diff --git a/Machines/Oric/Oric.cpp b/Machines/Oric/Oric.cpp index 9a1ac6494..7265828dc 100644 --- a/Machines/Oric/Oric.cpp +++ b/Machines/Oric/Oric.cpp @@ -26,7 +26,7 @@ void Machine::set_rom(std::vector data) unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value) { - if(address > 0xc000) + if(address >= 0xc000) { if(isReadOperation(operation)) *value = _rom[address&16383]; } diff --git a/Machines/Oric/Video.cpp b/Machines/Oric/Video.cpp index e0a647d98..aa724e503 100644 --- a/Machines/Oric/Video.cpp +++ b/Machines/Oric/Video.cpp @@ -14,7 +14,8 @@ VideoOutput::VideoOutput(uint8_t *memory) : _ram(memory), _frame_counter(0), _counter(0), _state(Sync), _cycles_in_state(0), - _is_graphics_mode(false) + _is_graphics_mode(false), + _character_set_base_address(0xb400) { _crt.reset(new Outputs::CRT::CRT(64*6, 6, Outputs::CRT::DisplayType::PAL50, 1)); @@ -41,9 +42,16 @@ void VideoOutput::run_for_cycles(int number_of_cycles) while(number_of_cycles--) { _counter = (_counter + 1)%(312 * 64); // TODO: NTSC + int h_counter =_counter & 63; + + if(!h_counter) + { + _ink = 0xff; + _paper = 0x00; + _style = 0x00; // TODO: this means standard-size standard charset? + } State new_state = Blank; - int h_counter =_counter & 63; if( (h_counter >= 48 && h_counter <= 53) || (_counter >= 256*64 && _counter <= 259*64)) new_state = Sync; @@ -64,20 +72,54 @@ void VideoOutput::run_for_cycles(int number_of_cycles) _cycles_in_state++; if(new_state == Pixels) { - uint8_t pixels; + uint8_t pixels, control_byte; + if(_is_graphics_mode) { - // TODO + control_byte = pixels = _ram[0xa000 + (_counter >> 6) * 40 + h_counter]; } else { int address = 0xbb80 + (_counter >> 9) * 40 + h_counter; - uint8_t character = _ram[address]; - pixels = _ram[0xb400 + character * 8 + ((_counter >> 6) & 7)]; + control_byte = _ram[address]; + pixels = _ram[_character_set_base_address + control_byte * 8 + ((_counter >> 6) & 7)]; + } + + if((control_byte & 0x7f) >= 32) + { + uint8_t colours[2] = { + (control_byte & 0x80) ? _ink : _paper, + (control_byte & 0x80) ? _paper : _ink, + }; + + _pixel_target[0] = (colours[(pixels >> 4)&1] & 0x0f) | (colours[(pixels >> 5)&1] & 0xf0); + _pixel_target[1] = (colours[(pixels >> 2)&1] & 0x0f) | (colours[(pixels >> 3)&1] & 0xf0); + _pixel_target[2] = (colours[(pixels >> 0)&1] & 0x0f) | (colours[(pixels >> 1)&1] & 0xf0); + } + else + { + switch(control_byte & 0x7f) + { + case 0x00: _ink = 0x00; break; + case 0x01: _ink = 0x44; break; + case 0x02: _ink = 0x22; break; + case 0x03: _ink = 0x66; break; + case 0x04: _ink = 0x11; break; + case 0x05: _ink = 0x55; break; + case 0x06: _ink = 0x33; break; + case 0x07: _ink = 0x77; break; + case 0x10: _paper = 0x00; break; + case 0x11: _paper = 0x44; break; + case 0x12: _paper = 0x22; break; + case 0x13: _paper = 0x66; break; + case 0x14: _paper = 0x11; break; + case 0x15: _paper = 0x55; break; + case 0x16: _paper = 0x33; break; + case 0x17: _paper = 0x77; break; + default: break; + } + _pixel_target[0] = _pixel_target[1] = _pixel_target[2] = _paper; } - _pixel_target[0] = ((pixels & 0x10) ? 0xf : 0x0) | ((pixels & 0x20) ? 0xf0 : 0x00); - _pixel_target[1] = ((pixels & 0x04) ? 0xf : 0x0) | ((pixels & 0x08) ? 0xf0 : 0x00); - _pixel_target[2] = ((pixels & 0x01) ? 0xf : 0x0) | ((pixels & 0x02) ? 0xf0 : 0x00); _pixel_target += 3; } } diff --git a/Machines/Oric/Video.hpp b/Machines/Oric/Video.hpp index f7b8b2925..300ded3f0 100644 --- a/Machines/Oric/Video.hpp +++ b/Machines/Oric/Video.hpp @@ -35,6 +35,7 @@ class VideoOutput { // Registers uint8_t _ink, _style, _paper; + int _character_set_base_address; bool _is_graphics_mode; };