Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import {
Command as IntelCommand,
DriveOut,
Result,
State as IntelState,
StatusFlag,
TimerState as IntelTimerState,
} from "../intel-fdc.js";
import {
Command as WdCommand,
CommandBits as WdCommandBits,
Control,
State as WdState,
Status,
TimerState as WdTimerState,
} from "../wd-fdc.js";
import { decodedPanel, DecodedRegisters, fixed, lit, register, spelt } from "./decoded-registers.js";
import { Centred, StartEdge } from "./panel-layout.js";
import { readStored, writeStored } from "./stored-json.js";
const MinPanelSize = { w: 240, h: 160 };
const MaxLogLines = 10000;
const LogStorageKey = "fdcLog";
const ResultCodeMask = 0x1e;
const SectorCountMask = 0x1f;
const SectorSizeShift = 5;
const SmallestSectorBytes = 128;
const IntelParamCount = 5;
const WdCommandMask = 0xf0;
const Acronyms = new Set(["id", "crc", "dma", "fm", "mfm"]);
/** An enum's name for a value, as words: `syncingForIdWait` as "syncing for ID wait". */
function spellName(values, value) {
const name = Object.keys(values).find((key) => values[key] === value) ?? `&${hexbyte(value)}`;
return name
.replaceAll("_", " ")
.replace(/([a-z0-9])([A-Z])/g, "$1 $2")
.toLowerCase()
.split(" ")
.map((word) => (Acronyms.has(word) ? word.toUpperCase() : word))
.join(" ");
}
const spellingsOf = (values) => Object.values(values).map((value) => spellName(values, value));
/** Lights for a register's named bits, in the order given. */
const bitLights = (value, bits) => bits.map(([mask, text, title]) => lit(text, title, value & mask));
// ---- The 8271 ----
const track = { title: "the track", describe: (value) => `track ${value}` };
const sector = { title: "the first sector", describe: (value) => `sector ${value}` };
const sizeAndCount = {
title: "bits 5-7 the sector size, 128 bytes doubled that many times; bits 0-4 how many sectors",
describe: (value) => `${value & SectorCountMask} × ${SmallestSectorBytes << (value >>> SectorSizeShift)} bytes`,
};
const gap = (n) => ({ title: `the length of gap ${n}`, describe: (value) => `gap ${n}: ${value}` });
const specialRegister = { title: "the special register", describe: (value) => `register &${hexbyte(value)}` };
const IntelParams = new Map([
...[
IntelCommand.scanData,
IntelCommand.scanDataAndDeleted,
IntelCommand.writeData,
IntelCommand.writeDeletedData,
IntelCommand.readData,
IntelCommand.readDataAndDeleted,
IntelCommand.verify,
].map((command) => [command, [track, sector, sizeAndCount]]),
[IntelCommand.readId, [track, null, { title: "how many IDs to read", describe: (value) => `${value} IDs` }]],
[IntelCommand.format, [track, gap(3), sizeAndCount, gap(5), gap(1)]],
[IntelCommand.seek, [track]],
[IntelCommand.specify, [{ ...specialRegister, title: "the first register the next three parameters set" }]],
[
IntelCommand.writeSpecialRegister,
[specialRegister, { title: "the value written", describe: (value) => `value &${hexbyte(value)}` }],
],
[IntelCommand.readSpecialRegister, [specialRegister]],
]);
const IntelCommandNames = spellingsOf(IntelCommand);
const ResultCodes = Object.fromEntries(Object.entries(Result).filter(([, code]) => code & ResultCodeMask || !code));
const ResultNames = spellingsOf(ResultCodes);
function intelPhase({ state, timerState, awaitingParams }) {
if (awaitingParams) return "waiting for parameters";
if (timerState === IntelTimerState.seekStep) return "stepping";
Iif (timerState === IntelTimerState.postSeek) return "settling";
return spellName(IntelState, state);
}
const IntelPhases = ["waiting for parameters", ...spellingsOf(IntelState)];
const paramRow = (index) =>
register(
`P${index + 1}`,
`Parameter ${index + 1}, as the 8271 holds it: some count down as the command runs`,
8,
(s) => s.params[index],
(value, { command }) => {
const param = IntelParams.get(command)?.[index];
return param ? [fixed(param.describe(value), param.title)] : [];
