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252 lines
9.0 KiB
C++
252 lines
9.0 KiB
C++
//
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// Vic20.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 04/06/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "Vic20.hpp"
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#include <algorithm>
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using namespace Vic20;
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Machine::Machine() :
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_rom(nullptr)
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{
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_userPortVIA.set_delegate(this);
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_keyboardVIA.set_delegate(this);
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set_reset_line(true);
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}
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Machine::~Machine()
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{
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delete[] _rom;
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}
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unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value)
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{
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set_reset_line(false);
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// run the phase-1 part of this cycle, in which the VIC accesses memory
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uint16_t video_address = _mos6560->get_address();
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uint8_t video_value = 0xff; // TODO
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if(!(video_address&0x2000))
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{
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video_value = _characterROM[video_address & 0x0fff];
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}
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else
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{
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video_address &= 0x1fff;
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if(video_address < sizeof(_userBASICMemory)) video_value = _userBASICMemory[video_address];
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else if(video_address >= 0x1000 && video_address < 0x2000) video_value = _screenMemory[video_address&0x0fff];
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}
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_mos6560->set_graphics_value(video_value, _colorMemory[video_address & 0x03ff]);
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// run the phase-2 part of the cycle, which is whatever the 6502 said it should be
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if(isReadOperation(operation))
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{
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uint8_t result = read_memory(address);
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if((address&0xff00) == 0x9000)
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{
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result &= _mos6560->get_register(address);
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}
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if((address&0xfc10) == 0x9010)
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{
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result &= _userPortVIA.get_register(address);
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}
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if((address&0xfc20) == 0x9020)
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{
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result &= _keyboardVIA.get_register(address);
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}
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*value = result;
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}
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else
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{
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uint8_t *ram = ram_pointer(address);
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if(ram) *ram = *value;
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if((address&0xff00) == 0x9000)
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{
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_mos6560->set_register(address, *value);
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}
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if((address&0xfc10) == 0x9010)
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{
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_userPortVIA.set_register(address, *value);
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}
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if((address&0xfc20) == 0x9020)
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{
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_keyboardVIA.set_register(address, *value);
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}
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}
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_userPortVIA.run_for_half_cycles(2);
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_keyboardVIA.run_for_half_cycles(2);
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if(_typer) _typer->update(1);
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return 1;
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}
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#pragma mark - 6522 delegate
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void Machine::mos6522_did_change_interrupt_status(void *mos6522)
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{
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bool irq = _userPortVIA.get_interrupt_line() || _keyboardVIA.get_interrupt_line();
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set_irq_line(irq);
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}
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#pragma mark - Setup
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void Machine::setup_output(float aspect_ratio)
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{
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_mos6560 = std::unique_ptr<MOS::MOS6560>(new MOS::MOS6560());
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}
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void Machine::set_rom(ROMSlot slot, size_t length, const uint8_t *data)
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{
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uint8_t *target = nullptr;
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size_t max_length = 0x2000;
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switch(slot)
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{
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case ROMSlotKernel: target = _kernelROM; break;
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case ROMSlotCharacters: target = _characterROM; max_length = 0x1000; break;
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case ROMSlotBASIC: target = _basicROM; break;
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}
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if(target)
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{
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size_t length_to_copy = std::min(max_length, length);
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memcpy(target, data, length_to_copy);
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}
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}
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void Machine::add_prg(size_t length, const uint8_t *data)
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{
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if(length > 2)
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{
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_rom_address = (uint16_t)(data[0] | (data[1] << 8));
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_rom_length = (uint16_t)(length - 2);
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if(_rom_address >= 0x1000 && _rom_address+_rom_length < 0x2000)
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{
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set_typer_for_string("RUN\n");
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}
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_rom = new uint8_t[length - 2];
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memcpy(_rom, &data[2], length - 2);
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}
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}
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#pragma mark - Typer
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int Machine::get_typer_delay()
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{
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return get_reset_line() ? 1*263*60*65 : 0; // wait two seconds if resetting
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}
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int Machine::get_typer_frequency()
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{
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return 2*263*65; // accept a new character every two fields
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}
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bool Machine::typer_set_next_character(::Utility::Typer *typer, char character, int phase)
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{
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// If there's a 'ROM' installed that can never be accessed, assume that this typing was scheduled because
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// it should be in RAM. So copy it there.
