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Adds putative support for PlusToo-style BIN files.

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Albeit a bit of a guess, since it's not intended to be an emulator file format.
This commit is contained in:
Thomas Harte
2019-06-04 21:41:09 -04:00
parent 058fe3e986
commit b8a1553368
7 changed files with 150 additions and 31 deletions
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Components/DiskII/IWM.cpp
+26 -15
View File
@@ -25,11 +25,7 @@ namespace {
}
IWM::IWM(int clock_rate) :
clock_rate_(clock_rate),
drives_{
{static_cast<unsigned int>(clock_rate), 300, 2},
{static_cast<unsigned int>(clock_rate), 300, 2}
} {}
clock_rate_(clock_rate) {}
// MARK: - Bus accessors
@@ -64,7 +60,7 @@ uint8_t IWM::read(int address) {
case ENABLE: /* Read data register. */
printf("Reading data register\n");
return 0xff;
return 0x00;
case Q6: case Q6|ENABLE: {
/*
@@ -93,7 +89,7 @@ uint8_t IWM::read(int address) {
case SEL: // Disk in place.
printf("disk in place)\n");
sense = drives_[active_drive_].has_disk() ? 0x00 : 0x80;
sense = drives_[active_drive_] && drives_[active_drive_]->has_disk() ? 0x00 : 0x80;
break;
case CA0: // Disk head stepping.
@@ -106,12 +102,12 @@ uint8_t IWM::read(int address) {
case CA1: // Disk motor running.
printf("disk motor running)\n");
sense = drives_[active_drive_].get_motor_on() ? 0x00 : 0x80;
sense = drives_[active_drive_] && drives_[active_drive_]->get_motor_on() ? 0x00 : 0x80;
break;
case CA1|SEL: // Head at track 0.
printf("head at track 0)\n");
sense = drives_[active_drive_].get_is_track_zero() ? 0x00 : 0x80;
sense = drives_[active_drive_] && drives_[active_drive_]->get_is_track_zero() ? 0x00 : 0x80;
break;
case CA1|CA0|SEL: // Tachometer (?)
@@ -132,12 +128,13 @@ uint8_t IWM::read(int address) {
case CA2|CA1|CA0|SEL: // Drive installed.
printf("drive installed)\n");
sense = drives_[active_drive_] ? 0x00 : 0x80;
break;
}
return
(mode_&0x1f) |
(drives_[active_drive_].get_motor_on() ? 0x20 : 0x00) |
(drive_motor_on_ ? 0x20 : 0x00) |
sense;
} break;
@@ -214,13 +211,15 @@ void IWM::access(int address) {
case 4:
if(address & 1) {
drives_[active_drive_].set_motor_on(true);
drive_motor_on_ = true;
if(drives_[active_drive_]) drives_[active_drive_]->set_motor_on(true);
} else {
// If the 1-second delay is enabled, set up a timer for that.
if(!(mode_ & 4)) {
cycles_until_motor_off_ = Cycles(clock_rate_);
} else {
drives_[active_drive_].set_motor_on(false);
drive_motor_on_ = false;
if(drives_[active_drive_]) drives_[active_drive_]->set_motor_on(false);
}
}
break;
@@ -228,9 +227,9 @@ void IWM::access(int address) {
case 5: {
const int new_drive = address & 1;
if(new_drive != active_drive_) {
drives_[new_drive].set_motor_on(drives_[active_drive_].get_motor_on());
drives_[active_drive_].set_motor_on(false);
if(drives_[active_drive_]) drives_[active_drive_]->set_motor_on(false);
active_drive_ = new_drive;
if(drives_[active_drive_]) drives_[active_drive_]->set_motor_on(drive_motor_on_);
}
} break;
}
@@ -247,10 +246,22 @@ void IWM::set_select(bool enabled) {
// MARK: - Active logic
void IWM::run_for(const Cycles cycles) {
// Check for a timeout of the motor-off timer.
if(cycles_until_motor_off_ > Cycles(0)) {
cycles_until_motor_off_ -= cycles;
if(cycles_until_motor_off_ <= Cycles(0)) {
drives_[active_drive_].set_motor_on(false);
drive_motor_on_ = false;
if(drives_[active_drive_])
drives_[active_drive_]->set_motor_on(false);
}
}
// Activity otherwise depends on mode and motor state.
switch(state_ & (Q6 | Q7 | ENABLE)) {
}
}
void IWM::set_drive(int slot, Storage::Disk::Drive *drive) {
drives_[slot] = drive;
}
Components/DiskII/IWM.hpp
+5 -1
View File
@@ -38,6 +38,9 @@ class IWM {
/// Advances the controller by @c cycles.
void run_for(const Cycles cycles);
/// Connects a drive to the IWM.
void set_drive(int slot, Storage::Disk::Drive *drive);
private:
const int clock_rate_;
@@ -48,7 +51,8 @@ class IWM {
int state_ = 0;
int active_drive_ = 0;
Storage::Disk::Drive drives_[2];
Storage::Disk::Drive *drives_[2] = {nullptr, nullptr};
bool drive_motor_on_ = false;
Cycles cycles_until_motor_off_;