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r65emu/acia.cpp
2023-09-27 11:27:45 +01:00

51 lines
844 B
C++

#include <stdint.h>
#include "memory.h"
#include "serialio.h"
#include "acia.h"
void ACIA::write(Memory::address a, uint8_t b) {
if (a & 1) {
_device->write(b);
return;
}
if ((b & cd_mask) == reset) {
_device->reset();
return;
}
switch (b & ws_mask) {
case ws7e2:
_device->framing(7, 2, even);
break;
case ws7o2:
_device->framing(7, 2, odd);
break;
case ws7e1:
_device->framing(7, 1, even);
break;
case ws7o1:
_device->framing(7, 1, odd);
break;
case ws8n2:
_device->framing(8, 2, none);
break;
case ws8n1:
_device->framing(8, 1, none);
break;
case ws8e1:
_device->framing(8, 1, even);
break;
case ws8o1:
_device->framing(8, 1, odd);
break;
};
// FIXME: more
}
uint8_t ACIA::read(Memory::address a) {
if (a & 1)
return _device->read();
return _device->more()? rdrf | tdre: tdre;
}