Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 | 3x 3x 3x 3x 3x 3x 3x 3x 273x 273x 3x 273x 196x 196x 3x 12x 3x 92x 49x 49x 49x 49x 43x 43x 49x 3x 49x 3x 1455x 20x 20x 20x 20x 20x 20x 20x 260x 260x 260x 260x 20x 20x 20x 160x 160x 160x 160x 160x 2080x 2080x 2080x 2080x 2080x 20x 49x 49x 49x 637x 49x 5096x 5096x 49x 49x 3x 20x 20x 18x 20x 20x 20x 20x 20x 49x 98x 49x | import { hexword } from "../hex.js";
import { BBC } from "../keymap.js";
import { HwScrollSubtract } from "../video.js";
import { setText } from "./dom-utils.js";
import { decodedPanel, DecodedRegisters, fixed, lit, register, spelt, widest } from "./decoded-registers.js";
import { Centred, StartEdge } from "./panel-layout.js";
import { controlSection, portsSection, TimersSection, viaState } from "./via-registers.js";
// The keypad's columns, 10 to 12, are scanned on a B as well, and the host's keypad reaches them.
const MatrixColumns = 13;
const MatrixRows = 8;
const MinPanelSize = { w: 240, h: 120 };
const StatusForms = ["Autoscan: column 15, no keys", "Port A: column 15, row 7"];
const ScreenEnd = 0x8000;
const HwScrollUnit = 0x800;
/** @type {import("./via-registers.js").ViaWiring} */
const Wiring = {
ca1: { name: "CA1", wiring: "vsync", title: "the 6845's vertical sync" },
ca2: {
name: "CA2",
wiring: "keyboard",
title: "the keyboard: a key held as the autoscan passes it, or the key port A selects",
},
cb1: { name: "CB1", wiring: "ADC", title: "the analogue to digital converter's end of conversion" },
cb2: { name: "CB2", wiring: "light pen", title: "the 6845's light pen strobe" },
t1: "Timer 1 has reached zero; the OS runs it at 100 Hz",
};
const KeyLabels = {
SEMICOLON_PLUS: ";",
MINUS: "-",
LEFT_SQUARE_BRACKET: "[",
RIGHT_SQUARE_BRACKET: "]",
COMMA: ",",
PERIOD: ".",
SLASH: "/",
SHIFTLOCK: "SLk",
TAB: "Tab",
RETURN: "Ret",
DELETE: "Del",
COPY: "Cpy",
SHIFT: "Shf",
ESCAPE: "Esc",
CTRL: "Ctl",
CAPSLOCK: "CLk",
LEFT: "←",
UP: "↑",
RIGHT: "→",
DOWN: "↓",
SPACE: "Spc",
UNDERSCORE_POUND: "_",
AT: "@",
COLON_STAR: ":",
PIPE_BACKSLASH: "\\",
HAT_TILDE: "^",
NUMPADPLUS: "k+",
NUMPADMINUS: "k-",
NUMPADSLASH: "k/",
NUMPADASTERISK: "k*",
NUMPADHASH: "k#",
NUMPAD_DELETE: "kDl",
NUMPADCOMMA: "k,",
NUMPAD_DECIMAL_POINT: "k.",
NUMPADENTER: "kRt",
};
function keyLabel(name) {
return KeyLabels[name] ?? name.replace(/^K(\d)$/, "$1").replace(/^NUMPAD(\d)$/, "k$1");
}
function keyTitle(name) {
return name
.replace(/^K(\d)$/, "$1")
.replace(/^NUMPAD_?/, "keypad ")
.replaceAll("_", " ")
.toLowerCase();
}
/** The BBC key at each place in the matrix, by `column,row`. */
const KeysByPlace = new Map(
Object.entries(BBC).map(([name, [column, row]]) => [
`${column},${row}`,
{ label: keyLabel(name), title: keyTitle(name) },
]),
);
/** A line the B and Master wire differently, in a slot that fits either, so the panel lays out alike on both. */
function wiredAs(isMaster, [bText, bTitle, onB], [masterText, masterTitle, onMaster]) {
const width = widest([bText, masterText]);
return isMaster
? { text: masterText, title: masterTitle, lit: !!onMaster, width }
: { text: bText, title: bTitle, lit: !!onB, width };
}
const KeyboardModes = ["keys: autoscan", "keys: port A"];
const ScreenSizes = HwScrollSubtract.map((subtract) => `screen ${(subtract * HwScrollUnit) / 1024}K`);
const KeySelections = ["column 15, row 7"];
function keyboardSelection(portA) {
return { column: portA & 0xf, row: (portA >>> 4) & 7 };
}
function decodeIc32(ic32, { isMaster }) {
const scroll = (ic32 >>> 4) & 3;
const wrapTo = ScreenEnd - HwScrollSubtract[scroll] * HwScrollUnit;
return [
lit("sound write", "B0, active low: the sound chip takes the slow data bus", !(ic32 & 1)),
wiredAs(
isMaster,
["speech read", "B1, active low: the speech processor's read select", !(ic32 & 2)],
["RTC read", "B1: the real-time clock's read/write line, high to read", ic32 & 2],
),
wiredAs(
isMaster,
["speech write", "B2, active low: the speech processor's write select", !(ic32 & 4)],
["RTC data", "B2: the real-time clock's data strobe", ic32 & 4],
),
spelt(
KeyboardModes[ic32 & 8 ? 0 : 1],
"B3, the keyboard's write enable: high, the keyboard scans itself and raises CA2 for a key held; " +
"low, port A reads the key it selects",
KeyboardModes,
),
spelt(
ScreenSizes[scroll],
`B4 and B5 (C0 and C1): the hardware scroll wraps screen addresses at &${hexword(ScreenEnd)} ` +
`back to &${hexword(wrapTo)}`,
ScreenSizes,
),
lit("caps lock", "B6, active low: the caps lock light", !(ic32 & 0x40)),
lit("shift lock", "B7, active low: the shift lock light", !(ic32 & 0x80)),
];
}
function decodePortA(pins, { ic32 }) {
if (ic32 & 8) return [];
const { column, row } = keyboardSelection(pins);
return [
spelt(
`column ${column}, row ${row}`,
"PA0-PA3 and PA4-PA6: the key the keyboard is asked about",
KeySelections,
