diff options
Diffstat (limited to 'emu/6502.c')
| -rw-r--r-- | emu/6502.c | 10 |
1 files changed, 6 insertions, 4 deletions
@@ -76,9 +76,9 @@ void cpu_6502_write_word( cpu_6502_t *cpu, uint16_t addr, uint16_t data ) cpu->memory->write( cpu->memory, addr + 1, ( data && 0x00FF ) ); } -void cpu_6502_run( cpu_6502_t *cpu ) +void cpu_6502_run( cpu_6502_t *cpu, int steps ) { - while( true ) { + for( int i = 0; i < steps; i++ ) { cpu_6502_step( cpu ); } } @@ -138,7 +138,7 @@ static bool is_carry( cpu_6502_t *cpu ) void cpu_6502_print_state( cpu_6502_t *cpu, uint8_t opcode ) { - fprintf( stderr, "PC: %04X SP: 01%02X PS: %02X %c%c-%c%c%c%c%c A: %02X X: %02X Y: %02X OP: %02X\n", + fprintf( stderr, "PC: %04X SP: 01%02X PS: %02X %c%c-%c%c%c%c%c A: %02X X: %02X Y: %02X OP: %02X steps: %d\n", cpu->PC, cpu->SP, cpu->PS, is_negative( cpu ) ? 'N' : 'n', is_overflow( cpu ) ? 'V' : 'v', @@ -147,7 +147,7 @@ void cpu_6502_print_state( cpu_6502_t *cpu, uint8_t opcode ) is_interrupt( cpu ) ? 'I' : 'i', is_zero( cpu ) ? 'Z' : 'z', is_carry( cpu ) ? 'C' : 'c', - cpu->A, cpu->X, cpu->Y, opcode ); + cpu->A, cpu->X, cpu->Y, opcode, cpu->steps ); } static void update_negative_and_sign( cpu_6502_t *cpu, uint8_t x ) @@ -253,4 +253,6 @@ void cpu_6502_step( cpu_6502_t *cpu ) fprintf( stderr, "ERROR: Illegal opcode %02X at PC %04X\n", opcode, cpu->PC ); exit( EXIT_FAILURE ); } + + cpu->steps++; } |