case 3: saturn_exchange_adr_reg(1,A);break; case 4: saturn_reg_to_adr(C,0);break; case 5: saturn_reg_to_adr(C,1);break; case 6: saturn_exchange_adr_reg(0,C);break; case 7: saturn_exchange_adr_reg(1,C);break; case 8: saturn_reg_to_adr_word(A,0);break; case 9: saturn_reg_to_adr_word(A,1);break; case 0xa: saturn_exchange_adr_reg_word(0,A);break; case 0xb: saturn_exchange_adr_reg_word(1,A);break; case 0xc: saturn_reg_to_adr_word(C,0);break; case 0xd: saturn_reg_to_adr_word(C,1);break; case 0xe: saturn_exchange_adr_reg_word(0,C);break; case 0xf: saturn_exchange_adr_reg_word(1,C);break; } break; case 4: switch (READ_OP()) { case 0: saturn_store_nibbles(A, BEGIN_A, COUNT_A, 0); break; case 1: saturn_store_nibbles(A, BEGIN_A, COUNT_A, 1); break; case 2: saturn_load_nibbles(A, BEGIN_A, COUNT_A, 0); break; case 3: saturn_load_nibbles(A, BEGIN_A, COUNT_A, 1); break; case 4: saturn_store_nibbles(C, BEGIN_A, COUNT_A, 0); break; case 5: saturn_store_nibbles(C, BEGIN_A, COUNT_A, 1); break; case 6: saturn_load_nibbles(C, BEGIN_A, COUNT_A, 0); break; case 7: saturn_load_nibbles(C, BEGIN_A, COUNT_A, 1); break; case 8: saturn_store_nibbles(A, BEGIN_B, COUNT_B, 0); break; case 9: saturn_store_nibbles(A, BEGIN_B, COUNT_B, 1); break; case 0xa: saturn_load_nibbles(A, BEGIN_B, COUNT_B, 0); break; case 0xb: saturn_load_nibbles(A, BEGIN_B, COUNT_B, 1); break; case 0xc: saturn_store_nibbles(C, BEGIN_B, COUNT_B, 0); break; case 0xd: saturn_store_nibbles(C, BEGIN_B, COUNT_B, 1); break; case 0xe: saturn_load_nibbles(C, BEGIN_B, COUNT_B, 0); break; case 0xf: saturn_load_nibbles(C, BEGIN_B, COUNT_B, 1); break; } break; case 5: switch (oper=READ_OP()) { case 0: case 1: case 4: case 5: switch (adr=READ_OP()) { case 0: saturn_store_nibbles(oper&4?C:A,saturn.p,1,oper&1); break; case 1: saturn_store_nibbles(oper&4?C:A,0,saturn.p+1,oper&1); break; case 2: case 3: case 4: case 5: case 6: case 7: saturn_store_nibbles(oper&4?C:A,adr_a_begin[adr],adr_a_count[adr],oper&1); break; default: saturn_invalid4( 1, 5, oper, adr ); break; } break; case 2: case 3: case 6: case 7: switch (adr=READ_OP()) { case 0: saturn_load_nibbles(oper&4?C:A,saturn.p,1,oper&1); break; case 1: saturn_load_nibbles(oper&4?C:A,0,saturn.p+1,oper&1); break; case 2: case 3: case 4: case 5: case 6: case 7: saturn_load_nibbles(oper&4?C:A,adr_a_begin[adr],adr_a_count[adr],oper&1); break; default: saturn_invalid4( 1, 5, oper, adr ); break; } break; case 8: saturn_store_nibbles(A, 0, READ_OP()+1, 0); break; case 9: saturn_store_nibbles(A, 0, READ_OP()+1, 1); break; case 0xa: saturn_load_nibbles(A, 0, READ_OP()+1, 0); break; case 0xb: saturn_load_nibbles(A, 0, READ_OP()+1, 1); break; case 0xc: saturn_store_nibbles(C, 0, READ_OP()+1, 0); break; case 0xd: saturn_store_nibbles(C, 0, READ_OP()+1, 1); break; case 0xe: saturn_load_nibbles(C, 0, READ_OP()+1, 0); break; case 0xf: saturn_load_nibbles(C, 0, READ_OP()+1, 1); break; } break; case 6: saturn_add_adr(0);break; case 7: saturn_add_adr(1);break; case 8: saturn_sub_adr(0);break; case 9: saturn_load_adr(0,2);break; case 0xa: saturn_load_adr(0,4);break; case 0xb: saturn_load_adr(0,5);break; case 0xc: saturn_sub_adr(1);break; case 0xd: saturn_load_adr(1,2);break; case 0xe: saturn_load_adr(1,4);break; case 0xf: saturn_load_adr(1,5);break; } } static void saturn_instruction_80(void) { int