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if(_rom && _rom_address >= 0x1000 && _rom_address+_rom_length < 0x2000)
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{
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memcpy(&_screenMemory[_rom_address - 0x1000], _rom, _rom_length);
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delete[] _rom;
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_rom = nullptr;
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}
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if(!phase) clear_all_keys();
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// The following table is arranged in ASCII order
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Key key_sequences[][3] = {
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{NotMapped}, {NotMapped}, {NotMapped}, {NotMapped}, {NotMapped}, {NotMapped}, {NotMapped}, {NotMapped},
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{KeyDelete, TerminateSequence},
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{NotMapped},
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{KeyReturn, TerminateSequence},
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{NotMapped}, {NotMapped}, {NotMapped}, {NotMapped}, {NotMapped},
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{NotMapped}, {NotMapped}, {NotMapped}, {NotMapped},
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{NotMapped}, {NotMapped}, {NotMapped}, {NotMapped},
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{NotMapped}, {NotMapped}, {NotMapped}, {NotMapped},
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{NotMapped}, {NotMapped}, {NotMapped}, {NotMapped},
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{KeySpace, TerminateSequence}, // space
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{KeyLShift, Key1, TerminateSequence}, {KeyLShift, Key2, TerminateSequence}, // !, "
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{KeyLShift, Key3, TerminateSequence}, {KeyLShift, Key4, TerminateSequence}, // #, $
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{KeyLShift, Key5, TerminateSequence}, {KeyLShift, Key6, TerminateSequence}, // %, &
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{KeyLShift, Key7, TerminateSequence}, {KeyLShift, Key8, TerminateSequence}, // ', (
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{KeyLShift, Key9, TerminateSequence}, {KeyAsterisk, TerminateSequence}, // ), *
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{KeyPlus, TerminateSequence}, {KeyComma, TerminateSequence}, // +, ,
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{KeyDash, TerminateSequence}, {KeyFullStop, TerminateSequence}, // -, .
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{KeySlash, TerminateSequence}, // /
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{Key0, TerminateSequence}, {Key1, TerminateSequence}, // 0, 1
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{Key2, TerminateSequence}, {Key3, TerminateSequence}, // 2, 3
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{Key4, TerminateSequence}, {Key5, TerminateSequence}, // 4, 5
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{Key6, TerminateSequence}, {Key7, TerminateSequence}, // 6, 7
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{Key8, TerminateSequence}, {Key9, TerminateSequence}, // 8, 9
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{KeyColon, TerminateSequence}, {KeySemicolon, TerminateSequence}, // :, ;
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{KeyLShift, KeyComma, TerminateSequence}, {KeyEquals, TerminateSequence}, // <, =
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{KeyLShift, KeyFullStop, TerminateSequence}, {KeyLShift, KeySlash, TerminateSequence}, // >, ?
