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88 lines
1.3 KiB
Plaintext
88 lines
1.3 KiB
Plaintext
//
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// MOS6522Bridge.m
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// Clock Signal
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//
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// Created by Thomas Harte on 18/06/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#import "MOS6522Bridge.h"
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#include "6522.hpp"
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@class MOS6522Bridge;
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class VanillaVIA: public MOS::MOS6522<VanillaVIA> {
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public:
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MOS6522Bridge *bridge;
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bool irq_line;
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uint8_t port_a_value;
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uint8_t port_b_value;
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void set_interrupt_status(bool new_status)
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{
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irq_line = new_status;
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}
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uint8_t get_port_input(Port port)
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{
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return port ? port_b_value : port_a_value;
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}
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};
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@implementation MOS6522Bridge
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{
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VanillaVIA _via;
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}
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- (instancetype)init
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{
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self = [super init];
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if(self)
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{
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_via.bridge = self;
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}
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return self;
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}
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- (void)setValue:(uint8_t)value forRegister:(NSUInteger)registerNumber
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{
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_via.set_register((int)registerNumber, value);
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}
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- (uint8_t)valueForRegister:(NSUInteger)registerNumber
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{
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return _via.get_register((int)registerNumber);
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}
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- (void)runForHalfCycles:(NSUInteger)numberOfHalfCycles
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{
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_via.run_for_half_cycles((int)numberOfHalfCycles);
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}
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- (BOOL)irqLine
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{
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return _via.irq_line;
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}
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- (void)setPortAInput:(uint8_t)portAInput
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{
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_via.port_a_value = portAInput;
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}
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- (uint8_t)portAInput
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{
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return _via.port_a_value;
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}
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- (void)setPortBInput:(uint8_t)portBInput
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{
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_via.port_b_value = portBInput;
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}
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- (uint8_t)portBInput
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{
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return _via.port_b_value;
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}
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@end
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