},
);
const IntelSections = {
command: [
{
heading: "Command",
registers: [
register(
"CMD",
"The command, without its drive select and parameter count bits",
8,
(s) => s.command,
(value) => [spelt(spellName(IntelCommand, value), "The command", IntelCommandNames)],
),
...Array.from({ length: IntelParamCount }, (_, index) => paramRow(index)),
],
},
{
heading: "Status",
registers: [
register(
"STA",
"The status register",
8,
(s) => s.status,
(value) =>
bitLights(value, [
[StatusFlag.busy, "busy", "Busy with a command"],
[StatusFlag.commandFull, "cmd full", "The command register is full"],
[StatusFlag.paramFull, "param full", "The parameter register is full"],
[StatusFlag.resultReady, "result", "A result is ready to read"],
[StatusFlag.nmi, "NMI", "Asking for an NMI"],
[StatusFlag.needData, "data", "Waiting for a data byte to be read or written"],
]),
),
register(
"RES",
"The result of the last command",
8,
(s) => s.result,
(value) => [
spelt(spellName(ResultCodes, value & ResultCodeMask), "Bits 1-4: how it ended", ResultNames),
lit(
"deleted data",
"Bit 5: a sector read had the deleted data mark",
value & Result.flagDeletedData,
),
],
),
register(
"PHASE",
"Where the 8271 is in the command",
8,
(s) => s.state,
(_, s) => [spelt(intelPhase(s), "What the 8271 is doing", IntelPhases)],
),
],
},
],
drive: [
{
heading: "Drive lines",
registers: [
register(
"OUT",
"The drive output lines",
8,
(s) => s.driveOut,
(value) =>
bitLights(value, [
[DriveOut.select_1, "sel 1", "Drive 1 selected"],
[DriveOut.select_0, "sel 0", "Drive 0 selected"],
[DriveOut.side, "side 1", "The upper side"],
[DriveOut.lowHeadCurrent, "low I", "Low head current, for the inner tracks"],
[DriveOut.loadHead, "load", "Load head: the head on the disc and the motor on"],
[DriveOut.direction, "in", "Step direction: towards the centre"],
[DriveOut.step, "step", "Step pulse"],
[DriveOut.writeEnable, "write", "Write enable"],
]),
),
...[0, 1].map((drive) =>
register(
`TRK${drive}`,
`Where the 8271 believes drive ${drive}'s head is`,
8,
(s) => s.trackRegisters[drive],
(value) => [fixed(`track ${value}`, `The 8271's track register for drive ${drive}`)],
),
),
],
},
],
};
/** The drives a select pattern names, as words to follow a command's name. */
function drivesNamed(selected) {
const drives = selected.flatMap((on, drive) => (on ? [drive] : []));
Iif (!drives.length) return "";
return drives.length === 1 ? `, drive ${drives[0]}` : `, drives ${drives.join(" and ")}`;
}
const headOn = (headTrack) => (headTrack === null ? "" : ` (head on track ${headTrack})`);
const hexBytes = (values) => values.map(hexbyte).join(" ");
const IntelValueResults = new Set([IntelCommand.readDriveStatus, IntelCommand.readSpecialRegister]);
function intelLogLine(entry) {
switch (entry.kind) {
case "command": {
const { byte, command, select, params, headTrack } = entry;
const meanings = (IntelParams.get(command) ?? [])
.slice(0, params.length)
.flatMap((param, index) => (param ? [param.describe(params[index])] : []));
const where = drivesNamed([select & DriveOut.select_0, select & DriveOut.select_1]);
return {
text: `${spellName(IntelCommand, command)}${where}${meanings.length ? `: ${meanings.join(", ")}` : ""}${headOn(headTrack)}`,
raw: `cmd ${hexbyte(byte)}${params.length ? ` params ${hexBytes(params)}` : ""}`,
};
}
case "result": {
const { command, status, result } = entry;
const deleted = result & Result.flagDeletedData ? ", deleted data" : "";
return {
text: IntelValueResults.has(command)
? `result &${hexbyte(result)}`
: `done: ${spellName(ResultCodes, result & ResultCodeMask)}${deleted}`,
raw: `status ${hexbyte(status)} result ${hexbyte(result)}`,
};
}
case "state":
return { text: `state: ${spellName(IntelState, entry.from)} → ${spellName(IntelState, entry.to)}` };
default:
return { text: entry.text };
}
}
// ---- The 1770 ----
