apple2js/js/cards/disk2.ts
2021-03-06 15:07:06 -08:00

894 lines
31 KiB
TypeScript

/* Copyright 2010-2019 Will Scullin <scullin@scullinsteel.com>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
import { base64_decode, base64_encode} from '../base64';
import { bit, byte, Card, DiskFormat, MemberOf, memory, nibble, rom } from '../types';
import { debug, toHex } from '../util';
import { Disk, jsonDecode, jsonEncode, readSector } from '../formats/format_utils';
import { BOOTSTRAP_ROM_16, BOOTSTRAP_ROM_13 } from '../roms/cards/disk2';
import _2MG from '../formats/2mg';
import D13 from '../formats/d13';
import DOS from '../formats/do';
import ProDOS from '../formats/po';
import Woz from '../formats/woz';
import Nibble from '../formats/nib';
import Apple2IO from '../apple2io';
/** Softswitch locations */
const LOC = {
// Disk II Controller Commands
// See Understanding the Apple IIe, Table 9.1
PHASE0OFF: 0x80, // Q0L: Phase 0 OFF
PHASE0ON: 0x81, // Q0H: Phase 0 ON
PHASE1OFF: 0x82, // Q1L: Phase 1 OFF
PHASE1ON: 0x83, // Q1H: Phase 1 ON
PHASE2OFF: 0x84, // Q2L: Phase 2 OFF
PHASE2ON: 0x85, // Q2H: Phase 2 ON
PHASE3OFF: 0x86, // Q3L: Phase 3 OFF
PHASE3ON: 0x87, // Q3H: Phase 3 ON
DRIVEOFF: 0x88, // Q4L: Drives OFF
DRIVEON: 0x89, // Q4H: Selected drive ON
DRIVE1: 0x8A, // Q5L: Select drive 1
DRIVE2: 0x8B, // Q5H: Select drive 2
DRIVEREAD: 0x8C, // Q6L: Shift while writing; read data
DRIVEWRITE: 0x8D, // Q6H: Load while writing; read write protect
DRIVEREADMODE: 0x8E, // Q7L: Read
DRIVEWRITEMODE: 0x8F // Q7H: Write
} as const;
/** Logic state sequencer ROM */
// See Understanding the Apple IIe, Table 9.3 Logic State Sequencer Commands
// CODE OPERATION BEFORE AFTER
// 0 CLR XXXXXXXX 00000000
// 8 NOP ABCDEFGH ABCDEFGH
// 9 SL0 ABCDEFGH BCDEFGH0
// A SR (write protected) ABCDEFGH 11111111
// (not write protected) ABCDEFGH 0ABCDEFG
// B LOAD XXXXXXXX YYYYYYYY
// D SL1 ABCDEFGH BCDEFGH1
const SEQUENCER_ROM_13 = [
// See Understanding the Apple IIe, Figure 9.10 The DOS 3.2 Logic State Sequencer
// Note that the column order here is NOT the same as in Figure 9.10 for Q7 H (Write).
//
// Q7 L (Read) Q7 H (Write)
// Q6 L (Shift) Q6 H (Load) Q6 L (Shift) Q6 H (Load)
// QA L QA H QA L QA H QA L QA H QA L QA H
// 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
0xD8, 0x18, 0x18, 0x08, 0x0A, 0x0A, 0x0A, 0x0A, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, // 0
0xD8, 0x2D, 0x28, 0x28, 0x0A, 0x0A, 0x0A, 0x0A, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, // 1
0xD8, 0x38, 0x38, 0x38, 0x0A, 0x0A, 0x0A, 0x0A, 0x39, 0x39, 0x39, 0x39, 0x3B, 0x3B, 0x3B, 0x3B, // 2
0xD8, 0x48, 0xD8, 0x48, 0x0A, 0x0A, 0x0A, 0x0A, 0x48, 0x48, 0x48, 0x48, 0x48, 0x48, 0x48, 0x48, // 3
0xD8, 0x58, 0xD8, 0x58, 0x0A, 0x0A, 0x0A, 0x0A, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, // 4
0xD8, 0x68, 0xD8, 0x68, 0x0A, 0x0A, 0x0A, 0x0A, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, // 5
0xD8, 0x78, 0xD8, 0x78, 0x0A, 0x0A, 0x0A, 0x0A, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, // 6
0xD8, 0x88, 0xD8, 0x88, 0x0A, 0x0A, 0x0A, 0x0A, 0x08, 0x08, 0x88, 0x88, 0x08, 0x08, 0x88, 0x88, // 7
0xD8, 0x98, 0xD8, 0x98, 0x0A, 0x0A, 0x0A, 0x0A, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, // 8