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{KeyAt, TerminateSequence}, // @
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{KeyA, TerminateSequence}, {KeyB, TerminateSequence}, {KeyC, TerminateSequence}, {KeyD, TerminateSequence}, // A, B, C, D
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{KeyE, TerminateSequence}, {KeyF, TerminateSequence}, {KeyG, TerminateSequence}, {KeyH, TerminateSequence}, // E, F, G, H
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{KeyI, TerminateSequence}, {KeyJ, TerminateSequence}, {KeyK, TerminateSequence}, {KeyL, TerminateSequence}, // I, J, K L
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{KeyM, TerminateSequence}, {KeyN, TerminateSequence}, {KeyO, TerminateSequence}, {KeyP, TerminateSequence}, // M, N, O, P
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{KeyQ, TerminateSequence}, {KeyR, TerminateSequence}, {KeyS, TerminateSequence}, {KeyT, TerminateSequence}, // Q, R, S, T
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{KeyU, TerminateSequence}, {KeyV, TerminateSequence}, {KeyW, TerminateSequence}, {KeyX, TerminateSequence}, // U, V, W X
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{KeyY, TerminateSequence}, {KeyZ, TerminateSequence}, // Y, Z
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{KeyLShift, KeyColon, TerminateSequence}, {NotMapped}, // [, '\'
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{KeyLShift, KeyFullStop, TerminateSequence}, {NotMapped}, // ], ^
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{NotMapped}, {NotMapped}, // _, `
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{KeyA, TerminateSequence}, {KeyB, TerminateSequence}, {KeyC, TerminateSequence}, {KeyD, TerminateSequence}, // A, B, C, D
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{KeyE, TerminateSequence}, {KeyF, TerminateSequence}, {KeyG, TerminateSequence}, {KeyH, TerminateSequence}, // E, F, G, H
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{KeyI, TerminateSequence}, {KeyJ, TerminateSequence}, {KeyK, TerminateSequence}, {KeyL, TerminateSequence}, // I, J, K L
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{KeyM, TerminateSequence}, {KeyN, TerminateSequence}, {KeyO, TerminateSequence}, {KeyP, TerminateSequence}, // M, N, O, P
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{KeyQ, TerminateSequence}, {KeyR, TerminateSequence}, {KeyS, TerminateSequence}, {KeyT, TerminateSequence}, // Q, R, S, T
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{KeyU, TerminateSequence}, {KeyV, TerminateSequence}, {KeyW, TerminateSequence}, {KeyX, TerminateSequence}, // U, V, W X
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{KeyY, TerminateSequence}, {KeyZ, TerminateSequence}, // Y, Z
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// {KeyLShift, KeyA, TerminateSequence}, {KeyLShift, KeyB, TerminateSequence}, // a, b
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// {KeyLShift, KeyC, TerminateSequence}, {KeyLShift, KeyD, TerminateSequence}, // c, d
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// {KeyLShift, KeyE, TerminateSequence}, {KeyLShift, KeyF, TerminateSequence}, // e, f
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// {KeyLShift, KeyG, TerminateSequence}, {KeyLShift, KeyH, TerminateSequence}, // g, h
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// {KeyLShift, KeyI, TerminateSequence}, {KeyLShift, KeyJ, TerminateSequence}, // i, j
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// {KeyLShift, KeyK, TerminateSequence}, {KeyLShift, KeyL, TerminateSequence}, // k, l
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// {KeyLShift, KeyM, TerminateSequence}, {KeyLShift, KeyN, TerminateSequence}, // m, n
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// {KeyLShift, KeyO, TerminateSequence}, {KeyLShift, KeyP, TerminateSequence}, // o, p
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// {KeyLShift, KeyQ, TerminateSequence}, {KeyLShift, KeyR, TerminateSequence}, // q, r
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// {KeyLShift, KeyS, TerminateSequence}, {KeyLShift, KeyT, TerminateSequence}, // s, t
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// {KeyLShift, KeyU, TerminateSequence}, {KeyLShift, KeyV, TerminateSequence}, // u, v
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// {KeyLShift, KeyW, TerminateSequence}, {KeyLShift, KeyX, TerminateSequence}, // w, x
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// {KeyLShift, KeyY, TerminateSequence}, {KeyLShift, KeyZ, TerminateSequence}, // y, z
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};
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Key *key_sequence = nullptr;
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character &= 0x7f;
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if(character < sizeof(key_sequences) / sizeof(*key_sequences))
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{
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key_sequence = key_sequences[character];
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if(key_sequence[0] != NotMapped)
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{
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if(phase > 0)
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{
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set_key_state(key_sequence[phase-1], true);
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return key_sequence[phase] == TerminateSequence;
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}
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else
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return false;
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}
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}
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return true;
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}
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