mirror of
https://github.com/JorjBauer/aiie.git
synced 2024-11-29 16:49:26 +00:00
471 lines
10 KiB
C++
471 lines
10 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 "diskii-rom.h"
|
|
|
|
DiskII::DiskII(AppleMMU *mmu)
|
|
{
|
|
this->trackBuffer = new RingBuffer(NIBTRACKSIZE);
|
|
this->rawTrackBuffer = (uint8_t *)malloc(4096);
|
|
|
|
this->mmu = mmu;
|
|
|
|
curTrack = 0;
|
|
trackDirty = false;
|
|
|
|
writeMode = false;
|
|
writeProt = false; // FIXME: expose an interface to this
|
|
writeLatch = 0x00;
|
|
|
|
disk[0] = disk[1] = -1;
|
|
indicatorIsOn[0] = indicatorIsOn[1] = 0;
|
|
selectedDisk = 0;
|
|
diskType[0] = diskType[1] = dosDisk;
|
|
}
|
|
|
|
DiskII::~DiskII()
|
|
{
|
|
delete this->trackBuffer; this->trackBuffer = NULL;
|
|
free(this->rawTrackBuffer); this->rawTrackBuffer = NULL;
|
|
}
|
|
|
|
void DiskII::Reset()
|
|
{
|
|
curTrack = 0;
|
|
trackDirty = false;
|
|
|
|
writeMode = false;
|
|
writeProt = false; // FIXME: expose an interface to this
|
|
writeLatch = 0x00;
|
|
|
|
ejectDisk(0);
|
|
ejectDisk(1);
|
|
}
|
|
|
|
uint8_t DiskII::readSwitches(uint8_t s)
|
|
{
|
|
switch (s) {
|
|
case 0x00: // change stepper motor phase
|
|
case 0x01:
|
|
case 0x02:
|
|
case 0x03:
|
|
case 0x04:
|
|
case 0x05:
|
|
case 0x06:
|
|
case 0x07:
|
|
step(s);
|
|
break;
|
|
|
|
case 0x08: // drive off
|
|
indicatorIsOn[selectedDisk] = 99;
|
|
g_display->drawDriveStatus(selectedDisk, false);
|
|
flushTrack();
|
|
break;
|
|
case 0x09: // drive on
|
|
indicatorIsOn[selectedDisk] = 100;
|
|
g_display->drawDriveStatus(selectedDisk, true);
|
|
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
|
|
writeLatch = readOrWriteByte();
|
|
break;
|
|
|
|
case 0x0D: // load data register (latch)
|
|
// This is complex and incomplete. cf. Logic State Sequencer,
|
|
// UTA2E, p. 9-14
|
|
if (!writeMode && indicatorIsOn[selectedDisk]) {
|
|
if (isWriteProtected())
|
|
writeLatch |= 0x80;
|
|
else
|
|
writeLatch &= 0x7F;
|
|
}
|
|
break;
|
|
|
|
case 0x0E: // set read mode
|
|
setWriteMode(false);
|
|
|
|
// FIXME: with this shortcut here, disk access speeds up ridiculously.
|
|
// Is this breaking anything?
|
|
return ( (readOrWriteByte() & 0x7F) |
|
|
(isWriteProtected() ? 0x80 : 0x00) );
|
|
|
|
break;
|
|
case 0x0F: // set write mode
|
|
setWriteMode(true);
|
|
break;
|
|
}
|
|
|
|
// FIXME: improve the spin-down here. We need a CPU cycle callback
|
|
// for some period of time instead of this silly decrement counter.
|
|
if (!indicatorIsOn[selectedDisk]) {
|
|
// printf("Unexpected read while disk isn't on?\n");
|
|
indicatorIsOn[selectedDisk] = 100;
|
|
g_display->drawDriveStatus(selectedDisk, true);
|
|
}
|
|
if (indicatorIsOn[selectedDisk] > 0 && indicatorIsOn[selectedDisk] < 100) {
|
|
indicatorIsOn[selectedDisk]--;
|
|
// slowly spin it down...