0xD8, 0x09, 0xD8, 0xA8, 0x0A, 0x0A, 0x0A, 0x0A, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, // 9
0xCD, 0xBD, 0xD8, 0xB8, 0x0A, 0x0A, 0x0A, 0x0A, 0xB9, 0xB9, 0xB9, 0xB9, 0xBB, 0xBB, 0xBB, 0xBB, // A
0xD9, 0x39, 0xD8, 0xC8, 0x0A, 0x0A, 0x0A, 0x0A, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, // B
0xD9, 0xD9, 0xD8, 0xA0, 0x0A, 0x0A, 0x0A, 0x0A, 0xD8, 0xD8, 0xD8, 0xD8, 0xD8, 0xD8, 0xD8, 0xD8, // C
0x1D, 0x0D, 0xE8, 0xE8, 0x0A, 0x0A, 0x0A, 0x0A, 0xE8, 0xE8, 0xE8, 0xE8, 0xE8, 0xE8, 0xE8, 0xE8, // D
0xFD, 0xFD, 0xF8, 0xF8, 0x0A, 0x0A, 0x0A, 0x0A, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8, // E
0xDD, 0x4D, 0xE0, 0xE0, 0x0A, 0x0A, 0x0A, 0x0A, 0x88, 0x88, 0x08, 0x08, 0x88, 0x88, 0x08, 0x08 // F
] as const;
const SEQUENCER_ROM_16 = [
// See Understanding the Apple IIe, Figure 9.11 The DOS 3.3 Logic State Sequencer
// Note that the column order here is NOT the same as in Figure 9.11 for Q7 H (Write).
//
// Q7 L (Read) Q7 H (Write)
// Q6 L (Shift) Q6 H (Load) Q6 L (Shift) Q6 H (Load)
// QA L QA H QA L QA H QA L QA H QA L QA H
// 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
0x18, 0x18, 0x18, 0x18, 0x0A, 0x0A, 0x0A, 0x0A, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, // 0
0x2D, 0x2D, 0x38, 0x38, 0x0A, 0x0A, 0x0A, 0x0A, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, // 1
0xD8, 0x38, 0x08, 0x28, 0x0A, 0x0A, 0x0A, 0x0A, 0x39, 0x39, 0x39, 0x39, 0x3B, 0x3B, 0x3B, 0x3B, // 2
0xD8, 0x48, 0x48, 0x48, 0x0A, 0x0A, 0x0A, 0x0A, 0x48, 0x48, 0x48, 0x48, 0x48, 0x48, 0x48, 0x48, // 3
0xD8, 0x58, 0xD8, 0x58, 0x0A, 0x0A, 0x0A, 0x0A, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, // 4
0xD8, 0x68, 0xD8, 0x68, 0x0A, 0x0A, 0x0A, 0x0A, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, // 5
0xD8, 0x78, 0xD8, 0x78, 0x0A, 0x0A, 0x0A, 0x0A, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, // 6
0xD8, 0x88, 0xD8, 0x88, 0x0A, 0x0A, 0x0A, 0x0A, 0x08, 0x08, 0x88, 0x88, 0x08, 0x08, 0x88, 0x88, // 7
0xD8, 0x98, 0xD8, 0x98, 0x0A, 0x0A, 0x0A, 0x0A, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, // 8
0xD8, 0x29, 0xD8, 0xA8, 0x0A, 0x0A, 0x0A, 0x0A, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, // 9
0xCD, 0xBD, 0xD8, 0xB8, 0x0A, 0x0A, 0x0A, 0x0A, 0xB9, 0xB9, 0xB9, 0xB9, 0xBB, 0xBB, 0xBB, 0xBB, // A
0xD9, 0x59, 0xD8, 0xC8, 0x0A, 0x0A, 0x0A, 0x0A, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, // B
0xD9, 0xD9, 0xD8, 0xA0, 0x0A, 0x0A, 0x0A, 0x0A, 0xD8, 0xD8, 0xD8, 0xD8, 0xD8, 0xD8, 0xD8, 0xD8, // C
0xD8, 0x08, 0xE8, 0xE8, 0x0A, 0x0A, 0x0A, 0x0A, 0xE8, 0xE8, 0xE8, 0xE8, 0xE8, 0xE8, 0xE8, 0xE8, // D
0xFD, 0xFD, 0xF8, 0xF8, 0x0A, 0x0A, 0x0A, 0x0A, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8, // E
0xDD, 0x4D, 0xE0, 0xE0, 0x0A, 0x0A, 0x0A, 0x0A, 0x88, 0x88, 0x08, 0x08, 0x88, 0x88, 0x08, 0x08 // F
] as const;
type LssClockCycle = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7;
type Phase = 0 | 1 | 2 | 3;
/**
* How far the head moves, in quarter tracks, when in phase X and phase Y is
* activated. For example, if in phase 0 (top row), turning on phase 3 would
* step backwards a quarter track while turning on phase 2 would step forwards
* a half track.
*
* Note that this emulation is highly simplified as it only takes into account
* the order that coils are powered on and ignores when they are powered off.
* The actual hardware allows for multiple coils to be powered at the same time
* providing different levels of torque on the head arm. Along with that, the
* RWTS uses a complex delay system to drive the coils faster based on expected
* head momentum.
*
* Examining the https://computerhistory.org/blog/apple-ii-dos-source-code/,
* one finds that the SEEK routine on line 4831 of `appdos31.lst`. It uses
* `ONTABLE` and `OFFTABLE` (each 12 bytes) to know exactly how many
* microseconds to power on/off each coil as the head accelerates. At the end,
* the final coil is left powered on 9.5 milliseconds to ensure the head has
* settled.
*
* https://embeddedmicro.weebly.com/apple-2iie.html shows traces of the boot
* seek (which is slightly different) and a regular seek.
*/
const PHASE_DELTA = [
[0, 1, 2, -1],
[-1, 0, 1, 2],
[-2, -1, 0, 1],
[1, -2, -1, 0]
] as const;
const DRIVE_NUMBERS = [1, 2] as const;
type DriveNumber = MemberOf<typeof DRIVE_NUMBERS>;
interface Callbacks {
driveLight: (drive: DriveNumber, on: boolean) => void;
dirty: (drive: DriveNumber, dirty: boolean) => void;
label: (drive: DriveNumber, name: string) => void;
}
/** Common information for Nibble and WOZ disks. */
interface BaseDrive {
/** Current disk format. */
format: DiskFormat,
/** Current disk volume number. */
volume: byte,
/** Displayed disk name */
name: string,
/** Quarter track position of read/write head. */
track: byte,
/** Position of the head on the track. */
head: byte,
/** Current active coil in the head stepper motor. */
phase: Phase,
/** Whether the drive write protect is on. */
readOnly: boolean,
/** Whether the drive has been written to since it was loaded. */
dirty: boolean,
}
/** WOZ format track data from https://applesaucefdc.com/woz/reference2/. */
interface WozDrive extends BaseDrive {
/** Maps quarter tracks to data in rawTracks; `0xFF` = random garbage. */
trackMap: byte[];
/** Unique track bitstreams. The index is arbitrary; it is NOT the track number. */
rawTracks: bit[][];
}
/** Nibble format track data. */
interface NibbleDrive extends BaseDrive {
/** Nibble data. The index is the track number. */
tracks: memory[];
}
type Drive = WozDrive | NibbleDrive;
function isNibbleDrive(drive: Drive): drive is NibbleDrive {
return 'tracks' in drive;
}
// Does not support WOZ disks
interface DriveState {
format: DiskFormat,
volume: byte,
name: string,
tracks: memory[],
track: byte,
head: byte,
phase: Phase,
readOnly: boolean,
dirty: boolean,
}
interface State {
drives: DriveState[];
skip: number;
latch: number;
writeMode: boolean;
on: boolean;
drive: DriveNumber;
}
// TODO(flan): Does not work for WOZ disks
function getDriveState(drive: Drive): DriveState {
const result: DriveState = {
format: drive.format,
volume: drive.volume,
name: drive.name,
tracks: [],
track: drive.track,
head: drive.head,
phase: drive.phase,
readOnly: drive.readOnly,
dirty: drive.dirty
};
if (!isNibbleDrive(drive)) {
throw Error('No tracks.');
}
for (let idx = 0; idx < drive.tracks.length; idx++) {
result.tracks.push(new Uint8Array(drive.tracks[idx]));
}
return result;
}
// TODO(flan): Does not work for WOZ disks
function setDriveState(state: DriveState) {
const result: Drive = {
format: state.format,
volume: state.volume,
name: state.name,
tracks: [] as memory[],
track: state.track,
head: state.head,
phase: state.phase,
readOnly: state.readOnly,
dirty: state.dirty
};
for (let idx = 0; idx < state.tracks.length; idx++) {
result.tracks!.push(new Uint8Array(state.tracks[idx]));
}
return result;
}
/**
* Emulates the 16-sector and 13-sector versions of the Disk ][ drive and controller.