),
lit("key down", "PA7: the keyboard pulls it low unless the selected key is held", pins & 0x80),
];
}
function decodePortB(pins, { isMaster }) {
return [
fixed(
`latch B${pins & 7} = ${(pins >>> 3) & 1}`,
"PB0-PB2 address an IC32 latch bit and PB3 is the level written to it",
),
lit("fire 1", "PB4, active low: joystick 1's fire button", !(pins & 0x10)),
lit("fire 2", "PB5, active low: joystick 2's fire button", !(pins & 0x20)),
wiredAs(
isMaster,
["speech ready", "PB6, active low: the speech processor is ready", !(pins & 0x40)],
["RTC enable", "PB6: the real-time clock's chip enable", pins & 0x40],
),
wiredAs(
isMaster,
["speech IRQ", "PB7, active low: the speech processor's interrupt", !(pins & 0x80)],
["RTC address", "PB7: the real-time clock's address strobe", pins & 0x80],
),
];
}
const Ic32Section = {
heading: "IC32 latch",
registers: [register("IC32", "The addressable latch port B writes", 8, (s) => s.ic32, decodeIc32)],
};
const Sections = {
ports: portsSection({
a: { title: "Port A's lines: the slow data bus", decode: decodePortA },
b: { title: "Port B's lines", decode: decodePortB },
}),
control: controlSection(Wiring),
};
/**
* The system VIA and its keyboard as the panel shows them; see viaState.
* @param {import("../via.js").SysVia} via
*/
export function sysViaState(via) {
return {
...viaState(via),
ic32: via.IC32,
isMaster: !!via.isMaster,
keys: via.keys,
scanColumn: via.scanColumn(),
};
}
/** The keyboard's matrix of keys, with those held and the column being scanned or read marked. */
class KeyMatrix {
constructor(container, status) {
this._status = status;
status.style.width = `${widest(StatusForms)}ch`;
const table = document.createElement("table");
const header = table.createTHead().insertRow();
header.append(document.createElement("th"));
this._headers = [];
for (let column = 0; column < MatrixColumns; ++column) {
const th = document.createElement("th");
th.textContent = String(column);
header.append(th);
this._headers.push(th);
}
const body = table.createTBody();
this._cells = [];
for (let row = 0; row < MatrixRows; ++row) {
const tr = body.insertRow();
const th = document.createElement("th");
th.textContent = String(row);
tr.append(th);
for (let column = 0; column < MatrixColumns; ++column) {
const cell = tr.insertCell();
const key = KeysByPlace.get(`${column},${row}`);
cell.textContent = key?.label ?? "";
cell.title = `${key ? `${key.title}: ` : ""}column ${column}, row ${row}`;
this._cells.push({ cell, column, row });
}
}
container.replaceChildren(table);
}
update({ keys, ic32, portA, scanColumn }) {
const autoscan = !!(ic32 & 8);
const selected = keyboardSelection(portA);
const column = autoscan ? scanColumn : selected.column;
for (const [index, header] of this._headers.entries()) header.classList.toggle("scanned", index === column);
for (const { cell, column: c, row } of this._cells) {
cell.classList.toggle("held", !!keys[c][row]);
cell.classList.toggle("selected", !autoscan && c === selected.column && row === selected.row);
}
const status = autoscan
? `Autoscan: column ${scanColumn}${scanColumn >= MatrixColumns ? ", no keys" : ""}`
: `Port A: column ${selected.column}, row ${selected.row}`;
setText(this._status, status);
}
}
/**
* A floating panel showing the system VIA decoded, with the keyboard matrix beside it, read once a frame while it is
* open and the machine runs, and not at all while it is closed.
*/
export class SysViaPanel {
/** Whether the machine has a system VIA to show: the Atom's CPU carries one it never wires up. */
static fits(cpu) {
return !cpu.model.isAtom;
}
/**
* @param {object} options
* @param {import("../6502.js").Cpu6502} options.cpu
* @param {import("./floating-panel.js").PanelArrangement} options.arrangement
*/
constructor({ cpu, arrangement }) {
this._via = cpu.sysvia;
const { floating, body, part } = decodedPanel({
id: "sysvia",
title: "System VIA",
feature: "system_via",
place: () => ({ x: Centred, y: StartEdge }),
minSize: MinPanelSize,
arrangement,
draw: () => this.update(),
});
this.floating = floating;
body.innerHTML = `
<div class="sysvia-ports"></div>
<div>
<div class="decoded-heading">Keyboard</div>
<div class="key-matrix"></div>
<div class="key-matrix-status"></div>
<div class="sysvia-latch"></div>
</div>`;
// The keyboard matrix heads the second column, which is why the sections are split as they are.
this._registers = [
new DecodedRegisters(part("sysvia-ports"), [Sections.ports, Sections.control]),
new DecodedRegisters(part("sysvia-latch"), [Ic32Section, TimersSection]),
];
this._matrix = new KeyMatrix(part("key-matrix"), part("key-matrix-status"));
this.update();
}
update() {
const state = sysViaState(this._via);
for (const registers of this._registers) registers.update(state);
this._matrix.update(state);
}
}
|