|
|
}
|
|
|
|
// Any even address read returns the writeLatch (UTA2E Table 9.1,
|
|
// p. 9-12, note 2)
|
|
return (s & 1) ? FLOATING : writeLatch;
|
|
}
|
|
|
|
void DiskII::writeSwitches(uint8_t s, uint8_t v)
|
|
{
|
|
switch (s) {
|
|
case 0x00: // change stepper motor phase
|
|
case 0x01:
|
|
case 0x02:
|
|
case 0x03:
|
|
case 0x04:
|
|
case 0x05:
|
|
case 0x06:
|
|
case 0x07:
|
|
step(s);
|
|
break;
|
|
|
|
case 0x08: // drive off
|
|
break;
|
|
case 0x09: // drive on
|
|
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
|
|
readOrWriteByte();
|
|
break;
|
|
|
|
case 0x0D: // drive write
|
|
break;
|
|
|
|
case 0x0E: // set read mode
|
|
setWriteMode(false);
|
|
break;
|
|
|
|
case 0x0F: // set write mode
|
|
setWriteMode(true);
|
|
break;
|
|
}
|
|
|
|
// All writes update the latch
|
|
if (writeMode) {
|
|
writeLatch = v;
|
|
}
|
|
}
|
|
|
|
// where phase is the address poked & 0x07 (e.g. "0xC0E0 & 0x07")
|
|
void DiskII::step(uint8_t phase)
|
|
{
|
|
static int mag[4] = { 0,0,0,0 };
|
|
static int pmag[4] = { 0, 0, 0, 0 };
|
|
static int ppmag[4] = { 0, 0, 0, 0 };
|
|
static int pnum = 0;
|
|
static int ppnum = 0;
|
|
static int trackPos = 0;
|
|
static int prevTrack = 0;
|
|
|
|
// phase &= 7;
|
|
int magnet_number = phase >> 1;
|
|
|
|
// shuffle data down
|
|
ppmag[ppnum] = pmag[ppnum];
|
|
ppnum = pnum;
|
|
pmag[pnum] = mag[pnum];
|
|
pnum = magnet_number;
|
|
|
|
if ((phase & 1) == 0) {
|
|
mag[magnet_number] = 0;
|
|
} else {
|
|
if (ppmag[(magnet_number + 1) & 3]) {
|
|
if (--trackPos < 0) {
|
|
trackPos = 0;
|
|
// recalibrate...
|
|
}
|
|
}
|
|
|
|
if (ppmag[(magnet_number - 1) & 3]) {
|
|
// FIXME: don't go beyond the end of the media. For a 35-track disk, that's 68 == ((35-1) * 2).
|
|
if (++trackPos > 68) {
|
|
trackPos = 68;
|
|
}
|
|
}
|
|
mag[magnet_number] = 1;
|
|
}
|
|
|
|
curTrack = (trackPos + 1) / 2;
|
|
if (curTrack != prevTrack) {
|
|
// We're about to change tracks - be sure to flush the track if we've written to it
|
|
if (trackDirty) {
|
|
flushTrack();
|
|
}
|
|
// step to the appropriate track
|
|
trackDirty = false;
|
|
prevTrack = curTrack;
|
|
trackBuffer->clear();
|
|
}
|
|
}
|
|
|
|
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] = g_filemanager->openFile(filename);
|
|
if (drawIt)
|
|
g_display->drawDriveDoor(driveNum, false);
|
|
|
|
if (_endsWithI(filename, ".nib")) {
|
|
diskType[driveNum] = nibDisk;
|
|
} else if (_endsWithI(filename, ".po")) {
|
|
diskType[driveNum] = prodosDisk;
|
|
} else {
|
|
diskType[driveNum] = dosDisk;
|
|
#ifndef TEENSYDUINO
|
|
// debugging: make a nib copy of the image to play with
|
|
// convertDskToNib("/tmp/debug.nib");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void DiskII::ejectDisk(int8_t driveNum)
|
|
{
|
|
if (disk[driveNum] != -1) {
|
|
g_filemanager->closeFile(disk[driveNum]);
|
|
disk[driveNum] = -1;
|
|
g_display->drawDriveDoor(driveNum, true);
|
|
}
|
|
}
|
|
|
|
void DiskII::select(int8_t which)
|
|
{
|
|
if (which != 0 && which != 1)
|
|
return;
|
|
|
|
if (which != selectedDisk) {
|
|
indicatorIsOn[selectedDisk] = 0;
|
|
g_display->drawDriveStatus(selectedDisk, false);
|
|
|
|
flushTrack(); // in case it's dirty: flush before changing drives
|
|
trackBuffer->clear();
|
|
}
|
|
|
|
// set the selected disk drive
|
|
selectedDisk = which;
|
|
}
|
|
|
|
uint8_t DiskII::readOrWriteByte()
|
|
{
|
|
if (disk[selectedDisk] == -1) {
|
|
// printf("NO DISK\n");
|
|
return GAP;
|
|
}
|
|
|
|
if (writeMode && !writeProt) {
|
|
|
|
if (!trackBuffer->hasData()) {
|
|
// printf("some sort of error happened - trying to write to uninitialized track?\n");
|
|
return 0;
|
|
}
|
|
|
|
trackDirty = true;
|
|
// It's possible that a badly behaving OS could try to write more
|
|
// data than we have buffer to handle. Don't let it. We should
|
|
// only need something like 500 bytes, at worst. In the typical
|
|
// case, we're talking about something like
|
|
//
|
|
// ~5 bytes of GAP
|
|
// 3 bytes of sector prolog
|
|
// 2 bytes of volume
|
|
// 2 bytes of track
|
|
// 2 bytes of sector
|
|
// 2 bytes of checksum
|
|
// 2 bytes of epilog
|
|
// ~5 bytes of GAP
|
|
// 3 bytes of data prolog
|
|
// 342 bytes of GRP-encoded (6:2) data
|
|
// 1 byte of checksum
|
|
// 3 bytes of epilog
|
|
// 1 byte of GAP
|
|
// == 373 bytes
|
|
//
|
|
// ... so if we get up to the full 1024 we've allocated, there's
|
|
// something suspicious happening.