op; switch(READ_OP()) { case 0: saturn_out_cs();break; case 1: saturn_out_c();break; case 2: saturn_in(A);break; case 3: saturn_in(C);break; case 4: saturn_mem_unconfig();break; case 5: saturn_mem_config();break; case 6: saturn_mem_id();break; case 7: saturn_shutdown();break; case 8: switch(READ_OP()) { case 0: saturn_interrupt_on();break; case 1: switch(op=READ_OP()) { case 0: saturn_reset_interrupt();break; default: saturn_invalid5( 8, 0, 8, 1, op ); break; } break; case 2: saturn_load_reg(A);break; //la case 3: saturn_bus_command_b();break; case 4: saturn_clear_bit(A);break; // abit=0 case 5: saturn_set_bit(A);break; // abit=1 case 6: saturn_jump_bit_clear(A);break; case 7: saturn_jump_bit_set(A);break; case 8: saturn_clear_bit(C);break; // cbit=0 case 9: saturn_set_bit(C);break; // cbit=1 case 0xa: saturn_jump_bit_clear(C);break; case 0xb: saturn_jump_bit_set(C);break; case 0xc: saturn_indirect_jump(A);break; case 0xd: saturn_bus_command_d();break; case 0xe: saturn_indirect_jump(C);break; case 0xf: saturn_interrupt_off();break; } break; case 9: saturn_ca_p_1();break;//C+P+1 case 0xa: saturn_mem_reset();break; case 0xb: saturn_bus_command_b();break; case 0xc: saturn_p_to_c();break; case 0xd: saturn_c_to_p();break; case 0xe: saturn_serial_request();break; case 0xf: saturn_exchange_p();break; } } static void saturn_instruction_81a(void) { int reg, adr,op; switch(adr=READ_OP()) { case 0: switch(op=READ_OP()) { case 0: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_copy(R0+reg,saturn.p,1,A); break; //r0=a p case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_copy(R0+(reg&7),saturn.p,1,C); break; //r0=c p default: saturn_invalid6( 8, 1, 0xa, adr, op, reg); break; } break; case 1: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_copy(A,saturn.p,1,R0+reg); break; //a=r0 p case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_copy(C,saturn.p,1,R0+(reg&7)); break; //c=r0 p default: saturn_invalid6( 8, 1, 0xa, adr, op, reg); break; } break; case 2: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_exchange(A, saturn.p,1,R0+reg); break; // ar0ex p case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_exchange(C, saturn.p,1,R0+(reg&7)); break; // cr0ex p default: saturn_invalid6( 8, 1, 0xa, adr, op, reg); break; } break; default: saturn_invalid5( 8, 1, 0xa, adr, op ); break; } break; case 1: switch(op=READ_OP()) { case 0: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_copy(R0+reg,0,saturn.p+1,A); break; //r0=a wp case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_copy(R0+(reg&7),0,saturn.p+1,C); break; //r0=c wp default: saturn_invalid6( 8, 1, 0xa, adr, op, reg); break; } break; case 1: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_copy(A,0,saturn.p+1,R0+reg); break; //a=r0 wp case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_copy(C,0,saturn.p+1,R0+(reg&7)); break; //c=r0 wp default: saturn_invalid6( 8, 1, 0xa, adr, op, reg); break; } break; case 2: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_exchange(A, 0, saturn.p+1, R0+reg); break; // ar0ex wp case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_exchange(C, 0, saturn.p+1, R0+(reg&7)); break; // cr0ex wp default: saturn_invalid6( 8, 1, 0xa, adr, op, reg); break; } break; default: saturn_invalid5( 8, 1, 0xa, adr, op ); break; } break; case 2: case 