6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2025-01-11 08:30:55 +00:00
Code Issues Projects Releases Wiki Activity

Per the ROM disassembly, the Vic's VIA outputs are inverted for the benefit of the serial bus.

Browse Source
This commit is contained in:
Thomas Harte 2016-07-07 06:57:21 -04:00
parent c9479f923b
commit 81e6cc34e5
2 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Machines/Commodore/Vic-20/Vic20.hpp
View File

@ -92,10 +92,11 @@ class UserPortVIA: public MOS::MOS6522<UserPortVIA>, public MOS::MOS6522IRQDeleg
}
void set_port_output(Port port, uint8_t value, uint8_t mask) {
// Line 7 of port A is inverted and output as serial ATN
if(!port) {
std::shared_ptr<::Commodore::Serial::Port> serialPort = _serialPort.lock();
if(serialPort)
serialPort->set_output(::Commodore::Serial::Line::Attention, (::Commodore::Serial::LineLevel)(value&0x80));
serialPort->set_output(::Commodore::Serial::Line::Attention, (::Commodore::Serial::LineLevel)!(value&0x80));
}
}
@ -153,10 +154,11 @@ class KeyboardVIA: public MOS::MOS6522<KeyboardVIA>, public MOS::MOS6522IRQDeleg
if(line == Line::Two) {
std::shared_ptr<::Commodore::Serial::Port> serialPort = _serialPort.lock();
if(serialPort) {
// CB2 is inverted to become serial data; CA2 is inverted to become serial clock
if(port == Port::A) {
serialPort->set_output(::Commodore::Serial::Line::Clock, (::Commodore::Serial::LineLevel)value);
serialPort->set_output(::Commodore::Serial::Line::Clock, (::Commodore::Serial::LineLevel)!value);
} else {
serialPort->set_output(::Commodore::Serial::Line::Data, (::Commodore::Serial::LineLevel)value);
serialPort->set_output(::Commodore::Serial::Line::Data, (::Commodore::Serial::LineLevel)!value);
}
}
}

2
OSBindings/Mac/Clock Signal/Machine/Wrappers/CSVic20.mm
View File

@ -144,7 +144,9 @@ using namespace Commodore::Vic20;
_vic20.set_key_state((Key)targetKey.integerValue, isPressed);
}
else
{
NSLog(@"Unmapped: %02x", key);
}
} break;
case VK_Shift: