mirror of
https://github.com/JorjBauer/aiie.git
synced 2024-09-11 01:56:59 +00:00
640 lines
18 KiB
C++
640 lines
18 KiB
C++
#include "diskii.h"
|
|
|
|
#ifdef TEENSYDUINO
|
|
#include <Arduino.h>
|
|
#else
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#endif
|
|
|
|
#include "applemmu.h" // for FLOATING
|
|
|
|
#include "globals.h"
|
|
#include "appleui.h"
|
|
|
|
#include "diskii-rom.h"
|
|
|
|
#define DISKIIMAGIC 0xAA
|
|
|
|
// how many CPU cycles do we wait to spin down the disk drive? 1023000 == 1 second
|
|
#define SPINDOWNDELAY (1023000)
|
|
|
|
DiskII::DiskII(AppleMMU *mmu)
|
|
{
|
|
this->mmu = mmu;
|
|
|
|
curPhase[0] = curPhase[1] = 0;
|
|
curHalfTrack[0] = curHalfTrack[1] = 0;
|
|
curWozTrack[0] = curWozTrack[1] = 0xFF;
|
|
|
|
writeMode = false;
|
|
writeProt = false; // FIXME: expose an interface to this
|
|
readWriteLatch = 0x00;
|
|
sequencer = 0;
|
|
dataRegister = 0;
|
|
driveSpinupCycles[0] = driveSpinupCycles[1] = 0;
|
|
deliveredDiskBits[0] = deliveredDiskBits[1] = 0;
|
|
|
|
disk[0] = disk[1] = NULL;
|
|
diskIsSpinningUntil[0] = diskIsSpinningUntil[1] = 0;
|
|
selectedDisk = 0;
|
|
}
|
|
|
|
DiskII::~DiskII()
|
|
{
|
|
}
|
|
|
|
bool DiskII::Serialize(int8_t fd)
|
|
{
|
|
return false;
|
|
|
|
// FIXME: all the new variables are missing ***
|
|
|
|
g_filemanager->writeByte(fd, DISKIIMAGIC);
|
|
|
|
g_filemanager->writeByte(fd, curHalfTrack[0]);
|
|
g_filemanager->writeByte(fd, curHalfTrack[1]);
|
|
|
|
g_filemanager->writeByte(fd, curPhase[0]);
|
|
g_filemanager->writeByte(fd, curPhase[1]);
|
|
|
|
g_filemanager->writeByte(fd, readWriteLatch);
|
|
g_filemanager->writeByte(fd, writeMode);
|
|
g_filemanager->writeByte(fd, writeProt);
|
|
|
|
for (int i=0; i<2; i++) {
|
|
if (disk[i]) {
|
|
g_filemanager->writeByte(fd, 1);
|
|
} else {
|
|
g_filemanager->writeByte(fd, 0);
|
|
}
|
|
if (!disk[i]->Serialize(fd))
|
|
return false;
|
|
}
|
|
|
|
g_filemanager->writeByte(fd,
|
|
(diskIsSpinningUntil[0] & 0xFF000000) >> 24);
|
|
g_filemanager->writeByte(fd,
|
|
(diskIsSpinningUntil[0] & 0x00FF0000) >> 16);
|
|
g_filemanager->writeByte(fd,
|
|
(diskIsSpinningUntil[0] & 0x0000FF00) >> 8);
|
|
g_filemanager->writeByte(fd,
|
|
(diskIsSpinningUntil[0] & 0x000000FF) );
|
|
|
|
g_filemanager->writeByte(fd,
|
|
(diskIsSpinningUntil[1] & 0xFF000000) >> 24);
|
|
g_filemanager->writeByte(fd,
|
|
(diskIsSpinningUntil[1] & 0x00FF0000) >> 16);
|
|
g_filemanager->writeByte(fd,
|
|
(diskIsSpinningUntil[1] & 0x0000FF00) >> 8);
|
|
g_filemanager->writeByte(fd,
|
|
(diskIsSpinningUntil[1] & 0x000000FF) );
|
|
|
|
|
|
g_filemanager->writeByte(fd, selectedDisk);
|
|
|
|
g_filemanager->writeByte(fd, DISKIIMAGIC);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool DiskII::Deserialize(int8_t fd)
|
|
{
|
|
return false;
|
|
// FIXME: all the new variables are missing ***
|
|
|
|
if (g_filemanager->readByte(fd) != DISKIIMAGIC) {
|
|
return false;
|
|
}
|
|
|
|
curHalfTrack[0] = g_filemanager->readByte(fd);
|
|
curHalfTrack[1] = g_filemanager->readByte(fd);
|
|
|
|
curPhase[0] = g_filemanager->readByte(fd);
|
|
curPhase[1] = g_filemanager->readByte(fd);
|
|
|
|
readWriteLatch = g_filemanager->readByte(fd);
|
|
writeMode = g_filemanager->readByte(fd);
|
|
writeProt = g_filemanager->readByte(fd);
|
|
|
|
for (int i=0; i<2; i++) {
|
|
if (disk[i])
|
|
delete disk[i];
|
|
if (g_filemanager->readByte(fd) == 1) {
|
|
disk[i] = new WozSerializer();
|
|
if (!disk[i]->Deserialize(fd))
|
|
return false;
|
|
} else {
|
|
disk[i] = NULL;
|
|
}
|
|
}
|
|
|
|
diskIsSpinningUntil[0] = g_filemanager->readByte(fd);
|
|
diskIsSpinningUntil[0] <<= 8;diskIsSpinningUntil[0] = g_filemanager->readByte(fd);
|
|
diskIsSpinningUntil[0] <<= 8;diskIsSpinningUntil[0] = g_filemanager->readByte(fd);
|
|
diskIsSpinningUntil[0] <<= 8;diskIsSpinningUntil[0] = g_filemanager->readByte(fd);
|
|
|
|
diskIsSpinningUntil[1] = g_filemanager->readByte(fd);
|
|
diskIsSpinningUntil[1] <<= 8;diskIsSpinningUntil[1] = g_filemanager->readByte(fd);
|
|
diskIsSpinningUntil[1] <<= 8;diskIsSpinningUntil[1] = g_filemanager->readByte(fd);
|
|
diskIsSpinningUntil[1] <<= 8;diskIsSpinningUntil[1] = g_filemanager->readByte(fd);
|
|
|
|
selectedDisk = g_filemanager->readByte(fd);
|
|
|
|
if (g_filemanager->readByte(fd) != DISKIIMAGIC) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void DiskII::Reset()
|
|
{
|
|
curPhase[0] = curPhase[1] = 0;
|
|
curHalfTrack[0] = curHalfTrack[1] = 0;
|
|
|
|
writeMode = false;
|
|
writeProt = false; // FIXME: expose an interface to this
|
|
readWriteLatch = 0x00;
|
|
|
|
ejectDisk(0);
|
|
ejectDisk(1);
|
|
}
|
|
|
|
void DiskII::driveOff()
|
|
{
|
|
diskIsSpinningUntil[selectedDisk] = g_cpu->cycles + SPINDOWNDELAY; // 1 second lag
|
|
if (diskIsSpinningUntil[selectedDisk] == -1 ||
|
|
diskIsSpinningUntil[selectedDisk] == 0)
|
|
diskIsSpinningUntil[selectedDisk] = 2; // fudge magic numbers; 0 is "off" and -1 is "forever".
|
|
|
|
// The drive-is-on-indicator is turned off later, when the disk
|
|
// actually spins down.
|
|
}
|
|
|
|
void DiskII::driveOn()
|
|
{
|
|
if (diskIsSpinningUntil[selectedDisk] != -1) {
|
|
// If the drive isn't already spinning, then start keeping track of how
|
|
// many bits we've delivered (so we can honor the disk bit-delivery time
|
|
// that might be in the Woz disk image).
|
|
driveSpinupCycles[selectedDisk] = g_cpu->cycles;
|
|
deliveredDiskBits[selectedDisk] = 0;
|
|
diskIsSpinningUntil[selectedDisk] = -1; // magic "forever"
|
|
}
|
|
// FIXME: does the sequencer get reset? Maybe if it's the selected disk? Or no?
|
|
// sequencer = 0;
|
|
|
|
g_ui->drawOnOffUIElement(UIeDisk1_activity + selectedDisk, true); // FIXME: do we really want to update the UI from inside this thread?
|
|
}
|
|
|
|
uint8_t DiskII::readSwitches(uint8_t s)
|
|
{
|
|
switch (s) {
|
|
case 0x00: // change stepper motor phase
|
|
break;
|
|
case 0x01:
|
|
setPhase(0);
|
|
break;
|
|
case 0x02:
|
|
break;
|
|
case 0x03:
|
|
setPhase(1);
|
|
break;
|
|
case 0x04:
|
|
break;
|
|
case 0x05:
|
|
setPhase(2);
|
|
break;
|
|
case 0x06: // 3 off
|
|
break;
|
|
case 0x07: // 3 on
|
|
setPhase(3);
|
|
break;
|
|
|
|
case 0x08: // drive off
|
|
driveOff();
|
|
break;
|
|
case 0x09: // drive on
|
|
driveOn();
|
|
break;
|
|
|
|
case 0x0A: // select drive 1
|
|
select(0);
|
|
break;
|
|
case 0x0B: // select drive 2
|
|
select(1);
|
|
break;
|
|
|
|
case 0x0C: // shift one read or write byte
|
|
readWriteLatch = readOrWriteByte();
|
|
if (readWriteLatch & 0x80) {
|
|
// static uint32_t lastC = 0;
|
|
// printf("%u: read data\n", g_cpu->cycles - lastC);
|
|
// lastC = g_cpu->cycles;
|
|
if (!(sequencer & 0x80)) {
|
|
printf("SEQ RESET EARLY [1]\n");
|
|
}
|
|
sequencer = 0;
|
|
}
|
|
break;
|
|
|
|
case 0x0D: // load data register (latch)
|
|
// This is complex and incomplete. cf. Logic State Sequencer,
|
|
// UTA2E, p. 9-14
|
|
if (!writeMode) {
|
|
if (isWriteProtected())
|
|
readWriteLatch |= 0x80;
|
|
else
|
|
readWriteLatch &= 0x7F;
|
|
}
|
|
if (!(sequencer & 0x80)) {
|
|
printf("SEQ RESET EARLY [2]\n");
|
|
}
|
|
sequencer = 0;
|
|
break;
|
|
|
|
case 0x0E: // set read mode
|
|
setWriteMode(false);
|
|
break;
|
|
case 0x0F: // set write mode
|
|
setWriteMode(true);
|
|
break;
|
|
}
|
|
|
|
// Any even address read returns the readWriteLatch (UTA2E Table 9.1,
|
|
// p. 9-12, note 2)
|
|
return (s & 1) ? FLOATING : readWriteLatch;
|
|
}
|
|
|
|
void DiskII::writeSwitches(uint8_t s, uint8_t v)
|
|
{
|
|
switch (s) {
|
|
case 0x00: // change stepper motor phase
|
|
break;
|
|
case 0x01:
|
|
setPhase(0);
|
|
break;
|
|
case 0x02:
|
|
break;
|
|
case 0x03:
|
|
setPhase(1);
|
|
break;
|
|
case 0x04:
|
|
break;
|
|
case 0x05:
|
|
setPhase(2);
|
|
break;
|
|
case 0x06: // 3 off
|
|
break;
|
|
case 0x07: // 3 on
|
|
setPhase(3);
|
|
break;
|
|
|
|
case 0x08: // drive off
|
|
driveOff();
|
|
break;
|
|
case 0x09: // drive on
|
|
driveOn();
|
|
break;
|
|
|
|
case 0x0A: // select drive 1
|
|
select(0);
|
|
break;
|
|
case 0x0B: // select drive 2
|
|
select(1);
|
|
break;
|
|
|
|
case 0x0C: // shift one read or write byte
|
|
if (readOrWriteByte() & 0x80) {
|
|
if (!(sequencer & 0x80)) {
|
|
printf("SEQ RESET EARLY [3]\n");
|
|
}
|
|
sequencer = 0;
|
|
}
|
|
break;
|
|
|
|
case 0x0D: // drive write
|
|
// FIXME
|
|
break;
|
|
|
|
case 0x0E: // set read mode
|
|
setWriteMode(false);
|
|
break;
|
|
|
|
case 0x0F: // set write mode
|
|
setWriteMode(true);
|
|
break;
|
|
}
|
|
|
|
// All writes update the latch
|
|
if (writeMode) {
|
|
readWriteLatch = v;
|
|
}
|
|
}
|
|
|
|
/* The Disk ][ has a stepper motor that moves the head across the tracks.
|
|
* Switches 0-7 turn off and on the four different magnet phases; pulsing
|
|
* from (e.g.) phase 0 to phase 1 makes the motor move up a track, and
|
|
* (e.g.) phase 1 to phase 0 makes the motor move down a track.