3: case 4: case 5: case 6: case 7: case 0xf: switch(op=READ_OP()) { case 0: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_copy(R0+reg,adr_af_begin[adr],adr_af_count[adr],A); break; //r0=a xs case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_copy(R0+(reg&7),adr_af_begin[adr], adr_af_count[adr],C); break; //r0=c xs default: saturn_invalid6( 8, 1, 0xa, adr, op, reg); break; } break; case 1: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_copy(A,adr_af_begin[adr],adr_af_count[adr],R0+reg); break; //a=r0 xs case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_copy(C,adr_af_begin[adr],adr_af_count[adr],R0+(reg&7)); break; //c=r0 xs default: saturn_invalid6( 8, 1, 0xa, adr, op, reg); break; } break; case 2: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 4: saturn_exchange(A, adr_af_begin[adr], adr_af_count[adr], R0+reg); break; // ar0ex xs case 8: case 9: case 0xa: case 0xb: case 0xc: saturn_exchange(C, adr_af_begin[adr], adr_af_count[adr], R0+(reg&7)); break; // cr0ex xs default: saturn_invalid6( 8, 1, 0xa, adr, op, reg); break; } break; default: saturn_invalid5( 8, 1, 0xa, adr, op ); break; } break; default: saturn_invalid4( 8, 1, 0xa, adr ); break; } } static void saturn_instruction_81(void) { int reg, adr; switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_rotate_nibble_left_w(A+reg); break; // aslc w case 4: case 5: case 6: case 7: saturn_rotate_nibble_right_w(A+(reg&3)); break; // asrc w case 8: switch(adr=READ_OP()) { case 0: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_add_const(A+reg, saturn.p, 1, READ_OP()+1); break; case 8: case 9: case 0xa: case 0xb: saturn_sub_const(A+(reg&3), saturn.p, 1, READ_OP()+1); break; default: saturn_invalid5( 8, 1, 8, adr, reg ); break; } break; case 1: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_add_const(A+reg, 0, saturn.p+1, READ_OP()+1); break; case 8: case 9: case 0xa: case 0xb: saturn_sub_const(A+(reg&3), 0, saturn.p+1, READ_OP()+1); break; default: saturn_invalid5( 8, 1, 8, adr, reg ); break; } break; case 2: case 3: case 4: case 5: case 6: case 7: case 0xf: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_add_const(A+reg, adr_af_begin[adr], adr_af_count[adr], READ_OP()+1); break; case 8: case 9: case 0xa: case 0xb: saturn_sub_const(A+(reg&3), adr_af_begin[adr], adr_af_count[adr], READ_OP()+1); break; default: saturn_invalid5( 8, 1, 8, adr, reg ); break; } break; default: saturn_invalid4( 8, 1, 8, adr ); break; } break; case 9: switch(adr=READ_OP()) { case 0: switch(reg=READ_OP()){ case 0: case 1: case 2: case 3: saturn_shift_right(A+reg,saturn.p,1); break; // asrb p default: saturn_invalid5( 8, 1, 9, adr, reg ); break; } break; case 1: switch(reg=READ_OP()){ case 0: case 1: case 2: case 3: saturn_shift_right(A+reg, 0,saturn.p+1); break; // asrb wp default: saturn_invalid5( 8, 1, 9, adr, reg ); break; } break; case 2: case 3: case 4: case 5: case 6: case 7: case 0xf: switch(reg=READ_OP()){ case 0: case 1: case 2: case 3: saturn_shift_right(A+reg, adr_af_begin[adr], adr_af_count[adr]); break; // asrb xs default: saturn_invalid5( 8, 1, 9, adr, reg ); break; } break; default: saturn_invalid4( 8, 1, 9, adr ); break; } break; case 0xa: saturn_instruction_81a(); break; case 0xb: switch(adr=READ_OP()) { case 2: saturn_load_pc(A);break; case 3: saturn_load_pc(C);break; case 