938 lines
32 KiB
TypeScript
938 lines
32 KiB
TypeScript
import { base64_encode} from '../base64';
|
|
import type {
|
|
byte,
|
|
Card,
|
|
memory,
|
|
nibble,
|
|
rom,
|
|
} from '../types';
|
|
|
|
import {
|
|
FormatWorkerMessage,
|
|
FormatWorkerResponse,
|
|
NibbleFormat,
|
|
DISK_PROCESSED,
|
|
DRIVE_NUMBERS,
|
|
DriveNumber,
|
|
JSONDisk,
|
|
ENCODING_NIBBLE,
|
|
PROCESS_BINARY,
|
|
PROCESS_JSON_DISK,
|
|
PROCESS_JSON,
|
|
ENCODING_BITSTREAM,
|
|
} from '../formats/types';
|
|
|
|
import {
|
|
createDisk,
|
|
createDiskFromJsonDisk
|
|
} from '../formats/create_disk';
|
|
|
|
import { debug, toHex } from '../util';
|
|
import { jsonDecode, jsonEncode, readSector } from '../formats/format_utils';
|
|
|
|
import { BOOTSTRAP_ROM_16, BOOTSTRAP_ROM_13 } from '../roms/cards/disk2';
|
|
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;
|
|
export interface Callbacks {
|
|
driveLight: (drive: DriveNumber, on: boolean) => void;
|
|
dirty: (drive: DriveNumber, dirty: boolean) => void;
|
|
label: (drive: DriveNumber, name?: string, side?: string) => void;
|
|
}
|
|
|
|
/** Common information for Nibble and WOZ disks. */
|
|
|
|
interface BaseDrive {
|
|
/** Current disk format. */
|
|
format: NibbleFormat,
|
|
/** Current disk volume number. */
|
|
volume: byte,
|
|
/** Displayed disk name */
|
|
name: string,
|
|
/** (Optional) Disk side (Front/Back, A/B) */
|
|
side?: 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 {
|
|
/** Woz encoding */
|
|
encoding: typeof ENCODING_BITSTREAM
|
|
/** 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: Uint8Array[];
|
|
}
|
|
|
|
/** Nibble format track data. */
|
|
interface NibbleDrive extends BaseDrive {
|
|
/** Nibble encoding */
|
|
encoding: typeof ENCODING_NIBBLE
|
|
/** Nibble data. The index is the track number. */
|
|
tracks: memory[];
|
|
}
|
|
|
|
type Drive = WozDrive | NibbleDrive;
|
|
|
|
function isNibbleDrive(drive: Drive): drive is NibbleDrive {
|
|
return drive.encoding === ENCODING_NIBBLE;
|
|
}
|
|
|
|
function isWozDrive(drive: Drive): drive is WozDrive {
|
|
return drive.encoding === ENCODING_BITSTREAM;
|
|
}
|
|
|
|
interface DriveState {
|
|
format: NibbleFormat,
|
|
encoding: typeof ENCODING_BITSTREAM | typeof ENCODING_NIBBLE
|
|
volume: byte,
|
|
name: string,
|
|
side?: string,
|
|
tracks: memory[],
|
|
track: byte,
|
|
head: byte,
|
|
phase: Phase,
|
|
readOnly: boolean,
|
|
dirty: boolean,
|
|
trackMap: number[],
|
|
rawTracks: Uint8Array[],
|
|
}
|
|
|
|
interface State {
|
|
drives: DriveState[];
|
|
skip: number;
|
|
latch: number;
|
|
writeMode: boolean;
|
|
on: boolean;
|
|
drive: DriveNumber;
|
|
}
|
|
|
|
function getDriveState(drive: Drive): DriveState {
|
|
const result: DriveState = {
|
|
format: drive.format,
|
|
encoding: drive.encoding,
|
|
volume: drive.volume,
|
|
name: drive.name,
|
|
side: drive.side,
|
|
tracks: [],
|
|
track: drive.track,
|
|
head: drive.head,
|
|
phase: drive.phase,
|
|
readOnly: drive.readOnly,
|
|
dirty: drive.dirty,
|
|
trackMap: [],
|
|
rawTracks: [],
|
|
};
|
|
|
|
if (isNibbleDrive(drive)) {
|
|
for (let idx = 0; idx < drive.tracks.length; idx++) {
|
|
result.tracks.push(new Uint8Array(drive.tracks[idx]));
|
|
}
|
|
}
|
|
if (isWozDrive(drive)) {
|
|
result.trackMap = [...drive.trackMap];
|
|
for (let idx = 0; idx < drive.rawTracks.length; idx++) {
|
|
result.rawTracks.push(new Uint8Array(drive.rawTracks[idx]));
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
function setDriveState(state: DriveState) {
|
|
let result: Drive;
|
|
if (state.encoding === ENCODING_NIBBLE) {
|
|
result = {
|
|
format: state.format,
|
|
encoding: ENCODING_NIBBLE,
|
|
volume: state.volume,
|
|
name: state.name,
|
|
side: state.side,
|
|
tracks: [],
|
|
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]));
|
|
}
|
|
} else {
|
|
result = {
|
|
format: state.format,
|
|
encoding: ENCODING_BITSTREAM,
|
|
volume: state.volume,
|
|
name: state.name,
|
|
side: state.side,
|
|
track: state.track,
|
|
head: state.head,
|
|
phase: state.phase,
|
|
readOnly: state.readOnly,
|
|
dirty: state.dirty,
|
|
trackMap: [...state.trackMap],
|
|
rawTracks: [],
|
|
};
|
|
for (let idx = 0; idx < state.rawTracks.length; idx++) {
|
|
result.rawTracks.push(new Uint8Array(state.rawTracks[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',
|
|
encoding: ENCODING_NIBBLE,
|
|
volume: 254,
|
|
name: 'Disk 1',
|
|
tracks: [],
|
|
track: 0,
|
|
head: 0,
|
|
phase: 0,
|
|
readOnly: false,
|
|
dirty: false,
|
|
},
|
|
{ // Drive 2
|
|