|
|
|
|
if (writeLatch < 0x96) {
|
|
// Can't write a de-nibblized byte...
|
|
g_display->debugMsg("DII: bad write");
|
|
return 0;
|
|
}
|
|
|
|
trackBuffer->replaceByte(writeLatch);
|
|
|
|
return 0;
|
|
}
|
|
|
|
// If we're being asked to read a byte from the current track,
|
|
// that's okay - even if it's dirty. As long as we don't change
|
|
// tracks.
|
|
|
|
if (!trackBuffer->hasData()) {
|
|
trackDirty = false;
|
|
trackBuffer->clear();
|
|
|
|
if (diskType[selectedDisk] == nibDisk) {
|
|
// Read one nibblized sector at a time and jam it in trackBuf
|
|
// directly. We don't read the whole track at once only because
|
|
// of RAM constraints on the Teensy. There's no reason we
|
|
// couldn't, though, if RAM weren't at a premium.
|
|
|
|
for (int i=0; i<16; i++) {
|
|
g_filemanager->seekBlock(disk[selectedDisk], curTrack * 16 + i, diskType[selectedDisk] == nibDisk);
|
|
if (!g_filemanager->readBlock(disk[selectedDisk], rawTrackBuffer, diskType[selectedDisk] == nibDisk)) {
|
|
// FIXME: error handling?
|
|
return 0;
|
|
}
|
|
trackBuffer->addBytes(rawTrackBuffer, 416);
|
|
}
|
|
} else {
|
|
// It's a .dsk / .po disk image. Read the whole track in to rawTrackBuffer and nibblize it.
|
|
g_filemanager->seekBlock(disk[selectedDisk], curTrack * 16, diskType[selectedDisk] == nibDisk);
|
|
if (!g_filemanager->readTrack(disk[selectedDisk], rawTrackBuffer, diskType[selectedDisk] == nibDisk)) {
|
|
// FIXME: error handling?
|
|
return 0;
|
|
}
|
|
|
|
nibblizeTrack(trackBuffer, rawTrackBuffer, diskType[selectedDisk], curTrack);
|
|
}
|
|
|
|
trackBuffer->setPeekCursor(0);
|
|
}
|
|
|
|
return trackBuffer->peekNext();
|
|
}
|
|
|
|
const char *DiskII::DiskName(int8_t num)
|
|
{
|
|
if (disk[num] != -1)
|
|
return g_filemanager->fileName(disk[num]);
|
|
|
|
return "";
|
|
}
|
|
|
|
void DiskII::loadROM(uint8_t *toWhere)
|
|
{
|
|
#ifdef TEENSYDUINO
|
|
Serial.println("loading slot rom");
|
|
for (uint16_t i=0; i<=0xFF; i++) {
|
|
toWhere[i] = pgm_read_byte(&romData[i]);
|
|
}
|
|
#else
|
|
printf("loading slot rom\n");
|
|
memcpy(toWhere, romData, 256);
|
|
#endif
|
|
}
|
|
|
|
void DiskII::flushTrack()
|
|
{
|
|
if (!trackDirty) {
|
|
return;
|
|
}
|
|
|
|
// safety check: if we're write-protected, then how did we get here?
|
|
if (writeProt) {
|
|
g_display->debugMsg("Write Protected");
|
|
return;
|
|
}
|
|
|
|
if (!trackBuffer->hasData()) {
|
|
// Dunno what happened - we're writing but haven't initialized the sector buffer?
|
|
return;
|
|
}
|
|
|
|
if (diskType[selectedDisk] == nibDisk) {
|
|
// Write the whole track out exactly as we've got it. Hopefully
|
|
// someone has re-calcuated appropriate checksums on it...
|
|
g_display->debugMsg("Not writing Nib image");
|
|
return;
|
|
}
|
|
|
|
nibErr e = denibblizeTrack(trackBuffer, rawTrackBuffer, diskType[selectedDisk], curTrack);
|
|
switch (e) {
|
|
case errorShortTrack:
|
|
g_display->debugMsg("DII: short track");
|
|
trackBuffer->clear();
|
|
return;
|
|
|
|
case errorMissingSectors:
|
|
g_display->debugMsg("DII: missing sectors");
|
|
trackBuffer->clear();
|
|
break;
|
|
|
|
case errorNone:
|
|
break;
|
|
}
|
|
|
|
// ok, write the track!
|
|
g_filemanager->seekBlock(disk[selectedDisk], curTrack * 16);
|
|
g_filemanager->writeTrack(disk[selectedDisk], rawTrackBuffer);
|
|
|
|
trackDirty = false;
|
|
}
|
|
|