*/
export default class DiskII implements Card {
private drives: Drive[] = [
{ // Drive 1
format: 'dsk',
volume: 254,
name: 'Disk 1',
tracks: [],
track: 0,
head: 0,
phase: 0,
readOnly: false,
dirty: false
},
{ // Drive 2
format: 'dsk',
volume: 254,
name: 'Disk 2',
tracks: [],
track: 0,
head: 0,
phase: 0,
readOnly: false,
dirty: false
}];
private skip = 0;
/** Last data written by the CPU to card softswitch 0x8D. */
private bus = 0;
/** Drive data register. */
private latch = 0;
/** Drive off timeout id or null. */
private offTimeout: number | null = null;
/** Q6 (Shift/Load): Used by WOZ disks. */
private q6 = 0;
/** Q7 (Read/Write): Used by WOZ disks. */
private q7: boolean = false;
/** Q7 (Read/Write): Used by Nibble disks. */
private writeMode = false;
/** Whether the selected drive is on. */
private on = false;
/** Current drive number (0, 1). */
private drive: DriveNumber = 1;
/** Current drive object. */
private cur = this.drives[this.drive - 1];
/** Q0-Q3: Coil states. */
private q = [false, false, false, false];
/** The 8-cycle LSS clock. */
private clock: LssClockCycle = 0;
/** Current CPU cycle count. */
private lastCycles = 0;
/** Current state of the Logic State Sequencer. */
private state: nibble = 0;
/**
* Number of zeros read in a row. The Disk ][ can only read two zeros in a
* row reliably; above that and the drive starts reporting garbage. See
* "Freaking Out Like a MC3470" in the WOZ spec.
*/
private zeros = 0;
/** Contents of the P5 ROM at 0xCnXX. */
private bootstrapRom: rom;
/** Contents of the P6 ROM. */
private sequencerRom: typeof SEQUENCER_ROM_16 | typeof SEQUENCER_ROM_13;
/** Builds a new Disk ][ card. */
constructor(private io: Apple2IO, private callbacks: Callbacks, private sectors = 16) {
this.lastCycles = this.io.cycles();
this.bootstrapRom = this.sectors == 16 ? BOOTSTRAP_ROM_16 : BOOTSTRAP_ROM_13;
this.sequencerRom = this.sectors == 16 ? SEQUENCER_ROM_16 : SEQUENCER_ROM_13;
this.init();
}
private debug(..._args: any) {
// debug.apply(this, arguments);
}
private init() {
this.debug('Disk ][');
}
// Only used for WOZ disks
private moveHead() {
if (isNibbleDrive(this.cur)) {
return;
}
const track: bit[] =
this.cur.rawTracks[this.cur.trackMap[this.cur.track]] || [0];
const cycles = this.io.cycles();
// Spin the disk the number of elapsed cycles since last call
let workCycles = (cycles - this.lastCycles) * 2;
this.lastCycles = cycles;
while (workCycles-- > 0) {
let pulse: bit = 0;
if (this.clock == 4) {
pulse = track[this.cur.head];
if (!pulse) {
// More that 2 zeros can not be read reliably.