format: 'dsk',
|
|
encoding: ENCODING_NIBBLE,
|
|
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 (1, 2). */
|
|
private drive: DriveNumber = 1;
|
|
/** Current drive object. */
|
|
private cur = this.drives[this.drive - 1];
|
|
|
|
/** Nibbles read this on cycle */
|
|
private nibbleCount = 0;
|
|
|
|
/** 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;
|
|
|
|
private worker: Worker;
|
|
|
|
/** Builds a new Disk ][ card. */
|
|
constructor(private io: Apple2IO, private callbacks: Callbacks, private sectors = 16) {
|
|
this.debug('Disk ][');
|
|
|
|
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.initWorker();
|
|
}
|
|
|
|
private debug(..._args: any[]) {
|
|
// debug.apply(this, arguments);
|
|
}
|
|
|
|
// Only used for WOZ disks
|
|
private moveHead() {
|
|
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;
|
|
|
|
if (!isWozDrive(this.cur)) {
|
|
return;
|
|
}
|
|
const track =
|
|
this.cur.rawTracks[this.cur.trackMap[this.cur.track]] || [0];
|
|
|
|
while (workCycles-- > 0) {
|
|
let pulse: number = 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.on && (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);
|
|
this.debug('nibbles read', this.nibbleCount);
|
|
}, 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.nibbleCount = 0;
|
|
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;
|
|
if (result & 0x80) {
|
|
this.nibbleCount++;
|
|
}
|
|
} 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();
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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]);
|
|
const { name, side, dirty } = state.drives[idx];
|
|
this.callbacks.label(d, name, side);
|
|
this.callbacks.driveLight(d, this.on);
|
|
this.callbacks.dirty(d, dirty);
|
|
}
|
|
this.cur = this.drives[this.drive - 1];
|
|
}
|
|
|
|
getMetadata(driveNo: DriveNumber) {
|
|
const drive = this.drives[driveNo - 1];
|
|
return {
|
|
format: drive.format,
|
|
volume: drive.volume,
|
|
track: drive.track,
|
|
head: drive.head,
|
|
phase: drive.phase,
|
|
readOnly: drive.readOnly,
|
|
dirty: drive.dirty
|
|
};
|
|
}
|
|
|
|
// 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, jsonDisk: JSONDisk) {
|
|
if (this.worker) {
|
|
const message: FormatWorkerMessage = {
|
|
type: PROCESS_JSON_DISK,
|
|
payload: {
|
|
drive,
|
|
jsonDisk
|
|
},
|
|
};
|
|
this.worker.postMessage(message);
|
|
return true;
|
|
} else {
|
|
const disk = createDiskFromJsonDisk(jsonDisk);
|
|
if (disk) {
|
|
const cur = this.drives[drive - 1];
|
|
Object.assign(cur, disk);
|
|
this.updateDirty(drive, false);
|
|
this.callbacks.label(drive, disk.name, disk.side);
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
getJSON(drive: DriveNumber, pretty: boolean = false) {
|
|
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, json: string) {
|
|
if (this.worker) {
|
|
const message: FormatWorkerMessage = {
|
|
type: PROCESS_JSON,
|
|
payload: {
|
|
drive,
|
|
json
|
|
},
|
|
};
|
|
this.worker.postMessage(message);
|
|
} else {
|
|
const cur = this.drives[drive - 1];
|
|
Object.assign(cur, jsonDecode(json));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
setBinary(drive: DriveNumber, name: string, fmt: NibbleFormat, rawData: ArrayBuffer) {
|
|
const readOnly = false;
|
|
const volume = 254;
|
|
const options = {
|
|
name,
|
|
rawData,
|
|
readOnly,
|
|
volume,
|
|
};
|
|
|
|
if (this.worker) {
|
|
const message: FormatWorkerMessage = {
|
|
type: PROCESS_BINARY,
|
|
payload: {
|
|
drive,
|
|
fmt,
|
|
options,
|
|
}
|
|
};
|
|
this.worker.postMessage(message);
|
|
|
|
return true;
|
|
} else {
|
|
const disk = createDisk(fmt, options);
|
|
if (disk) {
|
|
const cur = this.drives[drive - 1];
|
|
const { name, side } = cur;
|
|
Object.assign(cur, disk);
|
|
this.updateDirty(drive, true);
|
|
this.callbacks.label(drive, name, side);
|
|
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
initWorker() {
|
|
this.worker = new Worker('dist/format_worker.bundle.js');
|
|
|
|
this.worker.addEventListener('message', (message: MessageEvent<FormatWorkerResponse>) => {
|
|
const { data } = message;
|
|
switch (data.type) {
|
|
case DISK_PROCESSED:
|
|
{
|
|
const { drive, disk } = data.payload;
|
|
if (disk) {
|
|
const cur = this.drives[drive - 1];
|
|
Object.assign(cur, disk);
|
|
const { name, side } = cur;
|
|
this.updateDirty(drive, true);
|
|
this.callbacks.label(drive, name, side);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
});
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
}
|