|
|
*
|
|
* Except that's not quite true: the stepper actually moves the head a
|
|
* _half_ track.
|
|
*
|
|
* This is a very simplified version of the stepper motor code. In theory,
|
|
* we should keep track of all 4 phase magnets; and then only move up or down
|
|
* a half track when two adjacent motors are on (not three adjacent motors;
|
|
* and not two opposite motors). But that physical characteristic isn't
|
|
* important for most diskettes, and our image formats aren't likely to
|
|
* be able to provide appropriate half-track data to the programs that played
|
|
* tricks with these half-tracks (for copy protection or whatever).
|
|
*
|
|
* This setPhase is only called when turning *on* a phase. It's assumed that
|
|
* something is turning *off* the phases correctly; and that the combination
|
|
* of the previous phase that was on and the current phase that's being turned
|
|
* on are reliable enough to determine direction.
|
|
*
|
|
* The _phase_delta array is four sets of offsets - one for each
|
|
* current phase, detailing what the step will be given the next
|
|
* phase. This kind of emulates the messiness of going from phase 0
|
|
* to 2 -- it's going to move forward two half-steps -- but then doing
|
|
* the same thing again is just going to move you back two half-steps...
|
|
*
|
|
*/
|
|
|
|
void DiskII::setPhase(uint8_t phase)
|
|
{
|
|
const int8_t _phase_delta[16] = { 0, 1, 2, -1, // prev phase 0 -> 0/1/2/3
|
|
-1, 0, 1, 2, // prev phase 1 -> 0/1/2/3
|
|
-2, -1, 0, 1, // prev phase 2 -> 0/1/2/3
|
|
1, -2, -1, 0 // prev phase 3 -> 0/1/2/3
|
|
};
|
|
|
|
int8_t prevPhase = curPhase[selectedDisk];
|
|
int8_t prevHalfTrack = curHalfTrack[selectedDisk];
|
|
|
|
|
|
curHalfTrack[selectedDisk] += _phase_delta[(prevPhase * 4) + phase];
|
|
curPhase[selectedDisk] = phase;
|
|
|
|
// Cap at 35 tracks (a normal disk size). Some drives let you go farther,
|
|
// and we could support that by increasing this limit - but the images
|
|
// would be different too, so there would be more work to abstract out...
|
|
if (curHalfTrack[selectedDisk] > 35 * 2 - 1) {
|
|
curHalfTrack[selectedDisk] = 35 * 2 - 1;
|
|
}
|
|
|
|
// Don't go past the innermost track, of course.
|
|
if (curHalfTrack[selectedDisk] < 0) {
|
|
curHalfTrack[selectedDisk] = 0;
|
|
// recalibrate! This is where the fun noise goes DaDaDaDaDaDaDaDaDa
|
|
}
|
|
|
|
if (curHalfTrack[selectedDisk] != prevHalfTrack) {
|
|
// We're changing track - flush the old track back to disk
|
|
// FIXME flush
|
|
curWozTrack[selectedDisk] = disk[selectedDisk]->dataTrackNumberForQuarterTrack(curHalfTrack[selectedDisk]*2);
|
|
}
|
|
}
|
|
|
|
bool DiskII::isWriteProtected()
|
|
{
|
|
return (writeProt ? 0xFF : 0x00);
|
|
}
|
|
|
|
void DiskII::setWriteMode(bool enable)
|
|
{
|
|
writeMode = enable;
|
|
}
|
|
|
|
static uint8_t _lc(char c)
|
|
{
|
|
if (c >= 'A' && c <= 'Z') {
|
|
c = c - 'A' + 'a';
|
|
}
|
|
return c;
|
|
}
|
|
|
|
static bool _endsWithI(const char *s1, const char *s2)
|
|
{
|
|
if (strlen(s2) > strlen(s1)) {
|
|
return false;
|
|
}
|
|
|
|
const char *p = &s1[strlen(s1)-1];
|
|
int16_t l = strlen(s2)-1;
|
|
while (l >= 0) {
|
|
if (_lc(*p--) != _lc(s2[l]))
|
|
return false;
|
|
l--;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void DiskII::insertDisk(int8_t driveNum, const char *filename, bool drawIt)
|
|
{
|
|
ejectDisk(driveNum);
|
|
|
|
disk[driveNum] = new WozSerializer();
|
|
disk[driveNum]->readFile(filename, true, T_AUTO); // FIXME error checking; also FIXME the true is 'preload all tracks' and that won't work on the teensy
|
|
|
|
curWozTrack[driveNum] = disk[driveNum]->dataTrackNumberForQuarterTrack(curHalfTrack[driveNum]*2);
|
|
|
|
if (drawIt)
|
|
g_ui->drawOnOffUIElement(UIeDisk1_state + driveNum, false);
|
|
}
|
|
|
|
void DiskII::ejectDisk(int8_t driveNum)
|
|
{
|
|
if (disk[driveNum]) {
|
|
delete disk[driveNum];
|
|
disk[driveNum] = NULL;
|
|
g_ui->drawOnOffUIElement(UIeDisk1_state + driveNum, true);
|
|
}
|
|
}
|
|
|
|
void DiskII::select(int8_t which)
|
|
{
|
|
if (which != 0 && which != 1)
|
|
return;
|
|
|
|
if (which != selectedDisk) {
|
|
if (diskIsSpinningUntil[selectedDisk] == -1) {
|
|
// FIXME: I'm not sure what the right behavior is here (read
|
|
// UTA2E and see if the state diagrams show the right
|
|
// behavior). For now, I'm setting the spindown of the
|
|
// now-deselected disk.
