mirror of
https://github.com/whscullin/apple2js.git
synced 2024-01-12 14:14:38 +00:00
910238bf63
* Convert `cards/disk2.js` to Typescript
This is mostly a straightforward conversion of `cards/disk2.js` to
Typescript, with the following exceptions:
* `setState()` did not restore the drive light state correctly
because the callback was called with the old `on` value.
* `setPhase()` did not work for WOZ images.
* `getBinary()` did not work for `nib` files.
* `getBase64()` did not work for `nib` files and maybe didn't work
right at all.
Even with these fixes, local storage still doesn't work correctly.
I have also added several TODOs where methods don't support WOZ disks.
* Convert most uses of `memory` to `Uint8Array`
There are many places in the existing code where we use `Uint8Array`
directly. This change merely makes the `memory` type equivalent to
`Uint8Array`.
This change also changes most ROM data to be read-only in Typescript
to ensure that it is not modified by mistake. This can't be done just
by applying `as const` to the declaration because `Uint8Array`s are
can not be expressed as literals. Instead, we create a new type,
`ReadonlyUint8Array` that drops the mutation methods and makes indexed
access read-only.
See
https://www.growingwiththeweb.com/2020/10/typescript-readonly-typed-arrays.html
for details.
* Tighten types and document `disk2.ts`
While trying to understand the Disk ][ emulation, I tighted the types
and documented the parts that I could, including references to other
sources, like _Understanding the Apple //e_ by Jim Sather.
The one functional change is the addition of the P6 ROM of DOS 3.2 and
earlier. This is automatically selected if the card is initialized for
13 sector disks.
884 lines
30 KiB
TypeScript
884 lines
30 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, 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;
|
|
}
|
|
|
|
/** Common information for Nibble and WOZ disks. */
|
|
interface BaseDrive {
|
|
/** Current disk format. */
|
|
format: DiskFormat,
|
|
/** Current disk volume number. */
|
|
volume: byte,
|
|
/** 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,
|
|
tracks: string[],
|
|
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,
|
|
tracks: [] as string[],
|
|
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(base64_encode(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,
|
|
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(base64_decode(state.tracks[idx]));
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Emulates the 16-sector and 13-sector versions of the Disk ][ drive and controller.
|
|
*/
|
|
export default class DiskII {
|
|
|
|
private drives: Drive[] = [
|
|
{ // Drive 1
|
|
format: 'dsk',
|
|
volume: 254,
|
|
tracks: [],
|
|
track: 0,
|
|
head: 0,
|
|
phase: 0,
|
|
readOnly: false,
|
|
dirty: false
|
|
},
|
|
{ // Drive 2
|
|
format: 'dsk',
|
|
volume: 254,
|
|
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;
|
|
if (this.callbacks.driveLight) {
|
|
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();
|
|
if (this.callbacks.driveLight) {
|
|
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) {
|
|
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) {
|
|
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) {
|
|
this.drives[d - 1] = setDriveState(state.drives[d - 1]);
|
|
this.callbacks.driveLight(d, this.on);
|
|
this.callbacks.dirty(d, this.drives[d - 1].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);
|
|
}
|
|
|
|
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);
|
|
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;
|
|
}
|
|
} |