4: saturn_store_pc(A);break; case 5: saturn_store_pc(C);break; case 6: saturn_exchange_pc(A);break; case 7: saturn_exchange_pc(C);break; default: saturn_invalid4( 8, 1, reg, adr ); break; } break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_shift_right(A+(reg&3), BEGIN_W, COUNT_W); break; // asrb w } } static void saturn_instruction_8(void) { int oper, adr; switch(READ_OP()) { case 0: saturn_instruction_80(); break; case 1: saturn_instruction_81(); break; case 2: saturn_hst_clear_bits();break; case 3: saturn_hst_bits_cleared();break; case 4: saturn_st_clear_bit();break; case 5: saturn_st_set_bit();break; case 6: saturn_st_jump_bit_clear();break; case 7: saturn_st_jump_bit_set();break; case 8: saturn_p_not_equals(); break; case 9: saturn_p_equals(); break; case 0xa: switch(oper=READ_OP()) { case 0: case 1: case 2: case 3: saturn_equals(reg_left[oper&3] , BEGIN_A, COUNT_A, reg_right[oper&3]); break; case 4: case 5: case 6: case 7: saturn_not_equals(reg_left[oper&3] , BEGIN_A, COUNT_A, reg_right[oper&3]); break; case 8: case 9: case 0xa: case 0xb: saturn_equals_zero(A+(oper&3), BEGIN_A, COUNT_A); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_not_equals_zero(A+(oper&3), BEGIN_A, COUNT_A); break; } break; case 0xb: switch(oper=READ_OP()) { case 0: case 1: case 2: case 3: saturn_greater(reg_left[oper&3] , BEGIN_A, COUNT_A, reg_right[oper&3]); break; case 4: case 5: case 6: case 7: saturn_smaller(reg_left[oper&3] , BEGIN_A, COUNT_A, reg_right[oper&3]); break; case 8: case 9: case 0xa: case 0xb: saturn_greater_equals(reg_left[oper&3], BEGIN_A, COUNT_A, reg_right[oper&3]); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_smaller_equals(reg_left[oper&3], BEGIN_A, COUNT_A, reg_right[oper&3]); break; } break; case 0xc: adr=READ_OP_DIS16(); saturn_jump((adr+saturn.pc-4)&0xfffff,1); break; case 0xd: adr=READ_OP_ARG20(); saturn_jump(adr,1); break; case 0xe: adr=READ_OP_DIS16(); saturn_call((adr+saturn.pc)&0xfffff); break; case 0xf: adr=READ_OP_ARG20(); saturn_call(adr); break; } } static void saturn_instruction_9(void) { int adr, oper; switch(adr=READ_OP()) { case 0: switch(oper=READ_OP()) { case 0: case 1: case 2: case 3: saturn_equals(reg_left[oper&3] , saturn.p, 1, reg_right[oper&3]); break; case 4: case 5: case 6: case 7: saturn_not_equals(reg_left[oper&3] ,saturn.p, 1, reg_right[oper&3]); break; case 8: case 9: case 0xa: case 0xb: saturn_equals_zero(A+(oper&3), saturn.p, 1); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_not_equals_zero(A+(oper&3), saturn.p, 1); break; } break; case 1: switch(oper=READ_OP()) { case 0: case 1: case 2: case 3: saturn_equals(reg_left[oper&3] , 0, saturn.p+1, reg_right[oper&3]); break; case 4: case 5: case 6: case 7: saturn_not_equals(reg_left[oper&3] , 0, saturn.p+1, reg_right[oper&3]); break; case 8: case 9: case 0xa: case 0xb: saturn_equals_zero(A+(oper&3), 0, saturn.p+1); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_not_equals_zero(A+(oper&3), 0, saturn.p+1); break; } break; case 2: case 3: case 4: case 5: case 6: case 7: switch(oper=READ_OP()) { case 0: case 1: case 2: case 3: saturn_equals(reg_left[oper&3] ,adr_a_begin[adr], adr_a_count[adr], reg_right[oper&3]); break; case 4: case 5: case 6: case 7: saturn_not_equals(reg_left[oper&3] ,adr_a_begin[adr], adr_a_count[adr], reg_right[oper&3]); break; case 