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Apply a crop, allow time until Z80 slot to be a future-based query.

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This commit is contained in:
Thomas Harte 2021-06-27 17:13:07 -04:00
parent 1ea034310a
commit f2d7b9f6a9
2 changed files with 6 additions and 3 deletions
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7
Machines/Enterprise/Nick.cpp
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@ -52,6 +52,9 @@ Nick::Nick(const uint8_t *ram) :
// Just use RGB for now.
crt_.set_display_type(Outputs::Display::DisplayType::RGB);
// Crop to the centre 90% of the display.
crt_.set_visible_area(Outputs::Display::Rect(0.05f, 0.05f, 0.9f, 0.9f));
}
void Nick::write(uint16_t address, uint8_t value) {
@ -92,7 +95,7 @@ uint8_t Nick::read([[maybe_unused]] uint16_t address) {
return 0xff;
}
Cycles Nick::get_time_until_z80_slot() const {
Cycles Nick::get_time_until_z80_slot(Cycles after_period) const {
// Place Z80 accesses as the first six cycles in each sixteen-cycle window.
// That models video accesses as being the final ten. Which has the net effect
// of responding to the line parameter table interrupt flag as soon as it's
@ -100,7 +103,7 @@ Cycles Nick::get_time_until_z80_slot() const {
// i.e. 0 -> 0, 1 -> 15 ... 15 -> 1.
return Cycles(
15 ^ ((horizontal_counter_ + 15) & 15)
15 ^ ((horizontal_counter_ + 15 + after_period.as<int>()) & 15)
);
}

2
Machines/Enterprise/Nick.hpp
View File

@ -23,7 +23,7 @@ class Nick {
uint8_t read(uint16_t address);
void run_for(Cycles);
Cycles get_time_until_z80_slot() const;
Cycles get_time_until_z80_slot(Cycles after_period) const;
void set_scan_target(Outputs::Display::ScanTarget *scan_target);
Outputs::Display::ScanStatus get_scaled_scan_status() const;