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Implements write support out of the Disk II.

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This commit is contained in:
Thomas Harte 2018-05-18 22:07:58 -04:00
parent 7b7beb13a3
commit ed06533e60
2 changed files with 22 additions and 6 deletions
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25
Components/DiskII/DiskII.cpp
View File

@ -104,6 +104,13 @@ void DiskII::run_for(const Cycles cycles) {
case 0xb: shift_register_ = data_input_; break; // load data register from data bus
}
// Currently writing?
if(inputs_&input_mode) {
// state_ & 0x80 should be the current level sent to the disk;
// therefore transitions in that bit should become flux transitions
drives_[active_drive_].write_bit(!!((state_ ^ address) & 0x80));
}
// TODO: surely there's a less heavyweight solution than this?
if(!drive_is_sleeping_[0]) drives_[0].run_for(Cycles(1));
if(!drive_is_sleeping_[1]) drives_[1].run_for(Cycles(1));
@ -135,9 +142,9 @@ void DiskII::set_state_machine(const std::vector<uint8_t> &state_machine) {
state b0, state b2, state b3, pulse, Q7, Q6, shift, state b1
... and has the top nibble reflected. Beneath Apple Pro-DOS uses a
different order and several of the online copies are reformatted
into that order.
... and has the top nibble of each value stored in the ROM reflected.
Beneath Apple Pro-DOS uses a different order and several of the
online copies are reformatted into that order.
So the code below remaps into Beneath Apple Pro-DOS order if the
supplied state machine isn't already in that order.
@ -221,8 +228,16 @@ int DiskII::read_address(int address) {
case 0xc: inputs_ &= ~input_command; break;
case 0xd: inputs_ |= input_command; break;
case 0xe: inputs_ &= ~input_mode; break;
case 0xf: inputs_ |= input_mode; break;
case 0xe:
if(inputs_ & input_mode)
drives_[active_drive_].end_writing();
inputs_ &= ~input_mode;
break;
case 0xf:
if(!(inputs_ & input_mode))
drives_[active_drive_].begin_writing(Storage::Time(1, 2045454), false);
inputs_ |= input_mode;
break;
}
set_controller_can_sleep();
return (address & 1) ? 0xff : shift_register_;

3
Storage/Disk/Track/PCMPatchedTrack.cpp
View File

@ -202,7 +202,8 @@ Storage::Time PCMPatchedTrack::seek_to(const Time &time_since_index_hole) {
else
current_time_ = underlying_track_->seek_to(time_since_index_hole);
assert(current_time_ <= time_since_index_hole);
// The assert below is disabled as it assumes too much about total precision.
// assert(current_time_ <= time_since_index_hole);
return current_time_;
}