const WdCommandNames = spellingsOf(WdCommand);
/** The type of the command itself: a force interrupt with the controller idle leaves its last command in place. */
function wdCommandType(command) {
if (command < WdCommand.readSector) return 1;
Eif (command < WdCommand.readAddress) return 2;
return 3;
}
function wdCommandMeaning(value, { commandType: typeInForce, isVerify, isMulti, isSettle, isDeleted, stepRateMs }) {
if (!typeInForce) return [];
const commandType = wdCommandType(value);
const meanings = [spelt(spellName(WdCommand, value), `A type ${commandType} command`, WdCommandNames)];
if (commandType === 1)
meanings.push(
lit("verify", "Read an ID at the end of the seek to check the track", isVerify),
fixed(`${stepRateMs} ms`, "The step rate"),
);
if (commandType === 2) meanings.push(lit("multi", "Go on to the next sector", isMulti));
if (commandType !== 1) meanings.push(lit("settle", "Wait for the head to settle first", isSettle));
if (value === WdCommand.writeSector || value === WdCommand.writeSectorMulti)
meanings.push(lit("deleted", "Write a deleted data mark", isDeleted));
return meanings;
}
const WdTypeIStatus = [
[Status.motorOn, "motor", "The motor is on"],
[Status.writeProtected, "WP", "The disc is write protected"],
[Status.typeISpinUpDone, "spun up", "The motor has spun up"],
[Status.recordNotFound, "seek err", "Seek error: the verify found no ID with the track number"],
[Status.crcError, "CRC", "A CRC error in an ID"],
[Status.typeITrack0, "track 0", "The head is over track 0"],
[Status.typeIIndex, "index", "The index pulse"],
[Status.busy, "busy", "Busy with a command"],
];
const WdTypeIIStatus = [
[Status.motorOn, "motor", "The motor is on"],
[Status.writeProtected, "WP", "A write was refused: the disc is write protected"],
[Status.typeIIorIIIDeletedMark, "deleted", "The sector read had a deleted data mark"],
[Status.recordNotFound, "not found", "The sector was not found"],
[Status.crcError, "CRC", "A CRC error"],
[Status.typeIIorIIILostByte, "lost", "A byte was lost: the host was too slow"],
[Status.typeIIorIIIDrq, "DRQ", "A data byte waits to be read or written"],
[Status.busy, "busy", "Busy with a command"],
];
function wdPhase({ state, timerState }) {
Iif (state === WdState.timerWait) return spellName(WdTimerState, timerState);
return spellName(WdState, state);
}
const WdPhases = [...spellingsOf(WdState), ...spellingsOf(WdTimerState)];
const plainRow = (name, title, field, text) =>
register(
name,
title,
8,
(s) => s[field],
(value) => [fixed(text(value), title)],
);
const WdSections = {
command: [
{
heading: "Command",
registers: [
register("CMD", "The command, without its flag bits", 8, (s) => s.command, wdCommandMeaning),
plainRow("TR", "The track register", "track", (value) => `track ${value}`),
plainRow("SR", "The sector register", "sector", (value) => `sector ${value}`),
plainRow("DR", "The data register", "data", (value) => `${value}`),
],
},
{
heading: "Status",
registers: [
register(
"STA",
"The status register, whose bits mean different things after a seek",
8,
(s) => s.status,
(value, { commandType }) => bitLights(value, commandType > 1 ? WdTypeIIStatus : WdTypeIStatus),
),
register(
"PHASE",
"Where the controller is in the command",
8,
(s) => s.state,
(_, s) => [spelt(wdPhase(s), "What the controller is doing", WdPhases)],
),
],
},
],
drive: [
{
heading: "Drive lines",
registers: [
register(
"CTL",
"The drive control latch, as the controller sees it",
8,
(s) => s.control,
(value) => [
lit("reset", "The controller is held in reset", !(value & Control.reset)),
spelt(value & Control.density ? "FM" : "MFM", "Single density (FM) or double (MFM)", ["MFM"]),
lit("side 1", "The upper side", value & Control.side),
lit("sel 1", "Drive 1 selected", value & Control.drive1),
lit("sel 0", "Drive 0 selected", value & Control.drive0),
],
),
],
},
],
};