if (++this.zeros > 2) {
pulse = Math.random() >= 0.5 ? 1 : 0;
}
} else {
this.zeros = 0;
}
}
let idx = 0;
idx |= pulse ? 0x00 : 0x01;
idx |= this.latch & 0x80 ? 0x02 : 0x00;
idx |= this.q6 ? 0x04 : 0x00;
idx |= this.q7 ? 0x08 : 0x00;
idx |= this.state << 4;
const command = this.sequencerRom[idx];
if (this.on && this.q7) {
debug('clock:', this.clock, 'command:', toHex(command), 'q6:', this.q6);
}
switch (command & 0xf) {
case 0x0: // CLR
this.latch = 0;
break;
case 0x8: // NOP
break;
case 0x9: // SL0
this.latch = (this.latch << 1) & 0xff;
break;
case 0xA: // SR
this.latch >>= 1;
if (this.cur.readOnly) {
this.latch |= 0x80;
}
break;
case 0xB: // LD
this.latch = this.bus;
debug('Loading', toHex(this.latch), 'from bus');
break;
case 0xD: // SL1
this.latch = ((this.latch << 1) | 0x01) & 0xff;
break;
}
this.state = (command >> 4 & 0xF) as nibble;
if (this.clock == 4) {
if (this.on) {
if (this.q7) {
track[this.cur.head] = this.state & 0x8 ? 0x01 : 0x00;
debug('Wrote', this.state & 0x8 ? 0x01 : 0x00);
}
if (++this.cur.head >= track.length) {
this.cur.head = 0;
}
}
}
if (++this.clock > 7) {
this.clock = 0;
}
}
}
// Only called for non-WOZ disks
private readWriteNext() {
if (!isNibbleDrive(this.cur)) {
return;
}
if (this.skip || this.writeMode) {
const track = this.cur.tracks![this.cur.track >> 2];
if (track && track.length) {
if (this.cur.head >= track.length) {
this.cur.head = 0;
}
if (this.writeMode) {
if (!this.cur.readOnly) {
track[this.cur.head] = this.bus;
if (!this.cur.dirty) {
this.updateDirty(this.drive, true);
}
}
} else {
this.latch = track[this.cur.head];
}
++this.cur.head;
}
} else {
this.latch = 0;
}
this.skip = (++this.skip % 2);
}
/**
* Sets whether the head positioning stepper motor coil for the given
* phase is on or off. Normally, the motor must be stepped two phases
* per track. Half tracks can be written by stepping only once; quarter
* tracks by activating two neighboring coils at once.
*/
private setPhase(phase: Phase, on: boolean) {
this.debug('phase ' + phase + (on ? ' on' : ' off'));
if (on) {
this.cur.track += PHASE_DELTA[this.cur.phase][phase] * 2;
this.cur.phase = phase;
}
const maxTrack = isNibbleDrive(this.cur)
? this.cur.tracks.length * 4 - 1
: this.cur.trackMap.length - 1;
if (this.cur.track > maxTrack) {
this.cur.track = maxTrack;
}
if (this.cur.track < 0x0) {
this.cur.track = 0x0;
}
// debug(
// 'Drive', _drive, 'track', toHex(_cur.track >> 2) + '.' + (_cur.track & 0x3),
// '(' + toHex(_cur.track) + ')',
// '[' + phase + ':' + (on ? 'on' : 'off') + ']');
this.q[phase] = on;
}
private access(off: byte, val?: byte) {
let result = 0;
const readMode = val === undefined;
switch (off & 0x8f) {
case LOC.PHASE0OFF: // 0x00
this.setPhase(0, false);
break;
case LOC.PHASE0ON: // 0x01
this.setPhase(0, true);
break;
case LOC.PHASE1OFF: // 0x02
this.setPhase(1, false);
break;
case LOC.PHASE1ON: // 0x03
this.setPhase(1, true);
break;
case LOC.PHASE2OFF: // 0x04
this.setPhase(2, false);
break;
case LOC.PHASE2ON: // 0x05
this.setPhase(2, true);
break;
case LOC.PHASE3OFF: // 0x06
this.setPhase(3, false);
break;
case LOC.PHASE3ON: // 0x07
this.setPhase(3, true);
break;
case LOC.DRIVEOFF: // 0x08
if (!this.offTimeout) {
if (this.on) {
// TODO(flan): This is fragile because it relies on
// wall-clock time instead of emulator time.