|
|
diskIsSpinningUntil[selectedDisk] = g_cpu->cycles + SPINDOWNDELAY;
|
|
if (diskIsSpinningUntil[selectedDisk] == -1 ||
|
|
diskIsSpinningUntil[selectedDisk] == 0)
|
|
diskIsSpinningUntil[selectedDisk] = 2; // fudge magic numbers; 0 is "off" and -1 is "forever".
|
|
}
|
|
|
|
// Flush the cache of the disk that's no longer selected
|
|
if (disk[selectedDisk])
|
|
disk[selectedDisk]->flush();
|
|
|
|
// set the selected disk drive
|
|
selectedDisk = which;
|
|
}
|
|
|
|
// Update the current woz track for the given disk drive
|
|
if (disk[selectedDisk]) {
|
|
curWozTrack[selectedDisk] =
|
|
disk[selectedDisk]->dataTrackNumberForQuarterTrack(curHalfTrack[selectedDisk]*2);
|
|
}
|
|
}
|
|
|
|
uint8_t DiskII::readOrWriteByte()
|
|
{
|
|
if (!disk[selectedDisk]) {
|
|
//printf("reading from uninserted disk\n");
|
|
return 0xFF;
|
|
}
|
|
|
|
uint32_t curCycles = g_cpu->cycles;
|
|
|
|
// FIXME: for writes, we need to check s/t like ... if (diskIsSpinningUntil[selectedDisk] >= curCycles) { return } ...
|
|
|
|
if (writeMode && !writeProt) {
|
|
// It's a write request. Inject 'readWriteLatch'.
|
|
disk[selectedDisk]->writeNextWozByte(curWozTrack[selectedDisk], readWriteLatch);
|
|
goto done;
|
|
}
|
|
|
|
if (diskIsSpinningUntil[selectedDisk] >= curCycles) {
|
|
|
|
// Figure out how many cycles we missed since the last disk read,
|
|
// and pop the right number of bits off the woz track.
|
|
|
|
// Handle rollover, which is a mess.
|
|
if (driveSpinupCycles[selectedDisk] > g_cpu->cycles) {
|
|
printf("Cycle rollover\n");
|
|
driveSpinupCycles[selectedDisk] = g_cpu->cycles-1; // FIXME: is the -1 correct? What if we were @ 0?
|
|
#ifndef TEENSYDUINO
|
|
exit(2); // for debugging, FIXME ***
|
|
#endif
|
|
}
|
|
|
|
uint32_t cyclesPassed = g_cpu->cycles - driveSpinupCycles[selectedDisk];
|
|
// FIXME: this is a bit of a magic constant, which makes the drive
|
|
// test in Copy2+ at 179.4ms per revolution (334.4rpm). I'd like to
|
|
// understand that better and get to to the proper 200ms (300rpm).
|
|
uint64_t expectedDiskBits = (float) cyclesPassed / 3.51;
|
|
int64_t bitsToDeliver = expectedDiskBits - deliveredDiskBits[selectedDisk];
|
|
|
|
if (bitsToDeliver > 0) {
|
|
// We're expected to deliver some bits to the Disk II sequencer.
|
|
// Instead of piecemeal delivering a small number of bits (which we
|
|
// could do, but it's kinda busywork) - instead, we'll do one of two
|
|
// possible things.
