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Prove to my caveman self that no text is being written.

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This commit is contained in:
Thomas Harte
2023-11-20 23:11:27 -05:00
parent c4e9f75709
commit 058080f6de
1 changed files with 5 additions and 1 deletions
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6
Machines/PCCompatible/PCCompatible.cpp
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@@ -158,6 +158,7 @@ class i8255PortHandler : public Intel::i8255::PortHandler {
uint8_t get_value(int port) { uint8_t get_value(int port) {
switch(port) { switch(port) {
// TODO: returned value should depend on 'PBSW', a value written... somewhere?
case 2: case 2:
// b7: 1 => memory parity error; 0 => none; // b7: 1 => memory parity error; 0 => none;
// b6: 1 => IO channel error; 0 => none; // b6: 1 => IO channel error; 0 => none;
@@ -167,7 +168,6 @@ class i8255PortHandler : public Intel::i8255::PortHandler {
// b1: 1 => FPU present; 0 => absent; // b1: 1 => FPU present; 0 => absent;
// b0: 1 => floppy drive present; 0 => absent. // b0: 1 => floppy drive present; 0 => absent.
return 0b0000'1100; return 0b0000'1100;
break;
} }
printf("PPI: from %d\n", port); printf("PPI: from %d\n", port);
return 0; return 0;
@@ -379,6 +379,10 @@ struct Memory {
// Accesses an address based on physical location. // Accesses an address based on physical location.
template <typename IntT, AccessType type> template <typename IntT, AccessType type>
typename InstructionSet::x86::Accessor<IntT, type>::type access(uint32_t address) { typename InstructionSet::x86::Accessor<IntT, type>::type access(uint32_t address) {
if(address >= 0xb'0000 && is_writeable(type)) {
printf("MDA?\n");
}
// Dispense with the single-byte case trivially. // Dispense with the single-byte case trivially.
if constexpr (std::is_same_v<IntT, uint8_t>) { if constexpr (std::is_same_v<IntT, uint8_t>) {
return memory[address]; return memory[address];