8: case 9: case 0xa: case 0xb: saturn_equals_zero(A+(oper&3),adr_a_begin[adr], adr_a_count[adr]); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_not_equals_zero(A+(oper&3) ,adr_a_begin[adr], adr_a_count[adr]); break; } break; case 8: switch(oper=READ_OP()) { case 0: case 1: case 2: case 3: saturn_greater(reg_left[oper&3] ,saturn.p, 1, reg_right[oper&3]); break; case 4: case 5: case 6: case 7: saturn_smaller(reg_left[oper&3] ,saturn.p, 1, reg_right[oper&3]); break; case 8: case 9: case 0xa: case 0xb: saturn_greater_equals(reg_left[oper&3] ,saturn.p, 1, reg_right[oper&3]); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_smaller_equals(reg_left[oper&3] ,saturn.p, 1, reg_right[oper&3]); break; } break; case 9: switch(oper=READ_OP()) { case 0: case 1: case 2: case 3: saturn_greater(reg_left[oper&3] , 0, saturn.p+1, reg_right[oper&3]); break; case 4: case 5: case 6: case 7: saturn_smaller(reg_left[oper&3] , 0, saturn.p+1, reg_right[oper&3]); break; case 8: case 9: case 0xa: case 0xb: saturn_greater_equals(reg_left[oper&3], 0, saturn.p+1, reg_right[oper&3]); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_smaller_equals(reg_left[oper&3], 0, saturn.p+1, reg_right[oper&3]); break; } break; case 0xa: case 0xb: case 0xc: case 0xd: case 0xe: case 0xf: switch(oper=READ_OP()) { case 0: case 1: case 2: case 3: saturn_greater(reg_left[oper&3] ,adr_b_begin[adr], adr_b_count[adr], reg_right[oper&3]); break; case 4: case 5: case 6: case 7: saturn_smaller(reg_left[oper&3] ,adr_b_begin[adr], adr_b_count[adr], reg_right[oper&3]); break; case 8: case 9: case 0xa: case 0xb: saturn_greater_equals(reg_left[oper&3] ,adr_b_begin[adr], adr_b_count[adr], reg_right[oper&3]); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_smaller_equals(reg_left[oper&3] ,adr_b_begin[adr], adr_b_count[adr], reg_right[oper&3]); break; } break; } } static void saturn_instruction_a(void) { int reg, adr; switch(adr=READ_OP()) { case 0: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 8: case 9: case 0xa: case 0xb: saturn_add(add_left[reg], saturn.p, 1, add_right[reg]); break; case 4: case 5: case 6: case 7: saturn_add(A+(reg&3), saturn.p, 1, A+(reg&3)); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_decrement(A+(reg&3), saturn.p, 1); break; } break; case 1: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 8: case 9: case 0xa: case 0xb: saturn_add(add_left[reg], 0, saturn.p+1, add_right[reg]); break; case 4: case 5: case 6: case 7: saturn_add(A+(reg&3), 0, saturn.p+1, A+(reg&3)); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_decrement(A+(reg&3), 0, saturn.p+1); break; } break; case 2: case 3: case 4: case 5: case 6: case 7: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 8: case 9: case 0xa: case 0xb: saturn_add(add_left[reg], adr_a_begin[adr], adr_a_count[adr], add_right[reg]); break; case 4: case 5: case 6: case 7: saturn_add(A+(reg&3), adr_a_begin[adr], adr_a_count[adr], A+(reg&3)); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_decrement(A+(reg&3), adr_a_begin[adr], adr_a_count[adr]); break; } break; case 8: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_clear(A+reg, saturn.p,1); break; // a=0 p case 4: case 5: case 6: case 7: case 8: case 9: case 0xa: case 0xb: saturn_copy(reg_right[reg&7], saturn.p,1,reg_left[reg&7]); break; // a=b