117 lines
2.6 KiB
TypeScript
117 lines
2.6 KiB
TypeScript
import ROM from 'js/roms/rom';
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import { bit, byte } from 'js/types';
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import { debug } from '../util';
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const PATTERN = [
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0xC5, 0x3A, 0xA3, 0x5C, 0xC5, 0x3A, 0xA3, 0x5C
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];
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const A0 = 0x01;
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const A2 = 0x04;
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export default class NoSlotClock {
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bits: bit[] = [];
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pattern = new Array(64);
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patternIdx: number = 0;
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constructor(private rom: ROM) {
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debug('NoSlotClock');
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}
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private patternMatch() {
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for (let idx = 0; idx < 8; idx++) {
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let byte = 0;
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for (let jdx = 0; jdx < 8; jdx++) {
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byte >>= 1;
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byte |= this.pattern.shift() ? 0x80 : 0x00;
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}
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if (byte !== PATTERN[idx]) {
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return false;
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}
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}
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return true;
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}
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private calcBits() {
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const shift = (val: byte) => {
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for (let idx = 0; idx < 4; idx++) {
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this.bits.push(val & 0x08 ? 0x01 : 0x00);
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val <<= 1;
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}
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};
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const shiftBCD = (val: byte) => {
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shift(Math.floor(val / 10));
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shift(Math.floor(val % 10));
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};
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const now = new Date();
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const year = now.getFullYear() % 100;
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const day = now.getDate();
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const weekday = now.getDay() + 1;
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const month = now.getMonth() + 1;
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const hour = now.getHours();
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const minutes = now.getMinutes();
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const seconds = now.getSeconds();
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const hundredths = (now.getMilliseconds() / 10);
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this.bits = [];
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shiftBCD(year);
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shiftBCD(month);
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shiftBCD(day);
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shiftBCD(weekday);
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shiftBCD(hour);
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shiftBCD(minutes);
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shiftBCD(seconds);
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shiftBCD(hundredths);
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}
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access(off: byte) {
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if (off & A2) {
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this.patternIdx = 0;
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} else {
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const bit = off & A0;
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this.pattern[this.patternIdx++] = bit;
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if (this.patternIdx === 64) {
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if (this.patternMatch()) {
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this.calcBits();
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}
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this.patternIdx = 0;
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}
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}
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}
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start() {
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return this.rom.start();
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}
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end() {
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return this.rom.end();
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}
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read(page: byte, off: byte) {
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if (this.bits.length > 0) {
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const bit = this.bits.pop();
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return bit;
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} else {
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this.access(off);
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}
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return this.rom.read(page, off);
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}
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write(_page: byte, off: byte, _val: byte) {
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this.access(off);
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this.rom.write();
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}
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getState() {
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return {};
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}
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setState(_: unknown) {
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// Setting the state makes no sense.
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}
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}
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