this.offTimeout = window.setTimeout(() => {
this.debug('Drive Off');
this.on = false;
this.callbacks.driveLight(this.drive, false);
}, 1000);
}
}
break;
case LOC.DRIVEON: // 0x09
if (this.offTimeout) {
// TODO(flan): Fragile—see above
window.clearTimeout(this.offTimeout);
this.offTimeout = null;
}
if (!this.on) {
this.debug('Drive On');
this.on = true;
this.lastCycles = this.io.cycles();
this.callbacks.driveLight(this.drive, true);
}
break;
case LOC.DRIVE1: // 0x0a
this.debug('Disk 1');
this.drive = 1;
this.cur = this.drives[this.drive - 1];
if (this.on) {
this.callbacks.driveLight(2, false);
this.callbacks.driveLight(1, true);
}
break;
case LOC.DRIVE2: // 0x0b
this.debug('Disk 2');
this.drive = 2;
this.cur = this.drives[this.drive - 1];
if (this.on) {
this.callbacks.driveLight(1, false);
this.callbacks.driveLight(2, true);
}
break;
case LOC.DRIVEREAD: // 0x0c (Q6L) Shift
this.q6 = 0;
if (this.writeMode) {
this.debug('clearing _q6/SHIFT');
}
if (isNibbleDrive(this.cur)) {
this.readWriteNext();
}
break;
case LOC.DRIVEWRITE: // 0x0d (Q6H) LOAD
this.q6 = 1;
if (this.writeMode) {
this.debug('setting _q6/LOAD');
}
if (isNibbleDrive(this.cur)) {
if (readMode && !this.writeMode) {
if (this.cur.readOnly) {
this.latch = 0xff;
this.debug('Setting readOnly');
} else {
this.latch = this.latch >> 1;
this.debug('Clearing readOnly');
}
}
}
break;
case LOC.DRIVEREADMODE: // 0x0e (Q7L)
this.debug('Read Mode');
this.q7 = false;
this.writeMode = false;
break;
case LOC.DRIVEWRITEMODE: // 0x0f (Q7H)
this.debug('Write Mode');
this.q7 = false;
this.writeMode = true;
break;
default:
break;
}
this.moveHead();
if (readMode) {
// According to UtAIIe, p. 9-13 to 9-14, any even address can be
// used to read the data register onto the CPU bus, although some
// also cause conflicts with the disk controller commands.
if ((off & 0x01) === 0) {
result = this.latch;
} else {
result = 0;
}
} else {
// It's not explicitly stated, but writes to any address set the
// data register.
this.bus = val!;
}
return result;
}
private updateDirty(drive: DriveNumber, dirty: boolean) {
this.drives[drive - 1].dirty = dirty;
if (this.callbacks.dirty) {
this.callbacks.dirty(drive, dirty);
}
}
ioSwitch(off: byte, val?: byte) {
return this.access(off, val);
}
read(_page: byte, off: byte) {
return this.bootstrapRom[off];
}
write() { }
reset() {
if (this.on) {
this.callbacks.driveLight(this.drive, false);
this.writeMode = false;
this.on = false;
this.drive = 1;
this.cur = this.drives[this.drive - 1];
}
for (let idx = 0; idx < 4; idx++) {
this.q[idx] = false;
}
}
tick() {
this.moveHead();
}
// TODO(flan): Does not work for WOZ disks
getState() {
const result = {
drives: [] as DriveState[],
skip: this.skip,
latch: this.latch,
writeMode: this.writeMode,
on: this.on,
drive: this.drive
};
this.drives.forEach(function (drive, idx) {
result.drives[idx] = getDriveState(drive);
});
return result;
}
// TODO(flan): Does not work for WOZ disks
setState(state: State) {
this.skip = state.skip;
this.latch = state.latch;
this.writeMode = state.writeMode;
this.on = state.on;
this.drive = state.drive;
for (const d of DRIVE_NUMBERS) {
const idx = d - 1;
this.drives[idx] = setDriveState(state.drives[idx]);
this.callbacks.label(d, state.drives[idx].name);
this.callbacks.driveLight(d, this.on);
this.callbacks.dirty(d, this.drives[idx].dirty);
}
this.cur = this.drives[this.drive - 1];
}
// TODO(flan): Does not work for WOZ disks
getMetadata(driveNo: DriveNumber) {
const drive = this.drives[driveNo - 1];
if (isNibbleDrive(drive)) {
return {
format: drive.format,
volume: drive.volume,
track: drive.track,
head: drive.head,
phase: drive.phase,
readOnly: drive.readOnly,
dirty: drive.dirty
};
} else {
return null;
}
}
// TODO(flan): Does not work on WOZ disks
rwts(disk: DriveNumber, track: byte, sector: byte) {
const cur = this.drives[disk - 1];
if (!isNibbleDrive(cur)) {
throw new Error('Can\'t read WOZ disks');
}
return readSector(cur, track, sector);
}
/** Sets the data for `drive` from `disk`, which is expected to be JSON. */
// TODO(flan): This implementation is not very safe.