const WdErrorBits = {
1: [
[Status.recordNotFound, "seek error"],
[Status.crcError, "CRC error"],
],
2: [
[Status.writeProtected, "write protected"],
[Status.recordNotFound, "not found"],
[Status.crcError, "CRC error"],
[Status.typeIIorIIILostByte, "lost data"],
],
};
const wdRegisters = ({ track, sector, data }) => `tr ${track} sr ${sector} dr ${data}`;
const wdWhere = (control) =>
`${drivesNamed([control & Control.drive0, control & Control.drive1])}, side ${control & Control.side ? 1 : 0}`;
function wdCommandDetails({ byte, track, sector, data, stepRateMs }) {
const command = byte & WdCommandMask;
const commandType = wdCommandType(command);
Iif (command === WdCommand.forceInterrupt) return [];
if (commandType === 1) {
const details = command === WdCommand.seek ? [`to track ${data} from ${track}`] : [];
Eif (byte & WdCommandBits.typeIVerify) details.push("verify");
return [...details, `${stepRateMs} ms steps`];
}
Eif (commandType === 2) {
const isWrite = command === WdCommand.writeSector || command === WdCommand.writeSectorMulti;
const deleted = isWrite && byte & WdCommandBits.typeIIDeleted ? ["deleted data mark"] : [];
return [`track ${track} sector ${sector}`, ...deleted];
}
return [];
}
function wdLogLine(entry) {
switch (entry.kind) {
case "command": {
const details = wdCommandDetails(entry);
return {
text:
`${spellName(WdCommand, entry.byte & WdCommandMask)}${wdWhere(entry.control)}` +
`${details.length ? `: ${details.join(", ")}` : ""}${headOn(entry.headTrack)}`,
raw: `cmd ${hexbyte(entry.byte)} ${wdRegisters(entry)}`,
};
}
case "result": {
const errors = WdErrorBits[Math.min(entry.commandType, 2)]
.filter(([mask]) => entry.status & mask)
.map(([, text]) => text);
const deleted =
entry.commandType > 1 && entry.status & Status.typeIIorIIIDeletedMark ? ", deleted data" : "";
return {
text: `done: ${errors.length ? errors.join(", ") : "ok"}${deleted}`,
raw: `status ${hexbyte(entry.status)}`,
};
}
case "control": {
const { value } = entry;
const reset = value & Control.reset ? "" : ", held in reset";
return {
text: `control${wdWhere(value)}, ${value & Control.density ? "FM" : "MFM"}${reset}`,
raw: `wrote ${hexbyte(entry.written)}`,
};
}
case "state":
return {
text: `state: ${spellName(WdState, entry.from)} → ${spellName(WdState, entry.to)}`,
raw: wdRegisters(entry),
};
default:
return { text: entry.text };
}
}
// ---- Either ----
const HeadSection = {
heading: "Head",
registers: [
register(
"HEAD",
"The track the drive's head is over",
8,
(s) => s.head.track,
(_, { head }) => [
spelt(
`drive ${head.drive} side ${head.side} track ${head.track}`,
"The drive selected, or the last one that was, and the side and physical track under its head",
["drive 0 side 0 track 00"],
),
lit("selected", "The controller selects the drive", head.selected),
lit("spinning", "The disc is turning", head.spinning),
],
),
],
};
/** A drive's own events as log lines, for the drive toggle. */
function driveEvents(drive, driveIndex, log) {
const say = (text) => log({ kind: "drive", text: `drive ${driveIndex}: ${text}` });
return [
["startSpinning", () => say("motor on")],
["stopSpinning", () => say("motor off")],
[
"seekStart",
({ steps, stepMs }) =>
say(
`stepping ${Math.abs(steps)} ${Math.abs(steps) === 1 ? "track" : "tracks"} ${steps > 0 ? "in" : "out"}, ${stepMs} ms a step`,
),
],
["seekEnd", () => say(`head on track ${drive.logicalTrack}`)],
["headStop", () => say(`head against its stop at track ${drive.logicalTrack}`)],
].map(([type, listener]) => ({ drive, type, listener }));
}
/**
* A floating panel showing the disc controller, the 8271 or the 1770, decoded: its command and parameters, where it
* is in the command, its status and result, the drive lines and the head. It logs the controller's commands, its state
* changes and the drives' events while each is switched on, and the controller's warnings always.
