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Still fumbling in the margins: made an effort not to imply that the 1540 is forever reading syncs.

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This commit is contained in:
Thomas Harte 2016-07-07 22:13:18 -04:00
parent 199c0e27e0
commit 9a08ef61cb
2 changed files with 13 additions and 2 deletions
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2
Machines/Commodore/1540/Commodore1540.cpp
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@ -30,6 +30,8 @@ void Machine::set_serial_bus(std::shared_ptr<::Commodore::Serial::Bus> serial_bu
unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value)
{
// if(operation == CPU6502::BusOperation::ReadOpcode) printf("%04x\n", address);
if(address < 0x800)
{
if(isReadOperation(operation))

13
Machines/Commodore/1540/Commodore1540.hpp
View File

@ -20,7 +20,7 @@ class SerialPortVIA: public MOS::MOS6522<SerialPortVIA>, public MOS::MOS6522IRQD
public:
using MOS6522IRQDelegate::set_interrupt_status;
SerialPortVIA() : _portB(0x9f) {}
SerialPortVIA() : _portB(0x9f), _attention_acknowledge_level(false) {}
uint8_t get_port_input(Port port) {
if(port) {
@ -35,9 +35,12 @@ class SerialPortVIA: public MOS::MOS6522<SerialPortVIA>, public MOS::MOS6522IRQD
std::shared_ptr<::Commodore::Serial::Port> serialPort = _serialPort.lock();
if(serialPort) {
printf("1540 output: %02x\n", value);
// serialPort->set_output(::Commodore::Serial::Line::Attention, !(value&0x10));
// "ATNA (Attention Acknowledge) is an output from PB4 which is sensed on the serial data line after being exclusively "ored" by the attention line and inverted"
_attention_acknowledge_level = !(value&0x10);
serialPort->set_output(::Commodore::Serial::Line::Clock, (::Commodore::Serial::LineLevel)!(value&0x08));
serialPort->set_output(::Commodore::Serial::Line::Data, (::Commodore::Serial::LineLevel)!(value&0x02));
// serialPort->set_output(::Commodore::Serial::Line::Data, _attention_acknowledge_level )
}
// printf("1540 serial port VIA port B: %02x\n", value);
}
@ -52,6 +55,7 @@ class SerialPortVIA: public MOS::MOS6522<SerialPortVIA>, public MOS::MOS6522IRQD
case ::Commodore::Serial::Line::Data: _portB = (_portB & ~0x01) | (value ? 0x00 : 0x01); break;
case ::Commodore::Serial::Line::Clock: _portB = (_portB & ~0x04) | (value ? 0x00 : 0x04); break;
case ::Commodore::Serial::Line::Attention:
// "ATN (Attention) is an input on pin 3 of P2 and P3 that is sensed at PB7 and CA1 of UC3 after being inverted by UA1"
_portB = (_portB & ~0x80) | (value ? 0x00 : 0x80);
set_control_line_input(Port::A, Line::One, !value);
break;
@ -65,6 +69,7 @@ class SerialPortVIA: public MOS::MOS6522<SerialPortVIA>, public MOS::MOS6522IRQD
private:
uint8_t _portB;
std::weak_ptr<::Commodore::Serial::Port> _serialPort;
bool _attention_acknowledge_level;
};
class DriveVIA: public MOS::MOS6522<DriveVIA>, public MOS::MOS6522IRQDelegate {
@ -72,6 +77,10 @@ class DriveVIA: public MOS::MOS6522<DriveVIA>, public MOS::MOS6522IRQDelegate {
using MOS6522IRQDelegate::set_interrupt_status;
uint8_t get_port_input(Port port) {
if(port)
{
return 0x7f; // imply not sync, write protect tab uncovered
}
return 0xff;
}
};