p case 0xc: case 0xd: case 0xe: case 0xf: saturn_exchange(reg_left[reg&3], saturn.p,1,reg_right[reg&3]); break; // abex p } break; case 9: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_clear(A+reg,0,saturn.p+1); break; // a=0 wp case 4: case 5: case 6: case 7: case 8: case 9: case 0xa: case 0xb: saturn_copy(reg_right[reg&7], 0, saturn.p+1, reg_left[reg&7]); break; // a=b wp case 0xc: case 0xd: case 0xe: case 0xf: saturn_exchange(reg_left[reg&3], 0, saturn.p+1, reg_right[reg&3]); break; // abex wp } break; case 0xa: case 0xb: case 0xc: case 0xd: case 0xe: case 0xf: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_clear(A+reg, adr_b_begin[adr], adr_b_count[adr]); break; // a=0 xs case 4: case 5: case 6: case 7: case 8: case 9: case 0xa: case 0xb: saturn_copy(reg_right[reg&7], adr_b_begin[adr], adr_b_count[adr], reg_left[reg&7]); break; // a=b xs case 0xc: case 0xd: case 0xe: case 0xf: saturn_exchange(reg_left[reg&3], adr_b_begin[adr], adr_b_count[adr], reg_right[reg&3]); break; // abex xs } break; } } static void saturn_instruction_b(void) { int adr, reg; switch(adr=READ_OP()) { case 0: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 8: case 9: case 0xa: case 0xb: saturn_sub(sub_left[reg], saturn.p, 1, sub_right[reg]); break; case 4: case 5: case 6: case 7: saturn_increment(A+(reg&3), saturn.p, 1); break; // a=a+1 p case 0xc: case 0xd: case 0xe: case 0xf: saturn_sub2(sub_left[reg], saturn.p, 1, sub_right[reg]); break; } break; case 1: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 8: case 9: case 0xa: case 0xb: saturn_sub(sub_left[reg], 0, saturn.p+1, sub_right[reg]); break; case 4: case 5: case 6: case 7: saturn_increment(A+(reg&3), 0, saturn.p+1); break; // a=a+1 wp case 0xc: case 0xd: case 0xe: case 0xf: saturn_sub2(sub_left[reg], 0, saturn.p+1, sub_right[reg]); break; } break; case 2: case 3: case 4: case 5: case 6: case 7: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 8: case 9: case 0xa: case 0xb: saturn_sub(sub_left[reg], adr_a_begin[adr], adr_a_count[adr], sub_right[reg]); break; case 4: case 5: case 6: case 7: saturn_increment(A+(reg&3), adr_a_begin[adr], adr_a_count[adr]); break; // a=a+1 xs case 0xc: case 0xd: case 0xe: case 0xf: saturn_sub2(sub_left[reg], adr_a_begin[adr], adr_a_count[adr], sub_right[reg]); break; } break; case 8: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_shift_nibble_left(A+reg, saturn.p, 1); break; // asl p case 4: case 5: case 6: case 7: saturn_shift_nibble_right(A+(reg&3), saturn.p, 1); break; // asr p case 8: case 9: case 0xa: case 0xb: saturn_negate(A+(reg&3), saturn.p, 1); break; // A=-A p case 0xc: case 0xd: case 0xe: case 0xf: saturn_invert(A+(reg&3), saturn.p, 1); break; // A=-A-1 p } break; case 9: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_shift_nibble_left(A+reg,0,saturn.p+1); break; // asl wp case 4: case 5: case 6: case 7: saturn_shift_nibble_right(A+(reg&3),0,saturn.p+1); break; // asr wp case 8: case 9: case 0xa: case 0xb: saturn_negate(A+(reg&3),0,saturn.p+1); break; // A=-A wp case 0xc: case 0xd: case 0xe: case 0xf: saturn_invert(A+(reg&3),0,saturn.p+1); break; // A=-A-1 wp } break; case 0xa: case 0xb: case 0xc: case 0xd: case 0xe: case 0xf: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_shift_nibble_left(A+reg,adr_b_begin[adr], adr_b_count[adr]); break; case 