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Slightly updated comments, switched to 1540 ROM so as very slightly to improve loading time.

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This commit is contained in:
Thomas Harte 2016-08-01 04:37:30 -04:00
parent b43a7381ae
commit 18744cd98b
2 changed files with 9 additions and 13 deletions
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20
Machines/Commodore/1540/C1540.hpp
View File

@ -101,11 +101,11 @@ class SerialPortVIA: public MOS::MOS6522<SerialPortVIA>, public MOS::MOS6522IRQD
An implementation of the drive VIA in a Commodore 1540 — the VIA that is used to interface with the disk.
It is wired up such that Port B contains:
Bits 0/1: head step direction (TODO)
Bit 2: motor control (TODO)
Bits 0/1: head step direction
Bit 2: motor control
Bit 3: LED control (TODO)
Bit 4: write protect photocell status (TODO)
Bits 5/6: write density (TODO)
Bits 5/6: read/write density
Bit 7: 0 if sync marks are currently being detected, 1 otherwise.
... and Port A contains the byte most recently read from the disk or the byte next to write to the disk, depending on data direction.
@ -159,24 +159,25 @@ class DriveVIA: public MOS::MOS6522<DriveVIA>, public MOS::MOS6522IRQDelegate {
void set_port_output(Port port, uint8_t value, uint8_t direction_mask) {
if(port)
{
// record drive motor state
_drive_motor = !!(value&4);
// if(value&4)
// {
// check for a head step
int step_difference = ((value&3) - (_previous_port_b_output&3))&3;
if(step_difference)
{
if(_delegate) _delegate->drive_via_did_step_head(this, (step_difference == 1) ? 1 : -1);
}
// check for a change in density
int density_difference = (_previous_port_b_output^value) & (3 << 5);
if(density_difference && _delegate)
{
_delegate->drive_via_did_set_data_density(this, (value >> 5)&3);
}
// TODO: something with the drive LED
// printf("LED: %s\n", value&8 ? "On" : "Off");
// printf("Density: %d\n", (value >> 5)&3);
// }
_previous_port_b_output = value;
}
@ -230,11 +231,6 @@ class Machine:
*/
void set_serial_bus(std::shared_ptr<::Commodore::Serial::Bus> serial_bus);
/*!
Sets the disk from which this 1540 is reading data.
*/
// void set_disk(std::shared_ptr<Storage::Disk> disk);
void run_for_cycles(int number_of_cycles);
// to satisfy CPU6502::Processor

2
OSBindings/Mac/Clock Signal/Documents/Vic20Document.swift
View File

@ -32,7 +32,7 @@ class Vic20Document: MachineDocument {
vic20.setCharactersROM(characters)
}
if let drive = dataForResource("1541", ofType: "bin", inDirectory: "ROMImages/Commodore1540") {
if let drive = dataForResource("1540", ofType: "bin", inDirectory: "ROMImages/Commodore1540") {
vic20.setDriveROM(drive)
}
}