*/
export class FdcPanel {
/**
* @param {object} options
* @param {import("../6502.js").Cpu6502} options.cpu
* @param {import("./floating-panel.js").PanelArrangement} options.arrangement
* @param {{zoomToHead: (driveIndex: number) => void}} options.visualiser
* @param {(() => Storage) | null} options.storage - where the log's switches are kept between visits, or null
*/
constructor({ cpu, arrangement, visualiser, storage }) {
this._fdc = cpu.fdc;
this._storage = storage;
const { floating, body, part } = decodedPanel({
id: "fdc",
title: "Disc controller",
feature: "disc_controller",
place: () => ({ x: Centred, y: StartEdge }),
minSize: MinPanelSize,
arrangement,
draw: () => this.update(),
});
this.floating = floating;
body.innerHTML = `
<div class="fdc-registers"></div>
<div>
<div class="fdc-drive"></div>
<button type="button" class="txt-btn fdc-zoom" tabindex="-1"
title="Open the disc surface on this side, zoomed in on the head">show the head on the disc</button>
</div>
<div class="fdc-log-area">
<div class="decoded-heading fdc-log-heading">
Log
<button type="button" class="decoded-bit fdc-log-commands" tabindex="-1"
title="Log each command the controller is given, with its parameters and result">commands</button>
<button type="button" class="decoded-bit fdc-log-states" tabindex="-1"
title="Log each change of the controller's state; there are a great many">state changes</button>
<button type="button" class="decoded-bit fdc-log-drives" tabindex="-1"
title="Log the drives' motors starting and stopping, and their heads stepping">drives</button>
<input type="text" class="form-control form-control-sm panel-field fdc-log-filter"
aria-label="Show only the lines containing this" placeholder="filter" />
<button type="button" class="txt-btn fdc-log-copy" tabindex="-1"
title="Copy the lines shown to the clipboard">copy</button>
<button type="button" class="txt-btn fdc-log-clear" tabindex="-1">clear</button>
</div>
<div class="fdc-log"></div>
</div>`;
const { chip } = this._fdc.inspect();
const sections = chip === "8271" ? IntelSections : WdSections;
this._logLine = chip === "8271" ? intelLogLine : wdLogLine;
const [commandSection, ...otherSections] = sections.command;
this._registers = [
new DecodedRegisters(part("fdc-registers"), [
{ ...commandSection, heading: `${chip} command` },
...otherSections,
]),
new DecodedRegisters(part("fdc-drive"), [...sections.drive, HeadSection]),
];
part("fdc-zoom").addEventListener("click", () => visualiser.zoomToHead(this._fdc.inspect().lastSelectedDrive));
this._log = part("fdc-log");
this._followingLog = true;
this._followedTo = 0;
this._log.addEventListener("scroll", () => {
const log = this._log;
// Lines may have come between following them and this event, so only a scroll back up stops following.