4: case 5: case 6: case 7: saturn_shift_nibble_right(A+(reg&3), adr_b_begin[adr], adr_b_count[adr]); break; case 8: case 9: case 0xa: case 0xb: saturn_negate(A+(reg&3), adr_b_begin[adr], adr_b_count[adr]); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_invert(A+(reg&3), adr_b_begin[adr], adr_b_count[adr]); break; } break; } } static void saturn_instruction(void) { int reg, adr; switch(READ_OP()) { case 0: switch(READ_OP()) { case 0: saturn_return_xm_set();break; case 1: saturn_return(1);break; case 2: saturn_return_carry_set();break; case 3: saturn_return_carry_clear();break; case 4: saturn_sethex();break; case 5: saturn_setdec();break; case 6: saturn_push_c();break; case 7: saturn_pop_c();break; case 8: saturn_clear_st();break; case 9: saturn_st_to_c();break; case 0xa: saturn_c_to_st();break; case 0xb: saturn_exchange_c_st();break; case 0xc: saturn_inc_p();break; case 0xd: saturn_dec_p();break; case 0xe: saturn_instruction_0e();break; case 0xf: saturn_return_interrupt();break; } break; case 1: saturn_instruction_1(); break; case 2: saturn_load_p(); break; case 3: saturn_load_reg(C); break; // lc case 4: adr=READ_OP_DIS8(); if (adr==0) { saturn_return(saturn.carry); } else { saturn_jump((saturn.pc+adr-2)&0xfffff, saturn.carry); } break; case 5: adr=READ_OP_DIS8(); if (adr==0) { saturn_return(!saturn.carry); } else { saturn_jump((saturn.pc+adr-2)&0xfffff,!saturn.carry); } break; case 6: adr=READ_OP_DIS12(); saturn_jump((saturn.pc+adr-3)&0xfffff,1); break; case 7: adr=READ_OP_DIS12(); saturn_call((adr+saturn.pc)&0xfffff); break; case 8: saturn_instruction_8(); break; case 9: saturn_instruction_9(); break; case 0xa: saturn_instruction_a(); break; case 0xb: saturn_instruction_b(); break; case 0xc: switch (reg=READ_OP()) { case 0: case 1: case 2: case 3: case 8: case 9: case 0xa: case 0xb: saturn_add(add_left[reg], BEGIN_A, COUNT_A, add_right[reg]); break; case 4: case 5: case 6: case 7: saturn_add(A+(reg&3), BEGIN_A, COUNT_A, A+(reg&3)); break; case 0xc: case 0xd: case 0xe: case 0xf: saturn_decrement(A+(reg&3), BEGIN_A, COUNT_A); break; } break; case 0xd: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_clear(A+reg, BEGIN_A, COUNT_A); break; // a=0 a case 4: case 5: case 6: case 7: case 8: case 9: case 0xa: case 0xb: saturn_copy(reg_right[reg&7], BEGIN_A, COUNT_A, reg_left[reg&7]); break; // a=b a case 0xc: case 0xd: case 0xe: case 0xf: saturn_exchange(reg_left[reg&3], BEGIN_A, COUNT_A, reg_right[reg&3]); break; // abex a } break; case 0xe: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: case 8: case 9: case 0xa: case 0xb: saturn_sub(sub_left[reg], BEGIN_A, COUNT_A, sub_right[reg]); break; case 4: case 5: case 6: case 7: saturn_increment(A+(reg&3), BEGIN_A, COUNT_A); break; // a=a+1 a case 0xc: case 0xd: case 0xe: case 0xf: saturn_sub2(sub_left[reg], BEGIN_A, COUNT_A, sub_right[reg]); break; } break; case 0xf: switch(reg=READ_OP()) { case 0: case 1: case 2: case 3: saturn_shift_nibble_left(A+reg,BEGIN_A, COUNT_A); break; // asl a case 4: case 5: case 6: case 7: saturn_shift_nibble_right(A+(reg&3),BEGIN_A, COUNT_A); break; // asr a case 8: case 9: case 0xa: case 0xb: saturn_negate(A+(reg&3),BEGIN_A, COUNT_A); break; // A=-A a case 0xc: case 0xd: case 0xe: case 0xf: saturn_invert(A+(reg&3),BEGIN_A, COUNT_A); break; // A=-A-1 a } break; } }