setDisk(drive: DriveNumber, disk: any) {
const fmt = disk.type as DiskFormat;
const readOnly = disk.readOnly;
const name = disk.name;
let data: memory[] | memory[][];
if (disk.encoding == 'base64') {
data = [];
for (let t = 0; t < disk.data.length; t++) {
if (fmt == 'nib') {
data[t] = base64_decode(disk.data[t] as string);
} else {
data[t] = [];
for (let s = 0; s < disk.data[t].length; s++) {
data[t][s] = base64_decode(disk.data[t][s] as string);
}
}
}
} else {
data = disk.data;
}
const cur = this.drives[drive - 1];
// var v = (fmt === 'dsk' ? data[0x11][0x00][0x06] : 0xfe);
// if (v == 0x00) {
const volume = disk.volume || 0xfe;
// }
const options = {
volume,
readOnly,
name,
data
};
let newDisk: Disk;
switch (fmt) {
case 'd13':
newDisk = D13(options);
break;
case 'do':
case 'dsk':
newDisk = DOS(options);
break;
case 'nib':
newDisk = Nibble(options);
break;
case 'po':
newDisk = ProDOS(options);
break;
default:
return false;
}
Object.assign(cur, newDisk);
this.updateDirty(this.drive, false);
this.callbacks.label(this.drive, name);
}
getJSON(drive: DriveNumber, pretty: boolean) {
const cur = this.drives[drive - 1];
if (!isNibbleDrive(cur)) {
throw new Error('Can\'t save WOZ disks to JSON');
}
return jsonEncode(cur, pretty);
}
setJSON(drive: DriveNumber, data: any) {
const cur = this.drives[drive - 1];
Object.assign(cur, jsonDecode(data));
return true;
}
setBinary(drive: DriveNumber, name: string, fmt: DiskFormat, rawData: memory) {
let disk;
const cur = this.drives[drive - 1];
const readOnly = false;
const volume = 254;
const options = {
name,
rawData,
readOnly,
volume
};
switch (fmt) {
case '2mg':
disk = _2MG(options);
break;
case 'd13':
disk = D13(options);
break;
case 'do':
case 'dsk':
disk = DOS(options);
break;
case 'nib':
disk = Nibble(options);
break;
case 'po':
disk = ProDOS(options);
break;
case 'woz':
disk = Woz(options);
break;
default:
return false;
}
Object.assign(cur, disk);
this.updateDirty(drive, true);
this.callbacks.label(this.drive, name);
return true;
}
// TODO(flan): Does not work with WOZ disks
getBinary(drive: DriveNumber) {
const cur = this.drives[drive - 1];
if (!isNibbleDrive(cur)) {
return null;
}
// TODO(flan): Assumes 16-sectors
const len = (16 * cur.tracks.length * 256);
const data = new Uint8Array(len);
let idx = 0;
for (let t = 0; t < cur.tracks.length; t++) {
if (cur.format === 'nib') {
data.set(cur.tracks[t], idx);
idx += cur.tracks[t].length;
} else {
for (let s = 0; s < 0x10; s++) {
const sector = readSector(cur, t, s);
data.set(sector, idx);
idx += sector.length;
}
}
}
return data;
}
// TODO(flan): Does not work with WOZ disks
getBase64(drive: DriveNumber) {
const cur = this.drives[drive - 1];
if (!isNibbleDrive(cur)) {
return null;
}
const data: string[][] | string[] = [];
for (let t = 0; t < cur.tracks.length; t++) {
if (cur.format === 'nib') {
data[t] = base64_encode(cur.tracks[t]);
} else {
const track: string[] = [];
for (let s = 0; s < 0x10; s++) {
track[s] = base64_encode(readSector(cur, t, s));
}
data[t] = track;
}
}
return data;
}
}