|
|
//
|
|
// The first: if we're expecting a small number of bits to be delivered,
|
|
// then we'll grab the next byte from the nibble stream and return it.
|
|
// This itself has three possible cases -
|
|
// (a) we should be delivering less than a full byte, but we're
|
|
// actually going to deliver a full byte. bitsToDeliver will
|
|
// become negative, because we're delivering these too early.
|
|
// The next call will probably see that it has nothing to deliver
|
|
// and, as long as the disk image we're using doesn't have a
|
|
// really fine tolerance on the delivery rate of the bits,
|
|
// it will all come out in the wash.
|
|
// (b) we should be delivering exactly a byte, and we're doing the
|
|
// absolute right thing.
|
|
// (c) we are more than 1 byte, but less than 2 bytes, behind. If
|
|
// this is the case, we're probably making up for a timing
|
|
// problem in this code - where the bits would now have been
|
|
// lost. By returning the first byte that we found, we're hoping
|
|
// that the next call will be closer to on time, and we will
|
|
// eventually catch back up to the stream. Hopefully this makes
|
|
// the stream a little more resilient - and the error isn't
|
|
// so far off that the reader notices something is weird on the
|
|
// timing. (Standard RWTS doesn't, but some copy protection
|
|
// might.)
|
|
if (bitsToDeliver < 16) {
|
|
while (bitsToDeliver > -16 && ((sequencer & 0x80) == 0)) {
|
|
sequencer <<= 1;
|
|
sequencer |= disk[selectedDisk]->nextDiskBit(curWozTrack[selectedDisk]);
|
|
bitsToDeliver--;
|
|
deliveredDiskBits[selectedDisk]++;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
// If we reach here, we're throwing away a bunch of missed data.
|
|
// This might be normal (where the machine wasn't listening for the data),
|
|
// or it might be exceptional (something wrong with the tuning of data
|
|
// delivery, based on the magic constant in expectedDiskBits above)...
|
|
deliveredDiskBits[selectedDisk] += bitsToDeliver;
|
|
while (bitsToDeliver) {
|
|
sequencer <<= 1;
|
|
sequencer |= disk[selectedDisk]->nextDiskBit(curWozTrack[selectedDisk]);
|
|
bitsToDeliver--;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
done:
|
|
return sequencer;
|
|
}
|
|
|
|
const char *DiskII::DiskName(int8_t num)
|
|
{
|
|
if (disk[num]) {
|
|
// *** need to get name from disk image FIXME
|
|
return "[inserted]";
|
|
}
|
|
|
|
// Nothing inserted in that drive
|
|
return "";
|
|
}
|
|
|
|
void DiskII::loadROM(uint8_t *toWhere)
|
|
{
|
|
#ifdef TEENSYDUINO
|
|
Serial.println("loading DiskII rom");
|
|
for (uint16_t i=0; i<=0xFF; i++) {
|
|
toWhere[i] = pgm_read_byte(&romData[i]);
|
|
}
|
|
#else
|
|
printf("loading DiskII rom\n");
|
|
memcpy(toWhere, romData, 256);
|
|
#endif
|
|
}
|
|
|
|
void DiskII::flushTrack(int8_t track, int8_t sel)
|
|
{
|
|
// safety check: if we're write-protected, then how did we get here?
|
|
if (writeProt) {
|
|
g_display->debugMsg("DII: Write Protected");
|
|
return;
|
|
}
|
|
|
|
// FIXME: *** needs implementing
|
|
}
|
|
|
|
void DiskII::maintenance(uint32_t cycle)
|
|
{
|
|
// Handle spin-down for the drive. Drives stay on for a second after
|
|
// the stop was noticed.
|
|
for (int i=0; i<2; i++) {
|
|
if (diskIsSpinningUntil[i] &&
|
|
g_cpu->cycles > diskIsSpinningUntil[i]) {
|
|
// Stop the given disk drive spinning
|
|
diskIsSpinningUntil[i] = 0;
|
|
// FIXME: consume any disk bits that need to be consumed, and spin it down
|
|
|
|
if (disk[i]) {
|
|
// ensure any changes are written to our disk image
|
|
disk[i]->flush();
|
|
}
|
|
|
|
g_ui->drawOnOffUIElement(UIeDisk1_activity + i, false); // FIXME: queue for later drawing?
|
|
}
|
|
}
|
|
}
|