this._followingLog =
log.scrollTop >= this._followedTo || log.scrollTop + log.clientHeight >= log.scrollHeight - 1;
});
this._fdc.onLog = (entry) => this._appendLog(entry);
this._driveListeners = this._fdc.drives.flatMap((drive, index) =>
driveEvents(drive, index, (entry) => this._appendLog(entry)),
);
this._loggingDrives = false;
this._logToggles = [
{
name: "commands",
button: part("fdc-log-commands"),
isOn: () => this._fdc.logCommands,
set: (on) => (this._fdc.logCommands = on),
},
{
name: "states",
button: part("fdc-log-states"),
isOn: () => this._fdc.logStateChanges,
set: (on) => (this._fdc.logStateChanges = on),
},
{
name: "drives",
button: part("fdc-log-drives"),
isOn: () => this._loggingDrives,
set: (on) => this._logDrives(on),
},
];
for (const toggle of this._logToggles)
toggle.button.addEventListener("click", () => {
toggle.set(!toggle.isOn());
this._showLogging();
this._saveLogging();
});
this._filter = "";
const filter = part("fdc-log-filter");
filter.addEventListener("input", () => {
this._filter = filter.value.toLowerCase();
for (const line of this._log.children) line.hidden = !this._shows(line);
});
filter.addEventListener("keydown", (event) => {
Eif (event.key === "Escape") {
filter.value = "";
filter.dispatchEvent(new Event("input"));
}
Iif (event.key === "Enter") filter.blur();
});
const copy = part("fdc-log-copy");
// The clipboard is only there on a secure origin.
copy.hidden = !navigator.clipboard;
copy.addEventListener("click", () => this._copyLog());
part("fdc-log-clear").addEventListener("click", () => this._log.replaceChildren());
this._restoreLogging();
this._showLogging();
this.update();
}
_logDrives(on) {
if (on === this._loggingDrives) return;
this._loggingDrives = on;
for (const { drive, type, listener } of this._driveListeners) {
if (on) drive.addEventListener(type, listener);
else drive.removeEventListener(type, listener);
}
}
_showLogging() {
for (const { button, isOn } of this._logToggles) {
button.classList.toggle("lit", isOn());
button.setAttribute("aria-pressed", String(isOn()));
}
}
_restoreLogging() {
if (!this._storage) return;
const saved = readStored(this._storage, LogStorageKey, "the disc controller's log switches");
for (const { name, set } of this._logToggles) set(saved?.[name] === true);
}
_saveLogging() {
const saved = Object.fromEntries(this._logToggles.map(({ name, isOn }) => [name, isOn()]));
writeStored(this._storage, LogStorageKey, saved, "the disc controller's log switches");
}
_shows(line) {
return !this._filter || line.textContent.toLowerCase().includes(this._filter);
}
/** @param {import("../fdc.js").FdcLogEntry | {kind: "drive", text: string}} entry */
_appendLog(entry) {
const { text, raw } = this._logLine(entry);
const isWarning = entry.kind === "warning";
const line = document.createElement("div");
line.textContent = isWarning ? `warning: ${text}` : text;
if (raw) {
const rawPart = document.createElement("span");
rawPart.className = "fdc-log-raw";
rawPart.textContent = raw;
line.append(" ", rawPart);
}
// console.log(line.textContent);
line.classList.toggle("fdc-log-warning", isWarning);
line.hidden = !this._shows(line);
this._log.append(line);
Iif (this._log.childElementCount > MaxLogLines) this._log.firstElementChild.remove();
}
_copyLog() {
const shown = [...this._log.children].filter((line) => !line.hidden).map((line) => line.textContent);
navigator.clipboard
.writeText(shown.join("\n"))
.catch((error) => console.warn(`Could not copy the disc controller's log: ${error}`));
}
update() {
const state = this._fdc.inspect();
const drive = this._fdc.drives[state.lastSelectedDrive];
state.head = {
drive: state.lastSelectedDrive,
selected: state.selectedDrive !== null,
side: drive.isSideUpper ? 1 : 0,
track: drive.track,
spinning: drive.spinning,
};
for (const registers of this._registers) registers.update(state);
// Scrolled here, once a frame, rather than as each line comes, which would lay the page out for every one.
Eif (this._followingLog) {
this._log.scrollTop = this._log.scrollHeight;
this._followedTo = this._log.scrollTop;
}
}
}
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