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Stubs in enough to get back into a persistent loop.

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This commit is contained in:
Thomas Harte 2021-07-22 22:00:53 -04:00
parent 69d62560b4
commit de208ead4e
2 changed files with 34 additions and 0 deletions
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30
Machines/Amiga/Chipset.cpp
View File

@ -63,6 +63,13 @@ void Chipset::perform(const CPU::MC68000::Microcycle &cycle) {
cycle.set_value16(position);
} break;
case Write(0x02a):
LOG("TODO: write vertical position high " << PADHEX(4) << cycle.value16());
break;
case Write(0x02c):
LOG("TODO: write vertical position low " << PADHEX(4) << cycle.value16());
break;
// Disk DMA.
case Write(0x020): case Write(0x022): case Write(0x024):
case Write(0x026):
@ -104,6 +111,29 @@ void Chipset::perform(const CPU::MC68000::Microcycle &cycle) {
LOG("Interrupt request modified by " << PADHEX(4) << cycle.value16() << "; is now " << std::bitset<16>{interrupt_requests_});
break;
// Display management.
case Write(0x08e): {
const uint16_t value = cycle.value16();
display_window_start_[0] = value & 0xff;
display_window_start_[1] = value >> 8;
LOG("Display window start set to " << std::dec << display_window_start_[0] << ", " << display_window_start_[1]);
} break;
case Write(0x090): {
const uint16_t value = cycle.value16();
display_window_stop_[0] = 0x100 | (value & 0xff);
display_window_stop_[1] = value >> 8;
display_window_stop_[1] |= ((value >> 7) & 0x100) ^ 0x100;
LOG("Display window stop set to " << std::dec << display_window_stop_[0] << ", " << display_window_stop_[1]);
} break;
case Write(0x092):
fetch_window_[0] = uint16_t((cycle.value16() & 0xfc) << 1);
LOG("Fetch window start set to " << std::dec << fetch_window_[0]);
break;
case Write(0x094):
fetch_window_[1] = uint16_t((cycle.value16() & 0xfc) << 1);
LOG("Fetch window stop set to " << std::dec << fetch_window_[1]);
break;
// Bitplanes.
case Write(0x100):
case Write(0x102):

4
Machines/Amiga/Chipset.hpp
View File

@ -60,6 +60,10 @@ class Chipset {
int x_ = 0, y_ = 0;
int line_length_ = 227;
uint16_t display_window_start_[2] = {0, 0};
uint16_t display_window_stop_[2] = {0, 0};
uint16_t fetch_window_[2] = {0, 0};
};
}