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Added: now declines to pass on output if in input mode for ports A and B.

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This commit is contained in:
Thomas Harte 2017-08-07 19:56:22 -04:00
parent 41a30c147d
commit 390ecec3d9
1 changed files with 11 additions and 2 deletions
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13
Components/8255/i8255.hpp
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@ -26,8 +26,17 @@ template <class T> class i8255 {
void set_register(int address, uint8_t value) { void set_register(int address, uint8_t value) {
switch(address & 3) { switch(address & 3) {
case 0: outputs_[0] = value; port_handler_.set_value(0, value); break; case 0:
case 1: outputs_[1] = value; port_handler_.set_value(1, value); break; if(!(control_ & 0x10)) {
// TODO: so what would output be when switching from input to output mode?
outputs_[0] = value; port_handler_.set_value(0, value);
}
break;
case 1:
if(!(control_ & 0x02)) {
outputs_[1] = value; port_handler_.set_value(1, value);
}
break;
case 2: outputs_[2] = value; port_handler_.set_value(2, value); break; case 2: outputs_[2] = value; port_handler_.set_value(2, value); break;
case 3: case 3:
if(value & 0x80) { if(value & 0x80) {